Reference voltage pre-charge in a multi-step sub-ranging...

Details Reference voltage pre-charge in a multi-step sub-ranging... Reference voltage pre-charge in a multi-step sub-ranging...

2007-05-08

2007-05-08

Nguyen, Khai M. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S122000, C341S155000

Reexamination Certificate

active

11213393

ABSTRACT:
Multi-step sub-ranging analog-to-digital converters (ADCs) utilize a plurality of converter modules to generate sub-ranges of bits for a digital output signal during a multi-phase conversion cycle. Each subsequent converter utilizes reference voltage levels corresponding to conversions performed by prior converters during the timing phases of the conversion cycle. Settling time for these reference voltages, which limits the speed and/or accuracy of each conversion, may be reduced by pre-charging the reference input nodes of the subsequent converters using the analog input signal during a timing phase in which a prior converter is converting the analog input signal to generate one of the sub-ranges for the digital output signal.

REFERENCES:
patent: 6014097 (2000-01-01), Brandt
patent: 6177899 (2001-01-01), Hsu
patent: 6232907 (2001-05-01), Nagaraj et al.
patent: 6606049 (2003-08-01), Marble

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