Analog-to-digital converter with digital compensation

Details Analog-to-digital converter with digital compensation Analog-to-digital converter with digital compensation

1996-12-23

1999-02-09

Williams, Howard L.

Coded data generation or conversion

Converter compensation

341162, H03M 106

Patent

active

058700412

ABSTRACT:
A digitally compensated analog-to-digital converter (ADC) provides improved linearity by generating calibration values having higher resolution than the output signal generated during a normal conversion. During a calibration value generation operation, the converter performs a normal conversion, then performs an additional conversion, thereby generating a high resolution calibration value which is then rounded and stored in a memory device. The converter includes a flash ADC which converts an analog input signal received through a multiplexer and sample-hold amplifier to a digital signal. The flash ADC provides control signals to a multibit digital-to-analog converter which generates the analog reconfiguration signal during multi-stage conversions. A digital correction circuit receives the digital signals from several multi-stage conversion and generates a corrected signal. A digital calibration circuit stores the rounded calibration values during a calibration value generation operation and generates a digital calibration signal which is added to the corrected signal during a normal operation to generate a digitally compensated signal.

REFERENCES:
patent: 5017920 (1991-05-01), French
patent: 5635937 (1997-06-01), Lim et al.

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