An IIP2 calibration technique for CMOS multi-standard mixers

Meeting the linearity required by GSM and UMTS receivers in CMOS technology is challenging. A new IIP2 calibration technique based on canceling the second order nonlinearities of mixer, generated in the input RF transistors, is introduced in this paper. By using this technique about 22 dB IIP2 improvement in a mixer supporting UMTS standard is achieved. The proposed calibration technique can be used in multi-standard mixers because of high bandwidth of the calibration circuitry. Moreover it can work with voltage supplies as low as IV. The design is done in CMOS 65 nm technology with 1.2 V supply while it consumes about 7 mA current.