The present invention relates to a low cost analog to digital converter (ADC) and a method for converting an analog signal to a digital signal. The method includes the steps of: outputting a pulse modulation signal according to a digital value; performing a low-pass filtering to the pulse modulation...http://www.google.de/patents/US7872600?utm_source=gb-gplus-sharePatent US7872600 - Low cost analog to digital converter and a method for converting an analog signal to a digital signal
