參數(shù)資料
型號(hào): TLC2932PW
廠商: Texas Instruments, Inc.
英文描述: HIGH-PERFORMANCE PHASE-LOCKED LOOP
中文描述: 高性能鎖相環(huán)
文件頁(yè)數(shù): 18/24頁(yè)
文件大?。?/td> 418K
代理商: TLC2932PW
TLC2932
HIGH-PERFORMANCE PHASE-LOCKED LOOP
SLAS097E – SEPTEMBER 1994 – REVISED MAY 1997
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Using the low-pass filter in Figure 25(b) and divider ratio N, the transfer function for phase and frequency are
shown in equations 1 and 2. Note that the transfer function for phase differs from the transfer function for
frequency by only the divider value N. The difference arises from the fact that the feedback for phase is unity
while the feedback for frequency is 1/N.
Hence, transfer function of Figure 24 (a) for phase is
2(s)
1(s)
Kp
KV
N
(T1
T2)
1
s
T2
T2
T2)
s2
s
1
KpKV
N (T1
KpKV
N (T1
T2)
(1)
and the transfer function for frequency is
FOUT(s)
FREF(s)
Kp
(T1
KV
T2)
1
s
T2
T2
T2)
s2
s
1
KpKV
N (T1
KpKV
N (T1
T2)
(2)
The standard two-pole denominator is D = s
2
+ 2
ζ ω
n
s +
ω
n2
and comparing the coefficients of the denominator
of equation 1 and 2 with the standard two-pole denominator gives the following results.
n
Kp
KV
N
(T1
T2)
Solving for T1 + T2
T1
T2
Kp
N
KV
2
n
(3)
and by using this value for T1 + T2 in equation 3 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 3
KV
N
T1
Kp
2
n
–2
n
N
Kp
KV
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