参数资料
型号: TLC2932IPWG4
厂商: TEXAS INSTRUMENTS INC
元件分类: XO, clock
英文描述: PHASE LOCKED LOOP, 40 MHz, PDSO14
封装: PLASTIC, TSSOP-14
文件页数: 10/28页
文件大小: 665K
代理商: TLC2932IPWG4
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
F2(s)
F1(s) +
Kp
@ KV
N
@ (T1 ) T2)
1
) s
@ T2
s2
) s 1 )
Kp
@KV @T2
N
@(T1)T2)
)
Kp
@K
V
N
@(T1)T2)
(1)
and the transfer function for frequency is
F
OUT(s)
F
REF(s)
+
Kp
@ KV
(T1
) T2)
1
) s
@ T2
s2
) s
@ 1 )
Kp
@K
V
@T2
N
@(T1)T2)
)
Kp
@KV
N
@(T1)T2)
(2)
The standard two-pole denominator is D = s2 + 2
ζ ωn s + ωn2 and comparing the coefficients of the denominator
of equation 1 and 2 with the standard two-pole denominator gives the following results.
wn +
Kp
@ KV
N
@ (T1 ) T2)
Solving for T1 + T2
T1
) T2 +
Kp
@ KV
N
@ w 2
n
(3)
and by using this value for T1 + T2 in equation 3 the damping factor is
z +
wn
2 @
T2
)
N
Kp
@ K
V
solving for T2
T2
+
2
z
w –
N
Kp
@ K
V
then by substituting for T2 in equation 3
T1
+
K
V
@ Kp
N
@ w 2
n
2
z
w
n
)
N
Kp
@ K
V
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