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參數(shù)資料
| 型號： | MC2800 |
| 廠商： | Motorola, Inc. |
| 英文描述： | FSK FM IF Receiver(FSK FM IF 接收器) |
| 中文描述： | FSK信號調(diào)頻（FSK信號調(diào)頻中頻接收器中頻接收機(jī)） |
| 文件頁數(shù)： | 23/28頁 |
| 文件大小： | 473K |
| 代理商： | MC2800 |
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MC2800
23
MOTOROLA RF/IF DEVICE DATA
Low Pass Bit–Rate Filter
This section is a short description of the Architecture of the
Bit–Rate Filter used in the MC2800.
C2
2R
2R
R
Ao
+
Vo
+
Vi
C1
8
7
5
6
Figure 19.
Based on the schematics described above, the equation
of this filter is:
vo
vi
(S)
2Ao
1 Ao
s4RC1
1
s2RC2
2
1 Ao
1
s22R2C1C2
2Ao
3 A0
1
s
p1
1
s
p2
Assume Ao = 200, and C1 = 10C2, this equation can be
simplified as:
0.44
RC2
p1
and
p2
11.56
RC2
With the different combinations of R1, R2 to setup the
Bit–Rate Filter, the cut–off frequencies has been defined
according to the table below:
Table 4. Bit–Rate Filter Frequency Responses
(assume C1 = 10C2 = 22 nF)
R1
R2
R/k
fp1/Hz
379
fp2/Hz
9.96 k
0
0
84.0
1
0
35.6
894
23.5 k
1
1
26.5
1.20 k
31.6 k
0
1
12.8
2.49 k
65.3 k
A typical frequency response of the bit–rate filter is shown
in Figure 20.
Figure 20. Gain Response
of the Bit–Rate Filter
6.0
10
G
f, FREQUENCY (Hz)
Ao = 200
R1 = 0, R2 = 1
R = 12.8 k
C2 = 2.2 nF
100
1000
10000
4.0
2.0
0
–2.0
–4.0
–6.0
–8.0
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