August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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246
Using CMOS linear arrays to create current sources
The circuit shown uses the ALD-1107, a monolithic matched P-channel quad transis-
tor array, and as a result good performance can be achieved. Remember too that
because the devices all share the same substrate, there will be excellent thermal
matching. This quad transistor device is available in either a 14-pin DIP or a 14-pin SO
surface-mount package.
The circuits in Figure 9.6 show two different cascode current sources using two
matched P-channel pairs (Duals: ALD-1102, 1117; or Quad: ALD-1107). In circuit A,
(a true cascode), both Q
1
and Q
3
are diode-connected (Figure 9.6C), and as a result
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