A RF CMOS base-band analog circuit for IEEE 802.11a/b/g/n WLAN transceiver

A RF CMOS base-band (BB) analog circuit was implemented by using a standard 0.13 mum one-poly-eight-metal (1P8M) RF CMOS technology for IEEE 802.11a/b/g/n MIMO (multiple-input multiple-output) OFDM (orthogonal frequency division multiplexing) WLAN (wireless local area network) application. There are three main skills in this paper to achieve the state of the art wireless communication application. Fist, LPF (low pass filter) sharing architecture for receiver and transmitter was to save size and power consumption. Second, DCOC (DC offset cancellation) HPF was to overcome 100 Hz low cut off frequency for OFDM spectrum mask. And, switched feedback capacitor array was proposed to achieve constant gain throughout the wide bandwidth frequency response. According to the measurement results, the size and power consumption of total BB analog circuits was saved about 25%. Low cut off frequency was 80 Hz, while maintaining constant gain. The circuit dissipates 11 mA from a 1.2-V supply, and the chip area occupies 1.2times0.8 mm2.