Voltage controlled oscillator presenting high impedance to paral

Details Voltage controlled oscillator presenting high impedance to paral Voltage controlled oscillator presenting high impedance to paral

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:
patent: 3054967 (1962-09-01), Gindi
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.

Affiliated with

Also associated with

Rating

Voltage controlled oscillator presenting high impedance to paral does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Voltage controlled oscillator presenting high impedance to paral, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Voltage controlled oscillator presenting high impedance to paral will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-287631