Oscillator circuit

Details Oscillator circuit Oscillator circuit

1987-08-03

1988-08-23

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331143, H03K 326

Patent

active

047663995

ABSTRACT:
An oscillator with noise rejection and a fifty percent duty cycle for the on-chip generation and conversion of a sine wave to a square wave, using an external reference crystal. The circuit comprises a low gain current switch including a first and second switching transistors, with the control lines of the switching transistors connected to a reference voltage line. The reference crystal is connected across the control input and the current receiving terminals of the first transistor so that a square wave is obtained at the current receiving terminal of the second transistor. A threshold circuit is included for adjusting the voltage of the square wave signal from the second transistor and applying the adjusted signal to a diode-coupled receiver circuit, which provides the output for the circuit. This oscillator circuit provides a double action noise immunity through the use of a low gain current switch to prevent noise amplification, in combination with a diode-coupled receiver which is affected by noise only during signal transitions. A duty cycle very close to fifty percent is realized by the circuit.

REFERENCES:
patent: 4122414 (1978-10-01), Patterson, III

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