Oscillators – Solid state active element oscillator – Transistors
Patent
1979-02-16
1981-01-06
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331 8, 331 20, 331 34, H03B 512, H03L 708
Patent
active
042439531
ABSTRACT:
A variable-frequency oscillator includes an oscillator portion coupled to a phase shifter and a controllable gain device for controlling the amount of phase-shifted signal reintroduced to the oscillator. The oscillator includes first and second transistors coupled at their emitters to a current source. The emitters of third and fourth transistors are coupled to bases of the first and second transistors, respectively. The base of the third transistor is coupled to a voltage source, and the base of the fourth transistor couples to the collector of the first to form a regenerative loop capable of oscillation. A parallel-resonant circuit is coupled between the collector of the first transistor and the voltage source for establishing a frequency-sensitive phase characteristic in the loop by which the quiescent frequency is determined. The phase shifter is coupled to a point on the regenerative loop. The controllable gain device is coupled to the output of the phase shifter and reinjects a variable-amplitude version of the phase-shifted signal to a second point on the loop for establishing the oscillation frequency.
REFERENCES:
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patent: 3137826 (1964-06-01), Boudrias
patent: 3553459 (1971-01-01), Siedband et al.
patent: 3649929 (1972-03-01), Thompson
patent: 3832656 (1974-08-01), Ito et al.
patent: 4020500 (1977-04-01), Harwood
patent: 4055817 (1977-10-01), Watanabe et al.
Wilcox, "Integrated TV Video Modulation System", IEEE Transactions on Consumer Electronics, Feb. 1977, p. 73.
Balaban Alvin R.
Steckler Steven A.
Brinton Yorks, Jr. W.
Grimm Siegfried H.
Meise William H.
RCA Corporation
Whitacre Eugene M.
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