Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 41, Issue 18, 1 September 2005
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Volume 41, Issue 18
1 September 2005
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- Author(s): A.A. Deshmukh and G. Kumar
- Source: Electronics Letters, Volume 41, Issue 18, p. 989 –990
- DOI: 10.1049/el:20051789
- Type: Article
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A broadband E-shaped microstrip antenna is discussed. Its bandwidth is further increased by cutting a pair of tapered slots. Using the even-mode symmetry of an E-shaped microstrip antenna, a compact single slot loaded rectangular microstrip antenna is proposed, which reduces the antenna size by half. - Author(s): W. Choi ; K. Chung ; J. Jung ; J. Choi
- Source: Electronics Letters, Volume 41, Issue 18, p. 990 –991
- DOI: 10.1049/el:20052361
- Type: Article
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A novel and compact ultra-wideband printed antenna with band-rejection characteristic is proposed. By cutting an L-shaped notch on the radiating patch, the impedance bandwidth of the proposed antenna can be enhanced. In addition, a C-shaped slot is introduced to obtain the band-rejection operation of the antenna. The antenna, with compact size of 15.5×21 mm including the ground plane, operates over 3.08–10.97 GHz and has the rejected band from 5.03 to 5.91 GHz. - Author(s): J.-Y. Jan and T.-M. Kuo
- Source: Electronics Letters, Volume 41, Issue 18, p. 991 –993
- DOI: 10.1049/el:20052494
- Type: Article
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A novel CPW-fed wideband planar monopole antenna with a symmetrically slope ground plane is proposed. By choosing the suitable slope angle of this symmetrically slope ground plane, wideband operation can be obtained. From the experimental results, the operating mode has an impedance bandwidth of about 1162 MHz (1700–2862 MHz) that covers the DCS band (1710–1880 MHz), PCS band (1850–1990 MHz), 3G band (1920–2170 MHz), and Bluetooth band (2400–2483 MHz). The proposed antenna within these operating bands has similar monopole-like radiation patterns. It is suitable for application to wireless communication systems with its relatively low profile. - Author(s): S. Lim ; R.L. Rogers ; H. Ling
- Source: Electronics Letters, Volume 41, Issue 18, p. 993 –994
- DOI: 10.1049/el:20052397
- Type: Article
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Electrically small spiral ground planes for a monopole and an electrically small antenna have been designed for HF ground wave transmission. Prototype ground planes have been built and tested. For the monopole, the transmission loss of the designed ground plane is 6 dB better than that of the same size ground radials. For the electrically small antenna, the transmission loss of the designed ground plane is 7 dB better than that of the same size solid ground plane at the antenna's operating frequency. - Author(s): H.-W. Son and C.-S. Pyo
- Source: Electronics Letters, Volume 41, Issue 18, p. 994 –996
- DOI: 10.1049/el:20051536
- Type: Article
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An inductively coupled feed method is explored to design UHF radio frequency identification tag antennas. An analytical model for the proposed feed structure is derived and used to perform simple and wideband impedance match between an antenna and a tag chip without any additional matching networks. The proposed design methodology is verified by comparing the calculations and measurements, which show good agreement. - Author(s): K.C. Hwang and H.J. Eom
- Source: Electronics Letters, Volume 41, Issue 18, p. 996 –997
- DOI: 10.1049/el:20051747
- Type: Article
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Radiation from a ferrite-filled slot array antenna with a superstrate is investigated. The Fourier transform and mode matching are utilised to obtain a rigorous solution. The radiation patterns of a ferrite-filled slot array antenna with a superstrate are measured at 10.05 GHz to confirm good agreement with computational results. - Author(s): R.L. Li ; J. Laskar ; M.M. Tentzeris
- Source: Electronics Letters, Volume 41, Issue 18, p. 997 –999
- DOI: 10.1049/el:20052315
- Type: Article
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A wideband probe-fed circularly polarised circular loop antenna is presented. The wideband performance is achieved by introducing a parasitic loop inside the original loop that is driven by a feed probe. It is found that the 2 dB axial ratio bandwidth can be increased from 6% for a single circular loop to 16% by the introduction of a parasitic loop.
Compact broadband E-shaped microstrip antennas
Compact ultra-wideband printed antenna with band-rejection characteristic
CPW-fed wideband planar monopole antenna for operations in DCS, PCS, 3G, and Bluetooth bands
Design of electrically small ground planes for HF ground wave transmission
Design of RFID tag antennas using an inductively coupled feed
Ferrite-filled slot array antenna with superstrate
Wideband probe-fed circularly polarised circular loop antenna
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- Author(s): N. Otegi ; J.M. Collantes ; M. Sayed
- Source: Electronics Letters, Volume 41, Issue 18, p. 999 –1000
- DOI: 10.1049/el:20051718
- Type: Article
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Calibrated noise figure measurements performed in a vector network analyser are reported. To obtain these measurements, a receiver noise calibration procedure based on analytical calculation is proposed. The procedure is highly compatible with standard SOLT scattering parameter calibration and is especially adapted for simultaneous S-parameter and noise figure measurements. Measurement results on an experimental setup from 1 to 2 GHz are given. - Author(s): J.-Y. Lee
- Source: Electronics Letters, Volume 41, Issue 18, p. 1000 –1002
- DOI: 10.1049/el:20052035
- Type: Article
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A new concept of sustain driver using the magnetic-coupling method is proposed. The sustain pulse slopes affecting discharge uniformity can be adjusted by the turns ratio of the transformer and the current stress of energy recovery switches is successfully reduced by more than 40% with the help of the reflected resonant current generated from the transformer. - Author(s): R. Piesiewicz ; T. Kleine-Ostmann ; N. Krumbholz ; D. Mittleman ; M. Koch ; T. Kürner
- Source: Electronics Letters, Volume 41, Issue 18, p. 1002 –1004
- DOI: 10.1049/el:20052444
- Type: Article
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To obtain realistic models for propagation channels in future pico-cellular indoor terahertz communication systems it is necessary to know the reflective properties of building materials found in a typical office environment. The angular dependent reflection coefficients of different building materials were determined using terahertz time-domain spectroscopy in transmission geometry and Fresnel's equations. This approach is more efficient than a set of measurements in reflection geometry for different angles. Verification of the method with a set of such reflection measurements shows an excellent agreement.
Calibrated noise figure measurements in vector network analyser
Current stress reduction technique for AC PDP sustain driver using magnetic-coupling method
Terahertz characterisation of building materials
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- Author(s): A. Wakejima ; K. Matsunaga ; Y. Okamoto ; Y. Ando ; T. Nakayama ; K. Kasahara ; H. Miyamoto
- Source: Electronics Letters, Volume 41, Issue 18, p. 1004 –1005
- DOI: 10.1049/el:20052513
- Type: Article
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A single-ended amplifier using a single-die GaN-FET was successfully developed for W-CDMA cellular base-station systems. The developed amplifier delivers a peak saturated output power of 280 W with a linear gain of 12.6 dB at a drain voltage of 48 V under 2.15 GHz 3GPP W-CDMA signal input. It is believed that the 280 W output power is the record output power in sigle-ended amplifiers at 2 GHz band. A high drain efficiency of 29% is also obtained at 8 dB power back off from the saturated output power. - Author(s): J. Jeong ; S. Kim ; W. Choi ; H. Noh ; K. Lee ; K.-S. Seo ; Y. Kwon
- Source: Electronics Letters, Volume 41, Issue 18, p. 1005 –1006
- DOI: 10.1049/el:20052191
- Type: Article
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p.
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A W-band divide-by-3 frequency divider with wide bandwidth and low power dissipation is presented using harmonic injection-locking technique. A cascode FET is employed for a self-oscillating second-harmonic mixer which is injection-locked by third-harmonic input to obtain the division order of three. The fabricated frequency divider using 0.1 µm GaAs metamorphic HEMT technology shows superior performance such as large bandwidth of 6.1 GHz around 83.1 GHz (7.3%) under small DC power consumption of 12 mW.
280 W output power single-ended amplifier using single-die GaN-FET for W-CDMA cellular base stations
W-band divide-by-3 frequency divider using 0.1 µm InAlAs/InGaAs metamorphic HEMT technology
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- Author(s): J. Renaudier ; R. Brenot ; B. Dagens ; F. Lelarge ; B. Rousseau ; F. Poingt ; O. Legouezigou ; F. Pommereau ; A. Accard ; P. Gallion ; G.-H. Duan
- Source: Electronics Letters, Volume 41, Issue 18, p. 1007 –1008
- DOI: 10.1049/el:20052173
- Type: Article
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p.
1007
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Self-pulsation at 45 GHz repetition frequency has been demonstrated in 1.5 µm monolithic single-section quantum dot Fabry-Perot semiconductor lasers without saturable absorber. The mode-beating exhibits a narrow linewidth below 100 kHz, demonstrating high phase correlation between these modes. Such modelocked lasers open ways to low timing-jitter components for clock recovery or millimetre-wave generation in wireless transmission applications. - Author(s): D.K. Young ; C.L. Reynolds ; V. Swaminathan ; F.S. Walters
- Source: Electronics Letters, Volume 41, Issue 18, p. 1008 –1010
- DOI: 10.1049/el:20052347
- Type: Article
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p.
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It is known that the Zn doping profile in strained multi-quantum-well (MQW) InGaAsP lasers strongly affects the electro-optical characteristics of these devices and their temperature sensitivity. A systematic investigation of the excitation dependence of the active layer photoluminescence (PL) intensity from compressively strained InGaAsP MQW pin laser material with different Zn doping profiles is described. When the pn junction lies within the active region, the excitation dependence of the PL intensity is superlinear at low excitation and linear at higher excitation. As the Zn profile is set back from the heterointerface creating a displaced pn junction from the active region, the excitation dependence is superlinear and linear at 300 K but becomes linear for all excitation powers at 77 K. The implications of these observations are discussed. - Author(s): P.O. Leisher ; A.J. Danner ; J.J. Raftery ; K.D. Choquette
- Source: Electronics Letters, Volume 41, Issue 18, p. 1010 –1011
- DOI: 10.1049/el:20052394
- Type: Article
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Wedge-shaped holes have been fabricated in the top mirror of proton implant confined vertical-cavity surface-emitting lasers. The index confinement and selective loss introduced by these patterns improved the performance by both increasing the singlemode power and reducing the threshold current of the lasers. A maximum single fundamental mode power of 3.5 mW with a simultaneous reduction of lasing threshold compared to an unmodified laser was observed. Multimode operation was suppressed over the entire laser operating range. - Author(s): M.T. Kelemen ; J. Weber ; G. Kaufel ; G. Bihlmann ; R. Moritz ; M. Mikulla ; G. Weimann
- Source: Electronics Letters, Volume 41, Issue 18, p. 1011 –1013
- DOI: 10.1049/el:20052504
- Type: Article
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High-efficiency tapered diode lasers with ridge-waveguide structure emitting at 976 nm have been realised. High wall-plug efficiencies of more than 57% result in output powers of more than 12 W for a single emitter with 3.5 mm resonator length. A nearly diffraction limited behaviour has been demonstrated up to 8.3 W CW.
45 GHz self-pulsation with narrow linewidth in quantum dot Fabry-Perot semiconductor lasers at 1.5 µm
Influence of Zn doping profiles on excitation dependence of photoluminescence intensity in InGaAsP heterostructures
Proton implanted singlemode holey vertical-cavity surface-emitting lasers
Tapered diode lasers at 976 nm with 8 W nearly diffraction limited output power
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- Author(s): M.-L. Chuang
- Source: Electronics Letters, Volume 41, Issue 18, p. 1013 –1014
- DOI: 10.1049/el:20051748
- Type: Article
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A concurrent dual band microstrip filter using only a single set of open-loop resonators is proposed. Each design parameter of the filter is controlled by two physical parameters and the specifications of the two bands can be met simultaneously. The filter can be designed by the traditional procedure of a single band filter. - Author(s): L. Zhu and H. Wang
- Source: Electronics Letters, Volume 41, Issue 18, p. 1015 –1016
- DOI: 10.1049/el:20052317
- Type: Article
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A novel ultra-wideband (UWB) bandpass filter is proposed on an aperture-backed microstrip line. With an aperture on the ground, a non-uniform resonator is constructed with the first three resonant modes occurring within the UWB band while the parallel coupling between resonator and feeders is largely enhanced. The designed filter exhibits good UWB passband behaviour with insertion loss <1.0 dB and group delay variation <0.25 ns.
Concurrent dual band filter using single set of microstrip open-loop resonators
Ultra-wideband bandpass filter on aperture-backed microstrip line
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- Author(s): J.C.S. Santos Filho ; P. Cardieri ; M.D. Yacoub
- Source: Electronics Letters, Volume 41, Issue 18, p. 1016 –1017
- DOI: 10.1049/el:20052207
- Type: Article
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A simple accurate lognormal approximation to the sum of independent non-identical lognormal variates is derived by matching the first two moments of the inverse exact sum with those of the inverse lognormal approximation. Sample examples are given to illustrate the excellent agreement between exact and approximate sum statistics. - Author(s): T.R. Park ; T.H. Kim ; J.Y. Choi ; S. Choi ; W.H. Kwon
- Source: Electronics Letters, Volume 41, Issue 18, p. 1017 –1019
- DOI: 10.1049/el:20051662
- Type: Article
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A new analytic model of the IEEE 802.15.4 slotted CSMA/CA is proposed, from which throughput and energy consumption are computed in saturation conditions. The analytic results are validated via ns-2 simulations.
Simple accurate lognormal approximation to lognormal sums
Throughput and energy consumption analysis of IEEE 802.15.4 slotted CSMA/CA
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- Author(s): A. Otani ; Y. Tsuda ; F. Hirabayashi ; K. Igawa
- Source: Electronics Letters, Volume 41, Issue 18, p. 1019 –1021
- DOI: 10.1049/el:20052150
- Type: Article
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An advanced envelope detection method has been developed with a novel optical PLL without electrical 10 MHz timebase synchronisation. The principle of this method and the results of 160 Gbit/s far-end measurements using this technique are presented. - Author(s): V.S. Grigoryan ; M. Shin ; P. Devgan ; P. Kumar
- Source: Electronics Letters, Volume 41, Issue 18, p. 1021 –1022
- DOI: 10.1049/el:20052143
- Type: Article
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1021
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Presented is dynamic analysis for SOA-based regenerative amplification (SORA) of phase-noise-degraded DPSK signals, which led to the first recent practical demonstration of a SORA. The modelling results agree with the experiment. The regeneration is achieved without wavelength conversion and/or using additional laser resources. - Author(s): R.A. Cryan and M.J.N. Sibley
- Source: Electronics Letters, Volume 41, Issue 18, p. 1022 –1024
- DOI: 10.1049/el:20051726
- Type: Article
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An original analysis is presented for nk-PPM in which the information is conveyed by the position of k pulses, each within their own frame of n slots, giving nk PPM symbols. Comparisons are made with multiple PPM (MPPM) and it is demonstrated that nk-PPM offers improved orthogonality, a simplified circuit implementation and comparable receiver sensitivity. - Author(s): Z. Zheng ; J. Wang ; Z. Li ; Y. Wang ; L. Leng ; Y. Su
- Source: Electronics Letters, Volume 41, Issue 18, p. 1024 –1025
- DOI: 10.1049/el:20052416
- Type: Article
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A novel optical duobinary detection scheme that optimises the sampling phase of the receiver based on preliminary sequence decision is proposed. Simulation results show significant improvement in dispersion tolerance and back-to-back sensitivity. An implementation using an over-sampling frontend, which is compatible with other designs of electrical dispersion compensation receivers, is also proposed. - Author(s): M. Attygalle ; N. Nadarajah ; A. Nirmalathas
- Source: Electronics Letters, Volume 41, Issue 18, p. 1025 –1027
- DOI: 10.1049/el:20052468
- Type: Article
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A novel technique facilitating wavelength reused upstream transmission in a WDM passive optical network, eliminating wavelength source at ONUs, is proposed and experimentally demonstrated. A subcarrier frequency is used for downstream transmission and the pure optical carrier is filtered and reused for upstream transmission. The scheme requires only simple baseband receivers at both ONU and OLT terminals.
Advanced envelope detection method with novel optical PLL for optical sampling trigger
Mechanism of SOA-based regenerative amplification of phase-noise degraded DPSK signals
nk-pulse position modulation for optical wireless communication
Sampling-phase optimised duobinary receiver enabling improved dispersion tolerance
Wavelength reused upstream transmission scheme for WDM passive optical networks
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- Author(s): S.H. Kim ; J.H. Kim ; B.G. Yu ; Y.T. Byun ; Y.M. Jeon ; S. Lee ; D.H. Woo ; S.H. Kim
- Source: Electronics Letters, Volume 41, Issue 18, p. 1027 –1028
- DOI: 10.1049/el:20052320
- Type: Article
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By using gain nonlinearity characteristics of a semiconductor optical amplifier, an all-optical NAND gate at 10 Gbit/s is demonstrated. The all-optical NAND gate operates in single mechanism, which is cross-gain modulation. In the NAND gate (AB̄+Ā), Boolean AB̄ is obtained by using signal A as a probe beam and signal B as a pump beam in SOA-1. Also, Boolean Ā is obtained by using the clock signal as a probe beam and signal A as a pump beam in SOA-2. By adding the two outputs from SOA-1 and SOA-2, Boolean Ā+AB̄ (logic NAND) can be acquired. The extinction ratio is about 6.1 dB. - Author(s): R. Kim ; J. Zhang ; O. Eknoyan ; H.F. Taylor ; T.L. Smith
- Source: Electronics Letters, Volume 41, Issue 18, p. 1028 –1030
- DOI: 10.1049/el:20052450
- Type: Article
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A distributed feedback electro-optic intensity modulator in Ti:LiNbO3, utilising Bragg reflectors etched in an amorphous Si overlay film, is demonstrated. A maximum modulation depth of 94% is realised at an operating wavelength of 1542 nm.
All-optical NAND gate using cross-gain modulation in semiconductor optical amplifiers
Distributed Bragg feedback intensity modulator in Ti:LiNbO3
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- Author(s): K. Yoshino ; Y. Muramoto ; T. Furuta ; H. Ito
- Source: Electronics Letters, Volume 41, Issue 18, p. 1030 –1031
- DOI: 10.1049/el:20051977
- Type: Article
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A high-speed uni-travelling-carrier photodiode module that operates at ultra-low temperatures is developed. The fabricated module has a very stable optical connection in the temerature range from 300 to 15 K. - Author(s): V.P. Chodavarapu ; R.M. Bukowski ; S.J. Kim ; A.H. Titus ; A.N. Cartwright ; F.V. Bright
- Source: Electronics Letters, Volume 41, Issue 18, p. 1031 –1033
- DOI: 10.1049/el:20052142
- Type: Article
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An optical multi-sensor system based on the excited-state lifetime of luminophore doped xerogels is described. The system is based on the novel concept of combining addressable surface-mount light-emitting diode (SM-LED) arrays with doped xerogel thin films; each SM-LED in the array is coated with a different xerogel-based sensor element. Each sensor element exhibits a unique response profile to the target analyte. A prototype system with a 2×2 LED array is presented, with three of the LEDs coated with xerogel-based sensing layers, each layer having a different sensitivity and response profile to oxygen (O2). - Author(s): J.W. Raring ; E.J. Skogen ; J.S. Barton ; C.S. Wang ; S.P. DenBaars ; L.A. Coldren
- Source: Electronics Letters, Volume 41, Issue 18, p. 1033 –1034
- DOI: 10.1049/el:20051879
- Type: Article
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A novel fabrication method for uni-travelling carrier (UTC) type photodiodes using quantum well (QW) intermixing and MOCVD regrowth is presented. This scheme will enable the monolithic integration of the photodiodes with high gain laser diodes, high efficiency electroabsorption modulators, and high saturation power semiconductor optical amplifiers. The photodiodes fabricated on intermixed quantum wells presented exhibit excellent photocurrent handling capabilities, minimal response roll-off over the 20 GHz of the testing capability, and open 40 Gbit/s eye diagrams.
High-speed uni-travelling-carrier photodiode module for ultra-low temperature operation
Multi-sensor system based on phase detection, an LED array, and luminophore-doped xerogels
Quantum well intermixing and MOCVD regrowth for monolithic integration of 40 Gbit/s UTC type photodiodes with QW based components
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- Author(s): J. Roh
- Source: Electronics Letters, Volume 41, Issue 18, p. 1034 –1036
- DOI: 10.1049/el:20051452
- Type: Article
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A digital controller for a DC-DC converter is implemented with an efficient analogue-to-digital interface scheme. Conventional digital controllers require flash-type ADCs, which need large analogue circuits and thus significantly diminish the advantage of digital implementation. The presented delta-sigma modulated single-bit interface effectively reduces the analogue circuit area, while it achieves good voltage regulations. A silicon chip is implemented and measured to prove the successful operation of the controller.
Analogue-to-digital interface technique for digital controllers in DC-DC converters
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- Author(s): S. Kumar and A. Munoz
- Source: Electronics Letters, Volume 41, Issue 18, p. 1036 –1037
- DOI: 10.1049/el:20052155
- Type: Article
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Switching architectures with sharable parallel memory modules are known to provide scalable switch capacity with the advantage of complete sharing of memory resource. The router switches that belong in this class, namely the shared multibuffer switch and the sliding-window packet switch, are evaluated for comparing their memory-bandwidth requirement.
Memory-bandwidth performance of shared multibuffer switch versus sliding-window switch
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