DIGITALLY CALIBRATED SAWTOOTH GENERATOR FOR PWM BASED BUCK CONVERTERS

Embodiments herein relate to a circuit which generates a sawtooth waveform based on an adaptive feedback loop that self-corrects the ramp up rate to account for variations in a device. The sawtooth waveform is obtained by repeatedly charging and discharging a capacitor according to a clock signal. T...

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Bibliographic Details
Main Authors Schaef, Christopher, Munoz Constantine, Juan, Lyakhov, Alexander, Janardanan, Ajay
Format Patent
LanguageEnglish
Published 24.02.2022
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
PULSE TECHNIQUE
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Summary:Embodiments herein relate to a circuit which generates a sawtooth waveform based on an adaptive feedback loop that self-corrects the ramp up rate to account for variations in a device. The sawtooth waveform is obtained by repeatedly charging and discharging a capacitor according to a clock signal. The sawtooth waveform can be sampled once per clock period at a comparator which provides a corresponding binary output to a state machine. If the binary output indicates the amplitude of the sawtooth waveform is below a desired maximum voltage, the state machine outputs a code word to a digitally-controlled variable current source to increase the output current. The sawtooth waveform can be used to provide a pulse-width modulated (PWM) waveform such as for a DC-DC converter.
Bibliography:Application Number: US202117517573