High frequency CMOS oscillator

Details High frequency CMOS oscillator High frequency CMOS oscillator

1987-11-27

1989-08-01

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331108A, H03B 536

Patent

active

048536555

ABSTRACT:
Maximum frequency range in a CMOS voltage-controllable crystal oscillator is obtained with a two-stage amplifier with feedback across both stages. The first stage is connected in source-follower configuration to minimize input capacitance, and the second stage provides the needed gain. To eliminate body effect, the source electrode and body of the second stage CMOS device are connected together. A bidirectional voltage limiter connected to a crystal node limits the oscillations to a symmetrical waveform. Changes in effective duty cycle caused by the different triggering levels of diverse logic connected to the oscillator output are compensated for by selectively shifting dc bias to a buffer amplifier.

REFERENCES:
patent: 4388536 (1983-06-01), Peil et al.
patent: 4400812 (1983-08-01), Clark et al.
patent: 4405906 (1983-09-01), Luscher
patent: 4700125 (1987-10-01), Takata et al.

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