August
2004, Issue 169
Test Your
EQ:
|
Answer
8—Because
all four resistors are terminated at voltage sources,
the two inputs of the op-amp see equal DC source resistance
(RX and RY in parallel) for their
bias currents. The voltage offsets caused by these currents
cancel, again to the extent that the resistor values are
well matched.
Contributor:
David Tweed
