Correction system and method of successive approximation a/d converter

Abstract

The present invention provides a correction system and method for a Successive Approximation A/D Converter (SA-ADC) of the prior art. The operation method of the correction system is described in the following: (1) Using the SA-ADC of the prior art to convert an analog signal to a digital data. The digital data is a series of logic numbers. (2) Detecting the last number of the digital data is logic number [0] or logic number [1]. (3-1) When the last number is logic number [1], proceeding the digital data and logic number [1] with an addition operation to generate a first detection digital data. Converting the first detection digital data to a first detection signal for comparing with the analog signal. If the analog signal is higher than the first detection signal, then replacing the digital data by the first detection digital data. If the analog signal is lower than the first detection signal, then outputting the digital data without correcting. (3-2) When the last number is logic number [0], using the digital data to detect directly. Converting the digital data to a second detection signal for comparing with the analog signal. If the analog signal is higher than the second detection signal, then outputting the digital data without correcting. If the analog signal is lower than the first detection signal, then proceeding the digital data and logic number [1] with a subtraction operation to generate a second detection digital data to replace the digital data.