Electron. Lett.

2018, 54,

A complementary passive mixer with feedback followed gate bias generation scheme is proposed. The gate voltage of the switches follows the common-mode voltage (V-CM) of the signal paths, so that the proposed mixer achieves constant switching gate-to-source bias voltage and coherent performances while V-CM changes over a certain range. Furthermore, a dc offset cancelation method based on the bias generation circuit is proposed. The dc component of the intermediate frequency is feedbacked to the bias generation input to form a cancelation path. A behavioural model is deduced to prove the effect of the offset cancelation and second intercept point (IIP2) improvement. The proposed mixer is implemented in a 0.13 m CMOS process, and measurement results show that robust performance with the V-CM range of 0.5-0.7 V and 16 dB IIP2 improvement are obtained.