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access icon free Balanced MMIC QPSK modulator with low amplitude and phase errors

  • Author(s): Seong-Mo Moon 1 ; Han Lim Lee 2 ; Dong-Hwan Shin 1 ; In-Bok Yom 1 ; Moon-Que Lee 3
    • View affiliations
    • Affiliations: 1: Satellite and Wireless RF Technology Research Section, ETRI, 138 Gajeong-ro, Yuseong-gu, Daejeon 305-700, Republic of Korea;
      2: Electrical Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;
      3: Electrical and Computer Engineering, University of Seoul, Siripdae-Gil 13, Dongdaemun-gu, Seoul 130-743, Republic of Korea
  • Source: Volume 50, Issue 7, 27 March 2014, p. 523 – 525
    DOI:  10.1049/el.2013.2444 , Print ISSN 0013-5194, Online ISSN 1350-911X
© The Institution of Engineering and Technology
Received 30/07/2013, Published 19/03/2014

A broadband monolithic microwave integrated circuit (MMIC) quadrature phase shift keying (QPSK) modulator with low amplitude and phase errors is proposed. The presented modulator adopts two wideband reflection-type binary BPSK modulators, each consisting of a modified Lange coupler with additional λ/4 transmission lines, varactor diodes, inductors and resistors. The proposed QPSK modulator is implemented in 0.15 μm GaAs low-noise pHEMT process. The measurements show an error vector magnitude and a demodulated I/Q offset <5.8% root-mean-square and −16.1 dB, respectively, from 18 to 26.5 GHz.

Inspec keywords: semiconductor device measurement; high electron mobility transistors; MMIC; gallium arsenide; modulators; III-V semiconductors; quadrature phase shift keying; microwave field effect transistors

Other keywords: GaAs; error vector magnitude; inductor; BPSK modulator; root-mean-square; gain -16.1 dB; varactor diode; broadband MMIC quadrature phase shift keying modulator; frequency 18 GHz to 26.5 GHz; additional λ/4 transmission line; RMS; EVM; low-noise p high electron mobility transistor process; demodulated I-Q offset; resistor; modified Lange coupler; balanced MMIC QPSK modulator; phase error; pHEMT process; amplitude error

Subjects: Modulators, demodulators, discriminators and mixers; Microwave integrated circuits; Solid-state microwave circuits and devices; Modulation and coding methods; Other field effect devices

References

    1. 1)
      • 5. Sun, Y., Freundorfer, A.P., Sawatzky, D.: ‘A QPSK direct digital modulator in GaAs HBT at 28 GHz’. CCECE, Saskatoon, Canada, May 2005.
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