METHOD AND SYSTEM FOR AN ALL-DIGITAL CLASS-D MODULATOR AND ITS SATURATION PROTECTION TECHNIQUES

摘要

A method and system for modulating the electrical input signal is disclosed in this application. In terms of method, the method comprising the steps of: modulating the input analog signal using a digital class -D modulator, may comprise the step of generating a digital output signal that is proportional to such an analog input signal. Class -D digital modulator may be configured as four stages. In order to avoid the saturation of the integrator (integrator), the output of the at least one integrator stage can be limited by using a limiter (limiter) in the integrator feedback loop. Class -D digital modulator uses a pulse width modulation technique. To improve the signal-to-noise ratio at the desired output power, the voltage magnitude of the triangle wave oscillator may be larger than the size of the integrated analog input signal. The digital output signal can be fed back at least in any one of the four stages in the digital input class -D modulator. The frequency of the triangular wave oscillator can be adjusted to fit the desired output frequency. The digital gain stage in the class -D modulator can be programmed allowing you to adjust the signal transfer function (signal transfer function, STF) and Noise Transfer Function (noise transfer functinon, NTF).