Abstract: An audio signal can be amplified by providing an audio signal to an input of an amplifier, and amplifying the audio signal based on pulse width modulation to provide the amplified audio signal at an output node. A feedback can be provided from the output node to the input node, and include passing a feedback signal through a high bandwidth input common mode loop and through a low bandwidth output common mode loop, and introducing a desired phase change with the low bandwidth output common mode loop for the high bandwidth input common mode loop.

Abstract: A system for equalizing errors in common mode inputs due to mismatches, the system including a driver configured to provide a first voltage to a first bus and a second voltage to a second bus; a loop filter coupled to the first bus and to the second bus and configured to provide a feedback signal; a first current source configured to source or sink a constant current from the first bus and second bus; a second current source configured to source or sink a variable current from the first bus and second bus; and a controller configured to receive the feedback signal, based on the feedback signal, determine a first value for the variable current, and responsive to determining the first value, control the second current source to source or sink the variable current having the first value.

Abstract: In some embodiments, an audio amplifier can include an input for receiving a signal to be amplified, and an amplification stage configured to amplify the signal based on pulse width modulation and provide the amplified signal at an output node. The audio amplifier can further include a feedback circuit implemented between the output node and the input node. The feedback circuit can include a series arrangement of a high bandwidth input common mode loop and a low bandwidth output common mode loop, with the low bandwidth output common mode loop configured to provide a desired phase change for the high bandwidth input common mode loop.

Abstract: A class-D amplifier having an output driver with a first, second, and third driver, the output driver having a first output coupled to the first and third drivers, a second output coupled to the second driver; a sensing resistor coupled in series between the first driver and the first output; and a pulse width modulation (PWM) controller coupled to the inputs of the drivers and configured to receive an audio input signal; control a PWM generator to generate a first pulse signal and a second pulse signal based on the audio input signal and a power supply input; determine a voltage drop across the sensing resistor; and, responsive to the voltage drop being greater than a threshold, sequence control of the first pulse signal to the first driver and switch a voltage at the first driver to an increased voltage based on the voltage drop.

Abstract: This disclosure relates generally to a system for mitigating error in an amplifier. The system may include a loop filter; a driver; a digital-to-analog converter (DAC) configured to source and to sink current; an edge selector configured to determine a first delay between the driver receiving a signal to provide a driver output signal and the driver providing the driver output signal; a timing circuit configured to determine a second delay between the DAC receiving a signal to provide a DAC output current and the DAC providing the DAC output current; and at least one controller configured to control the DAC to source or to sink the DAC output current at a time corresponding to a beginning of the driver output signal, and control the DAC to stop sourcing or sinking the DAC output current at a time corresponding to an end of the driver output signal.

Abstract: A class-D amplifier having an output driver with a first, second, and third driver, the output driver having a first output coupled to the first and third drivers, a second output coupled to the second driver; a sensing resistor coupled in series between the first driver and the first output; and a pulse width modulation (PWM) controller coupled to the inputs of the drivers and configured to receive an audio input signal; control a PWM generator to generate a first pulse signal and a second pulse signal based on the audio input signal and a power supply input; determine a voltage drop across the sensing resistor; and, responsive to the voltage drop being greater than a threshold, sequence control of the first pulse signal to the first driver and switch a voltage at the first driver to an increased voltage based on the voltage drop.

Abstract: In some embodiments, an audio amplifier can include an input for receiving a signal to be amplified, and an amplification stage configured to amplify the signal based on pulse width modulation and provide the amplified signal at an output node. The audio amplifier can further include a feedback circuit implemented between the output node and the input node. The feedback circuit can include a series arrangement of a high bandwidth input common mode loop and a low bandwidth output common mode loop, with the low bandwidth output common mode loop configured to provide a desired phase change for the high bandwidth input common mode loop.