GB1015095A - Selective amplifier gain control arrangement - Google Patents

Selective amplifier gain control arrangement

Info

Publication number
GB1015095A
GB1015095A GB325363A GB325363A GB1015095A GB 1015095 A GB1015095 A GB 1015095A GB 325363 A GB325363 A GB 325363A GB 325363 A GB325363 A GB 325363A GB 1015095 A GB1015095 A GB 1015095A
Authority
GB
United Kingdom
Prior art keywords
impedance
diode
circuit
resistor
gain control
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
Application number
GB325363A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB1015095A publication Critical patent/GB1015095A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes

Abstract

1,015,095. Automatic gain control. STANDARD TELEPHONES & CABLES Ltd. Jan. 25, 1963 [Jan. 31, 1962], No. 3253/63. Heading H3T. A selective amplifier gain control circuit comprises a tuned circuit 3, 4 connected to one end of a variable attenuator, which comprises a series diode 5 and a shunt diode 6 which is in series with a resistor 15 of a value substantially. equal to the value of the terminating impedance 14 of the attenuator at the other end, the attenuation being variable without varying the impedance presented to the tuned circuit by control potentials applied to the diodes. In the Figure impedance 14 is that of the input of an amplifier stage and diodes 5, 6 are biased by resistor chain 9, 10, 11. With a small control voltage, diode 5 conducts and diode 6 is blocked, so that the impedance 14 is presented to the tuned circuit. A large control voltage saturates transistor 13 and causes diode 5 to become high impedance and diode 6 to present impedance 15 to the tuned circuit. The circuit may be used in the reverse direction in which case impedance 14 is that of the signal source, e.g. an amplifier or a cable. Greater sensitivity may be obtained by connecting the right-hand side of resistor 11 to a resistor in the collector circuit of 13.
GB325363A 1962-01-31 1963-01-25 Selective amplifier gain control arrangement Expired GB1015095A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST18812A DE1227522B (en) 1962-01-31 1962-01-31 Circuit arrangement for gain control of selective amplifiers

Publications (1)

Publication Number Publication Date
GB1015095A true GB1015095A (en) 1965-12-31

Family

ID=7457990

Family Applications (1)

Application Number Title Priority Date Filing Date
GB325363A Expired GB1015095A (en) 1962-01-31 1963-01-25 Selective amplifier gain control arrangement

Country Status (2)

Country Link
DE (1) DE1227522B (en)
GB (1) GB1015095A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4996855U (en) * 1972-12-13 1974-08-21
GB2266422A (en) * 1992-04-22 1993-10-27 Pioneer Electronic Corp Attenuators

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2126136C3 (en) * 1971-05-26 1982-07-29 Blaupunkt-Werke Gmbh, 3200 Hildesheim Adjustable HF input stage with a PIN diode attenuator
DE2260072C3 (en) * 1972-12-08 1981-10-08 Saba Gmbh, 7730 Villingen-Schwenningen Circuit arrangement for attenuating the antenna signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4996855U (en) * 1972-12-13 1974-08-21
GB2266422A (en) * 1992-04-22 1993-10-27 Pioneer Electronic Corp Attenuators
GB2266422B (en) * 1992-04-22 1995-09-06 Pioneer Electronic Corp Attenuator for a receiver

Also Published As

Publication number Publication date
DE1227522B (en) 1966-10-27

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