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.
Titolo: | A 4.1-mW 10-MHz Fourth-Order Source-Follower-Based Continuous-Time filter with 79-dB DR |
Autori: | |
Data di pubblicazione: | 2006 |
Rivista: | |
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. |
Handle: | http://hdl.handle.net/11587/111955 |
Appare nelle tipologie: | Articolo pubblicato su Rivista |