JPS62169524U - - Google Patents
Info
- Publication number
- JPS62169524U JPS62169524U JP5705886U JP5705886U JPS62169524U JP S62169524 U JPS62169524 U JP S62169524U JP 5705886 U JP5705886 U JP 5705886U JP 5705886 U JP5705886 U JP 5705886U JP S62169524 U JPS62169524 U JP S62169524U
- Authority
- JP
- Japan
- Prior art keywords
- gain
- analog switch
- resistor
- switching circuit
- amplifier
- 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
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Control Of Amplification And Gain Control (AREA)
Description
第１図は本考案に係わる増幅器のゲイン切替回
路の一実施例を示す構成図、第２図は本考案回路
の他の実施例を示す構成図、第３図および第４図
はそれぞれ従来回路の構成図である。
１１……オペアンプ、１２……フオトダイオー
ド、１３……単方向半導体素子、１４……出力端
子、Ｒ１，Ｒ２……ゲイン抵抗、ＡＳ１〜ＡＳ３
……アナログスイツチ。
FIG. 1 is a block diagram showing one embodiment of an amplifier gain switching circuit according to the present invention, FIG. 2 is a block diagram showing another embodiment of the circuit of the present invention, and FIGS. 3 and 4 are conventional circuits, respectively. FIG. 11... operational amplifier, 12... photodiode, 13... unidirectional semiconductor element, 14... output terminal, R1 , R2 ... gain resistor, AS1 to AS3
...Analog switch.
Claims (1)
のゲイン抵抗とこれらゲイン抵抗を切替え選択す
る第１のアナログスイツチとが接続され、かつ、
前記ゲイン抵抗と前記第１のアナログスイツチと
の中間部分から第２のアナログスイツチを介して
出力を取り出す増幅器のゲイン切替回路において
、 前記抵抗値の小さい側の前記ゲイン抵抗と前記
第１のアナログスイツチとの間に単方向半導体素
子を設け、 前記抵抗値の小さい側のゲイン抵抗の非選択時
に該非選択側に属するアナログスイツチのノイズ
やオフセツト等に起因する電圧が選択側ゲイン抵
抗の回路に影響を与えないようにしたことを特徴
とする増幅器のゲイン切替回路。[Claims for Utility Model Registration] A plurality of gain resistors having different resistance values and a first analog switch for switching and selecting these gain resistors are connected between the input and output terminals of an operational amplifier, and
In an amplifier gain switching circuit that takes out an output from an intermediate portion between the gain resistor and the first analog switch via a second analog switch, the gain resistor on the side with a smaller resistance value and the first analog switch A unidirectional semiconductor element is provided between the gain resistor and the gain resistor, so that when the gain resistor with the smaller resistance value is not selected, the voltage caused by noise, offset, etc. of the analog switch belonging to the unselected side affects the circuit of the selected gain resistor. An amplifier gain switching circuit characterized in that the amplifier gain switching circuit is configured such that the gain switching circuit does not give any
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5705886U JPS62169524U (en) | 1986-04-16 | 1986-04-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5705886U JPS62169524U (en) | 1986-04-16 | 1986-04-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62169524U true JPS62169524U (en) | 1987-10-27 |
Family
ID=30886416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5705886U Pending JPS62169524U (en) | 1986-04-16 | 1986-04-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62169524U (en) |
-
1986
- 1986-04-16 JP JP5705886U patent/JPS62169524U/ja active Pending
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