JPS5619408A - Detecting circuit for electrostatic capacity difference of differential capacitor - Google Patents
Detecting circuit for electrostatic capacity difference of differential capacitorInfo
- Publication number
- JPS5619408A JPS5619408A JP9572479A JP9572479A JPS5619408A JP S5619408 A JPS5619408 A JP S5619408A JP 9572479 A JP9572479 A JP 9572479A JP 9572479 A JP9572479 A JP 9572479A JP S5619408 A JPS5619408 A JP S5619408A
- Authority
- JP
- Japan
- Prior art keywords
- constant
- operational amplifier
- electrostatic capacity
- differential capacitors
- output voltage
- 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
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
PURPOSE: To lessen an influence of variation in electrostatic capacity due to fluctuations of temperature, etc., by constituting differential capacitors as part of the time- constant part of a sending circuit.
CONSTITUTION: The output voltage of the 2nd operational amplifier A2 is applied to the common connection part of differential capacitors C1 and C2 by way of resistance R2. Further, the common connection part, connected to one terminal of operational amplifier A2, operates as an oscillating circuit. Time constant T of the oscillating circuit including operational amplifier A2 is (C1+C2)R2. Output voltage e0 of operational amplifier A1 is expressed by formula I. Namely, resistances R1 and R2 are constant and electric power voltage E0 is fixed by constant-voltage diodes D5 and D6. Since C1 and C2 are differential capacitors, C1+C2 is invariably constant and output voltage e0 is in proportion to C1-C2. Therefore, even when capacities of differential capacitors vary with temperature, their influences can remarkably be reduced.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54095724A JPS5927844B2 (en) | 1979-07-27 | 1979-07-27 | Differential capacitance difference detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54095724A JPS5927844B2 (en) | 1979-07-27 | 1979-07-27 | Differential capacitance difference detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5619408A true JPS5619408A (en) | 1981-02-24 |
JPS5927844B2 JPS5927844B2 (en) | 1984-07-09 |
Family
ID=14145413
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54095724A Expired JPS5927844B2 (en) | 1979-07-27 | 1979-07-27 | Differential capacitance difference detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5927844B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4418631B4 (en) * | 1993-05-28 | 2005-04-14 | General Scanning Inc., Watertown | Capacitive transducer with feedback control |
-
1979
- 1979-07-27 JP JP54095724A patent/JPS5927844B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4418631B4 (en) * | 1993-05-28 | 2005-04-14 | General Scanning Inc., Watertown | Capacitive transducer with feedback control |
Also Published As
Publication number | Publication date |
---|---|
JPS5927844B2 (en) | 1984-07-09 |
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