參數(shù)資料
型號: AD8396ACPZ-RL
廠商: Analog Devices Inc
文件頁數(shù): 11/12頁
文件大?。?/td> 0K
描述: IC LINE DRVR ADSL/ADSL2 16LFCSP
產(chǎn)品變化通告: AD8396 Package Change 11/Sept/2009
AD8396 Discontinuation 17/Apr/2012
標(biāo)準(zhǔn)包裝: 5,000
類型: 線路驅(qū)動器,發(fā)射器
驅(qū)動器/接收器數(shù): 2/0
電源電壓: 6 V ~ 24 V
安裝類型: 表面貼裝
封裝/外殼: 16-WQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 16-LFCSP-WQ(4x4)
包裝: 帶卷 (TR)
AD8396
Rev. C | Page 8 of 12
THEORY OF OPERATION
The AD8396 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 13 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 the gain circuit yields
F
)
(
(S)
R
G
T
G
V
IN
Z
IN
O
+
×
+
×
=
where:
G
= 1 + RF/RG
RIN
= 1/gm ≈ 50 Ω
Because G × RIN << RF for low gains, a current feedback amplifier
has relatively constant bandwidth vs. gain. The 3 dB point is set
when |TZ| = RF.
In a nonideal 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
RG
VOUT
RIN
IIN
TZ
RN
VIN
0
7
022
-01
3
Figure 13. Simplified Block Diagram
OBSOLETE
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