H - Electricity – 03 – J
Patent
H - Electricity
03
J
331/64, 365/9
H03J 3/18 (2006.01) H03B 5/12 (2006.01) H04N 5/44 (2006.01) H03B 1/00 (2006.01)
Patent
CA 1215145
ABSTRACT OF THE DISCLOSURE An oscillator circuit suitable for use in a local oscillator of a tuner of a television receiver set. A feedback circuit comprised of a feedback capaci- tor is connected between a junction of a tuning diode and a correcting capacitor connected in series therewith and the emitter of an oscillation transistor. Oscillation voltage developing across the correcting capacitor is fedback to the emitter of the oscillation transistor through the feedback capacitor. When the tuning diode is conditioned to have a large capacitance value, a large oscillation voltage is fedback to the transistor through the feedback capacitor whereas when the tuning diode is conditioned to have a small capaci- tance value, a small oscillation voltage is fedback to the transistor through the feedback capacitor. The oscillator circuit continues to oscillate stably over a wide frequency range whenever the tuning diode changes from the small capacitance value to the large capaci- tance value or vice versa.
438879
Hatashita Hiroshi
Saitoh Takeshi
Gowling Lafleur Henderson Llp
Hitachi Ltd.
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