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A 65nm CMOS Current-Mode Receiver Frontend with Frequency-Translational Noise Cancelation and 425MHz IF Bandwidth
An LNA-first receiver frontend including the main/auxiliary paths is proposed. A frequency-translational noise cancellation is attained at the input of a transimpedance amplifier (TIA) shared by the dual paths. The RF input matching is examined, based on an up-conversion of baseband (BB) parasitic. The TIA is customized to provide wideband coverage and high-order filtering. With current mirrors applied to the RF/BB, the presented current-mode frontend has been fabricated in a 65 nm CMOS. Measurements show that the BB bandwidth covers 425 MHz while the S11 <-10 dB is maintained up to ~4.7 GHz. At typical 2 GHz LO, a 40 dB conversion gain and a 2.2 dB NF are obtained within the passband. The in-band and out-of-band IIP3 linearity are measured with -13 dBm and 14.5 dBm, respectively. The presented circuit core dissipates 44 mW in the signal path and occupies a chip area of 0.52 mm².