Title:
MEASUREMENT CIRCUIT AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/075101
Kind Code:
A1
Abstract:
The present invention improves the accuracy of temperature measurement in a circuit for measuring the temperature by using an operational amplifier. The operational amplifier outputs an output voltage in accordance with a difference in terminal voltage between a pair of input terminals. One of the input terminals is connected to one end of a resistor. A resistor-side rectifier element is connected to the other end of the resistor. A terminal-side rectifier element is connected to the other input terminal. A switch connects an additional rectifier element to the resistor-side rectifier element or the terminal-side rectifier element in parallel. A current output unit outputs a current in accordance with the output voltage. A difference acquisition unit calculates, as temperature data, a difference between a signal corresponding to the current when the additional rectifier element is not connected and a signal corresponding to the current when the additional rectifier element is connected.
Inventors:
KOSAKA TAKURO (JP)
TAKENAKA KYOICHI (JP)
TAKENAKA KYOICHI (JP)
Application Number:
PCT/JP2020/027194
Publication Date:
April 22, 2021
Filing Date:
July 13, 2020
Export Citation:
Assignee:
SONY SEMICONDUCTOR SOLUTIONS CORP (JP)
International Classes:
G01K7/01; H04N5/374; H04N5/3745
Foreign References:
| JPH0979916A | 1997-03-28 | |||
| KR20180024373A | 2018-03-08 | |||
| US20190094079A1 | 2019-03-28 | |||
| JP2011220777A | 2011-11-04 | |||
| JP2011198093A | 2011-10-06 | |||
| JP2011081517A | 2011-04-21 |
Attorney, Agent or Firm:
MARUSHIMA, Toshikazu (JP)
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