Antenna tuning circuit for AM radio receiver

Details Antenna tuning circuit for AM radio receiver Antenna tuning circuit for AM radio receiver

1981-02-06

1983-09-06

Lieberman, Eli

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455286, 343728, 343788, H04B 118

Patent

active

044033478

ABSTRACT:
An improved antenna tuning circuit for a long and a medium wave AM radio receiver is disclosed. The antenna tuning circuit of the present invention comprises a tuning coil wound around a ferrite core, a variable capacitor connected in parallel with the tuning coil, and a field effect transistor. One end of the tuning coil is connected to the gate electrode directly or through an impedance means, while the other end of the tuning coil is grounded. The output signal of the antenna tuning circuit is taken out from a selected one of the source or drain electrode of the field effect transistor, whereby the signal to noise ratio may be remarkably improved.

REFERENCES:
patent: 3078348 (1963-02-01), McIntosh
patent: 3570005 (1971-03-01), Rrolss
patent: 3827053 (1974-07-01), Willie et al.
patent: 4052674 (1977-10-01), Miyamoto
patent: 4263676 (1981-04-01), Liebel

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