Providing reference voltage with desired accuracy in a short...

Details Providing reference voltage with desired accuracy in a short... Providing reference voltage with desired accuracy in a short...

2006-08-22

2006-08-22

Barne, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S150000

Reexamination Certificate

active

07095356

ABSTRACT:
Simplifying the design of buffer amplifier circuits to provide reference voltages of desired characteristics on a path. Two separate circuits may be used to provide the necessary charging (of a load connected to the path) in non-overlapping time durations. In an embodiment in which the load comprises sampling capacitors of a stage of an analog to digital converter (ADC), each of the two circuits contains a corresponding charging capacitor, with the charging capacitors charging the load in non-overlapping time durations of a hold phase. The first charging capacitor may be charged using a coarse buffer with a high drive strength and the second charging capacitor may be charged using a fine buffer with high accuracy.

REFERENCES:
patent: 6628217 (2003-09-01), Dunne
patent: 6888358 (2005-05-01), Lechner et al.
patent: 6894632 (2005-05-01), Robinson

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