Differential oscillator with common mode control

Details Differential oscillator with common mode control Differential oscillator with common mode control

1992-02-06

1992-12-15

Pascal, Robert J.

Oscillators

Solid state active element oscillator

Transistors

331186, H03B 500

Patent

active

051720787

ABSTRACT:
An oscillator circuit uses a differential oscillator and differential amplifier to generate a symmetrical single-ended output signal. The differential oscillator generates a differential oscillator signal having an adjustable zero-crossing point in response to a control signal. The differential amplifier converts the differential oscillator signal to the symmetrical single-ended output signal having a symmetrical waveform. Controlling the zero-crossing of the differential oscillator signal compensates for common mode variation in the differential amplifier and produces a single-ended output signal having a symmetrical waveform with 50% duty cycle. A matching amplifier operating in a self biasing mode produces the control signal.

REFERENCES:
patent: 4152675 (1979-05-01), Jett, Jr.
patent: 4876463 (1989-10-01), Lyle
patent: 5057702 (1991-10-01), Kitagawa

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