GB595008A - Improvement in automatic gain control - Google Patents
Improvement in automatic gain controlInfo
- Publication number
- GB595008A GB595008A GB3368/45A GB336845A GB595008A GB 595008 A GB595008 A GB 595008A GB 3368/45 A GB3368/45 A GB 3368/45A GB 336845 A GB336845 A GB 336845A GB 595008 A GB595008 A GB 595008A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- grid
- pulses
- gain control
- resistance
- 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
- 230000001419 dependent effect Effects 0.000 abstract 2
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/04—Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Control Of Amplification And Gain Control (AREA)
- Circuits Of Receivers In General (AREA)
- Amplifiers (AREA)
Abstract
595,008. Automatic gain control. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Feb. 9, 1945, No. 3368. Convention date, Jan. 28, 1942. [Class 40 (v)] An automatic gain control circuit for removing very low-frequency signal amplitude variations and also comparatively high-frequency variations, for example in a rotating radio beacon receiver, such as that described in Specification 503,717, comprises a rectifier producing voltage pulses which are clipped at a level depending on amplitude variations in the pulses and applied as gain control voltage to a preceding amplifier. In one embodiment, Fig. 1, a pentode signal amplifier 10 feeds a full-wave rectifier producing, across its load resistance 16, half-wave pulses e as shown in Fig. 2a. The positive end of 16 is connected through resistance 22 to the anode of a triode valve 17 and its negative end to the cathode, the grid being earthed. A condenser 24 is connected between anode and grid, and resistance 26 between grid and cathode. The A.G.C. voltage is developed at the cathode and is fed through a short time-constant filter 28, 29 to a grid of valve 10. When a pulse is applied to valve 17, grid current flows for part of the time during which the A.G.C. voltage across resistance 26 remains constant and condenser 24 becomes charged to a voltage depend - ing on the pulse amplitude. During the next pulse, the flow of grid current commences at a signal voltage dependent on the voltage to which condenser 24 is charged during the preceding pulse. The resulting output voltage is as shown at e1, Fig. 2b, which is smoothed as at x by the filter 28, 29. If the anode is earthed instead of the grid, the resulting A.G.C. voltage is of the waveform shown in Fig. 2c. In a second embodiment, Fig. 3 (not shown), the rectified signal pulses are applied to the anodes of a symmetrical multivibrator and the square output pulses at the two multivibrator anodes are combined to produce a voltage similar to that in Fig. 2b, the amplitude being dependent on the signal voltage.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US428538A US2406433A (en) | 1942-01-28 | 1942-01-28 | Automatic gain control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB595008A true GB595008A (en) | 1947-11-25 |
Family
ID=23699311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3368/45A Expired GB595008A (en) | 1942-01-28 | 1945-02-09 | Improvement in automatic gain control |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2406433A (en) |
| GB (1) | GB595008A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2466229A (en) * | 1944-04-21 | 1949-04-05 | Stromberg Carlson Co | Automatic gain control system |
| US2708717A (en) * | 1951-09-25 | 1955-05-17 | Rca Corp | Wave shaping circuits |
-
1942
- 1942-01-28 US US428538A patent/US2406433A/en not_active Expired - Lifetime
-
1945
- 1945-02-09 GB GB3368/45A patent/GB595008A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2406433A (en) | 1946-08-27 |
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