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參數(shù)資料
| 型號(hào)： | EL2074C |
| 英文描述： | 400 MHz Voltage-Feedback Amplifier(400MHz電壓反饋放大器) |
| 中文描述： | 400 MHz的電壓反饋放大器（400MHz的電壓反饋放大器） |
| 文件頁(yè)數(shù)： | 12/12頁(yè) |
| 文件大小： | 333K |
| 代理商： | EL2074C |
EL2074C
400 MHz GBWP Gain-of-2 Stable Operational Amplifier
Applications Information
Product Description
The EL2074 is a wideband monolithic operation-
al amplifier built on a high-speed complementary
bipolar process The EL2074 uses a classical volt-
age-feedback topology which allows it to be used
in a variety of applications requiring a noise gain
t
2 where current-feedback amplifiers are not ap-
propriate because of restrictions placed upon the
feedback element used with the amplifier The
conventional topology of the EL2074 allows for
example a capacitor to be placed in the feedback
path making it an excellent choice for applica-
tions such as active filters sample-and-holds or
integrators Similarly because of the ability to
use diodes in the feedback network the EL2074
is an excellent choice for applications such as log
amplifiers
The EL2074 also has excellent DC specifications
200
mV VOS 2 mAIB 01 mAIOS and 90 dB of
CMRR These specifications allow the EL2074 to
be used in DC-sensitive applications such as dif-
ference amplifiers
Furthermore
the current
noise of the EL2074 is only 32 pA
0Hz making
it an excellent choice for high-sensitivity trans-
impedance amplifier configurations
Gain-Bandwidth Product
The EL2074 has a gain-bandwidth product of
400 MHz For gains greater than 8 its closed-
loop b3 dB bandwidth is approximately equal to
the gain-bandwidth product divided by the noise
gain of the circuit For gains less than 8 higher-
order poles in the amplifier’s transfer function
contribute to even higher closed loop band-
widths For example the EL2074 has a b3dB
bandwidth of 400 MHz at a gain of a2 dropping
to 200 MHz at a gain of a4 It is important to
note that the EL2074 has been designed so that
this ‘‘extra’’ bandwidth in low-gain applications
does not come at the expense of stability As seen
in the typical performance curves the EL2074 in
a gain of a2 only exhibits 1 dB of peaking with a
100
X load
Parasitic Capacitances and Stability
When used in positive-gain configurations the
EL2074 can be quite sensitive to parasitic capaci-
tances at the inverting input especially with val-
ues t250
X for the gain resistor The problem
stems from the feedback and gain resistance in
conjunction with the approximately 3pF of
board-related parasitic capacitance from the in-
verting input to ground Assuming a gain-of-2
configuration with RfeRge250
X a feedback
pole occurs at 424 MHz which is equivalent to a
zero in the forward path at the same frequency
This zero reduces stability by reducing the effec-
tive phase-margin from about 50 to about 30
A common solution to this problem is to add an
additional capacitor from the inverting input to
the output This capacitor in conjunction with
the parasitic capacitance maintains a constant
voltage-divider between the output and the in-
verting input This technique is used for AC test-
ing of the EL2074 A 3pF capacitor is placed in
parallel with the feedback resistor for all AC
tests When this capacitor is used it is also possi-
ble to increase the resistance values of the feed-
back and gain resistors without loss of stability
resulting in less loading of the EL2074 from the
feedback network
Video Performance
An industry-standard method of measuring the
video distortion of a component such as the
EL2074 is to measure the amount of differential
gain (dG) and differential phase (dP) that it in-
troduces
To
make
these
measurements
a
0286 VPP (40 IRE) signal is applied to the device
with 0V DC offset (0 IRE) at either 358 MHz for
NTSC
443 MHz for PAL
or 30 MHz for
HDTV A second measurement is then made at
0714V DC offset (100 IRE) Differential gain is a
measure of the change in amplitude of the sine
wave and is measured in percent Differential
phase is a measure of the change in phase and is
measured in degrees
9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EL2075C | 2 GHz Voltage-Feedback Amplifier(2 GHz 電壓反饋放大器) |
| EL2075 | 2GHz GBWP Gain-of-10 Stable Operational Amplifier |
| EL2075CN | 2GHz GBWP Gain-of-10 Stable Operational Amplifier |
| EL2075CS | 2GHz GBWP Gain-of-10 Stable Operational Amplifier |
| EL2082CJ | Analog Multiplier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL2074CN | 制造商:ELANTEC 制造商全稱:ELANTEC 功能描述:400MHz GBWP Gain-of-2 Stable Operational Amplifier |
| EL2074CS | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:400MHz GBWP Gain-of-2 Stable Operational Amplifier |
| EL2074CS-T13 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:400MHz GBWP Gain-of-2 Stable Operational Amplifier |
| EL2074CS-T7 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:400MHz GBWP Gain-of-2 Stable Operational Amplifier |
| EL2074J/883B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
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