COMPARATOR CIRCUITS WITH LOCAL RAMP BUFFERING FOR A COLUMN-PARALLEL SINGLE-SLOPE ADC
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United States of America Patent
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Apr 26, 2016
Grant Date -
Apr 28, 2016
app pub date -
Oct 24, 2014
filing date -
Oct 24, 2014
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Abstract
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.
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