Abstract: A voltage regulator and a control method thereof are provided to dynamically adjust an output voltage. The voltage regulator comprises a plurality of switching transistors and a control circuit. The first end of each switching transistor receives a driving voltage, and the second end of each switching transistor is electrically connected to the end which outputs the output voltage. The input end and the feedback end of the control circuit respectively receive a reference voltage and the output voltage. A plurality of output ends of the control circuit are electrically connected to the control ends of the switching transistors respectively. Switching transistors adjust the output voltage. The control circuit compares the output voltage with the reference voltage, and selectively turns the switching transistors on or off according to the comparison between the output voltage and the reference voltage, to control the output voltage to approach the reference voltage.

Abstract: A power management system coupled to a speaker module includes a monitor module for measuring a current signal and a voltage signal of the speaker module to obtain a real-time impedance information of the speaker module; a reception module for receiving a time-domain audio analogy signal to be transformed into a frequency-domain audio digital signal; a prediction module for generating a power prediction information according to an initial audio information, the real-time impedance information and the audio digital signal; a control module for generating a control signal according to the audio digital signal and a human hearing model information; and a power adjustment module for outputting an adjustment audio signal to the speaker module according to the power prediction information, the audio digital signal and the control signal, so as to perform a broadcast operation of the speaker module.

Abstract: A differential interpolation pulse width modulation (iPWM) digital to analog converter is provided, including an iPWM module for generating differential pulses from an input digital audio data stream, a power driver for providing energy to a terminal load and a filter for removing unwanted harmonic signals to reconstruct an analog signal, wherein the iPWM module further includes a PWM pulse generator to convert the digital input numerical code to a series of time domain pulses; an interpolation unit to increase the time domain resolution of the pulses; a self-calibration unit to maintain the pulse-width accuracy of the interpolation unit; a differential pulse width generator to convert the series of time domain pulses into voltage and time domain differential form.

Abstract: A power management system coupled to a speaker module includes a monitor module for measuring a current signal and a voltage signal of the speaker module to obtain a real-time impedance information of the speaker module; a reception module for receiving a time-domain audio analogy signal to be transformed into a frequency-domain audio digital signal; a prediction module for generating a power prediction information according to an initial audio information, the real-time impedance information and the audio digital signal; a control module for generating a control signal according to the audio digital signal and a human hearing model information; and a power adjustment module for outputting an adjustment audio signal to the speaker module according to the power prediction information, the audio digital signal and the control signal, so as to perform a broadcast operation of the speaker module.

Abstract: A voltage regulator and a control method thereof are provided to dynamically adjust an output voltage. The voltage regulator comprises a plurality of switching transistors and a control circuit. The first end of each switching transistor receives a driving voltage, and the second end of each switching transistor is electrically connected to the end which outputs the output voltage. The input end and the feedback end of the control circuit respectively receive a reference voltage and the output voltage. A plurality of output ends of the control circuit are electrically connected to the control ends of the switching transistors respectively. Switching transistors adjust the output voltage. The control circuit compares the output voltage with the reference voltage, and selectively turns the switching transistors on or off according to the comparison between the output voltage and the reference voltage, to control the output voltage to approach the reference voltage.

Abstract: A differential interpolation pulse width modulation (iPWM) digital to analog converter is provided, including an iPWM for generating differential pulse from an input digital audio data stream, a power driver for providing energy to a terminal load and a filter for removing unwanted harmonic signal to reconstruct analog signal, wherein the iPWM further includes a PWM pulse generator to convert the digital input numerical code to a series of time domain pulse width; an interpolation unit to increase the time domain resolution of the pulse width; a self-calibration unit to maintain the pulse-width accuracy of the interpolation unit; a differential pulse width generator to convert series of PWM pulse into voltage and time domain differential form.