參數(shù)資料
型號(hào): ADA4311-1ARHZ-R7
廠商: Analog Devices Inc
文件頁(yè)數(shù): 2/16頁(yè)
文件大小: 0K
描述: IC LINE DRIVER DUAL HS 10-MSOP
標(biāo)準(zhǔn)包裝: 1
放大器類型: 電流反饋
電路數(shù): 2
轉(zhuǎn)換速率: 1050 V/µs
-3db帶寬: 310MHz
電流 - 輸入偏壓: 4.5µA
電壓 - 輸入偏移: 1000µV
電流 - 電源: 11.8mA
電壓 - 電源,單路/雙路(±): 6 V ~ 12 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 10-MSOP
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面: 768 (CN2011-ZH PDF)
其它名稱: ADA4311-1ARHZ-R7DKR
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
IN
OUT
R
G
s
T
s
T
G
V
+
×
+
×
=
where:
G
F
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
0
69
40
-018
Figure 21. Simplified Block Diagram
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