August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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137
Chapter 6
Using JFETs and CRDs to Create Current Sources
6.1 The JFET paved the way
Just as BJTs can be used to create current sources, so too can field-effect transistors.
The designer can readily utilize
junction
FETs (JFETs) and complementary metal
oxide semiconductor (CMOS) FETs in low current-source applications. Alternately,
one can use double-diffused MOS (DMOS) FETs for higher current requirements.
However, these types of devices are often overlooked by the OEM board-level
designer, because of their somewhat unfamiliar terminology, as opposed to the wide-
scale popularity of the bipolar junction transistor (BJT). Actually, use of the ...
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