A low voltage single-balanced down-conversion transformer coupled mixer

A 900 MHz single balanced mixer utilizing an above IC (AIC) transformer as an RF coupling device has been implemented using a 0.8 /spl mu/m SiGe BiCMOS process. The 1.73/spl times/2 mm/sup 2/ chip is packaged in an SSOP20 ceramic package and operates at a low supply voltage of 1-2 V. The mixer utilizes a minimum number of off chip components for matching at the RF port. At 900 MHz and 2 V supply voltage, the mixer dissipates 4 mA, provides a 9.3 dB power gain, 7.88 dB noise figure (NF) and a 3 dBm input intercept point (IIP3). The same design is implemented using an off chip transformer.