August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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Other topologies emerge
A Short History of References
9
tions that provided a tempco of 0.6-ppm/˚C; and National Semiconductor again with its
low-cost bandgap devices LM185 family (previously designed by Bob Dobkin).
While current source references used either the LM134, dual/quad matched BJTs, or
JFET CRDs, in 1990 Burr-Brown introduced its remarkable REF200. This unique
device contained two fixed 100-µA current sources, as well as a precision current mir-
ror, all packaged in an eight-pin
surface-mount
SOIC package. It used a proprietary
Burr-Brown dielectrically isolated (Difet
®
) process,
which completely isolated the three
circuits, making ...
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