JPS63196111U - - Google Patents
Info
- Publication number
- JPS63196111U JPS63196111U JP8689187U JP8689187U JPS63196111U JP S63196111 U JPS63196111 U JP S63196111U JP 8689187 U JP8689187 U JP 8689187U JP 8689187 U JP8689187 U JP 8689187U JP S63196111 U JPS63196111 U JP S63196111U
- Authority
- JP
- Japan
- Prior art keywords
- switch
- range
- switches
- range selection
- input terminal
- 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
- 238000010586 diagram Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Electronic Switches (AREA)
- Control Of Amplification And Gain Control (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Description
第１図は本考案の実施例装置を示す回路図、第
２図は従来装置を示す回路図である。
１……発振回路、２……マイクロプロセツサ、
Ｅ１，Ｅ２……電極、ＳＡ，ＳＢ……切換手段、
Ｓ１〜Ｓ４……スイツチ、Ｓ５〜Ｓ８……レンジ
選択用スイツチ、Ｓ５′〜Ｓ８′……切換スイツ
チ、Ｒ６〜Ｒ９……レンジ抵抗、Ａ２……演算増
幅器、Ａ３……ボルテージフオロワ、３……同期
整流回路、４……Ａ／Ｄ変換器。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional device. 1...Oscillation circuit, 2...Microprocessor,
E 1 , E 2 ... electrode, SA, SB ... switching means,
S1 to S4 ... Switch, S5 to S8 ... Range selection switch, S5 ' to S8 '... Changeover switch, R6 to R9 ... Range resistor, A2 ... Operational amplifier, A3 ...Voltage follower, 3...Synchronous rectifier circuit, 4...A/D converter.
Claims (1)
入力端子に入力信号が与えられ、この入力端子と
出力端子との間の帰還回路にレンジ抵抗とレンジ
選択用スイツチからなる複数の直列回路が並列接
続された第１の増幅器と、前記レンジ選択用スイ
ツチの各々に対応して設けられ、これらスイツチ
と連動する複数の切換スイツチと、入力端子がこ
れら切換スイツチを介し前記レンジ抵抗と前記レ
ンジ選択用スイツチとの接続点に接続された第２
の増幅器とを具備し、切換信号によつて前記レン
ジ選択用スイツチの一つが選択されたとき、この
スイツチと前記レンジ抵抗との接続点の電圧が前
記切換スイツチを介し前記第２の増幅器に与えら
れ、前記レンジ選択用のスイツチのオン抵抗の影
響を受けない出力信号を発生させるようにしたこ
とを特徴とするレンジ切換回路。 One input terminal is connected to a reference potential, an input signal is given to the other input terminal, and multiple series circuits consisting of range resistors and range selection switches are connected in parallel in the feedback circuit between this input terminal and the output terminal. A plurality of changeover switches are provided corresponding to the connected first amplifier and the range selection switch and operate in conjunction with these switches, and input terminals are connected to the range resistor and the range selection switch through these changeover switches. The second one connected to the connection point with the switch.
when one of the range selection switches is selected by the switching signal, the voltage at the connection point between this switch and the range resistor is applied to the second amplifier via the changeover switch. and generating an output signal that is not affected by the on-resistance of the range selection switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8689187U JPS63196111U (en) | 1987-06-04 | 1987-06-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8689187U JPS63196111U (en) | 1987-06-04 | 1987-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63196111U true JPS63196111U (en) | 1988-12-16 |
Family
ID=30943616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8689187U Pending JPS63196111U (en) | 1987-06-04 | 1987-06-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63196111U (en) |
-
1987
- 1987-06-04 JP JP8689187U patent/JPS63196111U/ja active Pending
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