Comparator circuit
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United States of America Patent
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Dec 17, 2013
Grant Date -
Aug 25, 2011
app pub date -
May 25, 2009
filing date -
May 23, 2008
priority date (Note) -
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Abstract
A comparator circuit (5) comprising a fully differential main amplifier unit (10, 10b). The main amplifier unit (10, 10b) comprises a control port and is adapted to control a bias current of a first branch of the main amplifier unit (10, 10b) and/or a bias current of a second branch of the main amplifier unit (10, 10b) in response to one or more control voltages supplied to the control port of the main amplifier unit (10, 10b). The comparator circuit (5) comprises circuitry (60) for balancing the voltages at the positive and negative input terminals (12a, 12b) of the main amplifier unit (10, 10b) during a first clock phase of the comparator circuit (5). Furthermore, the comparator circuit (10, 10a) comprises a switched-capacitor accumulator unit with a differential input. The switched-capacitor accumulator unit is operatively connected to the positive and negative output terminals (14a, 14b) of the main amplifier unit (10, 10b) for sampling voltages at the positive and negative output terminals (14a, 14b) of the main amplifier unit (10, 10b) during the first clock phase, and operatively connected to the control port of the main amplifier unit (10, 10b) for supplying said one or more control voltages.
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