Title: Switched-opamp - an approach to realize full cmos switched-capacitor circuits at very-low power-supply voltages
Authors: Crols, J ×
Steyaert, Michel #
Issue Date: Aug-1994
Publisher: Ieee-inst electrical electronics engineers inc
Series Title: IEEE Journal of Solid-State Circuits vol:29 issue:8 pages:936-942
Abstract: The implementation of analog CMOS circuits that operate in the very low power supply voltage range (1 V to 2 V) becomes more important nowadays. Most accurate filter circuits are designed in the switched-capacitor technique. The existing design techniques require, however, the on-chip generation of a higher voltage by means of a voltage multiplier. In this paper, a novel technique, derived from the standard switched-capacitor technique, is presented. It is called switched-opamp because it is based on the replacement of the critical switches with opamps which are turned on and off. This technique results in a true, very low voltage operation without the need for voltage multipliers. As an example, a second order lowpass switched-capacitor filter is implemented in the switched-opamp technique. This filter operates with only a 1.5 V power supply. It is realized in a 2.4-mum CMOS process with V(T) = +/-0.9 V. It has a measured total harmonic distortion of -60 dB for a signal swing of 600 mV(ptp) and a powerdrain of only 110 muW.
ISSN: 0018-9200
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - MICAS, Microelectronics and Sensors
× corresponding author
# (joint) last author

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