In this paper, a “composite” source-follower is presented. Using a positive-feedback, the structure synthesizes complex poles with a single branch. This allows to realize a single-branch biquadratic cell. Moreover, due to the intrinsic feedback present in any source-follower, the proposed cell performs larger linearity for smaller Vov (=VGS-VTH ). This is the opposite of other active filters and allows saving the power otherwise used to increase linearity. A fourth-order prototype satisfy typical WLAN 802.11.a/b/g baseband filter specifications has been realized in a 0.18um CMOS at 1.8-V supply. It achieves a 17.5-dBm IIP3 and a -40dB HD3 for a 600-mVpp_diff input signal amplitude. A 24-uVrms noise gives a DR = 79 dB, with 2.25mA current consumption.

A 4.1-mW 10-MHz Fourth-Order Source-Follower-Based Continuous-Time filter with 79-dB DR

D'AMICO, STEFANO;
2006

Abstract

In this paper, a “composite” source-follower is presented. Using a positive-feedback, the structure synthesizes complex poles with a single branch. This allows to realize a single-branch biquadratic cell. Moreover, due to the intrinsic feedback present in any source-follower, the proposed cell performs larger linearity for smaller Vov (=VGS-VTH ). This is the opposite of other active filters and allows saving the power otherwise used to increase linearity. A fourth-order prototype satisfy typical WLAN 802.11.a/b/g baseband filter specifications has been realized in a 0.18um CMOS at 1.8-V supply. It achieves a 17.5-dBm IIP3 and a -40dB HD3 for a 600-mVpp_diff input signal amplitude. A 24-uVrms noise gives a DR = 79 dB, with 2.25mA current consumption.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11587/111955
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