Reducing errors and power consumption in a multi-stage...

Details Reducing errors and power consumption in a multi-stage... Reducing errors and power consumption in a multi-stage...

2006-10-24

2006-10-24

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000

Reexamination Certificate

active

07126523

ABSTRACT:
An amplifier sharing technique in an analog to digital converter (ADC) in which a cascaded combination of a pre-amplifier and main amplifier is used to provide the required amplification for a first stage, and only the main amplifier is used to provide the amplification for the second stage. Switches and capacitors are used in conjunction such that the sampling and feedback capacitors of the first stage are connected across the cascaded combination in a first phase, and sampling and feedback capacitors of the second stage are connected across the main amplifier in a second phase. By appropriate choice of parameter values for various components, the second poles due to the pre-amplifier may be located at the higher frequency ranges obtaining the required unity gain bandwidth (UGB) without Miller compensation and/or additional gain.

REFERENCES:
patent: 5917440 (1999-06-01), Khoury
patent: 6400301 (2002-06-01), Kulhalli et al.
patent: 6509746 (2003-01-01), Wang
patent: 6686799 (2004-02-01), Ivry
patent: 6870495 (2005-03-01), Zadeh et al.
patent: 2002/0027453 (2002-03-01), Kulhalli et al.

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