JPS564877A - Logarithmic conversion circuit for resistance variable sensor - Google Patents
Logarithmic conversion circuit for resistance variable sensorInfo
- Publication number
- JPS564877A JPS564877A JP7981879A JP7981879A JPS564877A JP S564877 A JPS564877 A JP S564877A JP 7981879 A JP7981879 A JP 7981879A JP 7981879 A JP7981879 A JP 7981879A JP S564877 A JPS564877 A JP S564877A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- resistor
- change
- transistor
- sensor
- 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
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
PURPOSE:To change the resistance change of the sensor in which the resistance value changes expotentially into the logarithmic value with good precision, by connecting the silicon diode in series with the resistance variable sensor and detecting the forward voltage of the silicon diode. CONSTITUTION:The silicon diode D1 is connected in series with the sensor Rtheta the resistance value of which is expotentially changed according to the physical change such as temperature change, a voltage is applied from the constant voltage power supply E1, the forward voltage of the diode D1 is input to one input terminal of the operational amplifier A1, resistor R1, transistor TR1 and resistor R2 are connected to the power supply E1, the voltage at the connection point P3 between the resistor R1 and the transistor TR1 is fed to another input terminal of the operational amplifier A1, the output of the operational amplifier is fed back to the base of the transistor TR1, temperature compensation circuit Tc is provided between the resistor R2 and ground, and the potential of the connection point P3 is taken as the output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54079818A JPS5947356B2 (en) | 1979-06-25 | 1979-06-25 | Logarithmic conversion circuit for resistance change sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54079818A JPS5947356B2 (en) | 1979-06-25 | 1979-06-25 | Logarithmic conversion circuit for resistance change sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS564877A true JPS564877A (en) | 1981-01-19 |
| JPS5947356B2 JPS5947356B2 (en) | 1984-11-19 |
Family
ID=13700778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54079818A Expired JPS5947356B2 (en) | 1979-06-25 | 1979-06-25 | Logarithmic conversion circuit for resistance change sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5947356B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5013217A (en) * | 1988-01-29 | 1991-05-07 | Kabushiki Kaisha Toshiba | Compressing apparatus with extended variable capacity range and capacity control method thereof |
| US5050233A (en) * | 1987-08-31 | 1991-09-17 | Kabushiki Kaisha Toshiba | Rotary compressor |
| JPH0540848U (en) * | 1991-11-05 | 1993-06-01 | 日本電子機器株式会社 | Magnetostrictive torque sensor |
-
1979
- 1979-06-25 JP JP54079818A patent/JPS5947356B2/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5050233A (en) * | 1987-08-31 | 1991-09-17 | Kabushiki Kaisha Toshiba | Rotary compressor |
| US5013217A (en) * | 1988-01-29 | 1991-05-07 | Kabushiki Kaisha Toshiba | Compressing apparatus with extended variable capacity range and capacity control method thereof |
| JPH0540848U (en) * | 1991-11-05 | 1993-06-01 | 日本電子機器株式会社 | Magnetostrictive torque sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5947356B2 (en) | 1984-11-19 |
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