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THS4531 Datasheet, PDF (31/54 Pages) Texas Instruments – Ultra Low Power, Rail-to-Rail Output, Fully-Differential Amplifier | |||
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THS4531
www.ti.com
SLOS358B â SEPTEMBER 2011 â REVISED MARCH 2012
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-Ω
Test Equipment
Cal Diff Probe
RG
RIT
VIN-
No Connection
49.9 Ω
Installed to Balance
Amplifier
0.22 μF
RG
RIT
RF
RO
VS+
+
VOCM
â
VOUTâ
THS4531
VSâ
VOUT+
RO
RF
Measure With
Diff Probe Here
Figure 73. Balance Error Test Circuit
Copyright © 2011â2012, Texas Instruments Incorporated
Product Folder Link(s): THS4531
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