August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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Wyatt current source
Using BJTs to Create Current Sources
87
where again r
ce
is determined by:
Here the output resistance is “beta times” the collector-emitter resitance of the transis-
tor Q
4
(in both circuits), which can provide a value from hundreds of KΩ to tens of MΩ,
depending on the voltage, current output, beta, and r
ce
values. It’s worth noting that
the Texas Instruments/Burr-Brown REF-200 contains a Full Wilson current mirror and
two current sources in a choice of either an eight-pin DIP or an eight-pin SOIC sur-
face-mount package. That current mirror is specified as having a minimum output
impedance of 20 MΩ, and the emitter degeneration resistors ...
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