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Patent

Variable on-and off-time relaxation oscillator

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TLDR
In this paper, a relaxation oscillator comprising three cascaded operational voltage comparators is described, and the on-time of the inventive circuit is established in accordance with a variable input element to the first operational comparator.
Abstract
A relaxation oscillator comprising three cascaded operational voltage comparators is described. The on-time of the inventive circuit is established in accordance with a variable input element to the first operational comparator. The off-time is established by an RC network in the input circuit of the second operational comparator. The first and second operational comparators are interconnected so that the turning on or off of the second operational comparator affects the first operational comparator to cause it to also turn on or off.

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References
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Patent

Digital-to-tone converter utilizing a relaxation oscillator

TL;DR: In this article, a diode switching network is constructed to receive a plural-bit digital input signal and to modify a circuit parameter in the oscillator feedback loop to adjust the frequency of oscillation in accordance with the coding of the input signal.