Oscillator having reduced sensitivity to supply voltage changes
OwnerWilliam Brandes Shearon, Salomon Vulihinventors
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Abstract
An oscillator includes a first sawtooth waveform generator for generating a first sawtooth waveform having a selectively started ramp portion and a second sawtooth waveform generator for generating a second sawtooth waveform having a selectively started ramp portion. A controller is also included for alternatingly controlling the first and second sawtooth waveform generators so that a transition to the ramp portion of one sawtooth waveform is based upon determining the ramp portion of the other sawtooth waveform reaching a trip point. The controller also sets the trip point substantially independent of a supply voltage so that the oscillator has reduced sensitivity to supply voltage changes.
Claims24
An oscillator comprising:
- a first sawtooth waveform generator for generating a first sawtooth waveform having a selectively started ramp portion;
- a second sawtooth waveform generator for generating a second sawtooth waveform having a selectively started ramp portion;
- and
- a controller for alternatingly controlling the first and second sawtooth waveform generators so that a transition to the ramp portion of one sawtooth waveform is based upon determining the ramp portion of the other sawtooth waveform reaching a trip point, said controller also varying a slope of the first and second sawtooth waveforms based upon a supply voltage so that a duration of the first and second sawtooth waveforms remains substantially constant over a supply voltage range.
An oscillator comprising:
- a first sawtooth waveform generator for generating a first sawtooth waveform having a ramp portion;
- a second sawtooth waveform generator for generating a second sawtooth waveform having a ramp portion;
- and
- a controller for alternatingly controlling the first and second sawtooth waveform generators so that a transition to the ramp portion of one sawtooth waveform is based upon determining the ramp portion of the other sawtooth waveform reaching a trip point, said controller also varying a slope of the first and second sawtooth waveforms based upon a supply voltage so that a duration of the first and second sawtooth waveforms remains substantially constant over a supply voltage range.
A method for generating an oscillating signal comprising:
- generating a first sawtooth waveform having a ramp portion;
- generating a second sawtooth waveform having a ramp portion;
- transitioning to the ramp portion of one sawtooth waveform based upon determining the ramp portion of the other sawtooth waveform reaching a trip point to thereby generate the oscillating signal;
- and
- varying a slope of the first and second sawtooth waveforms based upon a supply voltage so that a duration of the first and second sawtooth waveforms remains substantially constant over a supply voltage range.
Dependencies are inferred from the claim text.