August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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The JFET cascode current source
Using JFETs and CRDs to Create Current Sources
163
12. Draw a resistor load-line on the graph that intersects at the V
GS
value
arrived at in steps 6 and 7, and at your desired current level. Ideally
the load-line should be close to or intersect with the zero TC point. If
not, try another device where this happens, or consult Table 6.1 for
an approximate value of V
GS
(0TC)
and I
DZ
. If the intersect point is
not
close to the zero TC point, the current source will drift with
temperature.
13. Determine the value of the JFET’s source resistor (R
S
). Make sure
that you use a metal-film type, or a precision wirewound resistor ...
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