Datasheet

5V
CM
V
IN
From
source
49.9 W
0.22 Fm
R
F
R
F
R
G
R
G
R
IT
R
IT
V
OUT+
V
OUT–
To
50-W
Test
Equipment
R
CMT
R
CM
THS4511
50-W
49.9 W
0.22 Fm
49.9 W
49.9 W
THS4511
CM
V
IN
R
F
R
F
R
G
R
G
R
IT
R
IT
From
50-W
Source
0.22 Fm
49.9 W
V
OUT+
Open
To50-W
Test
Equipment
5V
0.22 Fm
V
OUT-
49.9 W
49.9 W
From
50 W
Source
THS4511
CM
V
IN
CMRR
PSRR+
PSRR-
V
S+
V
S-
5V
100 W
100 W
69.8 W
348 W
348 W
49.9 W
49.9 W
Open
0.22 Fm
100 W
Output
Measured
Here
WithHigh
Impedance
Differential
Probe
THS4511
SLOS471E SEPTEMBER 2005REVISED NOVEMBER 2009
www.ti.com
S-Parameter, Slew Rate, Transient Response,
Settling Time, Output Impedance, Overdrive,
Output Voltage, and Turn-On/Off Time
The circuit shown in Figure 40 is used to measure
s-parameters, slew rate, transient response, settling
time, output impedance, overdrive recovery, output
voltage swing, and turn-on/turn-off times of the
amplifier. For output impedance, the signal is injected
at V
OUT
with V
IN
left open and the drop across the
49.9- resistor is used to calculate the impedance
seen looking into the amplifier output.
Figure 41. CM Input Test Circuit
Because S
21
is measured single-ended at the load
with 50- double termination, add 12 dB to refer to
CMRR and PSRR
the amplifier output as a differential signal.
The circuit shown in Figure 42 is used to measure the
CMRR and PSRR of V
S+
and V
S–
. The input is
switched appropriately to match the test being
performed.
Figure 40. S-Parameter, SR, Transient Response,
Settling Time, Z
O
, Overdrive Recovery, V
OUT
Swing, and Turn-On/Off Test Circuit
Figure 42. CMRR and PSRR Test Circuit
CM Input
The circuit shown in Figure 41 is used to measure the
frequency response and input impedance of the CM
input. Frequency response is measured single-ended
at V
OUT+
or V
OUT–
with the input injected at V
IN
, R
CM
=
0 , and R
CMT
= 49.9 . The input impedance is
measured with R
CM
= 49.9 with R
CMT
= open, and
calculated by measuring the voltage drop across R
CM
to determine the input current.
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