Patent ID: 6229469
Filing Date: 2001-05-08
Classification: H03M

Abstract:
A method of adaptively converting an analog signal to a digital signal, comprising the steps of:a) generating an analog differential signal based upon a difference between an estimated last sampled signal and a current signal;b) amplifying said analog differential signal based upon a first gain optimized so as to increase the use of a predetermined input range of an analog-to-digital (A/D) converter;c) converting said amplified analog differential signal to a digital signal in a first number of bits using the A/D converter; andd) integrating the digital signal to generate an integrated digital signal represented by a second number of bits different from the first number of bits;e) converting said integrated digital signal into a second analog signal according to the second number of bits using a digital-to-analog (D/A) converter andf) amplifying the second analog signal based upon a second gain to update the estimated last sampled signal, wherein the second gain is a function of the first gain and the first and second numbers of bits.