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參數(shù)資料
| 型號(hào)： | THS3121IDRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 9/35頁 |
| 文件大小： | 975K |
| 代理商： | THS3121IDRG4 |
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0
10
20
30
40
50
60
10
100
CL Capacitive Load pF
Recommended
R
Gain = 5,
RL = 50 ,
VS = ±15 V
ISO
Resistance
_
+
VS
-VS
49.9
499
5.11
1
F
124
VS
100
LOAD
RISO
_
+
VS
-VS
49.9
5.11
1
F
124
VS
27 pF
499
RF
RG
750
100
LOAD
RIN
_
+
VS
-VS
49.9
499
Ferrite Bead
1
F
124
VS
100
LOAD
www.ti.com........................................................................................................................................ SLOS420E – SEPTEMBER 2003 – REVISED OCTOBER 2009
Driving Capacitive Loads
Placing a small series resistor, RISO, between the
amplifier output and the capacitive load, as shown in
Applications such as FET drivers and line drivers can
Figure 52, is an easy way of isolating the load
be highly capacitive and cause stability problems for
capacitance.
high-speed amplifiers.
Using a ferrite chip in place of RISO, as shown in
Figure 53, is another approach of isolating the output
methods for driving capacitive loads. The basic idea
of the amplifier. The ferrite impedance characteristic
is to use a resistor or ferrite chip to isolate the phase
versus frequency is useful to maintain the low
shift at high frequency caused by the capacitive load
frequency load independence of the amplifier while
from the amplifier feedback path. See Figure 51 for
isolating the phase shift caused by the capacitance at
recommended resistor values versus capacitive load.
high frequency. Use a ferrite chip with similar
impedance to RISO, 20 to 50 , at 100 MHz and
low impedance at dc.
Figure 54 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
capacitor. The resistor RIN in series with the negative
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 chip of similar impedance
at about 100 MHz as illustrated in Figure 55 gives
similar results with reduced dc offset and low
frequency noise. (See the Additional Reference
Figure 51. Recommended RISO vs Capacitive
section
for
expanding
the
usability
of
Load
current-feedback amplifiers.)
Figure 52. Resistor to Isolate Capacitive Load
Figure 54. Feedback Technique with Input
Resistor for Capacitive Load
Figure 53. Ferrite Bead to Isolate Capacitive Load
Copyright 2003–2009, Texas Instruments Incorporated
17
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| THS3122CDDAR | 功能描述:高速運(yùn)算放大器 Dual High Output Current 120-MHz RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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