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參數(shù)資料
| 型號(hào)： | EL2286C |
| 英文描述： | 250 MHz/3 mA Dual Current Mode Feedback Amplifier(250 MHz/3 mA，雙路電流模式反饋放大器) |
| 中文描述： | 250兆赫/3毫安雙路電流模式反饋放大器（250兆赫/ 3毫安，雙路電流模式反饋放大器） |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 358K |
| 代理商： | EL2286C |
EL2186CEL2286C
250 MHz3 mA Current Mode Feedback Amp wDisable
Applications Information
Contd
same destabilizing effect as a zero in the forward
open-loop response The use of large value feed-
back and gain resistors further exacerbates the
problem by further lowering the pole frequency
The EL2186CEL2286C have been specially de-
signed to reduce power dissipation in the feed-
back network by using large 750
X feedback and
gain resistors With the high bandwidths of these
amplifiers these large resistor values would nor-
mally cause stability problems when combined
with parasitic capacitance but by internally can-
celing the effects of a nominal amount of parasit-
ic capacitance
the EL2186CEL2286C remain
very stable For less experienced users this fea-
ture makes the EL2186CEL2286C much more
forgiving and therefore easier to use than other
products not incorporating this proprietary cir-
cuitry
The experienced user with a large amount of PC
board layout experience may find in rare cases
that the EL2186CEL2286C have less bandwidth
than expected In this case the inverting input
may have less parasitic capacitance than expected
by the internal compensation circuitry of the
EL2186CEL2286C The reduction of feedback
resistor values (or the addition of a very small
amount of external capacitance at the inverting
input eg 05 pF) will increase bandwidth as de-
sired Please see the curves for Frequency Re-
sponse for Various RF and RG and Frequency
Response for Various CINb
Feedback Resistor Values
The EL2186CEL2286C have been designed and
specified at gains of a1 and a2 with RF e
750
X
This value of feedback resistor gives
250 MHz of b3 dB bandwidth at AV ea1 with
about 25 dB of peaking and 180 MHz of b3dB
bandwidth at AV ea2 with about 01 dB of
peaking Since the EL2186CEL2286C are cur-
rent-feedback amplifiers it is also possible to
change the value of RF to get more bandwidth
As seen in the curve of Frequency Response For
Various RF and RG bandwidth and peaking can
be easily modified by varying the value of the
feedback resistor
Because the EL2186CEL2286C are current-feed-
back amplifiers their gain-bandwidth product is
not a constant for different closed-loop gains
This
feature
actually
allows
the
EL2186C
EL2286C to maintain about the same b3dB
bandwidth regardless of closed-loop gain How-
ever as closed-loop gain is increased bandwidth
decreases slightly while stability increases
Since the loop stability is improving with higher
closed-loop gains it becomes possible to reduce
the value of RF below the specified 750X and still
retain stability resulting in only a slight loss of
bandwidth with increased closed-loop gain
Supply Voltage Range and Single-
Supply Operation
The EL2186CEL2286C have been designed to
operate with supply voltages having a span of
greater than 3V and less than 12V In practical
terms this means that the EL2186CEL2286C
will operate on dual supplies ranging from g15V
to g6V With a single-supply the EL2176C will
operate from a3V to a12V
As supply voltages continue to decrease it be-
comes necessary to provide input and output
voltage ranges that can get as close as possible to
the supply voltages
The EL2186CEL2286C
have an input voltage range that extends to with-
in 1V of either supply So for example on a sin-
gle a5V supply the EL2186CEL2286C have an
input range which spans from 1V to 4V The out-
put range of the EL2186CEL2286C is also quite
large extending to within 1V of the supply rail
On a g5V supply the output is therefore capable
of swinging from b4V to a4V Single-supply
output range is even larger because of the in-
creased negative swing due to the external pull-
down resistor to ground On a single a5V sup-
ply output voltage range is about 03V to 4V
Video Performance
For good video performance an amplifier is re-
quired to maintain the same output impedance
and the same frequency response as DC levels are
changed at the output This is especially difficult
when driving a standard video load of 150
X be-
cause of the change in output current with DC
level Until the EL2186CEL2286C good Differ-
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL2286CN | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:250MHz/3mA Current Mode Feedback Amp w/Disable |
| EL2286CS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL2286CS-T13 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL2286CS-T7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL228-AA-1 | 制造商:SIXNET 制造商全稱:SIXNET 功能描述:Heavy Industrial Ethernet Managed Switch |
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