Oscillators – Negative resistance or negative transconductance oscillator
Patent
1976-06-09
1978-05-23
Grimm, Siegfried H.
Oscillators
Negative resistance or negative transconductance oscillator
331108D, 331140, 331167, 333 80R, H03B 526
Patent
active
040913406
ABSTRACT:
The invention relates to electrical oscillators arranged to oscillate so as to produce a substantially sinusoidal output signal. The said oscillator includes a general impedance transvertor circuit arrangement having two differential amplifiers connected only to a plurality of resistive and capacitive impedance elements and arranged to simulate a tuned circuit with sufficient feedback to maintain oscillation within the tuned circuit. The transvertor circuit is an active device in the form of an impedance invertor circuit or a convertor circuit.
REFERENCES:
patent: 3539943 (1970-11-01), Sheahan
patent: 3562678 (1971-02-01), Antoniou
patent: 3573647 (1971-04-01), Antoniou
Davies, "The Significance of Nullators, Norators and Nullors in Active-Network Theory", The Radio and Electronic Engineeer, Nov. 1967, pp. 259-267.
Riordan, "Simulated Inductors Using Differential Amplifiers", Electronics Letters, Feb. 1967, vol. 3, No. 2, pp. 50-51.
Greaves Alan John
Greenaway Phillip Ernest
Rollett John Mortimer
Grimm Siegfried H.
The Post Office
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