Exar Corporation

Zdravko Lukic

Aleksandar Prodic

Zhenyu Zhao

Aleksandar Radic

Jingquan Chen

Sheikh Mohammad Ahsanuzzaman

Eric Iozsef

A multichannel digital pulse width modulator/digital pulse frequency modulator uses a single ring oscillator that is shared by multiple channels. The ring oscillator has taps that can be used for least significant bit (LSB) precision of the generated PWM signal. The ring oscillator also produces a ring clock that is used to synchronize logic in the channels. Since the logic in the channels are synchronized by the ring clock, the channels can each independently produce different frequency PWM (or PFM) signals and still share the same ring oscillator.

Extendable N-channel digital pulse-width/pulse-frequency modulator

A switched mode power can use a digital controller to control the switching of the at least one switch of the switched mode power supply. The current through the power inductor can be estimated using a self-tuning digital current estimator.

Self-tuning digital current estimator for low-power switching converters

A practical method and system for oversampled digitally controlled DC-DC converters is presented. To minimize the switching losses while maintaining all advantages of the oversampling, 'glue logic' and application specific oversampling digital pulse-width modulator are introduced. Experimental results demonstrate transient response with 50% smaller deviation than that of conventional controllers, allowing for proportional reduction in the size of the power stage output capacitor.

Glue-logic based method and system for minimizing losses in oversampled digitally controlled DC-DC converters

A multiphase hybrid digital pulse width modulator can comprise a counter that is selectable between at least two different numbers of states to indicate a first portion of a switching period. Unclocked logic can indicate a second portion of the switching period. The unclocked logic can include a delay line.

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Toronto, Canada

Zdravko Lukic