Electronic tuning circuit for an AM receiver

Details Electronic tuning circuit for an AM receiver Electronic tuning circuit for an AM receiver

1995-09-11

1997-10-14

Tran, Thai

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551931, 4551804, 455292, H04B 118

Patent

active

056782128

ABSTRACT:
An electronic tuning circuit for an AM radio receiver in which a signal of a specific frequency is selected from the input signal from an antenna is provided, this tuning circuit having a tuning transformer with a first winding and a second winding, the number of turns on the first winding being greater than the number of turns on said second winding, the input from the antenna being applied to the second winding of the tuning transformer, and further having two varactor diodes, each of which is connected in series with a DC-blocking capacitor, these series-connected varactor-capacitor combinations being connected in parallel with the first winding of the tuning transformer such that the polarities of the varactor diodes are mutually opposing.

REFERENCES:
patent: 3931577 (1976-01-01), Barnett
patent: 4048598 (1977-09-01), Knight
patent: 4186350 (1980-01-01), Takayama
patent: 4218774 (1980-08-01), Kondo
patent: 4224471 (1980-09-01), Ogita
patent: 4339827 (1982-07-01), Torres et al.
patent: 4430630 (1984-02-01), Sakamoto
patent: 4742569 (1988-05-01), Yokoyama et al.
patent: 4794650 (1988-12-01), Yokoyama
patent: 4805232 (1989-02-01), Ma
patent: 4837852 (1989-06-01), Takada et al.
patent: 5040239 (1991-08-01), Kondo et al.

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