Oscillators – Solid state active element oscillator – Transistors
Patent
1983-10-13
1986-01-14
LaRoche, Eugene R.
Oscillators
Solid state active element oscillator
Transistors
331177V, 332 30V, 334 15, 334 78, 455262, H03B 512, H03C 320, H03H 512, H03J 320
Patent
active
045648220
ABSTRACT:
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 capacitor (17) is connected between a junction of a tuning diode (10) and a correcting capacitor (11) connected in series therewith and the emitter of an oscillation transistor (1). 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 capacitance 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 capacitance value or vice versa.
REFERENCES:
patent: 3103637 (1963-09-01), Pan
patent: 3370254 (1968-02-01), Keller
patent: 3889210 (1975-06-01), Matsuura et al.
Hatashita Hiroshi
Saitoh Takeshi
Hitachi , Ltd.
LaRoche Eugene R.
Mis D. C.
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