Oscillators – Solid state active element oscillator – Transistors
Patent
1980-03-20
1982-11-23
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
329122, 331 36C, 331117R, 331177V, 332 30V, H03B 512
Patent
active
043607900
ABSTRACT:
An oscillator arrangement is disclosed which is controllable in its frequency and which comprises a control input for frequency variation and a transformer output, whose frequency-determining oscillating circuit possesses, as a controllable reactive element, two varactor diodes which are connected in opposing fashion and whose capacitance largely represents the oscillating circuit capacitance. Two feedback oscillator circuits are combined to form a push-pull circuit in that the output terminals of the oscillator circuits are connected in respect of d.c. to a reference potential by way of a central tap of the primary winding of a common output transformer. In addition, the two varactor diodes are oppositely poled and interconnected in respect of d.c. by way of the opposite terminals of an oscillating circuit inductance and, at their opposite terminals, are each connected to respective bases of transistors of two oscillator circuits, the emitters of the transistors being connected together and by way of respective resistors to a power supply and the collectors being connected together by way of opposite terminals of the primary winding of the output transformer. In order to form the control input, the oscillating circuit inductance is provided with a central tap.
REFERENCES:
patent: 3020493 (1962-02-01), Carroll
patent: 3397365 (1968-08-01), Kruse, Jr. et al.
patent: 3544919 (1970-12-01), Stratman
patent: 4003004 (1977-01-01), Fletcher et al.
Chow, "Transistor Circuit Engineering", John Wiley & Sons, New York, London, 1957, pp. 221-244.
Grimm Siegfried H.
Siemens Aktiengesellschaft
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