AM receiver with controllable RF input circuit

Details AM receiver with controllable RF input circuit AM receiver with controllable RF input circuit

2006-12-26

2006-12-26

Nguyen, Duc (Department: 2617)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S182100, C455S186200, C455S230000

Reexamination Certificate

active

07155186

ABSTRACT:
AM receiver comprising an RF input circuit for receiving an RF AM signal, demodulation means providing an audio signal carried by said RF AM signal as well as automatic gain control means for stabilising an RF carrier dependent DC level at the output of said demodulation means at a substantially fixed stabilisation value. In order to improve the receiver performance in particular at low values of the RF reception fieldstrength, the RF input circuit is being provided with a cascade of N tuneable resonance amplifiers being tuned to said RF AM signal, said automatic gain control means controlling at least one of said cascade of N resonance amplifiers to increase in both gain and selectivity at a decrease of the fieldstrength of said RF input signal.

REFERENCES:
patent: 5041793 (1991-08-01), Gailus
patent: 5220686 (1993-06-01), Kasperkovitz et al.
patent: 5270916 (1993-12-01), Sexton et al.
patent: 5417221 (1995-05-01), Sickler

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