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參數(shù)資料
| 型號： | LM6181IM-8 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 100 mA, 100 MHz Current Feedback Amplifier |
| 中文描述： | VIDEO AMPLIFIER, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 16/23頁 |
| 文件大小： | 1848K |
| 代理商： | LM6181IM-8 |
Typical Applications
CURRENT FEEDBACK TOPOLOGY
For a conventional voltage feedback amplifier the resulting
small-signal bandwidth is inversely proportional to the de-
sired gain to a first order approximation based on the
gain-bandwidth concept. In contrast, the current feedback
amplifier topology, such as the LM6181, transcends this limi-
tation to offer a signal bandwidth that is relatively indepen-
dent of the closed-loop gain. Figure 1a and Figure 1b illus-
trate that for closed loop gains of 1 and 5 the resulting
pulse fidelity suggests quite similar bandwidths for both
configurations.
The closed-loop bandwidth of the LM6181 depends on the
feedback resistance, R
. Therefore, R
and not R
, must be
varied to adjust for the desired closed-loop gain as in Figure
2
POWER SUPPLY BYPASSING AND LAYOUT
CONSIDERATIONS
A fundamental requirement for high-speed amplifier design
is adequate bypassing of the power supply. It is critical to
maintain a wideband low-impedance to ground at the ampli-
fiers supply pins to insure the fidelity of high speed amplifier
transient signals. 10 μF tantalum and 0.1 μF ceramic bypass
capacitors are recommended for each supply pin. The by-
pass capacitors should be placed as close to the amplifier
pins as possible (0.5" or less).
FEEDBACK RESISTOR SELECTION: R
f
Selecting the feedback resistor, R
, is a dominant factor in
compensating the LM6181. For general applications the
LM6181 will maintain specified performance with an 820
feedback resistor. Although this value will provide good re-
sults for most applications, it may be advantageous to adjust
this value slightly. Consider, for instance, the effect on pulse
responses with two different configurations where both the
closed-loop gains are 2 and the feedback resistors are 820
and 1640
, respectively. Figure 3a and Figure 3b illustrate
the effect of increasing R
while maintaining the same
closed-loop gain— the amplifier bandwidth decreases. Ac-
cordingly, larger feedback resistors can be used to slow
down the LM6181 (see 3 dB bandwidth vs R
typical curves)
and reduce overshoot in the time domain response. Con-
versely, smaller feedback resistance values than 820
can
be used to compensate for the reduction of bandwidth at
high closed loop gains, due to 2nd order effects. For ex-
ample Figure 4 illustrates reducing R
to 500
to establish
the desired small signal response in an amplifier configured
for a closed loop gain of 25.
DS011328-12
1a
DS011328-13
1b
FIGURE 1. 1a, 1b: Variation of Closed Loop Gain
from 1 to 5 Yields Similar Responses
DS011328-14
FIGURE 2. R
Is Adjusted to Obtain
the Desired Closed Loop Gain, A
VCL
www.national.com
16
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM6181IM-8/NOPB | 功能描述:運算放大器 - 運放 100Mhz Crnt FB Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LM6181IM-8/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LM6181IMX | 功能描述:IC AMP CURR FEEDBK 100MHZ 16SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:VIP™ II 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR) |
| LM6181IMX/NOPB | 制造商:Texas Instruments 功能描述:OP Amp Single Current Fdbk |
| LM6181IMX-8 | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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