August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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398
Temperature-compensated zeners
The amount of current regulation needed will then be:
This level of regulation is easily met by most precision current sources shown in this
book. For the 1N821 series, the current level required is nominally 7.5 mA, which can
be provided by discrete DMOS FETs or BJTs, and using low tempco precision resis-
tors. For the 1N4565 series, the current level required is either 0.5 mA or 1.0 mA,
which can easily be provided by discrete JFETs, BJTs, or the LM134/334, also using
low tempco precision resistors. (The JFET cascode version is also accurate and
applies to this current level.)
Table 13.5 provides a listing of the most ...
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