Method and apparatus for reducing noise in a...

Details Method and apparatus for reducing noise in a... Method and apparatus for reducing noise in a...

2007-10-02

2007-10-02

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S145000

Reexamination Certificate

active

11428108

ABSTRACT:
A method and apparatus for reducing noise in a digital-to-analog converter (DAC) having a chopper amplifier output stage provides improved DAC performance. A switched-current output provided from a digital filter is coupled to the input of a chopper amplifier. The current switches are non-uniform, so that extra zeros are provided at the chopping frequency of the chopping amplifier, thereby reducing noise that would otherwise be aliased in-band at the output of the chopper amplifier. The current switches may include a first set of half-magnitude switches followed by a set of full-magnitude switches and finally by another set of half-magnitude switches having a size equal to that of the first set.

REFERENCES:
patent: 6177896 (2001-01-01), Min
patent: 2006/0071834 (2006-04-01), del Mar Charmarro et al.
patent: 2006/0081605 (2006-04-01), Oita et al.

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