Datasheet

www.ti.com
t − Time − ns
4
−4
0
−8
12
8
0 302010 40 50 7060 80 90 100
16
−12
−16
G048
V
O
− Output Voltage − V
SR ≅ 1300 V/µs
V
CC
= ±15 V
Gain = 5
R
F
= 1 kΩ
R
L
= 50 Ω
t
r/
t
f
= 10 ns
t − Time − ns
4
−4
0
−8
12
8
0 302010 40 50 7060 80 90 100
16
−12
−16
G049
V
O
− Output Voltage − V
SR = 3500 V/µs
V
CC
= ±15 V
Gain = 5
R
L
= 1 kΩ
R
F
= 50 Ω
t
r/
t
f
= 900 ns
Driving a Capacitive Load
+
_
THS6022
C
LOAD
1kW
Input
Output
1kW
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
Submit Documentation Feedback