A monolithic Si PCS-CDMA power amplifier with an impedance-controllable biasing schemeTUE3F-4 A MONOLITHIC SI PCS-CDMA POWER AMPLIFIER WITH AN IMPEDANCE-CONTROLLABLE BIASING SCHEME Sifen Luo and Tirdad Sowlati Philips Research, Briarcliff Manor, New York 10530, USA Abstract - This paper for the first time presents a monolithic Si PCS-CDMA power amplifier (PA) capable of delivering 28.2dBm output power with 30% power-added efficiency (PAE) and -45dBc adjacent-channel-power ratio (ACPR) at 1.9GHz and 3.6V supply voltage. The PA implemented in a 30GHz BiCMOS process incorporates a novel impedance-controllable biasing scheme to control class of operation and bias impedance of the output stage. controllable biasing scheme for the PA and its advantages over the conventional one are presented in Section 111. Measured results of the PA with the impedancecontrollable biasing scheme……