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Very Low-Voltage Fully-Differential Amplifier for Switched-Capacitor Applications

Abstract : A fully differential opamp suitable for very-low voltage switched-capacitor circuits in standard CMOS technologies is introduced. The proposed two stage opamp needs a simple low voltage CMFB switched-capacitor circuit only for the second stage. Due to the reduced supply voltage, the CMFB circuit is implemented using boot-strapped switches. Minor modifications allow to use chopper stabilization for flicker noise reduction. Two different compensation schemes are discussed and compared using an example for 1 V operation of the amplifier.
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Mohamed Dessouky, Andreas Kaiser. Very Low-Voltage Fully-Differential Amplifier for Switched-Capacitor Applications. IEEE International Symposium on Circuits and Systems (ISCAS 2000), May 2000, Geneva, Switzerland. pp.441-444, ⟨10.1109/ISCAS.2000.857466⟩. ⟨hal-01573055⟩



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