Binary weighted thermometer code for PVT controlled output drivers
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United States of America Patent
Stats
-
Jan 21, 2003
Grant Date -
N/A
app pub date -
Aug 2, 2001
filing date -
Aug 2, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A binary weighted thermometer code is employed to adjust the output impedance of a variable impedance output driver circuit. The driver circuit includes an impedance network comprising a plurality of resistive devices each programmably electrically connectable in parallel between a first voltage source and the signal pad. The resistive devices are partitioned into a plurality of sets. A first set of the resistive devices may be programmed in a binary incremental manner to electrically connect one or more of the resistive devices in the first set between the first voltage source and the signal pad. Only if all of the resistive devices in the first set are activated may a second set of the resistive devices be programmed in a binary incremental manner. Additional sets of the resistive devices may be likewise programmed only after all of the resistive devices in the previously programmed sets are activated.
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