Title:
SEQUENTIAL-COMPARISON-TYPE AD CONVERTER, Iot SENSOR, AND BIOLOGICAL SENSOR
Document Type and Number:
WIPO Patent Application WO/2020/170617
Kind Code:
A1
Abstract:
The present invention provides a Charge Share SAR ADC with which it is possible to raise the order of noise shaping. This sequential-comparison-type AD converter comprises a first-polarity first capacitor, a first-polarity second capacitor, a first-polarity third capacitor, a second-polarity first capacitor, a second-polarity second capacitor, a second-polarity third capacitor, an integrator amplifier, a comparator, and a filter circuit. The integrator amplifier generates a first integrated value and a second integrated value. The comparator compares the first integrated value and the second integrated value, and, on the basis of the comparison result, redistributes a charge accumulated in the first-polarity third capacitor and a charge accumulated in the second-polarity third capacitor to the first-polarity second capacitor or the second-polarity second capacitor. After the redistribution is repeated, the charge accumulated in the first-polarity third capacitor and the charge accumulated in the second-polarity third capacitor are inputted as residual voltage into the filter circuit.
Inventors:
HASEBE KAZUNORI (JP)
Application Number:
PCT/JP2020/000063
Publication Date:
August 27, 2020
Filing Date:
January 06, 2020
Export Citation:
Assignee:
SONY SEMICONDUCTOR SOLUTIONS CORP (JP)
International Classes:
H03M1/40; A61B5/00; H03M1/08; H03M1/14; H03M1/16
Domestic Patent References:
| WO2009088041A1 | 2009-07-16 |
Foreign References:
| JP2018125652A | 2018-08-09 | |||
| JP2012074919A | 2012-04-12 | |||
| JP2016025552A | 2016-02-08 | |||
| JP2010517327A | 2010-05-20 | |||
| US20080258951A1 | 2008-10-23 | |||
| US20150109159A1 | 2015-04-23 | |||
| US20080129570A1 | 2008-06-05 |
Attorney, Agent or Firm:
WATANABE Kaoru (JP)
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