Double-integration type A/D converter

摘要

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.

主权项

1. A double-integration type A/D converter for performing A/D conversion by integrating an input voltage and a reference voltage, comprising:
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 to open and close the first switch and the second switch, wherein the control circuit generates a switching signal that opens and closes the first switch and the second switch individually and a switching signal that opens and closes the first switch and the second switch simultaneously, and wherein superimposition of the input voltage and the reference voltage is integrated when the first switch and the second switch are simultaneously closed.