A quadrature IF mixer with high image rejection for continuous-time complex ΣΔ modulators

Kong-Pang Pun Kong-Pang Pun,J.E Franca,Chiu-Sing Choy Chiu-Sing Choy,Cheong-Fat Chan Cheong-Fat Chan

doi:10.1109/iscas.2002.1010429

A quadrature IF mixer with high image rejection for continuous-time complex ΣΔ modulators

Kong-Pang Pun Kong-Pang Pun, J.E Franca + Show 2 more

https://doi.org/10.1109/iscas.2002.1010429

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Publication Date: Aug 7, 2002

Citations: 2

Affiliation: Chinese University of Hong Kong

#Quadrature IF #IF Mixer + Show 8 more

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Abstract

With an integrated mixer, the continuous-time (CT) lowpass /spl Sigma//spl Delta/ modulator is highly suitable for A/D conversion of IF signals. In this paper, a quadrature IF mixer with high image rejection is proposed for this application. By employing a channel sharing technique and a special clocking scheme, the proposed mixer is insensitive to resistor mismatches and LO phase errors, which are major error sources for image rejection. Simulation results verifying the concept are presented.

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