Amplifier circuits and methods
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United States of America Patent
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Sep 15, 2015
Grant Date -
Jan 30, 2014
app pub date -
Dec 11, 2012
filing date -
Jul 26, 2012
priority date (Note) -
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Abstract
A chopper amplifier circuit for sensing Hall voltage with reduced offsets includes a Hall sampling circuit with a first switching circuit for selectively coupling each of four nodes of a Hall plate to either a power source or a ground terminal. The circuit also includes a differential amplifier and a second switching circuit configured for selectively coupling each of the four nodes to inputs of the differential amplifier. A Hall voltage signal retaining circuit includes two groups of four storage devices and a second group of four storage devices. A third switching circuit is configured for outputs of the differential amplifier to selected ones of the storage devices. A fourth switching circuit is configured for selectively coupling the storage devices outputs of the chopper amplifier circuit.
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