Feedback followed bias generation scheme for complementary passive mixer

Abstract

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 μm 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.

A 77-GHz Down-Conversion Mixer with +18.4 dB High Gain, +12.2 dBm OIP3, and Low Noise in 90-nm CMOS Technology

“…Although CMOS passive mixers are becoming more and more common due to their high linearity and low icker noise angle, the presence of conversion losses and inadequate reverse isolation in these mixers frequently results in dangerous NF and IQ crosstalk problems, necessitating additional complexity circuit modules to address the performance issues [2]. Contrarily, the Gilbert double-balanced mixer architecture is frequently utilized in millimeter-wave applications due to its compact layout, excellent port isolation properties, moderately high performance, and improved noise rejection for subsequent building blocks.…”