An Interferer-Tolerant RX with Translational Positive Feedback for 5G NR Applications Achieving 3.4 dB NF and 18 dBm OOB IIP3

A direct conversion receiver front-end with frequency-translated positive feedback is presented in this paper. The forward path includes a low-noise transconductance amplifier, four-phase passive mixers and 3-rd order filtering transimpedance amplifiers. A tunable RC feedback path is attached at the baseband output, followed by an additional fourphase passive up-conversion mixers, allowing tunable, frequencyselective input matching. An on-chip frequency divider provides quadrature LO waveforms with a 25% duty cycle and no overlap. The receiver is fabricated in 28 nm CMOS technology and operates between 2 and 2.8 GHz, has an RF bandwidth of 28 MHz, more than 40 dB gain, and a Noise Figure of 3 to 3.4 dB. Out-of-band IIP3 and 1-dB blocker compression are 18 dBm and -2dBm respectively. The receiver core consumes 37mW.