Methods and systems for calibrating a pipelined...

Details Methods and systems for calibrating a pipelined... Methods and systems for calibrating a pipelined...

2011-03-01

2011-03-01

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000

Reexamination Certificate

active

07898452

ABSTRACT:
This method increases accuracy of a pipelined analog-to-digital converter comprising a plurality of stages, each stage comprising an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC). The method includes calibrating each the ADC starting from a least significant stage until all ADCs have been calibrated using a reference digital-to-analog converter, the reference digital-to-analog converter selectively outputting values at desired trip points for each the ADC; measuring an output of each the DAC using downstream stages of the pipelined analog-to-digital converter to produce output measurements; and using the output measurements to calculate an error-corrected output of the pipelined analog-to-digital converter. The trip points are adjusted by modifying a reference current input to a comparator of each the ADC.

REFERENCES:
patent: 5977894 (1999-11-01), McCarroll et al.
patent: 6825783 (2004-11-01), You
patent: 7688238 (2010-03-01), Lewis et al.
patent: 2002/0067297 (2002-06-01), Donovan et al.
patent: 10-2005-0086242 (2005-08-01), None

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