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.
Original language | English |
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Pages (from-to) | 523-525 |
Number of pages | 3 |
Journal | Electronics Letters |
Volume | 50 |
Issue number | 7 |
DOIs | |
State | Published - 27 Mar 2014 |