August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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316
Creating precision current regulators with op amps
gate of the JFET by feedback, so a state of equilibrium is reached between its input
terminals. This results in the V
REF
voltage setting being impressed across the current-
setting resistor, R
S
. As a result, this reference voltage is converted to a constant cur-
rent, regardless of load voltage. The op amp should be a good precision type, with an
input common-mode range that includes ground. The output current is set by the volt-
age across the current-setting resistor, R
S
, divided by its ohmic value. Even though no
particular precision op amp or voltage reference IC has been specified in this design, ...
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