THS3091 Datasheet, PDF (31/45 Pages) Texas Instruments – HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS

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Application Information (continued)
THS3091, THS3095
SLOS423H – SEPTEMBER 2003 – REVISED DECEMBER 2015
R_IN
R_G
249 Ω
V_S
R_F
1 kΩ
27 pF
V_S
1 kΩ _{_}
+
−V_S
49.9 Ω
5.11 Ω
100-Ω LOAD
1 µF
Figure 67. Driving a Large Capacitive Load Using a Multiple Feedback Loop With Stabilizing Input
Resistor (R_IN)
F_IN
R_G
249 Ω
V_S
R_F
1 kΩ
27 pF
V_S
FB
_
+
−V_S
49.9 Ω
5.11 Ω
100-Ω LOAD
1 µF
Figure 68. Driving a Large Capacitive Load Using a Multiple Feedback Loop With Stabilizing Input Ferrite
Bead (F_IN)
Figure 69 is shown using 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 like when
driving large FET transistors.
1 kΩ
249 Ω
24.9 Ω
V_S
_
+
−V_S
1 kΩ
5.11 Ω
V_S
V_S
1 nF
249 Ω
_
5.11 Ω
+
24.9 Ω
−V_S
Figure 69. Driving a Large Capacitive Load Using 2 Parallel Amplifier Channels
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