Double tuning circuit of TV tuner

Details Double tuning circuit of TV tuner Double tuning circuit of TV tuner

1996-12-04

1998-10-13

Gensler, Paul

Tuners

With switching means

334 55, 4551802, 4551882, H03J 500

Patent

active

058218386

ABSTRACT:
The double tuning circuit of a TV tuner provided by the present invention comprises a primary tuning circuit and a secondary tuning circuit coupled with each other wherein at least one of the primary and secondary tuning circuits comprises two series circuits connected to each other in parallel with each of the two series circuits including damping resistors and/or resonance capacitors in addition to switching diodes which are each selectively turned on and off by using a predetermined switching voltage corresponding to signal reception states so that the frequency response of an intermediate-frequency signal obtained on the output side of the double tuning circuit is fixed independently of a channel receiving the incoming signal and the intensity of the electric field of the incoming signal.

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