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THS4032-EP Datasheet, PDF (23/38 Pages) Texas Instruments – 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS | |||
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THS4031-EP
THS4032-EP
www.ti.com........................................................................................................................................................................................... SLOS610 â NOVEMBER 2008
DRIVING A CAPACITIVE LOAD
Driving capacitive loads with high-performance amplifiers is not a problem as long as certain precautions are
taken. The first is to realize that the THS403x has been internally compensated to maximize its bandwidth and
slew-rate performance. When the amplifier is compensated in this manner, capacitive loading directly on the
output will decrease the phase margin of the device leading to high-frequency ringing or oscillations. Therefore,
for capacitive loads of greater than 10 pF, it is recommended that a resistor be placed in series with the output of
the amplifier, as shown in Figure 55. A minimum value of 20 ⦠should work well for most applications. For
example, in 75-⦠transmission systems, setting the series resistor value to 75 ⦠both isolates any capacitance
loading and provides the proper line impedance matching at the source end.
360 â¦
Input
360 â¦
_
THS403x
+
20 â¦
Output
CLOAD
Figure 55. Driving a Capacitive Load
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): THS4031-EP THS4032-EP
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