Circuit for zero offset auto-calibration and method thereof

Details Circuit for zero offset auto-calibration and method thereof Circuit for zero offset auto-calibration and method thereof

2006-08-01

2006-08-01

Nguyen, Linh (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S120000, C341S161000

Reexamination Certificate

active

07084792

ABSTRACT:
A circuit for zero offset auto-calibration and a method thereof suitable for video signal analog-to-digital converters are provided. The circuit is connected between the last stage of a pipeline analog-to-digital converter (the pipeline ADC) and a differential signal buffer, comprised of an indicator signal generator, a calibration voltage generator and a timing controller. The indicator signal generator outputs an indicator signal to indicate whether the output from the pipeline ADC is too high or too low. The calibration voltage generator provides the differential signal buffer with a calibration voltage and, within a calibration period determined by a delay signal, regulates the calibration voltage in response to the indicator signal. The timing controller outputs the delay signal to control the length of the calibration period, so that the compensation speed of the pipeline ADC is less than its converting delay speed, and the compensation loop gets stable.

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