Oscillators – Solid state active element oscillator – Transistors
Patent
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.
Embree David M.
Logan Shawn M.
American Telephone and Telegraph Company AT&T Bell Laboratories
Cameron Joseph A.
LaRoche Eugene R.
Pascal Robert J.
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