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參數(shù)資料
| 型號： | TLC2943DB |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH-PERFORMANCE DUAL PHASE-LOCKED BUILDING BLOCK |
| 中文描述： | 高效能雙鎖相環(huán)積木 |
| 文件頁數(shù)： | 21/27頁 |
| 文件大小： | 425K |
| 代理商： | TLC2943DB |
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TLC2943
HIGH-PERFORMANCE DUAL PHASE-LOCKED BUILDING BLOCK
SLAS249 – NOVEMBER 1999
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Using the lag-lead filter in Figure 19(b) and divider N value, the transfer function for phase and frequency are
shown in equations 4 and 5. Note that the transfer function for phase differs from the transfer function for
frequency by only the divider N value. The difference arises from the fact that the feedback for phase is unity,
while the feedback for frequency is 1/N.
Hence, the transfer function of Figure 19(a) for phase is
2(s)
1(s)
Kp
KV
N
(T1
T2)
1
s
T2
T2
T2)
s2
s
1
Kp
N
KV
(T1
Kp
KV
N
(T1
T2)
(4)
and the transfer function for frequency is
FOUT(s)
FREF(s)
Kp
(T1
KV
T2)
1
s
T2
T2
T2)
s2
s
1
Kp
N
KV
(T1
Kp
KV
N
(T1
T2)
(5)
The standard 2-pole denominator is D = s
2
+ 2
ζ ω
n
s +
ω
n2
and comparing the coefficients of the denominator
of equation (4) and (5) with the standard 2-pole denominator gives the following results.
n
Kp
KV
N
(T1
T2)
Solving for T1 + T2
T1
T2
Kp
N
KV
2
n
(6)
and by using this value for T1 + T2 in equation (6) the damping factor is
n
2
T2
N
Kp
KV
solving for T2
T2
2
–
N
Kp
KV
then by substituting for T2 in equation (6)
KV
N
T1
Kp
2
n
–2
n
N
Kp
KV
(7)
(8)
(9)
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