SYSTEM AND METHOD FOR A HIGH RESOLUTION DIGITAL INPUT CLASS D AMPLIFIER WITH FEEDBACK

摘要

A system and method is disclosed for a digital input Class D amplifier which includes an interpolation filter to up-sample a digital signal, a noise shaping modulator to suppress in-band quantization errors due to digital pulse width modulation and truncation errors, and a hybrid finite impulse response filter/digital to analog converter coupled to an analog input Class D amplifier with digital pulse width modulation control loop. The hybrid finite impulse response filter/digital to analog converter uses N-taps implemented digitally and N-tap weights implemented in analog using resistors.