Gain/bandwidth programmable PA control loop for GMS/GPRS quad-band applications

Abstract

The analog Power Amplifier (PA) control loop of a fullyintegrated GSM/GPRS quad band transceiver [1][2] is presented. The control loop is based on a fully-integrated PA controller which meets all GSM/GPRS specifications. Both the gain and the bandwidth of the PA control loop are programmable as well as the stand-by voltage delivered to the PA. These features, together with a high driving capability (8.4mA @ 2.5V), make this solution capable to interface vast combinations of PAs, couplers and detectors. The proposed PA controller has been integrated in a BiCMOS SiGe 0.35µm process and measures 0.33mm 2 . The current consumption is 2.8mA without load and 7.2mA in the application (using Hitachi PF08109B PA) from a single 2.8V power supply.