Electronic tuning circuit for AM receiver

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

1987-10-28

1989-07-11

Grimm, Siegfried H.

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

331167, 334 15, 455262, 455318, H03B 508

Patent

active

048475726

ABSTRACT:
In an electronic tuning circuit for AM receiver including a radio-frequency tuning circuit and local oscillator circuit each using a variable capacitance diode, the local oscillator circuit comprises an oscillation coil; a padding capacitor connected in series with the oscillation coil; a first variable capacitance diode connected at one end in series with the oscillation coil; a first and a second fixed capacitor connected at one end in series with each other; and a second variable capacitance diode connected in parallel with the second fixed capacitor. The second fixed capacitor has its other end connected to a connection point between the padding capacitor and the first variable capacitance diode. The first fixed capacitor has its other end connected to the connection point between the oscillation coil and one end of the first variable capacitance diode. A tuning voltage is applied to the first and second variable capacitance diodes, thereby reducing tracking error over the entire receiving frequency band.

REFERENCES:
patent: 3959728 (1976-05-01), Yamazaki et al.
patent: 4593255 (1986-06-01), Matsuura

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