Double-integration type A/D converter
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United States of America Patent
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Jan 12, 2016
Grant Date -
Sep 3, 2015
app pub date -
Feb 25, 2015
filing date -
Feb 28, 2014
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Abstract
A double-integration type A/D converter for performing A/D conversion by integrating an input voltage and a reference voltage is disclosed. The A/D converter includes an integrator configured to integrate the input voltage and the reference voltage; a first switch configured to relay supply of the input voltage to an input terminal of the integrator; a second switch configured to relay supply of the reference voltage to the input terminal; and a control circuit configured to control switching on and off the first switch and the second switch. The control circuit generates a switching signal that switches on and off the first switch and the second switch individually and a switching signal that switches on and off the first switch and the second switch simultaneously. In addition, superimposition of the input voltage and the reference voltage is integrated when the first switch and the second switch are simultaneously switched on.
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