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参数资料
| 型号： | EL2170C |
| 英文描述： | 70 MHz/1 mA Single Current Mode Feedback Amplifier(70 MHz/1 mA，单路电流模式反馈放大器) |
| 中文描述： | 70兆赫/1毫安单电流模式反馈放大器（70兆赫/ 1毫安，单路电流模式反馈放大器） |
| 文件页数： | 3/16页 |
| 文件大小： | 330K |
| 代理商： | EL2170C |
EL2170CEL2270CEL2470C
70 MHz1 mA Current Mode Feedback Amplifiers
Applications Information
Contd
The experienced user with a large amount of PC
board layout experience may find in rare cases
that the EL2170CEL2270CEL2470C have less
bandwidth than expected The reduction of feed-
back resistor values (or the addition of a very
small amount of external capacitance at the in-
verting input e g 05 pF) will increase band-
width as desired Please see the curves for Fre-
quency Response for Various RF and RG and
Frequency Response for Various CINb
Feedback Resistor Values
The EL2170CEL2270CEL2470C have been de-
signed and specified at gains of a1 and a2 with
RF e 1kX This value of feedback resistor gives
70 MHz of b3 dB bandwidth at AV ea1 with
about 15 dB of peaking and 60 MHz of b3dB
bandwidth at AV ea2 with about 05 dB of
peaking Since the EL2170CEL2270CEL2470C
are current-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 EL2170CEL2270CEL2470C are
current-feedback
amplifiers
their
gain-band-
width product is not a constant for different
closed-loop gains This feature actually allows
the EL2170CEL2270CEL2470C to maintain
about the same b3 dB bandwidth regardless of
closed-loop gain However as closed-loop gain is
increased bandwidth decreases slightly while sta-
bility increases Since the loop stability is im-
proving with higher closed-loop gains it becomes
possible to reduce the value of RF below the spec-
ified 1 k
X 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 EL2170CEL2270CEL2470C have been de-
signed to operate with supply voltages having a
span of greater than 3V and less than 12V In
practical terms this means that the EL2170C
EL2270CEL2470C will operate on dual supplies
ranging from g15V to g6V With a single-sup-
ply the EL2170CEL2270CEL2470C will oper-
ate 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 EL2170CEL2270C
EL2470C have an input voltage range that ex-
tends to within 1V of either supply So for exam-
ple
on a single a5V supply
the EL2170C
EL2270CEL2470C have an input range which
spans from 1V to 4V The output range of the
EL2170CEL2270CEL2470C is also quite large
extending to within 1V of the supply rail On a
g
5V supply the output is therefore capable of
swinging from b4V to a4V Single-supply out-
put range is even larger because of the increased
negative swing due to the external pull-down re-
sistor to ground On a single a5V supply 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 EL2170CEL2270CEL2470C
good Differential Gain could only be achieved by
running high idle currents through the output
transistors (to reduce variations in output imped-
ance) These currents were typically more than
the entire 1 mA supply current of each EL2170C
EL2270CEL2470C amplifier
Special circuitry
has
been
incorporated
in
the
EL2170C
EL2270CEL2470C to reduce the variation of
output impedance with current output This re-
sults in dG and dP specifications of 015% and
015 while driving 150
X at a gain of a2
11
相关PDF资料 |
PDF描述 |
|---|---|
| EL2176C | 70 MHz/1 mA Current Mode Feedback Amp w/Disable |
| EL2176CN | 70 MHz/1 mA Current Mode Feedback Amp w/Disable |
| EL2176CS | 70 MHz/1 mA Current Mode Feedback Amp w/Disable |
| EL2180CW-T13 | 250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2180CW-T7 | 250MHz / 3mA Current Mode Feedback Amplifiers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL2170CN | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:70MHz/1mA Current Mode Feedback Amplifiers |
| EL2170CS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL2170CS-T13 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:70MHz/1mA Current Mode Feedback Amplifiers |
| EL2170CS-T7 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:70MHz/1mA Current Mode Feedback Amplifiers |
| EL2170CW | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:70 MHz/1 mA Current Mode Feedback Amplifiers |
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