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AD4311-1 Fiches technique(PDF) 10 Page - Analog Devices

No de pièce AD4311-1
Description  Low Cost, Dual, High Current Output Line Driver with Shutdown
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD4311-1 Fiches technique(HTML) 10 Page - Analog Devices

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ADA4311-1
Rev. 0 | Page 10 of 16
THEORY OF OPERATION
The ADA4311-1 is a dual-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 21 shows a
simplified model of a current feedback amplifier. Because RIN is
proportional to 1/gm, the equivalent voltage gain is 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
OUT
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.
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 21. Simplified Block Diagram


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