Patent ID: 8466823

Claim:
An analog-to-digital converting system for converting an analog input signal into a digital output signal, comprising: a track-and-hold circuit for tracking the input signal during a track mode and holding the tracked input signal during a hold mode; a reference voltage generator for generating a first reference voltage and a second reference voltage; a flash analog-to-digital converter for converting an output signal of the track-and-hold circuit into a first digital code and having a first digital-to-analog converter for converting the first digital code into a first analog signal, wherein the first digital code is related to a most-significant-bit set of the digital output signal of the analog-to-digital converting system; a subtractor for subtracting said first analog signal from said output signal of the track-and-hold circuit; a successive approximation analog-to-digital converter for converting an output signal of the subtractor into a second digital code according to the second reference voltage, wherein the second digital code is related to a least-significant-bit set of the digital output signal of the analog-to-digital converting system; and an error correction circuit for combining the most-significant-bit set and the least-significant-bit set by overlapping the most-significant-bit of the least-significant-bit set and the least-significant-bit of the most-significant-bit set of the digital output signal of the analog-to-digital converting system as to generate the digital output signal.