Current souces ar e used in a
variety of applications. They
can be designed in a number of
ways. One of the simplest is a
common resistor, but this presupposes
a constant load and a constant
voltage supply. If those requirements
are not met, the current
will vary according to the circuit
elements. A considerable improvement
is achieved when an
active element like a transistor is
added to the resistor. Variations
in the ambient temperature and
in the threshold potential of the
p-n junction then determine the
accuracy of the source.
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