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参数资料
| 型号： | THS3111IDRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封装： | GREEN, PLASTIC, SOIC-8 |
| 文件页数： | 10/37页 |
| 文件大小： | 980K |
| 代理商： | THS3111IDRG4 |
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_
+
VS
-VS
49.9
806
Ferrite Bead
1
F
200
VS
100
LOAD
0
10
20
30
40
50
60
10
100
CL - Capacitive Load - pF
Recommended
R
Gain = 5,
RL = 100 ,
VS = ±15 V
ISO
-
_
+
VS
-VS
49.9
806
5.11
1
F
200
VS
100
LOAD
RISO
_
+
VS
-VS
49.9
5.11
1
F
200
VS
27 pF
806
RF
RG
750
100
LOAD
RIN
SLOS422E – SEPTEMBER 2003 – REVISED OCTOBER 2009........................................................................................................................................ www.ti.com
Driving Capacitive Loads
frequency load independence of the amplifier while
isolating the phase shift caused by the capacitance at
Applications such as FET drivers and line drivers can
high frequency. Use a ferrite chip with similar
be highly capacitive and cause stability problems for
impedance to RISO, 20 to 50 , at 100 MHz and
high-speed amplifiers.
low impedance at dc.
methods for driving capacitive loads. The basic idea
is to use a resistor or ferrite chip to isolate the phase
shift at high frequency caused by the capacitive load
from the amplifier feedback path. See Figure 55 for
recommended resistor values versus capacitive load.
Figure 57. Ferrite Bead to Isolate Capacitive Load
Figure 58 shows another method used to maintain
the low frequency load independence of the amplifier
while isolating the phase shift caused by the
capacitance at high frequency. At low frequency,
feedback is mainly from the load side of RISO. At high
frequency, the feedback is mainly via the 27-pF
Figure 55. Recommended RISO vs Capacitive
capacitor. The resistor RIN in series with the negative
Load
input is used to stabilize the amplifier and should be
equal to the recommended value of RF at unity gain.
Replacing RIN with a ferrite of similar impedance at
Placing a small series resistor, RISO, between the
about 100 MHz as shown in Figure 59 gives similar
amplifier output and the capacitive load, as shown in
results with reduced dc offset and low frequency
Figure 56, is an easy way of isolating the load
noise. (See the Additional Reference Material section
capacitance.
for
expanding
the
usability
of
current-feedback
amplifiers.)
Figure 56. Resistor to Isolate Capacitive Load
Using a ferrite chip in place of RISO, as shown in
Figure 57, is another approach of isolating the output
Figure 58. Feedback Technique with Input
of the amplifier. The ferrite impedance characteristic
Resistor for Capacitive Load
versus frequency is useful to maintain the low
18
Copyright 2003–2009, Texas Instruments Incorporated
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