Power amplifier and method for reducing common mode noise thereof

Abstract

The invention relates to a power amplifier which comprises a sum and difference modulation module, a differential delay control module and an output stage module, wherein the sum and difference modulation module integrates and quantizes errors of a differential mode input signal and a differential mode output signal, and generates a first average signal and a second average signal; the differential delay control module comprises a first delay control module and a second delay control module which respectively receive the first average signal and the second average signal, and the first average signal and the second average signal are logically processed to generate a first signal and a second signal corresponding to the first average signal as well as a third signal and a fourth signal corresponding to the second average signal. The differential delay control module respectively decides the delay time between the first signal and the second signal as well as the delay time between thethird signal and the fourth signal according to the first control signal and the second control signal, the output stage module is controlled by the first signal, the second signal, the third signal and the fourth signal to generate the output signal so as to drive a load.

Description

technical field [0001] The present invention relates to a power amplifier, and in particular to a power amplifier that dynamically adjusts the dead time between signals controlling the operation of an internal switching circuit to reduce common noise of the power amplifier. Background technique [0002] Power amplifiers play a very important role in integrated circuit design, and are widely used in radio communications, television broadcast transmitters and receivers, high-fidelity stereo equipment, micro Computers and other electronic equipment. The function of the power amplifier is to increase the signal energy to drive the load or the next stage circuit. Therefore, the pros and cons of a power amplifier can be discussed from its power gain, where the power gain is the ratio of output power to input power. [0003] The larger the power gain, the better the amplification capability of the power amplifier. When the input signal is small, the power gain curve of a general...

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Problems solved by technology

However, this patent must first detect the amplitude of the input signal, then select the appropriate hysteresis interval through the look-up table, and convert it into a hysteresis control signal through the circuit

Therefore, the complexity and power consumption of the system circuit will be greatly increased, and it will also consume a large cost compared to the circuit implementation.

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