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參數(shù)資料
| 型號(hào)： | EL2082 |
| 廠商： | Intersil Corporation |
| 英文描述： | Current Mode Multiplier |
| 中文描述： | 電流模式乘數(shù) |
| 文件頁(yè)數(shù)： | 16/16頁(yè) |
| 文件大小： | 357K |
| 代理商： | EL2082 |
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EL2082C
Current-Mode Multiplier
Applications Information
Contd
Current-feedback amplifiers eliminate this difficulty Because their -input is a very low impedance
capacitance at the summing point of an inverting operational circuit is far less troublesome Here is a
table of results of various current-feedback circuits used in the inverting circuit
Operational
Power
b
3 dB
01 dB
Amplifier
Supplies
Rf
RIN
Rg
Bandwidth
Peaking
EL2020
g
5V
1k
910
29 MHz
43 MHz
0
EL2020
g
15V
1k
910
34 MHz
53 MHz
0
EL2130
g
5V
1k
910
61 MHz
97 MHz
0
EL2030
g
15V
1k
910
82 MHz
123 MHz
0
EL2171
g
5V
2k
18k
1k
114 MHz
11 MHz
12 dB
with the EL2171 the EL2082 had g15V supplies and the EL2171 required a 150
X output load
The EL2120 and EL2090 are suitable in this circuit but they are compensated for 300
X feedback
resistors RIN would have to be reduced greatly to obtain unity gain and the increased signal currents
would cause the EL2082 to display much increased distortion They could be used if the input resistor
were maintained at 910
X and Rf reduced for a b
gain or if Rf e 1k and an overall bandwidth of
25 MHz were acceptable
The EL2082 can also be used within an op-amp’s feedback loop
Gain eb
1V
VGAIN
RFa95X
RIN
J
EL2082 in feedback
inverting gain
2082 – 15
With voltage-mode op-amps the same concern about capacitance at the summing node exists so Cf and
CIN should be used As before current-feedback amplifiers tend to solve the problem However in this
circuit the inherent phase lag of the EL2082 detracts from the phase margin of the op-amp and some
overall bandwidth reduction may result The EL2082 appears as a 30 ns delay well past 100 MHz
Thus for a 20 MHz loop bandwidth the EL2082 will subtract 20 MHz c 30 ns c 360 degrees e 216
degrees The loop path should have at least 55 degrees of phase margin for low ringing in this connec-
tion Loop bandwidth is always reduced by the ratio RIN (RIN a Rf) with voltage mode op-amps
9
TD
is
13in
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL2082C | 制造商:ELANTEC 制造商全稱(chēng):ELANTEC 功能描述:Current-Mode Multiplier |
| EL2082CJ | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog Multiplier |
| EL2082CN | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:Current Mode Multiplier |
| EL2082CS | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:Current Mode Multiplier |
| EL2082J | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog Multiplier |
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