CMOS oscillator

Details CMOS oscillator CMOS oscillator

1990-04-03

1991-06-04

Pascal, Robert J.

Oscillators

Solid state active element oscillator

Transistors

331143, H03B 524

Patent

active

050217500

ABSTRACT:
A high-speed, temperature- and parameter-stable, controllable CMOS oscillator is suitable for low to very high frequencies, e.g., clearly above 100 MHz. The oscillator includes a two-stage differential amplifier (D) and two controlled current sources (I1, I2) which are interconnected via a frequency-determining capacitor (C). The two current sources (I1, I2) are connected to the inputs (IN1, IN2) of the differential amplifer (D) through a first resistor (R1) and a second resistor (R2), respectively. By means of a first switching unit (S1) connected to the inputs of the differential amplifier (D), a first current path is completed in response to the voltage drop across the first resistor (R1) to charge the capacitor to a first state, and by means of a second switching unit (S2), a second current path is completed in response to the voltage drop across the second resistor (R2) to discharge the capacitor (C) to a second state.

REFERENCES:
patent: 4083020 (1978-04-01), Goldberg
patent: 4623851 (1976-11-01), Abou
IBM Technical Disclosure Bulletin, vol. 30, No. 8, Jan. 1988.
Grebene, Alan J., Integrated-Circuit Oscillators and Timers, John Wiley & Sons, 1984, pp. 580-587.

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