GB896798A - Improvements in or relating to automatic gain control circuit arrangements - Google Patents

Improvements in or relating to automatic gain control circuit arrangements

Info

Publication number
GB896798A
GB896798A GB26637/58A GB2663758A GB896798A GB 896798 A GB896798 A GB 896798A GB 26637/58 A GB26637/58 A GB 26637/58A GB 2663758 A GB2663758 A GB 2663758A GB 896798 A GB896798 A GB 896798A
Authority
GB
United Kingdom
Prior art keywords
delayed
stages
valve
voltage
resistor
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
GB26637/58A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB896798A publication Critical patent/GB896798A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

  • Control Of Amplification And Gain Control (AREA)

Abstract

896,798. Automatic gain control. PHILIPS ELECTRICAL INDUSTRIES Ltd. Aug. 19, 1958 [Aug. 22, 1957], No. 26637/58. Class 40(5). In a radio receiver an A.G.C. voltage is applied from line 7 to the signal grid of a pentode I.F. amplifier 14 which is provided with an un-bypassed cathode resistor 8 to prevent detuning due to change of input capacity as the grid bias is varied. The A.G.C. voltage for R.F. stages 2 is delayed, being applied from line 18 via resistor 11 to the suppressor grid of valve 14 which is connected to a fixed positive potential via a resistor 10 and acts as a delay diode. The delayed A.G.C. voltage is applied to R.F. stages 2 via line 4. To prevent the application of a positive grid bias to the R.F. stages 2 before the delayed A.G.C. comes into operation, the cathode of the valve 14 is earthed for D.C. by means of a choke 9 of low D.C. resistance and whose A.C. shunting effect on resistor 8 is negligible. The earlier I.F. stages may also be controlled by the delayed A.G.C. voltage. If the valve 14 has more than three grids, a grid other than the third may be used as a delay diode; alternatively a screen surrounding the electrode system of the valve may be used.
GB26637/58A 1957-08-22 1958-08-19 Improvements in or relating to automatic gain control circuit arrangements Expired GB896798A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL896798X 1957-08-22

Publications (1)

Publication Number Publication Date
GB896798A true GB896798A (en) 1962-05-16

Family

ID=19856200

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26637/58A Expired GB896798A (en) 1957-08-22 1958-08-19 Improvements in or relating to automatic gain control circuit arrangements

Country Status (1)

Country Link
GB (1) GB896798A (en)

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