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VHF-tuner

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VHF tuner

Details

Inventors: Aoki, Kazuharu; Saito, Masahiko;
Assignee: Alps Electric Co., Ltd. (JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

In a VHF tuner, feedback capacitance between the emitter of a local oscillating transistor and the ground in a local oscillator is changed at the low band receiving state and high band receiving state by controlling a switching diode connected in series to a capacitor for feedback capacitance and, a mixer is installed to mix the output of the local oscillator and high frequency input. For an improved mixer biasing circuit, the switching diode in series connection to the capacitor for feedback capacitance is connected to one terminal of a mixing FET in the mixer, and changing of the feedback capacitance in the local oscillator is accompanied by changing of working current of the mixing FET in the local oscillator.

DETAILED DESCRIPTION In order to eliminate the above-mentioned diasdvantages of the prior art, an object of the present invention is to provide a VHF tuner in which on-off control of a switching diode to change feedback capacitance is facilitated by simple constitution that the switching diode is not directly grounded but connected to one terminal of a mixing FET.
Another object of the invention is to provide a VHF tuner in which feedback capacitance is changed at low band receiving state and high band receiving state and also bias of a mixer is changed thereby conversion gain of required amount is obtained and distorsion is prevented from occurring in the mixer.

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