In this paper a 4th order low-pass continuous-time filter for a WLAN receiver is presented. The filter is designed to satisfy high-linearity performance while operating at very-low supply voltage. An improved bias circuit is used to operate with different opamp input and output common-mode voltages. The filter is realized in a standard 0.13um CMOS technology with V THN≈250mV and VTHP≈300mV. The filter is optimally operating with supply voltage as low as 550mV and slightly below. The filter architecture is composed by two Active Gm-RC biquadratic cells, which use a single opamp per-cell with a unity-gain-bandwidth comparable to the filter cut-off frequency. This reduces the total cell power consumption. The -3dB frequency is at 12MHz (for WLAN applications) and this is higher than any other low-voltage continuous-time filter. The -3dB frequency can be adjusted by means of a digitally-controlled capacitance array. The filter total area occupancy is 0.47mm2 and the total power consumption is 3.4 mW from a single 550mV supply. A 8dBm-in-band IIP3 and a 13.3dBm-out-of-band IIP3 demonstrate the validity of the proposal. © 2007 IEEE.
DE MATTEIS, M., D'Amico, S., Giannini, V., Baschirotto, A. (2007). A 550mV 8dBm IIP3 4^pth order analog base band filter for WLAN receivers. In ESSCIRC 2007 - Proceedings of the 33rd European Solid-State Circuits Conference (pp.504-507). 345 E 47TH ST, NEW YORK, NY 10017 USA : IEEE [10.1109/ESSCIRC.2007.4430352].
A 550mV 8dBm IIP3 4^pth order analog base band filter for WLAN receivers
DE MATTEIS, MARCELLO
;BASCHIROTTO, ANDREA
2007
Abstract
In this paper a 4th order low-pass continuous-time filter for a WLAN receiver is presented. The filter is designed to satisfy high-linearity performance while operating at very-low supply voltage. An improved bias circuit is used to operate with different opamp input and output common-mode voltages. The filter is realized in a standard 0.13um CMOS technology with V THN≈250mV and VTHP≈300mV. The filter is optimally operating with supply voltage as low as 550mV and slightly below. The filter architecture is composed by two Active Gm-RC biquadratic cells, which use a single opamp per-cell with a unity-gain-bandwidth comparable to the filter cut-off frequency. This reduces the total cell power consumption. The -3dB frequency is at 12MHz (for WLAN applications) and this is higher than any other low-voltage continuous-time filter. The -3dB frequency can be adjusted by means of a digitally-controlled capacitance array. The filter total area occupancy is 0.47mm2 and the total power consumption is 3.4 mW from a single 550mV supply. A 8dBm-in-band IIP3 and a 13.3dBm-out-of-band IIP3 demonstrate the validity of the proposal. © 2007 IEEE.
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