A Baseband-Noise-Cancelling Mixer-First CMOS Receiver Frontend Attaining 220 MHz IF Bandwidth With Positive-Capacitive-Feedback TIA

Abstract

In this paper, by using the baseband noise cancellation, a CMOS mixer-first analog receiver with power reduction is proposed. Based on a current-mirror transimpedance amplifier structure, positive capacitive feedback is applied to manipulate poles/zeros location, enabling a wide baseband bandwidth and out-of-band second-order filtering profile. The additional radio frequency N-path filtering and baseband 40dB/dec roll-off absorb out-of-band interferences. The presented receiver frontend is fabricated in a standard 65 nm CMOS process. Measured results demonstrate a minimal noise figure of 2.2 dB, and an average voltage gain of 32.2 dB across the 220 MHz intermediate frequency range. The in-band and out-of-band third-order input intercept point manifests −12.8 dBm and 15.5 dBm respectively. The presented receiver circuit draws $\sim $ 32 mW at a typical 1 GHz local oscillator stimulus.

Keywords

• Mixer-first receiver
• noise cancellation
• wideband IF
• capacitive feedback