期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 40, 期 3, 页码 622-629出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2005.843598
关键词
active mixer; balun; conversion gain; direct conversion receiver; Gilbert cell; QPSK demodulator
This paper presents the design and performance characteristics of a 20-40 GHz monolithic double-balanced direct conversion mixer implemented using InGaP/GaAs HBT process. The compact MMIC mixer makes use of a Gilbert-cell multiplier and utilizes a broadband monolithic passive balun that has been developed for MMIC applications. The new balun makes use of multi-dielectric layer structure to achieve a broadband performance in a simple coplanar configuration. A measured return loss better than 15 dB, with a maximum insertion loss of 4.5 dB including the 3-dB power splitting loss has been achieved over the band from 15 to 45 GHz. Operated as a downconverter mixer, the newly developed direct conversion mixer achieves a measured conversion gain of 16 dB given an RF signal at 30 GHz, LO drive of 5 dBm and a down-converted baseband signal at 10 MHz. The mixer IP3 occurs at an output power of 4 dBm while the IP2, occurs at an output power of 11 dBm.
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