Oscillators – Solid state active element oscillator – Transistors
Patent
1980-10-16
1982-12-21
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331116R, H03K 3282, H03B 536
Patent
active
043652131
ABSTRACT:
A low frequency oscillator of the astable type having good frequency stability, fast starting, good immunity to DC loading, and suitable for fabrication in integrated circuit form. First and second switching transistors of the astable multivibrator are cross-coupled by a coupling capacitor and a frequency determining crystal. Base drive to the respective switching transistors and charging current to the capacitor and crystal are provided by a pair of differential amplifiers which are referenced to a forward biased diode. The differential amplifiers are also connected to respective collector terminals of the switching transistors. The capacitor is of small value suitable for containment within an integrated circuit with the oscillator circuit. The differential amplifiers substantially increase the impedance levels in the oscillator and shift base drive to the switching transistors to minimize the effects of DC loading at the output terminals of the oscillator.
REFERENCES:
patent: 3152306 (1964-10-01), Cooper et al.
patent: 3217269 (1965-11-01), Rowley et al.
patent: 3295069 (1966-12-01), Perry
patent: 3380002 (1968-04-01), Hogue
patent: 3434051 (1969-03-01), Newhoff
patent: 3566301 (1971-02-01), Grangaard, Jr.
patent: 3581235 (1971-05-01), Siu
patent: 3613029 (1971-10-01), Bartlett
patent: 3623147 (1971-11-01), Scheerer
patent: 3688213 (1972-08-01), Calaway
patent: 4216442 (1980-08-01), Wheatley, Jr.
patent: 4286234 (1981-08-01), Denny
"Bipolar Micropower Circuits for Crystal-Controlled Timepieces", The Journal of Solid-State Circuits, vol. SC-7, No. 2, Apr., 1972.
Chapman Ronald H.
Hansen Kenneth A.
Gillman James W.
Grimm Siegfried H.
Motorola Inc.
Pristelski James S.
Roney Edward M.
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