Circuitry comprising a loop filter
AssigneeCirrus Logic, Inc.
InventorsJohn L. Melanson, Eric J. King, Thomas H. Hoff, Lingli Zhang
Life of this patent
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Abstract
Pulse width modulation (PWM) driver circuitry comprising: a loop filter configured to receive an analog input signal and to output a digital loop filter output signal based on the analog input signal and an analog feedback signal; and a PWM modulator configured to receive a digital signal based on the digital loop filter output signal and to output a PWM signal, wherein the PWM driver circuitry further comprises a feedback path coupled to an output of the PWM driver circuitry for the analog feedback signal.
Claims30
Pulse width modulation (PWM) driver circuitry comprising:
- a loop filter configured to receive an analog input signal and to output a digital loop filter output signal based on the analog input signal and an analog feedback signal;
- and
- a PWM modulator configured to receive a digital signal based on the digital loop filter output signal and to output a PWM signal,
- wherein the PWM driver circuitry further comprises a feedback path coupled to an output of the PWM driver circuitry for the analog feedback signal.
A hybrid loop filter comprising:
- an input for receiving an analog input signal;
- an analog integrator for receiving the analog input signal and generating an integrated analog signal;
- and
- an analog to digital converter for converting the integrated analog signal into a digital loop filter output signal.
Dependencies are inferred from the claim text.