GB1036182A - Improvements in or relating to amplifiers provided with negative feedback - Google Patents
Improvements in or relating to amplifiers provided with negative feedbackInfo
- Publication number
- GB1036182A GB1036182A GB939064A GB939064A GB1036182A GB 1036182 A GB1036182 A GB 1036182A GB 939064 A GB939064 A GB 939064A GB 939064 A GB939064 A GB 939064A GB 1036182 A GB1036182 A GB 1036182A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impedance
- resistor
- amplifier
- output
- transistor
- 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.)
- Expired
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
1,036,182. Transistor amplifying circuits. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. March 5, 1964 [March 8, 1963], No. 9390/64. Heading H3T. [Also in Division G5] In an amplifier in which the output terminals are shunted by an additional circuit presenting a non-linear or variable impedance the additional circuit is connected to the output terminals via a series impedance and the junction of the series impedance and additional circuit is connected to a feedback path having a feedback factor such that the signal appearing across the output terminals is independent of the impedance of the additional circuit. In an em bodiment, e.g. a magnetic tape recorder, in which transistor 4 feeds recording head 6 via series resistor 5 and the recording level is monitored by means of rectifier-fed meter 8, distortion of the output due to the rectifier is prevented by connecting resistor R1 in series with it and taking negative feedback from the junction point to the base of the transistor over resistor 9. It is shown in the Specification that the necessary condition is for the feedback factor to equal the output impedance of the amplifier with open output circuit, divided by the impedance of resistor R1 and also the gain of the amplifier with open output circuit. The output impedance of the amplifier may be reduced by means of an additional feedback; e.g. a resistor is provided between collector and base of the transistor. In addition, any frequencydependence of the amplification of the amplifier may be compensated for by replacement of resistor R1 or 9 by a corresponding impedance network.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEN22858A DE1206024B (en) | 1963-03-08 | 1963-03-08 | Counter-coupled amplifier for non-linear load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1036182A true GB1036182A (en) | 1966-07-13 |
Family
ID=7342355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB939064A Expired GB1036182A (en) | 1963-03-08 | 1964-03-05 | Improvements in or relating to amplifiers provided with negative feedback |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT241531B (en) |
| BE (1) | BE644929A (en) |
| CH (1) | CH414752A (en) |
| DE (1) | DE1206024B (en) |
| GB (1) | GB1036182A (en) |
-
1963
- 1963-03-08 DE DEN22858A patent/DE1206024B/en active Pending
-
1964
- 1964-03-05 GB GB939064A patent/GB1036182A/en not_active Expired
- 1964-03-05 CH CH287964A patent/CH414752A/en unknown
- 1964-03-05 AT AT190064A patent/AT241531B/en active
- 1964-03-09 BE BE644929A patent/BE644929A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH414752A (en) | 1966-06-15 |
| AT241531B (en) | 1965-07-26 |
| DE1206024B (en) | 1965-12-02 |
| BE644929A (en) | 1964-09-09 |
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