St-ericsson Sa

Ericsson Modems Sa

Raja J Prabhu

Shyam Somayajula

Ankit Seedher

Shyam S Somayajula

A device implementing a scheme for reduction of pop-up noise is disclosed. The device comprises an audio sub-system () having an integrator () for amplifying an input signal () and a modulation circuit () including one or more comparators. The audio subsystem () is further provided with a feedback loop () across the integrator () and the modulation circuit () to calibrate an offsets outputs of the integrator () and the modulation circuit (). The feedback loop () includes an integrator-offset loop () across the integrator () to calibrate an offset () in the output of the integrator (), and an offset calibration loop () across the modulation circuit () to calibrate an offset () in the output of the modulation circuit ().

Pop-up noise reduction in a device

A device and a method for implementing pulse width modulation for switching amplifiers () is described herein. In one embodiment, the device includes a sampling signal generator () to generate a sampling signal () and a modulation unit () operatively coupled to the sampling signal generator (). The modulation unit () generates differential pulse width modulated waveforms based on the sampling signal () and differential input signals (-and-) such that at least one differential pulse width modulated waveform has a duty cycle equivalent to a pre-determined non-zero minimum pulse width at all values of the differential input signals (-and-).

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Bengaluru, India

Raja J Prabhu