August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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74
Widlar current sources
theless, if you want a simple, three-component current source, this may be all you
need for your application. Also, this current source is often used in conjunction with
additional mirrors, which can either multiply or divide its output current (I
C2
), or even
invert it. We will look at this subject more, later in the chapter.
4.3 Widlar current sources
It is likely that the legendary Bob Widlar (who at 25 years old designed the first mono-
lithic op amp—the µA702 at Fairchild Semiconductor in the mid-60s) ran into the same
problem when creating the internal biasing for his op amps: he needed to design a
better current source. ...
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