JPH0253629U - - Google Patents
Info
- Publication number
- JPH0253629U JPH0253629U JP13136788U JP13136788U JPH0253629U JP H0253629 U JPH0253629 U JP H0253629U JP 13136788 U JP13136788 U JP 13136788U JP 13136788 U JP13136788 U JP 13136788U JP H0253629 U JPH0253629 U JP H0253629U
- Authority
- JP
- Japan
- Prior art keywords
- input
- circuit
- capacitors
- amplifier
- differential 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims 6
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Networks Using Active Elements (AREA)
- Amplifiers (AREA)
Description
第１図乃至第４図はこの考案に係る低周波増幅
器の入力回路の実施例を示し、第１図は低周波増
幅器として例えば音響増幅器のフオノイコライザ
回路を示した回路図、第２図はこの音響増幅器の
動作を説明するための回路図、第３図は入力イン
ピーダンスの周波数特性を示した特性図、第４図
は他の実施例を示した低周波増幅器の回路図であ
る。第５図は従来例の低周波増幅器の回路図であ
る。
主な符号の説明、１：入力端子、２：出力端子
、３：ＲＩＡＡ回路、４：演算増幅器、１０：こ
の考案の増幅器の特性曲線、１１：従来例の増幅
器の特性曲線、２０：他の実施例の差動増幅器、
Ｑ１，Ｑ２：差動増幅器。
1 to 4 show an embodiment of the input circuit of a low frequency amplifier according to this invention, FIG. 1 is a circuit diagram showing a phono equalizer circuit of an acoustic amplifier as a low frequency amplifier, and FIG. 2 is a circuit diagram of this example. FIG. 3 is a circuit diagram for explaining the operation of the acoustic amplifier, FIG. 3 is a characteristic diagram showing the frequency characteristics of input impedance, and FIG. 4 is a circuit diagram of a low frequency amplifier showing another embodiment. FIG. 5 is a circuit diagram of a conventional low frequency amplifier. Explanation of main symbols, 1: Input terminal, 2: Output terminal, 3: RIAA circuit, 4: Operational amplifier, 10: Characteristic curve of the amplifier of this invention, 11: Characteristic curve of the conventional amplifier, 20: Other Example differential amplifier,
Q 1 , Q 2 : Differential amplifier.
Claims (1)
デンサとインダクタンスを用いた入力フイルタ回
路を形成して、高周波妨害電流を排除した低周波
増幅器の入力回路において、 上記入力フイルタ回路の第２のコンデンサを直
列接続した第３及び第４のコンデンサに置換し、
この第３及び第４のコンデンサの直列接続の一端
を差動増幅器の非反転入力に接続し、他の一端を
接地するとともに、この第３及び第４のコンデン
サの直列接続の中点より抵抗を介して差動増幅器
の反転入力に接続して構成したことを特徴とする
低周波増幅器の入力回路。 ２ 上記入力フイルタ回路のインダクタンスの代
りに抵抗を用い、更に差動増幅器の非反転入力と
反転入力間に第５のコンデンサを接続して構成し
たことを特徴とする請求項１記載の低周波増幅器
の入力回路。[Claims for Utility Model Registration] 1. In the input circuit of a low frequency amplifier in which high frequency interference current is eliminated by forming an input filter circuit using first and second capacitors and inductance in the input circuit of the differential amplifier, replacing the second capacitor of the input filter circuit with third and fourth capacitors connected in series,
One end of the series connection of the third and fourth capacitors is connected to the non-inverting input of the differential amplifier, the other end is grounded, and a resistor is connected from the midpoint of the series connection of the third and fourth capacitors. An input circuit for a low frequency amplifier, characterized in that the input circuit is connected to an inverting input of a differential amplifier through the inverting input circuit. 2. The low frequency amplifier according to claim 1, wherein a resistor is used in place of the inductance of the input filter circuit, and a fifth capacitor is further connected between the non-inverting input and the inverting input of the differential amplifier. input circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988131367U JPH0540576Y2 (en) | 1988-10-08 | 1988-10-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988131367U JPH0540576Y2 (en) | 1988-10-08 | 1988-10-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0253629U true JPH0253629U (en) | 1990-04-18 |
| JPH0540576Y2 JPH0540576Y2 (en) | 1993-10-14 |
Family
ID=31387367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988131367U Expired - Lifetime JPH0540576Y2 (en) | 1988-10-08 | 1988-10-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0540576Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2023074039A (en) * | 2021-11-17 | 2023-05-29 | エイブリック株式会社 | integration circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51145836U (en) * | 1975-05-17 | 1976-11-24 | ||
| JPS6173497A (en) * | 1984-09-19 | 1986-04-15 | Matsushita Electric Ind Co Ltd | Equalizer amplifier input circuit |
-
1988
- 1988-10-08 JP JP1988131367U patent/JPH0540576Y2/ja not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51145836U (en) * | 1975-05-17 | 1976-11-24 | ||
| JPS6173497A (en) * | 1984-09-19 | 1986-04-15 | Matsushita Electric Ind Co Ltd | Equalizer amplifier input circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2023074039A (en) * | 2021-11-17 | 2023-05-29 | エイブリック株式会社 | integration circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0540576Y2 (en) | 1993-10-14 |
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