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参数资料
| 型号： | EL2160CS |
| 英文描述： | 130 MHz Current Feedback Amplifier |
| 中文描述： | 130 MHz电流反馈放大器 |
| 文件页数： | 4/16页 |
| 文件大小： | 430K |
| 代理商： | EL2160CS |
EL2160C
130 MHz Current Feedback Amplifier
Applications Information
Product Description
The EL2160C is a current mode feedback amplifi-
er that offers wide bandwidth and good video
specifications at a moderately low supply cur-
rent It is built using Elantec’s proprietary com-
plimentary bipolar process and is offered in in-
dustry standard pin-outs
Due to the current
feedback architecture the EL2160C closed-loop
3 dB bandwidth is dependent on the value of the
feedback resistor First the desired bandwidth is
selected by choosing the feedback resistor RF
and then the gain is set by picking the gain resis-
tor RG The curves at the beginning of the Typi-
cal Performance Curves section show the effect of
varying both RF and RG The 3 dB bandwidth is
somewhat dependent on the power supply volt-
age As the supply voltage is decreased internal
junction capacitances increase causing a reduc-
tion in closed loop bandwidth To compensate for
this smaller values of feedback resistor can be
used at lower supply voltages
Power Supply Bypassing and Printed
Circuit Board Layout
As with any high frequency device good printed
circuit board layout is necessary for optimum
performance Ground plane construction is high-
ly recommended Lead lengths should be as short
as possible below
The power supply pins
must be well bypassed to reduce the risk of oscil-
lation A 10
mF tantalum capacitor in parallel
with a 001
mF ceramic capacitor is adequate for
each supply pin
For good AC performance parasitic capacitances
should be kept to a minimum especially at the
inverting input (see Capacitance at the Inverting
Input section) This implies keeping the ground
plane away from this pin Carbon resistors are
acceptable
while use of wire-wound resistors
should not be used because of their parasitic in-
ductance Similarly capacitors should be low in-
ductance for best performance Use of sockets
particularly for the SO package should be avoid-
ed Sockets add parasitic inductance and capaci-
tance which will result in peaking and overshoot
Capacitance at the Inverting Input
Due to the topology of the current feedback am-
plifier stray capacitance at the inverting input
will affect the AC and transient performance of
the
EL2160C
when
operating
in
the
non-
inverting configuration The characteristic curve
of gain vs frequency with variations of CINb
emphasizes this effect The curve illustrates how
the bandwidth can be extended to beyond
200 MHz with some additional peaking with an
additional 2 pF of capacitance at the VINb pin
for the case of AV ea2 Higher values of capac-
itance will be required to obtain similar effects at
higher gains
In the inverting gain mode added capacitance at
the inverting input has little effect since this
point is at a virtual ground and stray capacitance
is therefore not ‘‘seen’’ by the amplifier
Feedback Resistor Values
The EL2160C has been designed and specified
with RF e 560X for AV ea2 This value of
feedback resistor yields extremely flat frequency
response
with
little
to
no
peaking
out
to
130 MHz As is the case with all current feedback
amplifiers wider bandwidth at the expense of
slight peaking can be obtained by reducing the
value of the feedback resistor Inversely larger
values of feedback resistor will cause rolloff to
occur at a lower frequency By reducing RF to
430
X bandwidth can be extended to 170 MHz
with under 1 dB of peaking Further reduction of
RF to 360X increases the bandwidth to 195 MHz
with about 25 dB of peaking See the curves in
the Typical Performance Curves section which
show 3 dB bandwidth and peaking vs frequency
for various feedback resistors and various supply
voltages
Bandwidth vs Temperature
Whereas many amplifier’s supply current and
consequently 3 dB bandwidth drop off at high
temperature the EL2160C was designed to have
little supply current variations with temperature
An immediate benefit from this is that the 3 dB
bandwidth does not drop off drastically with
temperature With VS e g15V and AV ea2
the bandwidth only varies from 150 MHz to
110 MHz over the entire die junction tempera-
ture range of 0 C k T k 150 C
12
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PDF描述 |
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| EL2160C | 180MHz Current Feedback Amplifier |
| EL2160CM | 180MHz Current Feedback Amplifier |
| EL2160CS-T13 | 180MHz Current Feedback Amplifier |
| EL2160CS-T7 | 180MHz Current Feedback Amplifier |
| EL2170CN | 70 MHz/1 mA Current Mode Feedback Amplifiers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL2160CS-T13 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:180MHz Current Feedback Amplifier |
| EL2160CS-T7 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:180MHz Current Feedback Amplifier |
| EL2166 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:110MHz Current Feedback Amplifier with Disable |
| EL2166CN | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:110MHz Current Feedback Amplifier with Disable |
| EL2166CS | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:110MHz Current Feedback Amplifier with Disable |
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