Autozeroed set comparator circuitry
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United States of America Patent
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-
Jan 29, 1991
Grant Date -
N/A
app pub date -
Jun 19, 1989
filing date -
Jun 19, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A comparator circuit for operation at video rate signals includes input switches to alternately couple a reference and a signal potential to a summing capacitor. The capacitor is coupled to the input of a first inverting amplifier. The amplifier includes a switch between input and output terminals for selectively autozeroing the amplifier. The amplifier is direct coupled to the input of a second inverting amplifier having an autozero circuit exclusive of a connection to the input of the second amplifier. Timing circuitry for controlling the autozero function is arranged to minimize the effects of clocking transients upsetting the autozeroed potentials thereby reducing the response time and enhancing the sensitivity of the comparator.
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