Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 31, Issue 2, 19 January 1995
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Volume 31, Issue 2
19 January 1995
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- Author(s): M. Høvin ; A. Olsen ; T.S. Lande ; C. Toumazou
- Source: Electronics Letters, Volume 31, Issue 2, p. 81 –82
- DOI: 10.1049/el:19950093
- Type: Article
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–82
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A novel second-order cascaded Δ-Σ modulator concept is presented. The first integrator is extracted, and implemented by an FM oscillator. The result is a simple, extended multibit Δ-Σ modulator with no component matching restrictions, and a high sampling frequency potential. Without the oscillator, the modulator becomes a second-order Δ-Σ F/D converter.
Novel second-order Δ-Σ modulator/frequency-to-digital converter
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- Author(s): Y.-W. Leung
- Source: Electronics Letters, Volume 31, Issue 2, p. 82 –83
- DOI: 10.1049/el:19950090
- Type: Article
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Two enhancements are proposed for multicopy ALOHA. First, a probabilistic transmission policy is proposed to relax the constraint of an integral number of copies. Secondly, artificial power capture is introduced to multicopy ALOHA. The numerical results show that generalised multicopy ALOHA can significantly increase the throughput when the traffic is heavy. - Author(s): V. Delport and M. Koschorreck
- Source: Electronics Letters, Volume 31, Issue 2, p. 84 –85
- DOI: 10.1049/el:19950081
- Type: Article
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A genetic algorithm (GA) as a modern search/optimisation technique is introduced to codebook design in vector quantisation. It is examined for the vector space of DCT coefficients and compared with the fuzzy-c-mean (FCM) and the LBG algorithm. - Author(s): YimingMao and ZhenghuaYu
- Source: Electronics Letters, Volume 31, Issue 2, p. 85 –86
- DOI: 10.1049/el:19950043
- Type: Article
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When DCT-I is used for interpolation, errors occur due to the implied zero conditions of boundary points. By adding simple functions to the input sequence to satisfy the conditions, the accuracy may be improved. - Author(s): P. Jung
- Source: Electronics Letters, Volume 31, Issue 2, p. 86 –87
- DOI: 10.1049/el:19950069
- Type: Article
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In the Letter a novel low complexity decoder for turbo-codes is proposed. Its performance in the case of AWGN channels and fully interleaved Rayleigh fading channels achieved with a new turbo-code using eight state component codes is compared to that of previous decoders. - Author(s): K. Crisler and M. Needham
- Source: Electronics Letters, Volume 31, Issue 2, p. 87 –89
- DOI: 10.1049/el:19950092
- Type: Article
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The theoretical relationship between throughput S and offered load G of reservation ALOHA (R-ALOHA) is derived. Closed-form expressions are given. It is shown that the performance of one version of R-ALOHA is mathematically equivalent to that of carrier sense multiple access with collision detection (CSMA/CD) under special circumstances.
Generalised multicopy ALOHA
Genetic algorithm for codebook design in vector quantisation
Interpolation using the type I discrete cosine transform with greatly increased accuracy
Novel low complexity decoder for turbo-codes
Throughput analysis of reservation ALOHA multiple access
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- Author(s): J.T. Mowchenko and M.Y.-M. Pong
- Source: Electronics Letters, Volume 31, Issue 2, p. 89 –90
- DOI: 10.1049/el:19950095
- Type: Article
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A new circuit style for implementing synchronous circuits in logic arrays is presented. The new style is a combination of dynamic and ratioed logic styles. Compared with existing logic arrays, the new style has a smaller layout area, competitive time performance, and lower power dissipation and switching currents.
Clocked ratioed logic for implementing synchronous circuits in logic arrays
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- Author(s): Yong KyuKim ; Hyoung GonKim ; Kyu TaePark
- Source: Electronics Letters, Volume 31, Issue 2, p. 90 –92
- DOI: 10.1049/el:19950059
- Type: Article
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The proposed tree structure for image coding exploits the similarity between hierarchical bands of the wavelet transform. Each node has a height attribute and the tree structure is represented as a conditional height difference to remove the statistical dependency between hierarchical nodes. For the 512 × 512 Lena image, the result shows above 40 dB at 1 bit/pixel. - Author(s): D.G. Sampson ; E.A.B. da Silva ; M. Ghanbari
- Source: Electronics Letters, Volume 31, Issue 2, p. 92 –93
- DOI: 10.1049/el:19950057
- Type: Article
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A new method for low bit rate video coding based on overlapped block matching and successive approximation wavelet vector quantisation is described. The main advantage of this scheme is that the most important data of the motion compensated interframe prediction error image are coded prioritarily, resulting in excellent coding performance. Simulation results show that at 64 kbit/s, the proposed method outpertorms the RM8 implementation of H.261 by 2–3 dB.
New tree structure with conditional height difference for wavelet transform image coding
Wavelet vector quantisation scheme for image sequence coding at 64 kbit/s
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- Author(s): J. He and E. Dawson
- Source: Electronics Letters, Volume 31, Issue 2, p. 93 –95
- DOI: 10.1049/el:19950073
- Type: Article
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The authors propose a multisecret-sharing scheme. In such a scheme, many secrets are shared in such a way that all secrets can be reconstructed independently. Each share is of the same size as that of any single shared secret. This is an improvement on a previously proposed multistage secret-sharing scheme.
Multisecret-sharing scheme based on one-way function
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- Author(s): G.D. Maxwell and B.J. Ainslie
- Source: Electronics Letters, Volume 31, Issue 2, p. 95 –96
- DOI: 10.1049/el:19950071
- Type: Article
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–96
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The authors report, for the first time, the demonstration of a UV directly written directional coupler in a planar silica waveguide on silicon. From the device parameters and the measured spectral characteristics, the UV-induced index change is calculated to be 0.0075. This is the highest photoinduced refractive index change reported to date in a planar silica waveguide. - Author(s): K. Kawano ; S. Sekine ; H. Takeuchi ; M. Wada ; M. Kohtoku ; N. Yoshimoto ; T. Ito ; M. Yanagibashi ; S. Kondo ; Y. Noguchi
- Source: Electronics Letters, Volume 31, Issue 2, p. 96 –97
- DOI: 10.1049/el:19950074
- Type: Article
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4×4 InGaAlAs/InAlAs MQW directional coupler waveguide switch modules integrated with spot-size converters are developed for the first time. Because the switching time is sufficiently short (< 70 ps, which is limited by the driver speed), no bits are lost during a 10 Gbit/s switching experiment at 1.55 µm wavelength. - Author(s): H.C. Neitzert ; C. Cacciatore ; D. Campi ; C. Rigo
- Source: Electronics Letters, Volume 31, Issue 2, p. 97 –99
- DOI: 10.1049/el:19950061
- Type: Article
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–99
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The authors report the room temperature operation of an InGaAs/InP based Wannier-Stark modulator in a waveguide configuration as a self-electro-optic effect device for the generation of various nonlinear optical transfer functions for TE polarised light at 1.55 µm. Optical bistability has been achieved and the application of the device as an optical power discriminator is demonstrated.
Demonstration of a directly written directional coupler using UV-induced photosensitivity in a planar silica waveguide
4×4 InGaAlAs/InAlAs MQW directional coupler waveguide switch modules integrated with spot-size converters and their 10 Gbit/s operation
Self-electro-optic effect device in waveguiding configuration as optical switch and power discriminator
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- Author(s): J. Bonar ; J.A. Bebbington ; J.S. Aitchison ; G.D. Maxwell ; B.J. Ainslie
- Source: Electronics Letters, Volume 31, Issue 2, p. 99 –100
- DOI: 10.1049/el:19950086
- Type: Article
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–100
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Aerosol doped neodymium planar silica waveguide lasers on silicon are reported for the first time. The waveguide lasers were fabricated by a combination of flame hydrolysis deposition (FHD) and reactive ion etching (RIE). A threshold of 22 mW and a slope efficiency of 2.5% were achieved. - Author(s): A. Toda ; D. Imanishi ; T. Kawasumi ; A. Ishibashi
- Source: Electronics Letters, Volume 31, Issue 2, p. 101 –102
- DOI: 10.1049/el:19950065
- Type: Article
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–102
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An internal loss of 4.6 cm-1 is estimated from the cavity length dependence of photopumped blue lasing at room temperature (RT) with a ZnSe/ZnMgSSe double-heterostructure (DH) grown by metal organic chemical vapour deposition (MOCVD). The low internal loss, being comparable to that of molecular beam epitaxy (MBE)-grown DH, implies the feasibility of realising an MOCVD-grown DH device. - Author(s): Y. Qian ; Z.T. Xu ; J.M. Zhang ; L.H. Chen ; Q.M. Wang ; L.X. Zheng ; X.W. Hu
- Source: Electronics Letters, Volume 31, Issue 2, p. 102 –104
- DOI: 10.1049/el:19950055
- Type: Article
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–104
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GaAs/AlGaAs two-dimensional quantum-well wire laser arrays fabricated by metal-organic chemical vapour deposition on nonplanar substrates have realised a linear light pulse output power of over 100 mW. This is the highest figure reported to date for all kinds of quantum-well wire lasers. - Author(s): N. Yokouchi ; N. Yamanaka ; N. Iwai ; A. Kasukawa
- Source: Electronics Letters, Volume 31, Issue 2, p. 104 –105
- DOI: 10.1049/el:19950054
- Type: Article
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–105
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1.3 µm Ga0.49In0.51As0.7P0.3 –1.15% tensile strained single quantum well (SQW) lasers are successfully fabricated. The lowest threshold current for a 200 µm-long, 20 µm-wide ridge waveguide laser with high reflectivity coating is as low as 6 mA, corresponding to a very low threshold current density of 150 A/cm2. - Author(s): S. O'Brien ; W. Plano ; J. Major ; D.F. Welch ; T. Tally
- Source: Electronics Letters, Volume 31, Issue 2, p. 105 –106
- DOI: 10.1049/el:19950062
- Type: Article
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–106
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Laser bars 1 cm long operating at a wavelength of 1.94 µm have been fabricated using strained quantum wells in the InGaAsP material system lattice-matched to InP. At pulse lengths of 0.5 ms with a 5% duty cycle the laser bars demonstrated record-level peak optical powers greater than 27 W at a wavelength of 1.94 µm. Pulses up to 5 ms in duration were demonstrated with pulse energies approaching 90 mJ. - Author(s): H. Jeon ; V. Kozlov ; P. Kelkar ; A.V. Nurmikko ; D.C. Grillo ; J. Han ; M. Ringle ; R.L. Gunshor
- Source: Electronics Letters, Volume 31, Issue 2, p. 106 –108
- DOI: 10.1049/el:19950075
- Type: Article
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–108
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Optically pumped vertical cavity laser operation up to T = 260 K has been achieved in the 480–500 nm-wavelength range in ZnCdSe/ZnSSe/ZnMgSSe pseudomorphic separate confinement heterostructures, containing three active quantum well layers and dielectric high reflectivity mirrors. - Author(s): T.K. Sudoh ; M. Funabashi ; Y. Nakano ; K. Tada ; T. Hirata
- Source: Electronics Letters, Volume 31, Issue 2, p. 108 –109
- DOI: 10.1049/el:19950067
- Type: Article
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p.
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–109
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The instantaneous wavelength shift in gain-switched short optical pulses from absorptive-grating gain-coupled distributed feedback semiconductor lasers showed unusual behaviour which resulted in much smaller chirping than that in conventional lasers. Measurements of spontaneous emission from the absorptive grating layer indicate carrier accumulation in that layer. The origin of the low chirping has been attributed to the fact that the index increase due to carrier depletion in the active layer is compensated for by an index decrease due to carrier accumulation in the grating layer. - Author(s): H. Kawaguchi ; I.S. Hidayat ; Y. Takahashi ; Y. Yamayoshi
- Source: Electronics Letters, Volume 31, Issue 2, p. 109 –111
- DOI: 10.1049/el:19950060
- Type: Article
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Pitchfork bifurcation polarisation bistability has been observed experimentally in a vertical-cavity surface-emitting laser for the first time. All-optical flipflop operation has been successfully demonstrated by injecting the trigger light inputs having the two orthogonal polarisations. - Author(s): D.A.O. Davies ; A.D. Ellis ; T. Widdowson ; G. Sherlock
- Source: Electronics Letters, Volume 31, Issue 2, p. 111 –112
- DOI: 10.1049/el:19950058
- Type: Article
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–112
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Error-free optical modulation of a regular stream of data pulses at 10 GHz by optical data at 10 Gbit/s is demonstrated using a semiconductor laser amplifier within a loop mirror. This is achieved without patterning despite an amplifier recovery time of several bit periods by positioning the amplifier near to the centre of the loop. This approach removes sensitivity to the optical polarisation of incoming data.
Aerosol doped Nd planar silica waveguide laser
Cavity length dependence of photopumped lasing properties of MOCVD-grown ZnSe/ZnMgSSe double-heterostructure
High-power two-dimensional quantum wire laser arrays
Low threshold 1.3 µm-GaInAsP/InP tensile strained single quantum well lasers grown by low-pressure MOCVD
Operation of strained-layer diode laser bars at 1.94 µm to 27 W QCW
Optically pumped blue-green vertical cavity surface emitting lasers
Origin of low dynamic wavelength chirp in short optical pulses from absorptive-grating gain-coupled distributed feedback semiconductor lasers
Pitchfork bifurcation polarisation bistability in vertical-cavity surface-emitting lasers
10 Gbit/s data switched semiconductor laser amplifier nonlinear loop mirror
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- Author(s): P.G. Dinesen ; A. Bjarklev ; T. Rasmussen ; C. Lester
- Source: Electronics Letters, Volume 31, Issue 2, p. 112 –114
- DOI: 10.1049/el:19950056
- Type: Article
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–114
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Employing accurate numerical methods, the optical and microwave characteristics of a polymer-based electro-optic modulator are determined. It is shown that there are two independent design parameters for obtaining velocity matching and minimising the conductor loss, respectively. Bandwidth considerations indicate that the available power will be bandwidth-limiting.
Microwave properties of a travelling-wave modulator in polymers employing a microwave buffer layer for velocity matching
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- Author(s): M. Arai ; J.G.P. Binner ; T.E. Cross
- Source: Electronics Letters, Volume 31, Issue 2, p. 114 –115
- DOI: 10.1049/el:19950078
- Type: Article
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–115
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Microwave complex permittivity of PTFE (Teflon®) was measured using a transmission/reflection (TR) method and a coaxial sample fixture. A range of sample dimensions were prepared in order to examine the effect of airgaps on the measured permittivities. The measurements were compared with calculated values using a formula derived by considering the total capacitance. - Author(s): M. Arai ; J.G.P. Binner ; T.E. Cross
- Source: Electronics Letters, Volume 31, Issue 2, p. 115 –117
- DOI: 10.1049/el:19950077
- Type: Article
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Complex permittivities of PTFE (Teflon®), alumina (Al2O3) and zirconia (ZrO2) were measured at microwave frequencies using an open-ended coaxial line probe as a function of average surface roughness Ra. Estimates were made and compared with the measurements.
Correction of errors due to airgaps for microwave complex permittivity measurement using a coaxial line
Estimating errors due to sample surface roughness in microwave complex permittivity measurements obtained using a coaxial probe
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- Author(s): S. Chen
- Source: Electronics Letters, Volume 31, Issue 2, p. 117 –118
- DOI: 10.1049/el:19950085
- Type: Article
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p.
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–118
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An improved clustering and recursive least squares (RLS) learning algorithm for Gaussian radial basis function (RBF) networks is described for modelling and predicting nonlinear time series. Significant performance gain can be achieved with a much smaller network compared with the usual clustering and RLS method.
Nonlinear time series modelling and prediction using Gaussian RBF networks with enhanced clustering and RLS learning
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- Author(s): J.U. Kang ; G.I. Stegeman ; J.S. Aitchison
- Source: Electronics Letters, Volume 31, Issue 2, p. 118 –119
- DOI: 10.1049/el:19950094
- Type: Article
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The authors demonstrate multiplexing of femtosecond signals without the usual 3 dB loss of conventional passive multiplexers using an AlGaAs nonlinear directional coupler controlled by strong pump pulses. - Author(s): Y. Jaouën ; M. Djadel ; C. Chabran
- Source: Electronics Letters, Volume 31, Issue 2, p. 119 –121
- DOI: 10.1049/el:19950079
- Type: Article
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–121
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The performance of coherent optical communication systems is significantly degraded by semiconductor laser phase noise. A rate 1/2, constraint length K = 7, convolutional error correcting code with Viterbi decoding is used to improve a 3.5–10 Mbit/s DPSK system. Error correcting coding demonstrates the reduction of the influence of phase noise on BER performance, and significantly lowers the BER floor. Soft decision decoding and hard decision decoding performance is investigated and compared. - Author(s): G.Y. Lyu and C.S. Park
- Source: Electronics Letters, Volume 31, Issue 2, p. 121 –122
- DOI: 10.1049/el:19950083
- Type: Article
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A 4-channel frequency locking system has been demonstrated using a fibre-fed Fabry-Perot (FFP) filter with a free spectral range (FSR) of 100 GHz. A back-reflection curve from the FFP was used for the extraction of an error signal in such a way as to overcome the limitation in the number of accommodatable channels due to the saturation in a photodetector. The frequency stability and locking range of each channel were within 15 MHz and over 12 GHz, respectively. - Author(s): Y.-C. Lu ; J. Cheng ; P. Zhou ; J. Klem ; J.C. Zolper
- Source: Electronics Letters, Volume 31, Issue 2, p. 122 –124
- DOI: 10.1049/el:19950089
- Type: Article
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The authors describe the design and the high frequency modulation characteristics of a monolithic optoelectronic switch integrating a vertical-cavity surface-emitting laser with a GaAs heterojunction bipolar transistor. Large-signal electrical-to-optical modulation at a data rate of > 500 Mbit/s, and small-signal modulation with a 4 GHz bandwidth have been demonstrated. - Author(s): T. Morioka ; S. Kawanishi ; H. Takara ; O. Kamatani
- Source: Electronics Letters, Volume 31, Issue 2, p. 124 –125
- DOI: 10.1049/el:19950068
- Type: Article
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–125
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100 Gbit/s, < 2 ps transform-limited supercontinuum optical pulses are transmitted for the first time at three wavelengths over 40 km with less than 1 dB power penalty, maintaining a small time-bandwidth product of less than 0.2. The new source can be applied to ultrafast TDM/WDM transmission and signal processing approaching 1 Tbit/s. - Author(s): S. Norimatsu ; H. Mawatari ; Y. Yoshikuni ; O. Ishida ; K. Iwashita
- Source: Electronics Letters, Volume 31, Issue 2, p. 125 –127
- DOI: 10.1049/el:19950066
- Type: Article
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–127
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Solitary DFB laser diodes with 174 kHz beat linewidth are applied to a 10 Gbit/s optical BPSK homodyne detection system for the first time: a sensitivity of –38.9 dBm was achieved. A three-electrode laser forms the local oscillator and is modulated with a partial push-pull scheme to improve its frequency response.
All-optical multiplexing of femtosecond signals using an AlGaAs nonlinear directional coupler
BER performance with soft and hard decision decoder for coherent optical DPSK systems corrupted by phase noise
Four-channel frequency locking using back-reflection dips of a fibre-fed Fabry-Perot filter
Modulation response of monolithic integrated GaAs/AlGsAs optoelectronic switch for high-speed electrical-to-optical data conversion
Penalty-free, 100 Gbit/s optical transmission of < 2 ps supercontinuum transform-limited pulses over 40 km
10 Gbit/s optical BPSK homodyne detection experiment with solitary DFB laser diodes
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- Author(s): E.A. Barbosa ; L.S. Troncoso ; J. Frejlich
- Source: Electronics Letters, Volume 31, Issue 2, p. 127 –128
- DOI: 10.1049/el:19950064
- Type: Article
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The authors show that a simple undoped LiNbO3 monocrystal may be used as a highly performing electro-optic phase modulator in an actively stabilised holographic recording setup regardless of thermal and optical damage effects. The performance of this modulator in a typical time-averaged holographic interferometry experiment is described. - Author(s): S.T. Warr ; M.C. Parker ; R.J. Mears
- Source: Electronics Letters, Volume 31, Issue 2, p. 129 –130
- DOI: 10.1049/el:19950087
- Type: Article
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A new digital architecture combining a spatial light modulator written dynamic hologram and a fixed diffractive grating has been demonstrated to produce a tunable wavelength filter with a tuning resolution of 2.5 nm over a 160 nm range. Three modes of a broadband 1.45 µm laser diode have been isolated using the filter and selectively coupled into singlemode communications fibre. - Author(s): C. Vassallo
- Source: Electronics Letters, Volume 31, Issue 2, p. 130 –131
- DOI: 10.1049/el:19950080
- Type: Article
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Current wide-angle BPM (beam propagation method) algorithms fail to satisfy power conservation in lossless structures. For most practical devices this difficulty can be remedied with no change in calculations by means of a new interpretation of the unknown field.
Actively stabilised electro-optic phase modulator
Optically transparent digitally tunable wavelength filter
Wide-angle BPM and power conservation
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- Author(s): G.M. Foster ; J.R. Rawsthorne ; J.P. Hall ; M.Q. Kearley ; P.J. Williams
- Source: Electronics Letters, Volume 31, Issue 2, p. 132 –133
- DOI: 10.1049/el:19950076
- Type: Article
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The authors report measurements of fibre-optic transceiver modules which use a single optoelectronic integrated circuit (OEIC) subsystem. The optical circuit contains a DFB laser, 3 dB coupler, WDM, monitor photodiode and pin photodetector elements, which are monolithically integrated on a semi-insulating substrate indium phosphide chip. This assembly is designed to provide complete subscriber-termination functionality for bidirectional telephony and unidirectional broadband communication links for access networks. The dual-in-line module provides single fibre network interfacing, is physically compact, is stable for domestic and business environments, requires no cooling, and has the potential to be manufacturable at low cost.
OEIC WDM transceiver modules for local access networks
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- Author(s): Y. Bian and J.D. Last
- Source: Electronics Letters, Volume 31, Issue 2, p. 133 –134
- DOI: 10.1049/el:19950072
- Type: Article
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A novel eigen-decomposition technique for estimating the delays of Loran-C skywave components is presented. This provides the basis for a new generation of receivers which implement adaptive skywave interference monitoring, enhancing reliability and positioning accuracy. Performance of the new technique is demonstrated using off-air data.
Loran-C skywave delay estimation using eigen-decomposition techniques
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- Author(s): K.Y. Hur ; R.A. McTaggart ; A.B. Miller ; W.E. Hoke ; P.J. Lemonias ; L.M. Aucoin
- Source: Electronics Letters, Volume 31, Issue 2, p. 135 –136
- DOI: 10.1049/el:19950063
- Type: Article
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The effects of gate recess etch profiles on DC and RF characteristics of passivated, double pulse doped AlInAs/GaInAs/InP HEMTs were investigated. On-wafer characterisation has revealed that double recessed devices have higher breakdown voltage, lower output conductance, input capacitance, and feedback capacitance compared to conventional single recessed devices. - Author(s): Y. Takahashi ; M. Nagase ; H. Namatsu ; K. Kurihara ; K. Iwdate ; Y. Nakajima ; S. Horiguchi ; K. Murase ; M. Tabe
- Source: Electronics Letters, Volume 31, Issue 2, p. 136 –137
- DOI: 10.1049/el:19950082
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A Si single electron transistor (SET) was fabricated by converting a one-dimensional Si wire on a SIMOX substrate into a small Si island with a tunnelling barrier at each end by means of pattern-dependent oxidation. With this structure, the total capacitance was reduced to ~2 aF, which enabled conductance oscillation of the SET at room temperature. - Author(s): H. Fujimoto ; M. Tanabe ; M. Maeda ; A. Tamura
- Source: Electronics Letters, Volume 31, Issue 2, p. 137 –139
- DOI: 10.1049/el:19950070
- Type: Article
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The Letter presents a new approach to power GaAs MESFETs with planar gate structures, based on the MBE growth technique on an undoped surface GaAs layer on an ion-implanted channel layer. This undoped GaAs layer increases the gate-drain breakdown voltage and serves as both an ideal passivation layer and an ideal annealing cap of ion implanted channels. To realise a good surface condition before MBE growth, the UV-ozone surface treatment is introduced. This new simple structure offers high performance power GaAs MESFETs. - Author(s): P.A. Childs and C.C.C. Leung
- Source: Electronics Letters, Volume 31, Issue 2, p. 139 –141
- DOI: 10.1049/el:19950091
- Type: Article
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p.
139
–141
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Results are presented which suggest that as device dimensions are scaled down, hot carrier reliability problems may re-emerge despite reductions in supply voltage. This conclusion is drawn from theoretical results which show an increasingly important role played by electron-electron interactions as device dimensions are reduced. - Author(s): Y.M. Hsin ; M.C. Ho ; X.B. Mei ; H.H. Liao ; T.P. Chin ; C.W. Tu ; P.M. Asbeck
- Source: Electronics Letters, Volume 31, Issue 2, p. 141 –142
- DOI: 10.1049/el:19950084
- Type: Article
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–142
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Novel InP-based heterojunction bipolar transistors (HBTs) using an AlInP pseudomorphic emitter, together with an InP base and collector, have been fabricated. By using InP as both base and collector, the advantages of high electron velocity and high breakdown field of InP collectors are obtained without the problem associated with the energy barrier between the more standard InGaAs/InP base and collector heterojunction. Epitaxial layers were grown by gas-source molecular beam epitaxy (GSMBE). The 200 Å pseudomorphic emitter had an aluminium fraction of 15%, sufficiently suppressing hole injection from the base. The DC gain for 40 × 40 µm2 devices reached 18. The breakdown voltage BVCEO of 10 V is an improvement over devices with InGaAs base and collector layers.
DC and RF characteristics of double recessed and double pulse doped AlInAs/GaInAs/InP HEMTs
Fabrication technique for Si single-electron transistor operating at room temperature
New high power planar gate GaAs MESFETs with improved gate-drain breakdown voltage
New mechanism of hot carrier generation in very short channel MOSFETs
Pseudomorphic AlInP/InP heterojunction bipolar transistors
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- Author(s): E. Bertran and G. Montoro López
- Source: Electronics Letters, Volume 31, Issue 2, p. 142 –144
- DOI: 10.1049/el:19950088
- Type: Article
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A variable structure, model reference adaptive control (VS-MRAC) devoted to cancel interferences without the requirement of an auxiliary input is proposed. This method is an improved alternative to the strategies recently proposed in the control theory literature.
Adaptive VS-MRAC for disturbance cancellation
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