Analog Devices Global

Yogesh Jayarman Sharma

Colin Gerard Lyden

Arthur Joseph Kalb

Marvin Liu Shu

Sanjay Rajasekhar

Roberto S Maurino

Gerard Mora-Puchalt

Pasquale Delizia

An input stage to an analog to digital converter (ADC) includes at least one sampling capacitor (SC) for sampling an input signal in acquire phases, a capacitive gain amplifier (CGA) for providing the input signal to the SC, and bandwidth control means. The bandwidth control means is configured to ensure that the SC has a first bandwidth during a first part of an acquire phase and has a second bandwidth during a subsequent, second, part of said acquire phase, the second bandwidth being smaller than the first. In this manner, first, the input signal is sampled at a higher, first, bandwidth allowing to take advantage of using a high-bandwidth CGA to minimize settling error on the SC, and, next, during a second part of the same acquire phase, the input signal is sampled at a lower, second, bandwidth advantageously decreasing noise resulting from the use of a high-bandwidth CGA.

Low noise precision input stage for analog-to-digital converters

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Santa Clara, CA, United States of America

Yogesh Jayarman Sharma