Analog Path for Triple Band WCDMA Polar Modulated Transmitter in 90nm CMOS

Abstract

We present a fully integrated analog path for a 3G polar transmitter in 90nm CMOS. It includes a quad band Digitally Controlled Oscillator providing modulation for the phase data and a single stage Digital Pre-Power Amplifier that combines the phase and amplitude signals while providing the dynamic range for WCDMA. The chip, with integrated LDOs, consumes 60mA from a 1.4V supply while providing 11dBm CW power at 1950MHz, 87dB dynamic range without any calibration, and PN of157dBc/Hz at 40MHz.Index Terms -3G, 90nm, DCO, DPPA, high dynamic range, polar transmitter, WCDMA.