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參數(shù)資料
| 型號： | LT1228IS8#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 401K |
| 代理商： | LT1228IS8#TR |
17
LT1228
1228fc
Using the variable transconductance of the LT1228 to
make variable filters is easy and predictable. The most
straight forward way is to make an integrator by putting a
capacitor at the output of the transconductance amp and
buffering it with the current feedback amplifier. Because
the input bias current of the current feedback amplifier
must be supplied by the transconductance amplifier, the
set current should not be operated below 10
A.Thislimits
the filters to about a 100:1 tuning range.
The Single Pole circuit realizes a single pole filter with a
corner frequency (fC) proportional to the set current. The
values shown give a 100kHz corner frequency for 100
A
set current. The circuit has two inputs, a lowpass filter
input and a highpass filter input. To make a lowpass filter,
ground the highpass input and drive the lowpass input.
Conversely for a highpass filter, ground the lowpass input
and drive the highpass input. If both inputs are driven, the
result is an allpass filter or phase shifter. The allpass has
flat amplitude response and 0
° phase shift at low frequen-
cies, going to –180
° at high frequencies. The allpass filter
has –90
° phase shift at the corner frequency.
TYPICAL APPLICATIO S
U
Filters
Single Pole Low/High/Allpass Filter
Allpass Filter Phase Response
FREQUENCY (Hz)
10k
PHASE
SHIFT
(DEGREES)
–90
–45
0
100k
1M
10M
LT1228 TA17
–135
–180
1mA SET CURRENT
100
A SET CURRENT
LT1228 TA16
–
+
–
+
gm
CFA
VOUT
8
3
2
RF
1k
R2
120
5
1
6
R3
120
C
330pF
fC =
×
R3A
1k
ISET
RG
1k
R2A
1k
VIN
LOWPASS
INPUT
VIN
HIGHPASS
INPUT
fC = 109 ISET FOR THE VALUES SHOWN
10
2
π
ISET
C
RF + 1
RG
R2
R2 + R2A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1228MJ8#PBF | 1 CHANNEL, VIDEO AMPLIFIER, CDIP8 |
| LT1228MJ8#TRPBF | 1 CHANNEL, VIDEO AMPLIFIER, CDIP8 |
| LT1228MJ8#TR | 1 CHANNEL, VIDEO AMPLIFIER, CDIP8 |
| LT1304CS8-3.3#PBF | 1.2 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT1304CS8-3.3#TRPBF | 1.2 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1228M | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228MJ8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1229 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual and Quad 100MHz Current Feedback Amplifiers |
| LT1229C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual and Quad 100MHz Current Feedback Amplifiers |
| LT1229CJ8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual and Quad 100MHz Current Feedback Amplifiers |
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