Oscillators – Solid state active element oscillator – Transistors
Patent
1987-12-22
1988-07-12
LaRoche, Eugene R.
Oscillators
Solid state active element oscillator
Transistors
328188, H03K 326
Patent
active
047572809
ABSTRACT:
An oscillator is disclosed which comprises a current source for supplying currents at respective outputs; a capacitor coupled between first and second ones of the outputs of the current source which is charged and discharged between upper and lower voltage thresholds; a comparator for supplying a switching control signal at an output responsive to the capacitor being charged and discharged to the upper and lower voltage thresholds, the comparator having a first input to which is supplied a reference voltage and a second input coupled to the first output of the current source and including a first switchable gain current mirror the gain of which is at a first value whenever the capacitor is being charged and is at a second lower value whenever the capacitor is being discharged, the first current mirror having a control terminal; a second switchable gain current mirror which is coupled between the first and second outputs of the current source and having a control terminal the gain of which is at a first value whenever the capacitor is being charged and is at a second higher value whenever the capacitor is being discharged; and an NPN switching transistor which is operated between conducting and non-conducting states in response to the switching control signal for switching the gain values of the first and second current mirrors accordingly, the transistor having a base coupled to the output of the comparator and its collector-emitter conduction path coupled to the control terminals of the first and second switchable gain current mirrors.
REFERENCES:
patent: 4415869 (1983-11-01), Duijkers
patent: 4670721 (1987-06-01), Gontowsk, Jr. et al.
Smith, Versatile Triangle Wave Generator, Wireless World, Feb. 1973, vol. 79, No. 1448, pp. 87-89.
Bingham Michael D.
LaRoche Eugene R.
Motorola Inc.
Pascal Robert J.
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