Patent ID: 6791484
Filing Date: 2004-09-14
Classification: H03M

Abstract:
An analog-to-digital converter system that is configured to provide a digital output signal in response to an analog input signal, the system comprising:an overranging analog-to-digital converter that is arranged to convert an intermediary analog signal into an intermediary digital signal, wherein: the intermediary analog signal is related to the analog input signal, an output range associated with the overranging analog-to-digital converter extends beyond a full dynamic range of the analog-to-digital converter system, the intermediary digital signal has a first number of bits of resolution; and a digital fine offset adjustment circuit that is configured to determine a fine offset during a calibration phase, and further configured to process the intermediary digital signal during a conversion phase such that: the determined fine offset is digitally subtracted from the intermediary digital signal to provide an offset adjusted digital signal, and the offset adjusted digital signal is decoded to provide the digital output signal such that the digital output signal has a second number of bits of resolution, wherein the first number of bits of resolution is greater than the second number of bits of resolution.