I was looking at the schematics for the Fluke 731 and 732 voltage
references. these, and several other brands and models of voltage
references, use the same or similar reference ICs as their basis. The
reference ICs are a Zener/NPN transistor pair on a single substrate.
Please view in a fixed-width font such
as Courier.
|
|
C |
|
\ |
\|
|----
| B
/|
/ |
E |
|
+---------------
|
/------/
/ \
------
|
|
Just thinking... would it be possible to make a reference with similar
characteristics with discrete components (a low tempco Zener and a
transistor)? They would likely have to be closely coupled thermally and
maintained at a constant temperature within an oven or by a peltier device.
What criteria would apply to the selection of the parts?
Dave M
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