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參數(shù)資料
| 型號： | OM4031T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 數(shù)字信號處理外設 |
| 英文描述： | Digital post-detection filter for FSK data receivers |
| 中文描述： | 1-BIT, DSP-DIGITAL FILTER, PDSO8 |
| 封裝： | 3.90 MM, PLASTIC, SOT-96-1, SOP-8 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 68K |
| 代理商： | OM4031T |
October 1994
5
Philips Semiconductors
Preliminary specification
Digital post-detection filter
for FSK data receivers
OM4031T
Filter characteristic
The frequency characteristic of the moving average filter in
the OM4031T is given in Fig.3 for N = 12 and N = 6.
The horizontal axis shows the normalized frequency f
N
which is the ratio of the frequency f and the sampling
frequency f
s
. The value for f
s
is given in Table 1 for the
various data rates and filter bandwidths.
The vertical axis shows the normalized amplitude A
N
.
At normal bandwidth the oversampling rate is 16, except
for 4800 bits/s where it is 8. At double bandwidth the
oversampling rate is 32, except for 2400 bits/s,
where it is 16.
The 3 dB cut-off frequency is calculated as follows:
N = 12:
N = 6:
f
co
f
co
0.0371
f
s
f
s
×
=
0.0748
×
=
Fig.3 Filter transfer function of the OM4031T.
handbook, full pagewidth
0.5
0
0
0.1
0.2
0.3
0.4
MLC275
0.2
0.4
0.6
0.8
fN
AN
(1)
(2)
(1) N = 12.
(2) N = 6.
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