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THS4531A Datasheet, PDF (27/50 Pages) Texas Instruments – Ultra Low Power, Rail-to-Rail Output, Fully-Differential Amplifier | |||
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THS4531A
SLOS823A â DECEMBER 2012 â 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 50⦠and is DC coupled. RIT and RG are chosen to impedance match to 50⦠and maintain the proper
gain. To balance the amplifier, a 49.9⦠resistor to ground is inserted across RIT on the alternate input. The output
is measured using a high impedance differential probe at the summing junction of the two RO resistors, with
respect to ground.
VIN+
Input From 50-
Test Equipment
RG
RF
RO
Cal Diff Probe
VIN-
No Connection
49.9
Installed to Balance
Amplifier
RIT
0.22 F
RG
RIT
VS+
VOUT±
+
VOCM
±
THS4531A
VS±
VOUT+
RO
RF
Measure With
Diff Probe Here
Figure 73. Balance Error Test Circuit
Copyright © 2012â2013, Texas Instruments Incorporated
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