Digitally-switched impedance with multiple-stage segmented...

Details Digitally-switched impedance with multiple-stage segmented... Digitally-switched impedance with multiple-stage segmented...

2005-04-26

2005-04-26

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S154000

Reexamination Certificate

active

06885328

ABSTRACT:
A multiple-stage digitally-switched impedance has one “type B” stage and at least two “type A” stages. The type A stages are cascaded between high and low reference nodes and the type B stage. Each stage comprises a string of series-connected impedances and a switch network. A decoder responds to an digital input signal by controlling the switch networks to switch selectable portions of the strings in the type A stages into a series connection with the type B stage's string, and to control the type B stage's switch network to tap its string at a location to provide a impedance corresponding to the n-bit digital input signal between the final output node and at least one of the high and low reference nodes. Each stage provides a portion of the impedance's n-bit resolution, and the sum of the bits of resolution provided by each stage equals the total n-bit resolution.

REFERENCES:
patent: 5495245 (1996-02-01), Ashe
patent: 5568147 (1996-10-01), Matsuda et al.
patent: 6201491 (2001-03-01), Brunolli et al.
patent: 6384762 (2002-05-01), Brunolli et al.
patent: 6414616 (2002-07-01), Dempsey
patent: 6567026 (2003-05-01), Gorman

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