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参数资料
型号： T9000
厂商： Lineage Power
英文描述： ISDN Network Termination Node (NTN) Device(ISDN网络终端节点器件)
中文描述： ISDN网络终端节点（新界西）设备（ISDN网网络终端节点器件）
文件页数： 98/126页
文件大小： 1523K
代理商： T9000
98
Lucent Technologies Inc.
Advance Data Sheet
April 2000
ISDN Network Termination Node (NTN) Device
T9000
12 PWM Module
(continued)
12.4 PWM Auto Mode Example
(continued)
In the physical circuit implementation, the width of the pulse follows a 2.5%—97.5% modulation scheme and
depends on the granularity and tick values as described in the following equation:
W(n) = FLOOR
x tick
(16)
Note that, in step 1 of the above procedure (equation 3), it is assumed that range and granularity have already
been chosen. It is useful to look at the effects of selecting different values for range and granularity in order to
guide the selection of these values for a particular application. Consider an example using real numbers.
Suppose it is desired to generate a sine wave of frequency Fs = 697 Hz. Table 103 shows the resulting values of
PWV, Ka, Fa, and frequency error (Ferr) for all possible values of range and granularity.
Table 103. PWM Sine Modulator Programming Example
One interesting result in Table 103 is that, for different combinations of granularity (G) and range (R) whose prod-
ucts are equal, the resulting parameters for the sine wave output in each case are identical. For example, the pairs
(G = 1, R = 256), (G = 2, R = 128), (G = 4, R = 64), and (G = 8, R = 32) all yield identical values of PWV, Ka, Fa,
and Ferr. However, note from equation 16 that larger values of granularity will produce more rounding error for a
given W(n).
Granularity
1
1
1
1
2
2
2
2
4
4
4
4
8
8
8
8
16
16
16
16
Range
32
64
128
256
32
64
128
256
32
64
128
256
32
64
128
256
32
64
128
256
PP (
μ
s)
2.08
4.17
8.33
16.67
4.17
8.33
16.67
33.33
8.33
16.67
33.33
66.67
16.67
33.33
66.67
133.33
33.33
66.67
133.33
266.67
Ks (Fs = 697)
688.666
344.333
172.166
86.083
344.333
172.166
86.083
43.042
172.166
86.083
43.042
21.521
86.083
43.042
21.521
10.760
43.042
21.521
10.760
5.380
PWV
95
190
381
761
190
381
761
1523
381
761
1523
3045
761
1523
3045
6090
1523
3045
6090
12181
Ka
Fa
Ferr (%)
0.17
0.17
0.09
0.04
0.17
0.09
0.04
0.02
0.09
0.04
0.02
0.01
0.04
0.02
0.01
0.01
0.02
0.01
0.01
0.00
689.85
344.93
172.01
86.12
344.93
172.01
86.12
43.03
172.01
86.12
43.03
21.52
86.12
43.03
21.52
10.76
43.03
21.52
10.76
5.38
695.80
695.80
697.63
696.72
695.80
697.63
696.72
697.17
697.63
696.72
697.17
696.95
696.72
697.17
696.95
696.95
697.17
696.95
696.95
697.00
ROUND 128
1
0.95
+
2
π
n
PWV
2
16
×
×
sin
×
×
Granularity
----------------------------------------------------------------------------------------------------------------------------------------
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