GB953918A - Improvements in or relating to circuit arrangements for limiting modulated electrical signals - Google Patents
Improvements in or relating to circuit arrangements for limiting modulated electrical signalsInfo
- Publication number
- GB953918A GB953918A GB1612660A GB1612660A GB953918A GB 953918 A GB953918 A GB 953918A GB 1612660 A GB1612660 A GB 1612660A GB 1612660 A GB1612660 A GB 1612660A GB 953918 A GB953918 A GB 953918A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- circuit
- zener diode
- condenser
- base
- 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
- 238000010079 rubber tapping Methods 0.000 abstract 2
- 238000013016 damping Methods 0.000 abstract 1
- 230000001629 suppression Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/24—Automatic control in frequency-selective amplifiers
- H03G5/28—Automatic control in frequency-selective amplifiers having semiconductor devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/002—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general without controlling loop
-
- 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
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Dc-Dc Converters (AREA)
Abstract
953,918. Transistor limiting circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. May 6, 1960 [May 9, 1959], No. 16126/60. Addition to 847,571. Heading H3T. In a limiter circuit comprising a parallel resonant circuit 1, Fig. 1, a symmetrical transistor 2 with its emitter-collector path connected across all or a part of the tuned circuit, and a parallel-connected resistor 4 and condenser 5 connected between the base of the transistor and a tapping on the resonant circuit midway between the connection thereto of the emitter and collector of the transistor, means are provided for supplying a current in the circuit between the tapping and the base of the transistor in opposition to the conduction direction of the base of the transistor. The means for supplying current comprise a battery 6 and current-limiting resistor 7. The arrangement reduces the damping imposed on the tuned circuit by the transistor at low signal levels. The resistor and condenser combination and biasing arrangement may be replaced by (Fig. 2, not shown) or connected in series with a suitably poled Zener diode. The Zener diode 10, Fig. 3, may be so connected as to apply automatic gain control to a preceding I.F. stage 11 when conductive; the time-constant provided by the condenser 12 may be made short so that the gain control circuit itself provides suppression of amplitude modulation. The Zener diode may be combined with the transistor (Fig. 4, not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEN16692A DE1102835B (en) | 1959-05-09 | 1959-05-09 | Circuit arrangement for suppressing an increase in voltage of the high-frequency oscillations in a parallel resonant circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
GB953918A true GB953918A (en) | 1964-04-02 |
Family
ID=7340261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1612660A Expired GB953918A (en) | 1959-05-09 | 1960-05-06 | Improvements in or relating to circuit arrangements for limiting modulated electrical signals |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1102835B (en) |
GB (1) | GB953918A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1211268B (en) * | 1961-12-21 | 1966-02-24 | Standard Elektrik Lorenz Ag | Transistor stage with limited output level |
DE1288167B (en) * | 1964-03-03 | 1969-01-30 | Danfoss As | Protection circuit for a tube transmitter |
-
1959
- 1959-05-09 DE DEN16692A patent/DE1102835B/en active Pending
-
1960
- 1960-05-06 GB GB1612660A patent/GB953918A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1102835B (en) | 1961-03-23 |
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