PIER Letters
Progress In Electromagnetics Research Letters
ISSN: 1937-6480
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By C.-M. Lin, J.-T. Chang, C.-C. Su, S.-H. Hung, and Y.-H. Wang

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A novel 16-31 GHz quadruple subharmonic monolithic passive mixer with a chip dimension of 0.82×0.7 mm2 is designed and fabricated using the 0.15 μm GaAs pHEMT process. The novel configuration of the quadruple subharmonic mixer consists of a lumped frequency diplexer and a low-pass filter 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 filter supports an IF frequency range from DC to 2.5 GHz. From the measured results, the mixer exhibits a 12.5-16.5 dB conversion loss, a LO-to-RF isolation better than 15 dB, a 50-59 dB high 4LO-to-RF isolation over 16-31 GHz RF bandwidth, and an input 1 dB compression power of 2 dBm.

C.-M. Lin, J.-T. Chang, C.-C. Su, S.-H. Hung, and Y.-H. Wang, "A 16-31 GHz Miniature Quadruple Subharmonic Monolithic Mixer with Lumped Diplexer," Progress In Electromagnetics Research Letters, Vol. 11, 21-30, 2009.

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