Oscillators – Solid state active element oscillator – Transistors
Patent
1985-06-06
1987-01-27
LaRoche, Eugene R.
Oscillators
Solid state active element oscillator
Transistors
331143, H03K 326
Patent
active
046396926
ABSTRACT:
A simple oscillator circuit is capable of generating a plurality of frequencies that are completely independent of one another, any one of which frequencies can be freely selected. The oscillator may be used as part of an electronic ringer for a telephone, for example. The oscillator circuit includes a capacitor which is charged from a current source. A discharge constant current circuit discharges the charge from the capacitor. A comparator compares the charge voltage on the capacitor with a first or a second reference voltage. In response to the output of the comparator, a reference voltage switching control circuit supplies the first or second reference voltage to the comparator and controls the turning on and off of the discharge constant current circuit. A control constant current source controls the current from the charge current source for charging the capacitor. The frequency of the output signal from the comparator is controlled by regulating the control constant current source to switch the current capacity of the charge current source.
REFERENCES:
patent: 4359649 (1982-11-01), Mundel
patent: 4377790 (1983-03-01), Zobel et al.
patent: 4465983 (1984-08-01), Hogeboom
IEEE Journal of Solid-State Circuits, vol. SC-13, No. 6, 12/78, "A Low-Voltage IC Timer", by: Hans R. Camenzind, et al.
LaRoche Eugene R.
NEC Corporation
Pascal Robert J.
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