August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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278
TI/Burr-Brown’s REF-200 monolithic current source
ing a pair of JFETs helps boost the output impedance and improves overall regulation.
Two hundred microamps are supplied from the REF-200’s two current sources, which
each have a zero TC. The LM234 supplies 14.4 µA, also with a zero TC. This current is
fed to the input of the REF-200’s current mirror, which outputs the same value. JFET
Q
2
’s source feeds the output of the current mirror, the input of the LM234, and both of
the REF-200’s current mirrors. The total current flowing out of the circuit is 228.8 µA,
with a zero TC, and with a very high output impedance of more than 1 GΩ.
The circuit could ...
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