THS4531
SLOS358B –SEPTEMBER 2011–REVISED MARCH 2012
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Power
Supply
Network
Analyzer
Cal Diff Probe
RO
VIN+
RG
RF
No Connection
VS+
RIT
VOUT–
+
VOCM
–
Measure With
Diff Probe
THS4531
VOUT+
RO
ROT
0.22 μF
RG
VS–
VIN–
No Connection
RF
RIT
Figure 71. PSRR Test Circuit
VOCM Input
The circuit shown in Figure 72 is used to measure the transient response, frequency response and input
impedance of the VOCM input. For these tests, the cal point is across the 49.9Ω VOCM termination resistor.
Transient response and frequency response are measured with RCM = 0Ω and using a high impedance
differential probe at the summing junction of the two RO resistors, with respect to ground. The input impedance is
measured using a high impedance differential probe at the VOCM pin and the drop across RCM is used to calculate
the impedance seen looking into the amplifier’s VOCM input.
VIN+
RG
RF
RO
No Connection
RIT
For BW
Measure With
Diff Probe Here
VS+
VOUTœ
THS4531
VOUT+
VOCM
RCM
+
From Network
Analyzer
VOCM
-
For ZIN
Measure With
Diff Probe Here
49.9 ꢀ
VSœ
Cal Diff Probe
VINœ
RG
RO
No Connection
RF
RIT
NC
Figure 72. VOCM Input Test Circuit
30
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