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Balanced MMIC QPSK Modulator with Low Amplitude and Phase Errors
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- Authors
- Seong-Mo Moon, Han Lim Lee, Dong-Hwan Shin, In-Bok Yom, Moon-Que Lee
- Issue Date
- 2014-03
- Citation
- Electronics Letters, v.50, no.7, pp.523-525
- ISSN
- 0013-5194
- Publisher
- IET
- Language
- English
- Type
- Journal Article
- Abstract
- 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 Keywords
- 5 GHz, Amplitude and phase errors, Lange Coupler, Low amplitude, Low noise, Microwave Integrated Circuits(MICs), Microwave monolithic integrated circuits(MMIC), Reflection-type, Root-Mean-Square(RMS), Transmission line, error vector magnitude(EVM)