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ADA4310-1ARHZ-R7 Datasheet(PDF) 10 Page - Analog Devices

Part # ADA4310-1ARHZ-R7
Description  Low Cost, Dual, High Current Output Line Driver with Shutdown
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADA4310-1ARHZ-R7 Datasheet(HTML) 10 Page - Analog Devices

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ADA4310-1
Rev. 0 | Page 10 of 16
THEORY OF OPERATION
The ADA4310-1 is a current feedback amplifier with high
output current capability. With a current feedback amplifier, the
current into the inverting input is the feedback signal, and the
open-loop behavior is that of a transimpedance, dVO/dIIN or TZ.
The open-loop transimpedance is analogous to the open-loop
voltage gain of a voltage feedback amplifier. Figure 20 shows a
simplified model of a current feedback amplifier. Because RIN is
proportional to 1/gm, the equivalent voltage gain is just TZ × gm,
where gm is the transconductance of the input stage. Basic
analysis of the follower with gain circuit yields
()
()
F
IN
Z
Z
IN
O
R
R
G
s
T
s
T
G
V
V
+
×
+
×
=
where:
G
F
R
R
G
+
= 1
Ω
50
1 ≈
=
m
IN
g
R
Because G × RIN << RF for low gains, a current feedback
amplifier has relatively constant bandwidth vs. gain, the 3 dB
point being set when |TZ| = RF.
Of course, for a real amplifier there are additional poles that
contribute excess phase, and there is a value for RF below which
the amplifier is unstable. Tolerance for peaking and desired
flatness determines the optimum RF in each application.
RF
VOUT
RG
RN
VIN
RIN
IIN
TZ
Figure 20. Simplified Block Diagram


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