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參數(shù)資料
| 型號： | ML2111 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Universal Dual High Frequency Filter(通用雙通道高頻濾波器) |
| 中文描述： | 通用雙高頻濾波器（通用雙通道高頻濾波器） |
| 文件頁數(shù)： | 14/26頁 |
| 文件大小： | 440K |
| 代理商： | ML2111 |
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ML2111
14
4.
Notch function:
available at N/AP/HP
A
and N/AP/HP
B
for several modes of operation.
s
ON
=
+
( )
H
s
s
Q
n
+
+
2
2
2
2
0
0
2
w
w
w
4
9
(4)
H
ON2
= Gain of the notch output for f
f
CLK
/2.
H
ON1
= Gain of the HP output for f
0
f
n
=
w
n
/2
p
. The frequency of the notch occurrence is
f
n
.
5.
Allpass function:
available at N/AP/HP
A
and N/AP/
HP
B
for modes 4 and 4a.
s
Q
s
Q
( )
H
s
s
OAP
=
-
+
+
+
2
0
0
2
2
0
0
2
w
w
w
w
(5)
H
OAP
= Gain of the allpass output for 0 < f < f
CLK
/2
For allpass functions, the center frequency and the Q of
the numerator complex zero pair is the same as the
denominator. Under these conditions the magnitude
response is a straight line. In mode 5, the center
frequency f
Z
of the numerator complex zero pair is
different than f
0
. For high numerator Q's, the
magnitude response will have a notch at f
Z
.
FILTER FUNCTION DEFINITIONS
+
LP
V+
S
A/B
6
15
1 (20)
R3
R2
4 (17)
V
IN
+
Σ
BP1
2 (19)
S1
A
5 (16)
BP2
3 (18)
+
+
Σ
BP
2 (19)
LP
V
IN
S1
A
5 (16)
V+
R1
S
A/B
6
15
N
3 (18)
1 (20)
R3
R2
4 (17)
ML2111
ML2111
Figure 15. Mode 1: 2nd Order Filter Providing Notch,
Bandpass, Lowpass
Figure 16. Mode 1a: 2nd Order Filter Providing
Bandpass, Lowpass
f
f
f
f H
;
R2
R
H
R3
R
CLK
(
n
OLP
OBP
0
100 50
1
1
=
=
= -
= -
);
;
;
H
R2
R
Q
R3
R2
ON1
1
= -
=
;
f
f
Q
R3
R2
H
R3
R2
CLK
(
OBP
0
1
100 50
=
=
= -
);
;
;
H
non
(
inverting H
OBP
OLP
2
1
1
=
-
= -
);
OPERATION MODES
There are three basic modes of operation — Modes 1, 2,
and 3 , each of which has derivatives; and four secondary
modes of operation — Modes 4, 5, 6, and 7, each of
which also has derivatives.
In Figure 15, the input amplifier is outside the resonant
loop. Because of this, mode 1 and its derivatives (modes
1a, 1b, 1c, and 1d) are faster than modes 2 and 3.
Mode 1 provides a clock tunable notch. It is a practical
configuration for second order clock tunable bandpass/
notch filters. In mode 1, a band pass output with a very
high Q, together with unity gain can be obtained with the
dynamics of the remaining notch and lowpass outputs.
Mode 1a (Figure 16) represents the simplest hookup of the
ML2111. It is useful when voltage gain at the bandpass
output is required. However, the bandpass voltage gain is
equal to the value of Q, and second order, clock tunable,
BP resonator can be achieved with only 2 resistors. The
filter center frequency directly depends on the external
clock frequency. Mode 1a is not practical for high order
filters as it requires several clock frequencies to tune the
overall filter response.
Modes 1b and 1c, Figures 17 and 18, are similar. They
both produce a notch with a frequency which is always
equal to the filter center frequency. The notch and the
center frequency can be adjusted with an external resistor
ratio.
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