A C-band monolithic silicon-bipolar low-power low-IF WLAN receiver

This paper presents the design, implementation and measurements of a monolithic low-IF receiver compliant with the main 5GHz WLAN standards. It consists of a low-noise preamplifier, that is simultaneously noise and power matched to the RF source, two matched active single-balanced mixers and two polyphase filters used to generate LO quadrature signals and provide image rejection. Realized in a 47 GHz-_ft commercial BiCMOS technology, the circuit exhibits 25 dB of conversion gain, 35 dB of IRR, 8.9 dB of NF. -12.5 dBm and -19 dBm of iIP