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Comparator circuits with local ramp buffering for a column-parallel single slope ADC

United States Patent

April 26, 2016
View the Complete Patent at the US Patent & Trademark Office
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A comparator circuit suitable for use in a column-parallel single-slope analog-to-digital converter comprises a comparator, an input voltage sampling switch, a sampling capacitor arranged to store a voltage which varies with an input voltage when the sampling switch is closed, and a local ramp buffer arranged to buffer a global voltage ramp applied at an input. The comparator circuit is arranged such that its output toggles when the buffered global voltage ramp exceeds the stored voltage. Both DC- and AC-coupled comparator embodiments are disclosed.
Milkov; Mihail M. (Moorpark, CA)
14/ 523,179
October 24, 2014
GOVERNMENT LICENSE RIGHTS This invention was made with Government support under Contract DE-AC04-94AL85000 awarded by the Department of Energy. The Government has certain rights in the invention.