JPS55147008A - Negative feedback circuit for amplifier - Google Patents
Negative feedback circuit for amplifierInfo
- Publication number
- JPS55147008A JPS55147008A JP5425579A JP5425579A JPS55147008A JP S55147008 A JPS55147008 A JP S55147008A JP 5425579 A JP5425579 A JP 5425579A JP 5425579 A JP5425579 A JP 5425579A JP S55147008 A JPS55147008 A JP S55147008A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- capacitor
- resistors
- negative feedback
- output
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
PURPOSE:To prevent the deterioration of sound quality, by using the capacitor of small capacitance and good quality, by dividing the output of the amplifier through resistors and by negative feedback of the divided signal via a capacitor. CONSTITUTION:The output of the amplifier 2 is fed to the output terminal 3 and also branched into two; one is negative-fed-back to the inverting input terminal of the amplifier 2 via the resistor 8 and another is grounded via the series circuit of negative feedback voltage dividing resistors 4, 5, and negative feedback is made from the junction points of the resistors 4 and 5 to the noninverting input terminal of the amplifier 2 via the capacitor 7. In this circuit, the resistance value R8 of the resistor 8 is taken sufficiently greater value than the resistance values R4, R5 of the resistors 4, 5, and when the impedance of the capacitor 7 at an audible frequency band is regarded as zero, the low band cut-off frequency f3 is f3=1/[2piC(R5.R8)/ (R4+R5)] and the frequency is lower than a multiple of (R4+R5)/R8 in comparison with conventional systems. Accordingly, the degradation of sound quality can easily be prevented by using a capacitor of small capacitance and good quality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5425579A JPS55147008A (en) | 1979-05-02 | 1979-05-02 | Negative feedback circuit for amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5425579A JPS55147008A (en) | 1979-05-02 | 1979-05-02 | Negative feedback circuit for amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55147008A true JPS55147008A (en) | 1980-11-15 |
Family
ID=12965441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5425579A Pending JPS55147008A (en) | 1979-05-02 | 1979-05-02 | Negative feedback circuit for amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55147008A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3903497A1 (en) * | 1989-02-06 | 1990-08-09 | Siemens Ag | Low-noise amplifier circuit |
| DE3941351A1 (en) * | 1989-02-06 | 1991-06-20 | Siemens Ag | Low noise wide band amplifier for video-audio appts. - uses feedback circuits connected to reference potentials to achieve frequency compensation |
| US7061699B2 (en) | 2002-03-28 | 2006-06-13 | Seiko Epson Corporation | Projection lens, producing method of projection lens and projector having projection lens |
-
1979
- 1979-05-02 JP JP5425579A patent/JPS55147008A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3903497A1 (en) * | 1989-02-06 | 1990-08-09 | Siemens Ag | Low-noise amplifier circuit |
| DE3941351A1 (en) * | 1989-02-06 | 1991-06-20 | Siemens Ag | Low noise wide band amplifier for video-audio appts. - uses feedback circuits connected to reference potentials to achieve frequency compensation |
| US7061699B2 (en) | 2002-03-28 | 2006-06-13 | Seiko Epson Corporation | Projection lens, producing method of projection lens and projector having projection lens |
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