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參數(shù)資料
| 型號： | LT1228IS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CRNT FEEDBK AMP 100MHZ 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 3500 V/µs |
| -3db帶寬： | 100MHz |
| 電流 - 輸入偏壓： | 10µA |
| 電壓 - 輸入偏移： | 3000µV |
| 電流 - 電源： | 6mA |
| 電流 - 輸出 / 通道： | 125mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
LT1228
12
1228fd
APPLICATIONS INFORMATION
show the effect of loading. These graphs also show the
family of curves that result from various values of the
feedback resistor. These curves use a solid line when the
response has less than 0.5dB of peaking and a dashed line
for the response with 0.5dB to 5dB of peaking. The curves
stop where the response has more than 5dB of peaking.
Current Feedback Amp Small-Signal Response
VS = ±15V, RF = RG = 750, RL = 100
Capacitance on the Inverting Input
Current feedback amplifiers want resistive feedback from
the output to the inverting input for stable operation. Take
care to minimize the stray capacitance between the output
and the inverting input. Capacitance on the inverting input
to ground will cause peaking in the frequency response
(and overshoot in the transient response), but it does
not degrade the stability of the amplifier. The amount of
capacitance that is necessary to cause peaking is a func-
tion of the closed-loop gain taken. The higher the gain,
the more capacitance is required to cause peaking. For
example, in a gain of 100 application, the bandwidth can
be increased from 10MHz to 17MHz by adding a 2200pF
capacitor, as shown below. CG must have very low series
resistance, such as silver mica.
At a gain of two, on ±15V supplies with a 750 feedback
resistor, the bandwidth into a light load is over 160MHz
without peaking, but into a heavy load the bandwidth re-
duces to 100MHz. The loading has so much effect because
there is a mild resonance 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
settings, at a gain of ten it does not boost the bandwidth.
At unity gain, the enhancement is so effective the value of
thefeedbackresistorhasverylittleeffectonthebandwidth.
At very high closed-loop gains, the bandwidth is limited
by the gain-bandwidth product of about 1GHz. The curves
show that the bandwidth at a closed-loop gain of 100 is
10MHz, only one tenth what it is at a gain of two.
LT1228 TA08
–
+
CG
RG
5.1
RF
510Ω
VOUT
CFA
VIN
6
1
8
Boosting Bandwidth of High Gain Amplifier
with Capacitance On Inverting Input
FREQUENCY (MHz)
1
19
GAIN
(dB)
22
25
28
31
46
49
10
100
LT1228 TA09
34
37
40
43
CG = 4700pF
CG = 2200pF
CG = 0
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相關(guān)代理商/技術(shù)參數(shù) |
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| LT1228M | 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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| LT1229 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual and Quad 100MHz Current Feedback Amplifiers |
| LT1229C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual and Quad 100MHz Current Feedback Amplifiers |
| LT1229CJ8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual and Quad 100MHz Current Feedback Amplifiers |
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