Abstract
A novel 16{31GHz quadruple subharmonic monolithic passive mixer with a chip dimension of 0:82 £ 0:7mm 2 is designed and fabricated using the 0.15m GaAs pHEMT process. The novel conflguration of the quadruple subharmonic mixer consists of a lumped frequency diplexer and a low-pass fllter utilizing a pair of anti-parallel Schottky barrier diode to achieve quadruple subharmonic mixing mechanism. The lumped frequency diplexer formed with a low-pass network and a high-pass network is used to reduce the chip dimension while operating at low frequency band and to improve the isolation between the RF and LO ports with a broadband operation. The low- pass fllter supports an IF frequency range from DC to 2.5GHz. From the measured results, the mixer exhibits a 12.5{16.5dB conversion loss, a LO-to-RF isolation better than 15dB, a 50{59dB high 4LO- to-RF isolation over 16{31GHz RF bandwidth, and an input 1dB compression power of 2dBm.
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