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参数资料
| 型号： | MF10AJ |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | Universal Monolithic Dual Switched Capacitor Filter |
| 中文描述： | DUAL SWITCHED CAPACITOR FILTER, RESISTOR PROGRAMMABLE, UNIVERSAL, CDIP20 |
| 封装： | 0.300 INCH, CERAMIC, DIP-20 |
| 文件页数： | 10/20页 |
| 文件大小： | 405K |
| 代理商： | MF10AJ |
2.0 Modes of Operation
(Continued)
MODE 2: Notch 2, Bandpass, Lowpass: f
notch
k
f
O
(SeeFigure 9 )
e
center frequency
e
f
CLK
R4
f
O
100
R2
a
1 orf
CLK
50
R2
R4
a
1
f
notch
e
f
CLK
100
orf
CLK
50
Q
e
quality factor of the complex pole pair
e
0
R2/R4
a
1
R2/R3
H
OLP
e
Lowpass output gain (as f
x
0)
R2/R1
R2/R4
a
1
H
OBP
e
Bandpass output gain (at f
e
f
O
)
e b
R3/R1
H
ON1
e
Notch output gain (as f
x
0)
R2/R1
R2/R4
a
1
e b
e b
H
ON2
e
Notch output gain
#
as f
x
f
CLK
Filter dynamics: H
OBP
e
Q
0
H
OLP
H
ON2
e
0
H
ON1
H
ON2
2
J
e b
R2/R1
MODE 3: Highpass, Bandpass, Lowpass Outputs
(SeeFigure 10 )
e
0
R4
R2
H
OLP
e
Lowpass Gain
#
as f
x
0
J
f
O
e
f
CLK
100
e
quality factor of the complex pole pair
R2
c
R3
c
0
R2
R4orf
CLK
50
c
0
R2
2
J
R4
Q
H
OBP
e
Lowpass Gain
#
at f
e
f
O
J
H
OHP
e
Highpass Gain
as f
x
f
CLK
e b
R2
R1
e b
R3
R1
e b
R4
R1
Circuit dynamics:R4
H
OBP
e
H
OHP
c
H
OLP
c
Q
e
H
OHP
H
OLP
;
H
OLP(peak)
j
Q
c
H
OLP
(for high Q’s)
H
OHP(peak)
j
Q
c
H
OHP
(for high Q’s)
TL/H/10399–18
FIGURE 9. MODE 2
TL/H/10399–19
*
In Mode 3, the feedback loop is closed around the input summing amplifier; the finite GBW product of this op amp causes a slight Q enhancement. If this is a
problem, connect a small capacitor (10 pF
b
100 pF) across R4 to provide some phase lead.
FIGURE 10. MODE 3
10
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