Patent ID: 7554474
Filing Date: 2009-06-30
Classification: H03M

Abstract:
1. An analog-to-digital converter (ADC) apparatus for converting an analog input into a digital output signal, said ADC apparatus comprising: feedforward means for processing a derived signal according to a predetermined filtering function to obtain a processed signal; compensating means for receiving said analog input signal and for generating a compensation signal to be combined with said processed signal to obtain a combined signal; single-bit or multi-bit quantizer means for converting said combined signal into said digital output signal; feedback means for generating an analog feedback signal by digital-to-analog converting said digital output signal, and for subtracting said analog feedback signal from said analog input signal to obtain said derived signal; and anti-aliasing filter means for suppressing alias signals, wherein alias suppression of said anti-aliasing filter means is set by a scaling coefficient less than one and greater than zero, wherein said compensating means comprise scaling means for scaling said analog input signal by applying said scaling coefficient to generate said compensation signal.