A low-power Gm-R-C image rejection filter for complex low-IF receiver | IEEE Conference Publication | IEEE Xplore

A low-power Gm-R-C image rejection filter for complex low-IF receiver


Abstract:

In this paper, a 1st-order Gm-R-C complex filter cell for image rejection in low-IF receivers is proposed. The cell adopts low-power fully differential Gm-cells with RC l...Show More

Abstract:

In this paper, a 1st-order Gm-R-C complex filter cell for image rejection in low-IF receivers is proposed. The cell adopts low-power fully differential Gm-cells with RC load to perform low-pass filtering for the input I/Q signals. Frequency translation is realized by two additional differential Gm cells through directly cross-adding relevant currents. Based on the proposed 1st-order cell, a 4th-order Butterworth complex filter with center frequency at 300 KHz and bandwidth of 160 KHz is designed in 0.18 μm CMOS technology. Simulated results show that the filter achieves an image rejection ratio of 62 dB, an in-band SFDR of 58.9 dB, a pass-band gain of 18 dB, and an input referred noise of 19.4 μVrms, while consuming only 593 μA from a 2.7 V supply.
Date of Conference: 25-28 October 2011
Date Added to IEEE Xplore: 27 February 2012
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Conference Location: Xiamen

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