Voltage controlled oscillator free from free-run oscillating fre

Details Voltage controlled oscillator free from free-run oscillating fre Voltage controlled oscillator free from free-run oscillating fre

1989-04-19

1990-04-03

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331177R, H03B 530

Patent

active

049144065

ABSTRACT:
A voltage controlled oscillator free from free-run oscillating frequency adjustment is disclosed. This oscillator includes an amplifier having a positive feedback loop, a resonator connected to the output of the amplifier, and a variable reactance circuit connected to the output of the amplifier. The reactance circuit presents a reactance value variable by a control voltage to control an oscillation frequency of the oscillator. There is a further provided a low-pass filter which is connected in cascade to the variable reactance circuit. A high-pass filter is preferably inserted in the positive feedback loop.

REFERENCES:
patent: 3986145 (1976-10-01), Hongu et al.
patent: 4745375 (1988-05-01), Suzuki

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