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參數(shù)資料
| 型號： | LM6181 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 100 mA, 100 MHz Current Feedback Amplifier |
| 中文描述： | 一〇 〇毫安，100 MHz電流反饋放大器 |
| 文件頁數(shù)： | 17/23頁 |
| 文件大?。?/td> | 1848K |
| 代理商： | LM6181 |
Typical Applications
(Continued)
SLEW RATE CONSIDERATIONS
The slew rate characteristics of current feedback amplifiers
are different than traditional voltage feedback amplifiers. In
voltage feedback amplifiers slew rate limiting or non-linear
amplifier behavior is dominated by the finite availability of the
1st stage tail current charging the compensation capacitor.
The slew rate of current feedback amplifiers, in contrast, is
not constant. Transient current at the inverting input deter-
mines slew rate for both inverting and non-inverting gains.
The non-inverting configuration slew rate is also determined
by input stage limitations. Accordingly, variations of slew
rates occur for different circuit topologies.
DRIVING CAPACITIVE LOADS
The LM6181 can drive significantly larger capacitive loads
than many current feedback amplifiers. Although the
LM6181 can directly drive as much as 100 pF without oscil-
lating, the resulting response will be a function of the feed-
back resistor value. Figure 5 illustrates the small-signal
pulse response of the LM6181 while driving a 50 pF load.
Ringing persists for approximately 70 ns. To achieve pulse
responses with less ringing either the feedback resistor can
be increased (see typical curves Suggested R
f
and R
for
C
), or resistive isolation can be used (10
–51
typically
works well). Either technique, however, results in lowering
the system bandwidth.
Figure 6 illustrates the improvement obtained with using a
47
isolation resistor.
DS011328-15
3a: R
f
= 820
DS011328-16
3b: R
f
= 1640
FIGURE 3. Increasing Compensation
with Increasing R
f
DS011328-17
FIGURE 4. Reducing R
f
for Large
Closed Loop Gains, R
f
= 500
DS011328-18
5a
DS011328-19
5b
FIGURE 5. A
= 1, LM6181 Can Directly
Drive 50 pF of Load Capacitance with 70 ns
of Ringing Resulting in Pulse Response
www.national.com
17
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| LM6181AIM-8 | JT 79C 79#22D SKT WALL RECP |
| LM6181IM-8 | 100 mA, 100 MHz Current Feedback Amplifier |
| LM61 | 2.7V, SOT-23 or TO-92 Temperature Sensor |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM6181AIM | 制造商:Texas Instruments 功能描述: |
| LM6181AIM-8 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM6181AIN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:100 mA, 100 MHz Current Feedback Amplifier |
| LM6181AJM | 制造商:Texas Instruments 功能描述: |
| LM6181AMJ/883 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:100 mA, 100 MHz Current Feedback Amplifier |
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