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

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3 Author(s)
D'Amico, S. ; Dept. of Innovation Eng., Lecce Univ. ; Conta, M. ; Baschirotto, A.

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 0.18 mum CMOS at 1.8-V supply. It achieves a 17.5-dBm IIP3 and a -40 dB HD3 for a 600-mVpp_diff input signal amplitude. A 24-muVrms noise gives a DR=79 dB, with 2.25-mA current consumption

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Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 12 )