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학술지 Balanced MMIC QPSK Modulator with Low Amplitude and Phase Errors
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저자
문성모, 이한림, 신동환, 염인복, 이문규
발행일
201403
출처
Electronics Letters, v.50 no.7, pp.523-525
ISSN
0013-5194
출판사
IET
DOI
https://dx.doi.org/10.1049/el.2013.2444
협약과제
14MR3100, 차기위성 Flexible 통신방송 탑재체 핵심기술 개발, 안재영
초록
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 /4 transmission lines, varactor diodes, inductors and resistors. The proposed QPSK modulator is implemented in 0.15 m 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.
KSP 제안 키워드
5 GHz, Amplitude and phase errors, Lange coupler, Low amplitude, Low noise, Microwave monolithic integrated circuits(MMIC), Reflection-type, Root mean square(RMS), Transmission line, Varactor diodes, error vector magnitude