JPS5611693A - Detection circuit for electric charge - Google Patents
Detection circuit for electric chargeInfo
- Publication number
- JPS5611693A JPS5611693A JP8521479A JP8521479A JPS5611693A JP S5611693 A JPS5611693 A JP S5611693A JP 8521479 A JP8521479 A JP 8521479A JP 8521479 A JP8521479 A JP 8521479A JP S5611693 A JPS5611693 A JP S5611693A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- capacitor
- constitution
- fed
- detection circuit
- 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.)
- Pending
Links
Landscapes
- Filters That Use Time-Delay Elements (AREA)
Abstract
PURPOSE: To simplify the constitution, by performing sample storage at the post stage of two stages of charge sensing type (CS) amplifier in switch connection via a coupling capacitor.
CONSTITUTION: The output signal voltage proportional to the difference of input signal charges is produced at the CS amplifier 21 to which the negative feedback capacitor 22 is connected, and another electrode is fed to one electrode of the coupling capacitor 27 connected to the DC power supply 30. Further, when the change- over switches 28, 29 are selected, the voltage across both the electrodes of the capacitor 27 is fed to the CS amplifier 26 at the post-stage and the amplifier 26 produces the detection voltage corresponding to the input charge. In this case, the impedance of the negative feedback capacitor 31 of the amplifier 26 is selected to a given value, then the discharge time constant determined with the discharge resistor 2 is made greater and the amplifier 26 performs sample storage operation. Accordingly, the number of passive elements is less and resistors requiring high accuracy are unnecessary, allowing to establish the detection circuit with a simple constitution.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8521479A JPS5611693A (en) | 1979-07-04 | 1979-07-04 | Detection circuit for electric charge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8521479A JPS5611693A (en) | 1979-07-04 | 1979-07-04 | Detection circuit for electric charge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5611693A true JPS5611693A (en) | 1981-02-05 |
Family
ID=13852317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8521479A Pending JPS5611693A (en) | 1979-07-04 | 1979-07-04 | Detection circuit for electric charge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5611693A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650443A (en) * | 2020-07-02 | 2020-09-11 | 深圳市诺心信息科技有限公司 | Simple capacitance value measuring circuit and method |
-
1979
- 1979-07-04 JP JP8521479A patent/JPS5611693A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650443A (en) * | 2020-07-02 | 2020-09-11 | 深圳市诺心信息科技有限公司 | Simple capacitance value measuring circuit and method |
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