August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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Depletion-mode DMOS current sources
Creating Medium-Power Current Sources with DMOS FETs
195
Yet another important characteristic of the DMOS depletion-mode FET is its
output
impedance
(Z
out
), which can range from a few ohms to more than a Meg ohm. As
mentioned previously, this depends on the FET’s gain (g
fs
), input frequency, internal
source resistance, and the value of the external source load resistor. This often just
approximates to the value of its internal source resistance (r
s
)
,
compared with the
value of the external source resistor (R
S
), which is usually much larger. This internal
source resistance forms a voltage divider with any external ...
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