December 2003
Intermediate to advanced
320 pages
9h 28m
English
Content preview from Analog Interfacing to Embedded Microprocessor Systems, 2nd Edition
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Using the noninverting opamp circuit we’ve been looking at, suppose that the
resistors have a 100 ppm temperature coefficient, and the resistors have nominal
value at 25
C. If the 10 K resistor is next to a power IC that raises the tempera-
ture of the resistor by 10
C, what happens? Using the preceding equation, we get
a new resistance of 10,010 ohms. This changes the (ideal) opamp gain from 6 to
5.995. The output voltage goes from 7.2 to 7.194 volts—no appreciable effect on
the 8-bit system we’ve been looking at, but a 1-bit error in a 10-bit system, and a
2-bit error in a 12-bit system.
This example is a bit contrived to illustrate the point, because ...
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