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THS4521 Datasheet(PDF) 29 Page - Texas Instruments

Part # THS4521
Description  Ultra Low Power, Rail-to-Rail Output, Fully-Differential Amplifier
PDF  58 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

THS4521 Datasheet(HTML) 29 Page - Texas Instruments

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VOUT+
RG
RG
VIN-
VIN+
0.22 μF
RF
RF
RO
RO
RIT
RIT
Input From 50-Ω
Test Equipment
No Connection
49.9 Ω
VOUT–
Installed to Balance
Amplifier
VS+
THS4531
VS–
Measure With
Diff Probe Here
Cal Diff Probe
+
–
VOCM
29
THS4531
www.ti.com
SLOS358C – SEPTEMBER 2011 – REVISED APRIL 2020
Product Folder Links: THS4531
Submit Documentation Feedback
Copyright © 2011–2020, Texas Instruments Incorporated
9.1.6 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
Ω and is DC coupled. RIT and RG are chosen to impedance match to 50 Ω and maintain the
proper gain. To balance the amplifier, a 49.9
Ω 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.
Figure 73. Balance Error Test Circuit



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