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參數(shù)資料
| 型號： | LT1227M |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 140MHz Video Current Feedback Amplifier |
| 中文描述： | 140MHz的視頻電流反饋放大器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 326K |
| 代理商： | LT1227M |
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LT1227
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PLI IED S
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The LT1227 is a very fast current feedback amplifier.
Because it is a current feedback amplifier, the bandwidth
is maintained over a wide range of voltage gains. The
amplifier is designed to drive low impedance loads such as
cables with excellent linearity at high frequencies.
O
PPLICATI
U
U
Feedback Resistor Selection
The small-signal bandwidth of the LT1227 is set by the
external feedback resistors and the internal junction ca-
pacitors. As a result, the bandwidth is a function of the
supply voltage, the value of the feedback resistor, the
closed-loop gain and load resistor. The characteristic
curves of Bandwidth vs Supply Voltage show the effect of
a heavy load (100
) and a light load (1k). These curves
use a solid line when the response has less than 0.5dB of
peaking and a dashed line when the response has 0.5dB to
5dB of peaking. The curves stop where the response has
more than 5dB of peaking.
At a gain of two, on
±
15V supplies with a 1k feedback
resistor, the bandwidth into a light load is over 140MHz,
but into a heavy load the bandwidth reduces to 120MHz.
The loading has this effect because there is a mild reso-
nance in the output stage that enhances the bandwidth at
light loads but has its Q reduced by the heavy load. This
enhancement is only useful at low gain settlings; at a gain
of ten it does not boost the bandwidth. At unity gain, the
enhancement is so effective the value of the feedback
resistor has very little effect. At very high closed-loop
gains, the bandwidth is limited by the gain bandwidth
product of about 1GHz. The curves show that the band-
width at a closed-loop gain of 100 is 12MHz, only one tenth
what it is at a gain of two.
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6 V
OUT
4 V
–
7
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+
2
–IN
+IN
3
CURRENT
SOURCE
BIAS
8
S/D
14k
1
5
1227 SS
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
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| LT1227MJ8 | 制造商:Linear Technology 功能描述:OP Amp Single Current Fdbk 15V 8-Pin CDIP |
| LT1228 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228_07 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228_12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback |
| LT1228C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
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