Tuning circuit and receiver

Details Tuning circuit and receiver Tuning circuit and receiver

1989-08-23

1991-08-13

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455195, 455183, 334 12, H04B 118

Patent

active

050402390

ABSTRACT:
In a tuning circuit, use is made of a current-controlled type variable inductor comprising a tuning coil and a control coil for controlling the magnetic flux density of the tuning coil. The tuning coil is connected in series with the antenna; a tuning capacitor is connected to each end of tuning coil; and by controlling a current flowing through the control coil, magnetic flux induced in the tuning coil is increased, decreased or cancelled so that the magnetic flux density of the tuning coil is adjusted to control the inductance thereof, thereby permitting the tuning circuit to be tuned to any desired frequency in the receiving frequency band.

REFERENCES:
patent: 3571716 (1971-03-01), Hill et al.
patent: 3579115 (1971-05-01), Goncharoff et al.
patent: 3600684 (1971-08-01), Cherry
patent: 4403347 (1983-09-01), Iso et al.
patent: 4450588 (1984-05-01), Pohrich et al.
patent: 4630013 (1986-12-01), Takada
patent: 4725805 (1988-02-01), Takada
patent: 4739517 (1988-04-01), Okanobu
patent: 4748683 (1988-05-01), Sato

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