Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2005-12-13
2005-12-13
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S154000
Reexamination Certificate
active
06975261
ABSTRACT:
A D/A converter including first and second R-R2 resistor ladders and a set of SPDT switches. The first R-2R resistor ladder includes N type resistors coupled between a common voltage node and an output voltage node and the second R-2R resistor ladder includes P type resistors coupled between the common and output voltage nodes. The R-2R resistor ladders have multiple common switch terminals, each coupling an N type 2R resistor to a corresponding P type 2R resistor. Each SPDT switch is responsive to a data bit for switching a common switch terminal between the common voltage and a reference voltage. Each N type resistor may be formed in a PWell coupled to the common (or more negative) voltage and each P type resistor may be formed in an NWell coupled to the reference (or more positive) voltage. The SPDT switches may be configured with equivalent switch path impedances.
REFERENCES:
patent: 5589702 (1996-12-01), Alter
patent: 5614864 (1997-03-01), Stubbe et al.
patent: 6018272 (2000-01-01), Marsh et al.
Intersil America's Inc.
Jean-Pierre Peguy
Stanford Gary R.
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