August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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JFET current regulator diodes
Using JFETs and CRDs to Create Current Sources
171
forward current (I
Fwd
). Some low-current CRDs have a very low limiting voltage of less
than 1 volt, such as those devices shown in Figure 6.22.
Some data sheets refer to a reverse voltage (V
R
), which is simply the value of a
reverse-bias
voltage that the device can withstand (with the cathode positive and the
anode negative). It is usually measured at a low reverse current (I
R
) of 1 mA and is
approximately a diode drop of 0.7 to 0.8 volt. This is shown in Figure 6.25 and can
be considered equivalent to the JFET’s gate-drain channel diode. Exceeding the
specified absolute ...
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