Oscillators – Solid state active element oscillator – Transistors
Patent
1988-11-07
1989-12-12
La Roche, Eugene R.
Oscillators
Solid state active element oscillator
Transistors
331108A, H03B 536
Patent
active
048870536
ABSTRACT:
Maximum frequency range in a VLSI voltage controllable crystal oscillator is obtained with a two-stage amplifier with feedback across both stages. The first stage is implemented by an MOS transistor connected in source-follower configuration to minimize input capacitance, and the second stage is implemented by a bipolar transistor to provide the needed gain. A bidirectional voltage limiter connected to a crystal node limits the oscillations to a symmetrical waveform. The bias of an output buffer amplifier may be selectively shifted to maintain optimum duty cycle with the different triggering levels of diverse logic driven by the oscillator, and the bias may be dynamically driven by an analog signal to provide a duty cycle-modulated output.
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.
La Roche Eugene R.
Pascal Robert J.
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