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| 型號(hào)： | TLC2933PWLE |
| 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) |
| 文件頁數(shù)： | 14/21頁 |
| 文件大?。?/td> | 367K |
| 代理商： | TLC2933PWLE |
TLC2933
HIGH-PERFORMANCE PHASE-LOCKED LOOP
SLAS136A – APRIL 1996 – REVISED JUNE 1997
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
low-pass-filter (LPF) configurations
Many excellent references are available that include detailed design information about LPFs and should be
consulted for additional information. Lag-lead filters or active filters are often used. Examples of LPFs are shown
in Figure 17. When the active filter of Figure 17(c) is used, the reference should be applied to FIN-B because
of the amplifier inversion. Also, in practical filter implementations, C2 is used as additional filtering at the VCO
input. The value of C2 should be equal to or less than one tenth the value of C1.
R1
C1
T1 = C1R1
(a) LAG FILTER
R1
C1
T1 = C1R1
T2 = C1R2
R2
(b) LAG-LEAD FILTER
R2
C1
R1
T1 = C1R1
T2 = C1R2
(c) ACTIVE FILTER
A
–
VI
VO
VI
VO
VI
C2
VO
C2
Figure 17. LPF Examples for PLL
the passive filter
The transfer function for the low-pass filter shown in Figure 17(b) is;
VO
VIN
1
s
(T1
T2
1
s
T2)
where
T1
R1
C1 and T2
R2
C1
(2)
Using this filter makes the closed-loop PLL system a type 1 second-order system. The response curves of this
system to a unit step are shown in Figure 18.
the active filter
When using the active filter shown in Figure 17(c), the phase detector inputs must be reversed since the filter
adds an additional inversion. Therefore, the input reference frequency should be applied to the FIN-B terminal
and the output of the VCO divider should be applied to the input reference terminal, FIN-A.
The transfer function for the active filter shown in Figure 17(c) is:
F(s)
1
s
R2
C1
s
R1
C1
(3)
Using this filter makes the closed-loop PLL system a type 2 second-order system. The response curves of this
system to a unit step are shown in Figure 19.
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