The design, fabrication, and performance of a GaAs monolithic linear vector modulator in the 10-14-GHz band are described. The vector modulator consists of four monolithic microwave integrated circuit (MMIC) chips (a quadrature power splitter, two binary phase shift keying (BPSK) modulators, and a Wilkinson power combiner) and is mounted in a microwave test fixture with input-output isolation of greater than 60 dB. The total area occupied by the four MMIC chips is less than 11 mm/sup 2/, and the total power consumption is less than 1.6 W. The circuit exhibits sideband and carrier rejections of more than 45 dB with third-order intermodulation signals at -40 dBc.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Bogaart et al. (2002) studied this question.