Datasheet

Inverting Stage (Channel 1) Operation
3-3
Circuit Design Examples
V
output
+
R
termination
R
g
R
termination
)R
g
R
source
)
R
termination
R
g
R
termination
)R
g
+
49.9 750
49.9)750
50 )
49.9 750
49.9)750
+ 0.483 peak
This can also be viewed as the Thevenin equivalent voltage looking into
the source at J4 of the EVM.
- From the EVM side. The Thevenin equivalent resistance of the EVM plus
the source—looking towards the source from the inverting input of the op
amp is:
R
th
+ R
g
)
R
source
R
termination
R
source
) R
termination
+ 750 )
50 49.9
50 ) 49.9
+ 774.97 W
Therefore, the inverting gain on a 0.5-Vpeak ideal voltage source
(assumed to be embedded in the function generator) is:
V
output
+ –V
in
R
f
R
g
+ –0.5
750
774.97
+ –0.483 peak
The two results are identical and therefore equivalent.