gm CFA V
參數(shù)資料
型號: LT1228CS8#PBF
廠商: Linear Technology
文件頁數(shù): 9/22頁
文件大?。?/td> 0K
描述: IC CURRNT FEEDBK AMP 100MHZ8SOIC
標(biāo)準(zhǔn)包裝: 100
放大器類型: 電流反饋
電路數(shù): 1
轉(zhuǎn)換速率: 3500 V/µs
-3db帶寬: 100MHz
電流 - 輸入偏壓: 10µA
電壓 - 輸入偏移: 3000µV
電流 - 電源: 6mA
電流 - 輸出 / 通道: 125mA
電壓 - 電源,單路/雙路(±): 4 V ~ 36 V,±2 V ~ 18 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SO
包裝: 管件
產(chǎn)品目錄頁面: 1318 (CN2011-ZH PDF)
LT1228
17
1228fd
TYPICAL APPLICATIONS
Filters
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
ISET
C
RF + 1
RG
R2
R2 + R2A
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
100A SET CURRENT
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 10A. This limits
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 100A
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.
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