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A dual-band switchable harmonic receiver for downconverting the industrial-scientific-medical and local-multipoint-distribution-service bands at 24 and 31 GHz is proposed in this paper. The front end utilizes a new technique for band selection. Mathematical formulation, including the effect of mismatches, for the new switchable harmonic receiver is provided in this paper. In addition, new circuit techniques for the low-noise amplifier and millimeter-wave mixer implementations are presented. The receiver is implemented using 0.18-μm BiCMOS technology with a total power consumption of 60 mW. Measurements show a band rejection higher than 43 dB, gain of 21 and 18 dB, NF lower than 8 and 9.5 dB, and third-order intercept point of -18 and -17 dBm for the 24- and 31-GHz frequency bands, respectively.
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El-Nozahi et al. (2010) studied this question.
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