Oscillators – Solid state active element oscillator – Transistors
Patent
1984-10-09
1987-01-20
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331117R, 331135, 331177R, H03B 512, H03B 536
Patent
active
046382631
ABSTRACT:
A voltage controlled oscillator having an electrical means of frequency control which is able to operate from a supply voltage which is lower than is desirable to use with a "VARICAP" diode. The oscillator comprises a pair of transistors whose base and collector electrodes are connected together, the base electrodes being connected to a supply rail and the collector electrodes are connected to a tunable parallel LC resonant circuit. A frequency determining device, e.g. a crystal, is connected between a tapping of the resonant circuit and the emitter of one of the transistors to form a first feedback path. The crystal together with an integratable small value capacitor connected between the emitters of the two transistors form a second feedback path. The phase shifts due to the first and second feedback paths are summed vectorially at the collectors of the two transistors. By varying the gain of each of the two transistors then the resultant phase shift, and thereby the frequency of oscillation, are varied.
REFERENCES:
patent: 2492185 (1949-12-01), Royden
patent: 3763439 (1973-10-01), Peil
Razzell Charles J. H.
Van Rumpt Herman W.
Briody Thomas A.
Grimm Siegfried H.
Oisher Jack
Streeter William J.
U.S. Philips Corporation
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