Title:
ANALOG-DIGITAL CONVERTER AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/137821
Kind Code:
A1
Abstract:
The present invention reduces the size of a circuit in an SAR ADC in which a circuit for cancelling ripples is provided. According to the present invention, a digital-analog converter generates at least one of a pair of analog signals in accordance with a predetermined control signal. A comparator compares the pair of analog signals, and generates and outputs a comparison result. A logic circuit generates the control signal on the basis of the comparison result. A plurality of switches, on the basis of the control signal, open or close paths between an output terminal of the comparator and sources or drains of a plurality of positive-side transistors having different sizes and a plurality of negative-side transistors having different sizes. A positive-side common capacitor has one end connected to a node of a predetermined positive-side reference voltage, and has the other end connected to, in a shared manner, the gates of the plurality of positive-side transistors. A negative-side capacitor has one end connected to a node of a negative-side reference voltage which is lower than the positive-side reference voltage, and has the other end connected to, in a shared manner, the gates of the plurality of negative-side transistors.
Inventors:
YAGISHITA YUKI (JP)
Application Number:
PCT/JP2021/040499
Publication Date:
June 30, 2022
Filing Date:
November 04, 2021
Export Citation:
Assignee:
SONY SEMICONDUCTOR SOLUTIONS CORP (JP)
International Classes:
H03M1/10; H03K5/08; H03M1/38; H03M1/46
Foreign References:
| JP2019220780A | 2019-12-26 | |||
| US20130057422A1 | 2013-03-07 | |||
| US20190131988A1 | 2019-05-02 |
Other References:
TANG XIYUAN; SHEN YI; XIN XIN; LIU SHUBIN; CAI JUEPING; ZHU ZHANGMING; SUN NAN: "A 10-Bit 100-MS/s SAR ADC with Always-on Reference Ripple Cancellation", 2020 IEEE SYMPOSIUM ON VLSI CIRCUITS, 16 June 2020 (2020-06-16), pages 1 - 2, XP033808748, DOI: 10.1109/VLSICircuits18222.2020.9162786
Attorney, Agent or Firm:
MARUSHIMA, Toshikazu (JP)
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