Abstract: A system and method is provided for providing integrated over-current protection in a switching power supply. In one embodiment, a switching power supply could comprise a gate drive circuit operative to receive a pulse-width modulated (PWM) signal and to drive at least one power field effect transistor (FET) between alternating activated and deactivated states based on a pulse-width of the PWM signal. The switching power supply could also comprise a current sense circuit operative to measure a current associated with the at least one power FET during the activated state. The switching power supply could also comprise a first over-current protection circuit providing a first adjustment to the PWM signal in response to the current being substantially between a first threshold and a second threshold. The second threshold could be greater than the first threshold.

Abstract: A switching amplifier system to reduce noise outside of the information signal, but still within the Audio Signal Bandwidth. The present invention is advantageous for reducing noise in low cost systems which contain sensitive RF front ends that include a switching amplifier and or a Switched Mode Power Supply (SMPS). These power-switching systems can produce high frequency interfering signals, which reduce the audio performance of sensitive RF front-ends including AM/FM/TV band tuner areas. In contrast to metal shielding and EMI filters use in prior art solutions, the present invention can be implemented at low cost in existing digital silicon processes. In the present invention, a filter is provided that minimizes the in-band audio noise by carefully filtering the audio signal based a predicted interference pattern. The predicted interference pattern is determined by examining the key contributors to the EMI spectrum generation, and their mapping into the tuner frequency selected.

Abstract: A method for generating digital filters for equalizing a loudspeaker. First digital data is provided, for a tolerance range for a target response curve of sound level versus frequency for the loudspeaker. Second digital data is generated, for an actual response curve of sound level versus frequency for the loudspeaker. The first digital data is compared with the second digital data and it is determined whether the actual response curve is within the tolerance range. If the actual response curve is not within the tolerance range, digital audio filters are iteratively generated, and the digital audio filters are applied to the second digital data to generate third digital data for a compensated response curve. The frequency, amplitude and bandwidth of the digital audio filters are automatically optimized until the compensated response curve is within the tolerance range or a predetermined limit on the number of digital audio filters has been reached, whichever occurs first.