Analog to digital converter system including computer controlled feedback means

Claim 1

In an analog to digital conversion system of the type including means for summing an analog input signal with a feedback signal from a digital to analog converter to provide an error signal, means for adjusting the gain of the error signal, an analog to digital converter for converting the analog signal to a digital signal, computer means including an integrator for integrating the digital signal and for providing a digital output corresponding to the analog input signal and divider means for dividing the integrated digital signal by a predetermined scale factor signal, the digital to analog converter connected to the divider means for converting the signal therefrom to an analog signal which scales the integrator to said converter, the improvement comprising: the signal from the divider means including a quotient signal and a remainder signal; the digital to analog converter converting the quotient signal to an analog signal which scales the integrator to said converter; the computer means including means for combining the remainder signal with a signal which is a function of the gain adjustment of the error signal and the least significant bit in the converters to provide a first combined signal, means for combining the first combined signal with the digital signal from the analog to digital converter to provide a second combined signal, and the integrator integrating the second combined signal.