Title:
FAST START-UP SAMPLE-AND-HOLD SWITCHED CAPACITOR CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2023/026350
Kind Code:
A1
Abstract:
A switched capacitor circuit for a capacitive sensor system includes an amplifier having a first input terminal, a second input terminal, and an output coupled to the second input terminal. The first input terminal is a non-inversion input terminal and the second input terminal is an inversion input terminal. The switched capacitor circuit further includes a first capacitor, a first switch configured to selectively couple the first capacitor to an input voltage to charge the first capacitor, a second switch configured to selectively couple the first capacitor to the first input terminal, a second capacitor, a third switch configured to selectively couple the second capacitor to the first input terminal, and a fourth switch configured to selectively couple the second capacitor to the output of the amplifier.
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Inventors:
VINCENT PAUL (US)
QUIST BRENT (US)
QUIST BRENT (US)
Application Number:
PCT/JP2021/030934
Publication Date:
March 02, 2023
Filing Date:
August 24, 2021
Export Citation:
Assignee:
ALPS ALPINE CO LTD (JP)
International Classes:
H03H19/00; H03F3/70; H03K17/00; H03K17/955; H03M1/12
Domestic Patent References:
| WO2012034714A1 | 2012-03-22 |
Foreign References:
| US20180019745A1 | 2018-01-18 | |||
| US7495480B2 | 2009-02-24 | |||
| US8576002B2 | 2013-11-05 | |||
| US20050190090A1 | 2005-09-01 | |||
| US6445294B1 | 2002-09-03 |
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
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