Datasheet

V
OUT+
R
G
R
G
V
IN-
V
IN+
0.22 F
R
F
R
F
R
O
R
O
R
IT
R
IT
Input From 50-
Test Equipment
No Connection
49.9 
V
OUT±
Installed to Balance
Amplifier
V
S+
THS4531A
V
S±
Measure With
Diff Probe Here
Cal Diff Probe
+
±
V
OCM
THS4531A
www.ti.com SLOS823A –DECEMBER 2012–REVISED JANUARY 2013
Balance Error
The circuit shown in Figure 73 is used to measure the balance error of the main differential amplifier. A network
analyzer is used as the signal source and the measurement device. The output impedance of the network
analyzer is 50Ω and is DC coupled. R
IT
and R
G
are chosen to impedance match to 50Ω and maintain the proper
gain. To balance the amplifier, a 49.9Ω resistor to ground is inserted across R
IT
on the alternate input. The output
is measured using a high impedance differential probe at the summing junction of the two R
O
resistors, with
respect to ground.
Figure 73. Balance Error Test Circuit
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