The HFA3767 is a monolithic bipolar quadrature modulator with gain control for CDMA/AMPS cellular applications. An upconverter quadrature mixer and an output gain control stage with better than 70dB of dynamic range are integrated in the design. A local oscillator input requires low drive levels and a divide by two phase shifter with duty cycle compensation achieves excellent phase and amplitude balance properties. The HFA3767 is one of the four chips in the PRISMTM chip set and is housed in a 20 lead SSOP package ideally suited to cellular handset applications.