GB1473345A - Automatic gain control circuit - Google Patents
Automatic gain control circuitInfo
- Publication number
- GB1473345A GB1473345A GB1763974A GB1763974A GB1473345A GB 1473345 A GB1473345 A GB 1473345A GB 1763974 A GB1763974 A GB 1763974A GB 1763974 A GB1763974 A GB 1763974A GB 1473345 A GB1473345 A GB 1473345A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control signal
- amplifier
- gain control
- output
- automatic gain
- 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
- 239000003990 capacitor Substances 0.000 abstract 3
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 238000009499 grossing Methods 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
- H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
- H03G3/3015—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable using diodes or transistors
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
1473345 Automatic gain control OLYMPUS OPTICAL CO Ltd 23 April 1974 [26 April 1973 1 May 1973 22 Aug 1973 24 Aug 1973] 17639/74 Heading H4R In an automatic gain control circuit an f.e.t. 121 is connected in series with the input coupling capacitor 13 of an amplifier 14 with a gain control signal, derived from the output of the amplifier by a circuit including a smoothing capacitor 153, fed to the gate of the f.e.t. A resistor 122 is connected to the output side of the f.e.t. to provide a low resistance charge or discharge path for coupling capacitor 13 to prevent a low frequency oscillation in the gain of the amplifier on first switch on. The resistor may be connected from the output to earth as shown, or from source to drain, Fig. 4 (not shown). A number of f.e.t.'s may be connected in series and brought into operation one after the other, Fig. 6 (not shown). A bipolar transistor may have its collector emitter path connected from the output terminal of f.e.t. 121 to provide additional control variation, fed with either the same control signal or an oppositely poled control signal depending on the relative conductivity types of the f.e.t. and bipolar transistor, Figs. 8 and 10 (not shown). A switch may be provided to earth the control signal line during replay in a record replay amplifier system to prevent surges when switching to record Fig. 11 (not shown).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5093673U JPS49150210U (en) | 1973-04-26 | 1973-04-26 | |
| JP5171773U JPS5744490Y2 (en) | 1973-05-01 | 1973-05-01 | |
| JP9848573U JPS5044125U (en) | 1973-08-22 | 1973-08-22 | |
| JP9920273U JPS5044523U (en) | 1973-08-24 | 1973-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1473345A true GB1473345A (en) | 1977-05-11 |
Family
ID=27462564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1763974A Expired GB1473345A (en) | 1973-04-26 | 1974-04-23 | Automatic gain control circuit |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2420502A1 (en) |
| GB (1) | GB1473345A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5531368A (en) * | 1978-08-29 | 1980-03-05 | Fujitsu Ltd | Transmission amount control circuit |
| US4349787A (en) * | 1979-02-09 | 1982-09-14 | Novanex Automation N.V. | Compressor |
| DE3207945A1 (en) * | 1982-03-05 | 1983-09-15 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Controllable radio-frequency amplifier |
| CA1201797A (en) * | 1983-01-20 | 1986-03-11 | Frederick H.K. Rambow | Circuit for controlling the magnitude of amplification of signals produced by a borehole televiewer |
-
1974
- 1974-04-23 GB GB1763974A patent/GB1473345A/en not_active Expired
- 1974-04-25 DE DE19742420502 patent/DE2420502A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2420502A1 (en) | 1974-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1261211A (en) | Improvements in timed shared amplifiers | |
| US3264569A (en) | Transiently regenerative amplifier with a. c. and d. c. regeneration | |
| GB1497730A (en) | Pulse width modulated signal amplifier arrangements | |
| GB1458545A (en) | Window detector circuit | |
| GB1473345A (en) | Automatic gain control circuit | |
| US3033998A (en) | Pulse former | |
| GB1306847A (en) | Dual mode deflection amplifier | |
| GB1290597A (en) | ||
| GB1486517A (en) | Phase detector | |
| GB1083978A (en) | Solid state modulator amplifier circuits | |
| GB1350877A (en) | Sense amplifier for high speed memory system | |
| US3441749A (en) | Electronic clamp | |
| GB1388544A (en) | Video output amplifier | |
| JPS5761336A (en) | Output protection circuit of integrated injection logical circuit | |
| GB1470456A (en) | Automatic gain control circuits | |
| GB1228412A (en) | ||
| US3757223A (en) | Circuit connecting device | |
| GB1380505A (en) | Peak detector circuit | |
| GB1372794A (en) | Automatic gain control circuits | |
| GB1108070A (en) | Improvements in or relating to receivers with automatic gain control means | |
| GB1399530A (en) | Compound transistors | |
| GB1493264A (en) | Automatic gain control circuit | |
| US3569738A (en) | Threshold sense amplifier for small signal input | |
| GB1279329A (en) | A supervisory arrangement for a telegraph line | |
| GB1304298A (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |