Control loop for reducing the time of repsonse of a tuner-AGC of

Details Control loop for reducing the time of repsonse of a tuner-AGC of Control loop for reducing the time of repsonse of a tuner-AGC of

1991-01-15

1993-11-16

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552441, 4552511, H04B 116

Patent

active

052631869

ABSTRACT:
In a dynamic automatic loop for control of the overall gain of an input circuit of a superheterodyne receiver, the response time of the HF-AGC circuit of the TUNER, in response to the action of the TUNER DELAY circuit activated by the IF-AGC in the case of autonomously uncontrollable abrupt increases in the level of the antenna signal from the same HF-AGC of the TUNER, is markedly reduced using an additional TUNER DELAY PLUS circuit able to absorb for a determined interval of time, a discharge current from the storage capacitor the control voltage of the HF-AGC in addition to the discharge current absorbed by the existing TUNER DELAY circuit. The relevant intensity of this additional discharge current and its duration are optimized by way of suitable circuital arrangements in the design of said TUNER DELAY PLUS circuit. The response time is reduced without modifying the time constant of the HF-AGC, which cannot be freely reduced because of inter- and cross-modulation problems.

REFERENCES:
patent: 3154740 (1964-10-01), Eness
patent: 3230458 (1966-01-01), Stangeland
patent: 4013964 (1977-03-01), Skutta
patent: 4761687 (1988-08-01), Rumreich
patent: 4827511 (1989-05-01), Masuko
Willigen D. V., "Automatic Input Attenuator for HF Communication Receivers", The Radio and Electronic Engineer, vol. 47, No. 10, pp. 465-469, Oct. 1977.

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