High linearity CMOS mixer for domotic 5 GHz WLAN sliding-IF receivers

The present paper describes the design of a 1.1 GHz CMOS, fully differential, down conversion mixer to be used as a second down conversion mixer in an integrated transceiver for 5 GHz domotic WLAN. The circuit was implemented in a 0.35 μm SiGe BiCMOS technology and designed with the aim of getting high linearity without excessive reduction in the conversion gain. The obtained circuit exhibits a conversion gain of −1 dB and a third-order input intercept point of +10 dBm. Biased at 3 V, it dissipates 45 mW.