Carrier leak calibration scheme on a 0.18µm transmitter

This paper outlines a calibration scheme to reduce LO feed-through using two offset compensation DACs applied to a Gilbert cell mixer and a low frequency measurement using an ADC. This architecture does not require RF feed-back, as is the case in prior art. The calibration scheme has been implemented on a 0.18um CMOS RF Transceiver IC, which uses a low IF and a single side-band mixer on TX.