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Abstract

An autoranging analog to digital conversion system is provided. The system may include a digitally programmable preamplifier for amplifying a difference between an analog input and an estimate of the analog input. The preamplifier may be coupled to an analog to digital converter for converting the preamplifier output to a digital signal. The system may also include digital domain predictor or estimation logic for determining an optimum gain and analog input estimate for a given analog input. Multiple signal input channels may be coupled to the analog to digital conversion system. The autoranging estimations may be performed on a sample by sample basis or a channel by channel basis. The conversion system may also include the use of a backup conversion path for use when the main conversion path overranges. The backup conversion path may utilize a dedicated backup converter. The backup conversion path may alternatively utilize the estimation converter to generate backup conversions or may utilize the main converter to generate backup conversions.

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