THS3491 Datasheet, PDF (16/28 Pages) Texas Instruments – 900-MHz, High-Power Output, Current Feedback Amplifier

THS3491
SBOS875 – AUGUST 2017
www.ti.com
9.2 Typical Application
The fundamental concept of load sharing is to drive a load using two or more of the same operational amplifiers.
Each amplifier is driven by the same source. Figure 14 shows two THS3491 amplifiers sharing the same load.
This concept effectively reduces the current load of each amplifier by 1/N, where N is the number of amplifiers.
a) Single THS3491 Amplifier Driving a Transmission Line
RG1
143
RF1
576
RSOURCE
50
+
VIN
15 V
-
RS3
50
+ _U3
RT3
THS3491
50
±15 V
50 Ÿ 7UDQVPLVVLRQ /LQH
(TL1)
VOUT
RLOAD
50
b) Two THS3491 Amplifiers Driving a Transmission Line
RG1
143
RF1
576
RSOURCE
50
+
VIN
15 V
-
RS2
100
+ _U1
RT1
THS3491
100
±15 V
RG2
143
RF2
576
15 V
±
RS2
100
+ _U2
RT2
THS3491
100
±15 V
50-Ÿ 7UDQVPLVVLRQ /LQH
(TL2)
VOUT
RLOAD
50
Copyright © 2017, Texas Instruments Incorporated
Figure 14. Load Sharing Driver Application
16
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