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US 12,191,830 B2Granted
Switched-capacitor amplifier
AssigneeDenso Corporation
InventorShogo Kawahara
Life of this patent
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Abstract
A switched-capacitor amplifier includes a sampling capacitor, a first switch, a differential amplifier, a reference power supply, a second switch, a third switch, and a controller configured to execute on and off control of the first to third switches. The second switch includes a series circuit of first and second metal oxide semiconductor (MOS) transistors and a potential holding capacitor connected between a node that is a common connection point of the first and second MOS transistors and a ground.
Claims4
A switched-capacitor amplifier comprising:
- a sampling capacitor;
- a first switch connected between a signal input terminal and one terminal of the sampling capacitor;
- a differential amplifier including an inverting input terminal connected to another terminal of the sampling capacitor and an output terminal connected to a signal output terminal;
- a reference power supply configured to apply a predetermined voltage to a non-inverting input terminal of the differential amplifier;
- a second switch connected between the inverting input terminal of the differential amplifier and the signal output terminal;
- a third switch connected between a common connection point of the first switch and the sampling capacitor and the signal output terminal;
- and
- a controller configured to execute on and off control of the first to third switches, wherein
- the second switch includes a series circuit of first and second metal oxide semiconductor (MOS) transistors and a potential holding capacitor connected between a node that is a common connection point of the first and second MOS transistors and a ground, and a back gate of the first MOS transistor is connected only to the node together with a source of the first MOS transistor.
6 more elements
Dependencies are inferred from the claim text.