Synaptics Corporation

Davide Cartasegna

Lorenzo Crespi

Dan Shen

Kyehyung Lee

Ketan B Patel

Systems and methods according to one or more embodiments are provided for correcting a current measurement through a speaker in an audio system. In one example, a system for driving a speaker includes an output stage configured to drive a current through the speaker. The system further includes a first and second current sensor coupled to the output stage and configured to measure a positive current including a first measurement error and a negative current including a second measurement error through the speaker, respectively. The system further includes a processing block coupled to the first and second current sensors to receive the measured positive and negative current signals and configured to add a positive offset value to an input of each first and second current sensors, determine the first and second measurement errors, and correct a measured current using the positive and negative currents and the determined first and second measurement errors.

Correction of current measurement in an amplifier

Systems and methods according to one or more embodiments are provided for a current comparator with biasing circuitry to provide for low power consumption and high-speed performance. In one example, a system includes an input port to receive a current pulse and an amplifier configured to provide a voltage pulse at an output port in response to the current pulse. The system also includes a first biasing circuit coupled between the output port and the input port to selectively limit a voltage at the input port. The system further includes a second biasing circuit coupled to the amplifier to selectively adjust a bias of the amplifier.

High-speed current comparator suitable for nano-power circuit design

Systems and methods according to one or more embodiments are provided for sensing a current at an output of a switching amplifier. In one example, a system includes a first transistor switch coupled to a load configured to conduct a current in the load responsive to a first pulse width modulated control signal and a second transistor switch coupled to the load configured to conduct the current in the load responsive to a second pulse width modulated control signal. The system further includes a sample and hold circuit coupled between the load and a current sensing circuit configured to sample a voltage at the second transistor switch for a pre-determined sample time period in response to a midpoint of a second pulse width modulated control signal time period, and configured to provide the sampled voltage to the current sensing circuit.

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Oceanside, CA, United States of America

Davide Cartasegna