VHF tuner

Details VHF tuner VHF tuner

1984-04-30

1986-04-08

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455190, 455196, 455319, 455333, 334 15, H04B 126

Patent

active

045817685

ABSTRACT:
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.

REFERENCES:
patent: 3611154 (1971-10-01), Kupfer
patent: 3813615 (1974-05-01), Okazaki
patent: 3825858 (1974-07-01), Amemiya et al.
patent: 3866138 (1975-02-01), Putzer
patent: 3889210 (1975-06-01), Matsuura et al.
patent: 4380827 (1983-04-01), Moon

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