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t − Time − ns

4

−4

0

−8

12

8

0

30

20

10

40

50

70

60

80

90

100

16

−12

−16

G048

SR

≅ 1300 V/µs

Gain = 5

t − Time − ns

4

−4

0

−8

12

8

0

30

20

10

40

50

70

60

80

90

100

16

−12

−16

G049

SR = 3500 V/

µs

Gain = 5

Driving a Capacitive Load

+

_

THS6022

C

LOAD

1kW

Input

Output

1kW

15 W

S0278-02

THS6022

SLOS225D – SEPTEMBER 1998 – REVISED JULY 2007

SLEW RATE—SATURATION

SLEW RATE—LINEAR

Figure 53.

Figure 54.

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 THS6022 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 decreases the device phase margin, 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 15

Ω should work well for most applications. For

example, in 75-

Ω transmission systems, setting the series resistor value to 75 Ω both isolates any capacitance

loading and provides the proper line impedance matching at the source end.

Figure 55. Driving a Capacitive Load

27

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