Feedback followed bias generation scheme for complementary passive mixer

Feedback followed bias generation scheme for complementary passive mixer

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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.

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