A Low-Power Class-AB Gm-Based Amplifier With Application to an 11-bit Pipelined ADC

 A Low-Power Class-AB Gm-Based Amplifier With Application to an 11-bit Pipelined ADC

 A Gm-based amplifier is proposed for the use in low-voltage and low-power switched-capacitor circuits. At the input stage of the amplifier, a common-mode current-suppression scheme effectively suppresses the common-mode current with the differential-mode current even amplified, resulting in decrease in dc power consumption. At the output stage of the amplifier, a self-biased cascode configuration adaptively changes bias voltages to achieve both the cascode operation for high gain and digital switching operation for fast transients.