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參數(shù)資料
| 型號： | EL4083C |
| 英文描述： | Current Mode Four Quadrant Multiplier |
| 中文描述： | 電流型四象限乘法器 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 283K |
| 代理商： | EL4083C |
EL4083C
Current Mode Four Quadrant Multiplier
General Operating Information
Contd
rameters and to some extent bandwidth while
improving the signal to noise performance feed-
through and control range
The EL4083 is fundamentally different from con-
ventional voltage mode multipliers in that the
available input range can be tailored to accom-
modate voltage sources of almost any size by se-
lecting appropriate input series resistor values If
desired one can interface with voltages that are
much greater than the supplies from which the
part is powered Current source signals can be
connected directly to the multiplier inputs The
parts’ dynamic range can also be tailored to a
large extent for a current signal by the appropri-
ate selection of IZ These inputs act in the same
manner as a virtual ground input of an opera-
tional amplifier and thus can serve as a summing
node for any number of voltage andor current
signals Outputs of components such as current
output DACs transconductance amplifiers and
current conveyors can be directly connected to
the inputs
Ideally a multiplier should give zero output if
either one of its multiplying inputs is zero A
nonzero output under these conditions is caused
by a combination of input and output referred
offsets An output referred offset can be thought
of as a fixed value added to the output and thus
only affects DC accuracy An input referred off-
set at a multiplying input allows signal to feed-
through from the other multiplying input to the
output(s) The EL4083 is trimmed during testing
at Elantec for X and Y input referred offset for IZ
e
16 mA The internal trim networks provide a
current to each input which nulls the feed-
through caused by internal device mismatches
These current values are ratioed to the value of
IZ so that the input referred nulls are largely
maintained at different values of IZ However
there will be some mistracking in the trim net-
works so that the input referred null point will
deviate away from zero at values of IZ lower than
16 mA Figure 9 shows optional external input
and output referred offset trim networks which
can be used as needed to improve performance
As mentioned the output referred offset only af-
fects DC accuracy which may not be an issue in
AC applications In gain control applications
one may only need to null feedthrough with re-
spect to the gain control input
In gain control (VCA) applications the X input
should be used as the control input and the signal
applied to the Y input since it has slightly higher
bandwidth and better linearity and distortion
performance
Current Outputs (IXY IXY) Feedthrough
and Distortion
Another unique feature of the EL4083 is the dif-
ferential ground referenced current output struc-
ture These outputs can drive 50
X terminated
lines and reactive loads such as transformers ba-
luns and LC tank and filter circuits directly
Unlike low impedance follower buffers these out-
puts do not interact with the load to produce
ringing or instability If a high level low imped-
ance output is required the outputs can be recov-
ered differentially and converted to a single end-
ed output with a fast op amp such as the EL2075
(see Figure 19) The outputs can also drive cur-
rent input devices such as CMF amps current
conveyors and its own inputs directly by simple
connection
Figures 12 and 14 show the nulled gain and feed-
through characteristics of the IXY and IXY out-
puts which are virtually identical and differ only
in phase Figure 12 is with the AC signal applied
to the X input with Y used as the gain control
and in Figure 14 these signals are reversed Note
that in both cases the signal feedthrough rolls up
and peaks near the cutoff frequency This is quite
typical of the performance of all previous four
quadrant multipliers Figures 13 and 15 show the
corresponding gainfeedthrough characteristics
for the differentially recovered output signal
IXY-IXY Note that in this case the peak feed-
through at high frequencies is lower by more
than 40 dB
See EL2082 Data SheetReceiver IF Amplifier (Figure 19)
The EL2082 also has a current output
9
相關PDF資料 |
PDF描述 |
|---|---|
| EL4083CN | Current Mode Four Quadrant Multiplier |
| EL4083CS | Current Mode Four Quadrant Multiplier |
| EL4084CN | Precision Low Power FGA™ Voltage References; Temperature Range: -25°C to 85°C; Package: 3-SOT-23 T&R |
| EL4084CS | Precision Low Power FGA™ Voltage References; Temperature Range: -40°C to 85°C; Package: 3-SOT-23 T&R |
| EL4093CN | 300 MHz DC-Restored Video Amplifier |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EL4083CN | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Current Mode Four Quadrant Multiplier |
| EL4083CS | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Current Mode Four Quadrant Multiplier |
| EL4084CN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Multiplier |
| EL4084CS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Multiplier |
| EL4089 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:DC Restored Video Amplifier |
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