JPS61143322U - - Google Patents
Info
- Publication number
- JPS61143322U JPS61143322U JP2675085U JP2675085U JPS61143322U JP S61143322 U JPS61143322 U JP S61143322U JP 2675085 U JP2675085 U JP 2675085U JP 2675085 U JP2675085 U JP 2675085U JP S61143322 U JPS61143322 U JP S61143322U
- Authority
- JP
- Japan
- Prior art keywords
- switching means
- terminal
- ground
- variable resistance
- capacitor connected
- 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
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Amplitude Modulation (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Control Of Amplification And Gain Control (AREA)
Description
第１図は本考案に係る可変利得増幅器の一実施
例を示す回路図、第２図は各スイツチの実際の構
成を示した上記実施例の回路図、第３図は従来よ
りデータサンプルシステムに用いられているスイ
ツチトキヤパシタ増幅器の一例を示す回路図であ
る。
１１……信号入力端子、１２，１４……スイツ
チ、１３，１５，２１……コンデンサ、１６……
トランジスタ、１８……制御端子、１９……直流
電源、２０……演算増幅器、２２……信号出力端
子、３１，３２，３３，３４……トランジスタ。
Fig. 1 is a circuit diagram showing one embodiment of the variable gain amplifier according to the present invention, Fig. 2 is a circuit diagram of the above embodiment showing the actual configuration of each switch, and Fig. 3 is a circuit diagram showing an example of the variable gain amplifier according to the present invention. FIG. 2 is a circuit diagram showing an example of a switched capacitor amplifier used. 11... Signal input terminal, 12, 14... Switch, 13, 15, 21... Capacitor, 16...
Transistor, 18... Control terminal, 19... DC power supply, 20... Operational amplifier, 22... Signal output terminal, 31, 32, 33, 34... Transistor.
Claims (1)
の切換手段と、 この切換手段の選択端子と接地間に接続された
第１のコンデンサと、 上記第１の切換手段の他方の被選択端子が一方
の被選択端子に接続された第２の切換手段と、 上記第１および第２の切換手段の相互に接続さ
れた各被選択端子間と接地間に接続され制御信号
により抵抗値が制御される可変抵抗手段と、 上記第２の切換手段の選択端子と接地間に接続
された第２のコンデンサと、 上記第２の切換手段の他方の被選択端子に入力
端子が接続された演算増幅器と、 この演算増幅器の入力端子と出力端子の間に接
続された第３のコンデンサとを備え、 上記第１および第２の切換手段を連動して切換
制御し各選択端子と上記可変抵抗手段の電気的な
接続状態と非接続状態とを交互に繰返させ、上記
制御信号により上記可変抵抗手段の抵抗値を変化
させることによつて利得を変化させるようにした
ことを特徴とする可変利得増幅器。[Claims for Utility Model Registration] The first
a switching means, a first capacitor connected between the selection terminal of the switching means and ground, and a second switching means, the other selected terminal of the first switching means being connected to the one selected terminal. variable resistance means connected between the mutually connected selected terminals of the first and second switching means and the ground, the resistance value of which is controlled by a control signal; a second capacitor connected between the selection terminal and ground; an operational amplifier whose input terminal is connected to the other selected terminal of the second switching means; and between the input terminal and output terminal of the operational amplifier. and a third capacitor connected thereto, the first and second switching means are controlled to switch in conjunction with each other, and electrical connection and disconnection states of each selection terminal and the variable resistance means are alternately repeated. A variable gain amplifier characterized in that the gain is changed by changing the resistance value of the variable resistance means using the control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2675085U JPS61143322U (en) | 1985-02-26 | 1985-02-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2675085U JPS61143322U (en) | 1985-02-26 | 1985-02-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61143322U true JPS61143322U (en) | 1986-09-04 |
Family
ID=30523055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2675085U Pending JPS61143322U (en) | 1985-02-26 | 1985-02-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61143322U (en) |
-
1985
- 1985-02-26 JP JP2675085U patent/JPS61143322U/ja active Pending
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