THS3122 Datasheet, PDF (21/43 Pages) Texas Instruments – LOW-NOISE, HIGH-SPEED, 450 mA CURRENT FEEDBACK AMPLIFIERS

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THS3122, THS3125
SLOS382E – SEPTEMBER 2001 – REVISED MAY 2015
Application Information (continued)
Figure 46 shows a configuration that uses two amplifiers in parallel to double the output drive current to larger
capacitive loads. This technique is used when more output current is needed to charge and discharge the load
faster as when driving large FET transistors.
R_F
+V_S
R_G
5.11 W
24.9 W
-V_S
R_F
+V_S
+V_S
R_G
1 nF
5.11 W
24.9 W
-V_S
Figure 46. Parallel Amplifiers For Higher Output Drive
Figure 47 shows a push-pull FET driver circuit typical of ultrasound applications with isolation resistors to isolate
the gate capacitance from the amplifier.
+V_S
+V_S
5.11 W
-V_S
R_F
2R_G
R_F
+V_S
5.11 W
-V_S
-V_S
Figure 47. Powerfet Drive Circuit
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