August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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Creating current sources with op amps
Creating Precision Current Sources with Op Amps and Voltage References
301
This is shown by equation 11.3. In fact, this would only happen if the reference voltage
was extremely large—on the order of several hundred volts.
So, adding an op amp to the circuit isolates the voltage reference from the load and
avoids this problem completely.
Creating current sources with op amps and voltage references also depends on using
a precision resistor to convert the reference voltage into a precise and stable refer-
ence current. In such a design, the op amp circuit effectively functions as a precision
voltage-to-current conv ...
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