JPH0172719U - - Google Patents
Info
- Publication number
- JPH0172719U JPH0172719U JP1987166769U JP16676987U JPH0172719U JP H0172719 U JPH0172719 U JP H0172719U JP 1987166769 U JP1987166769 U JP 1987166769U JP 16676987 U JP16676987 U JP 16676987U JP H0172719 U JPH0172719 U JP H0172719U
- Authority
- JP
- Japan
- Prior art keywords
- decoder
- bits
- gain
- resistance value
- operational 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
- 238000006243 chemical reaction Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Control Of Amplification And Gain Control (AREA)
Description
第１図および第２図は本考案の実施例を示し、
第１図は主回路の回路図、第２図はクロスポイン
トスイツチのブロツク図、第３図は従来例の回路
図である。
０〜１５……アナログスイツチ、２１……デコ
ーダ、Ａ……演算増幅器、Ｒ３１，Ｒ４１〜Ｒ４
３，Ｒ５１〜Ｒ５４……抵抗器、Ｂ０〜Ｂ３……
ビツト、Ｘ０〜Ｘ３，Ｙ０〜Ｙ３……母線。
1 and 2 show an embodiment of the present invention,
FIG. 1 is a circuit diagram of the main circuit, FIG. 2 is a block diagram of a cross-point switch, and FIG. 3 is a circuit diagram of a conventional example. 0 to 15...Analog switch, 21...Decoder, A...Operation amplifier, R31 , R41 to R4
3 , R51 to R54 ...Resistor, B0 to B3 ...
Bits, X0 to X3 , Y0 to Y3 ... Bus line.
Claims (1)
幅器の利得を変化させるレベル変換回路において
、複数ビツトからなる２進コードの信号を１０進
数の信号へ変換するデコーダと、各々が前記複数
ビツトと対応する数のＸ，Ｙ両母線およびこれら
の交差点を接続しかつ前記デコーダの出力により
駆動されるアナログスイツチからなるクロスポイ
ントスイツチと、前記アナログスイツチの接続に
したがい合成抵抗値が変化し利得を前記２進コー
ドに応じて定める互いに直列として接続された複
数の帰還用抵抗器とを備えたことを特徴とするレ
ベル変換回路。 A level conversion circuit that adjusts a feedback resistance value of an operational amplifier to change the gain of the operational amplifier includes a decoder that converts a binary code signal consisting of a plurality of bits into a decimal signal, each corresponding to the plurality of bits. A cross point switch consists of a number of X and Y bus lines and an analog switch connected to the intersections thereof and driven by the output of the decoder, and the combined resistance value changes according to the connection of the analog switch, and the gain is 1. A level conversion circuit comprising a plurality of feedback resistors connected in series with each other and determined according to a base code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987166769U JPH0172719U (en) | 1987-11-02 | 1987-11-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987166769U JPH0172719U (en) | 1987-11-02 | 1987-11-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0172719U true JPH0172719U (en) | 1989-05-16 |
Family
ID=31454448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987166769U Pending JPH0172719U (en) | 1987-11-02 | 1987-11-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0172719U (en) |
-
1987
- 1987-11-02 JP JP1987166769U patent/JPH0172719U/ja active Pending
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