JPS5651609A - Input circuit - Google Patents
Input circuitInfo
- Publication number
- JPS5651609A JPS5651609A JP12872279A JP12872279A JPS5651609A JP S5651609 A JPS5651609 A JP S5651609A JP 12872279 A JP12872279 A JP 12872279A JP 12872279 A JP12872279 A JP 12872279A JP S5651609 A JPS5651609 A JP S5651609A
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- resistor
- circuit
- phase noise
- connects
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
PURPOSE: To make it possible to obtain easily a high in-phase noise removal ratio without reference to the precision of a resistance value, by providing a specific switch circuit that connects the output side of an operational amplifier to the control input side of a switch element.
CONSTITUTION: Switch circuit 21 that connects the output side of operational amplifier 28 to the control input side of switch element 29 as shown in the figure is provided and one terminal of element 29 is connected to the reference potential point via output resistor 27. For example, the input circuit that uses thermocouple 31 as an input signal source is constituted in the figure so as to obtain voltage eo across resistor 27 in proportion to input signal voltage ei. In this circuit, if an in-phase noise from noise source 32 is to change electric current flowing through FET29, the current change is suppressed under the control that provides the zero balance of operational amplifier 28 and current i0 flowing through resistor 26 holds itself constant without being influenced by the in-phase noise.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12872279A JPS5651609A (en) | 1979-10-04 | 1979-10-04 | Input circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12872279A JPS5651609A (en) | 1979-10-04 | 1979-10-04 | Input circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5651609A true JPS5651609A (en) | 1981-05-09 |
JPH0118384B2 JPH0118384B2 (en) | 1989-04-05 |
Family
ID=14991809
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12872279A Granted JPS5651609A (en) | 1979-10-04 | 1979-10-04 | Input circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5651609A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63295967A (en) * | 1987-05-28 | 1988-12-02 | Rion Co Ltd | Physical quantity detector |
CN102879015A (en) * | 2011-07-13 | 2013-01-16 | 艾尔默斯半导体股份公司 | Device for ambient light compensation for optical sensors exposed to both useful light and ambient light |
-
1979
- 1979-10-04 JP JP12872279A patent/JPS5651609A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63295967A (en) * | 1987-05-28 | 1988-12-02 | Rion Co Ltd | Physical quantity detector |
CN102879015A (en) * | 2011-07-13 | 2013-01-16 | 艾尔默斯半导体股份公司 | Device for ambient light compensation for optical sensors exposed to both useful light and ambient light |
CN102879015B (en) * | 2011-07-13 | 2016-11-23 | 艾尔默斯半导体股份公司 | It is exposed to the device having the ambient light compensation using up the optical pickocff with ambient light |
Also Published As
Publication number | Publication date |
---|---|
JPH0118384B2 (en) | 1989-04-05 |
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