Circuitry comprising a loop filter
AssigneeCirrus Logic International Semiconductor Ltd.
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.
Claims25
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 modulator configured to receive a digital signal based on the digital loop filter output signal and to output a modulated signal,
- wherein the driver circuitry further comprises a feedback path coupled to an output of the driver circuitry for the analog feedback signal.
-29. (canceled)
Driver circuitry comprising:
- a loop filter configured to receive an analog input signal and to output a digital loop filter output signal;
- and
- a modulator configured to receive a digital signal based on the digital loop filter output signal and to output a signal,
- wherein the loop filter comprises an analog integrator and a digital integrator.
Driver circuitry comprising:
- a loop filter configured to receive an analog input signal and to output a digital loop filter output signal;
- and
- a modulator configured to receive a digital signal based on the digital loop filter output signal and to output a modulated signal,
- wherein the loop filter comprises:
- an analog integrator;
- and
- an analog to digital converter (ADC),
- wherein a sampling rate of the ADC is greater than a output rate of the driver circuitry.
Dependencies are inferred from the claim text.