參數(shù)資料
型號(hào)： CXA3266Q
元件分類(lèi)： PLL合成/DDS/VCOs
英文描述： PHASE LOCKED LOOP, 0.12 MHz, PQFP48
封裝： PLASTIC, QFP-48
文件頁(yè)數(shù)： 32/62頁(yè)
文件大?。?/td> 929K
代理商： CXA3266Q
CXA3266Q
- 38 -
Here,
ωn and ζ are as follows.
ωn characteristic angular frequency :
The oscillatory angular frequency when PLL oscillation is assumed to have been maintained by the loop filter
and individual loop gains is called the characteristic angular frequency :
ωn.
ζ damping factor :
This is the PLL transient response characteristic, and serves as a measure of the PLL stability. It is
determined by the loop gain and the loop filter.
A capacitor C2 is added to the actual loop filter.
This added capacitor C2 is used to reduce the R noise, and a value of around 1/10 to 1/1000 of C1 should be
selected as necessary.
Current input type active filter with added capacitor C2
The filter transmittance is as follows.
The Bode diagram for formula (7) is as follows.
F (S) = (1 + C1 R S)/(S ((C1 + C2) + C1 C2 R S))
= (1 +
τ1 S)/(S (C1 + C2) (1 + τ2 S)) ............ (7)
τ1 = C1 R
τ2 = (C1 C2 R)/(C1 + C2)
Here, assuming C2 = C1/100, then ;
τ2 = (C1 C1/100 R)/(C1 + C1/100)
= 1/101 C1 R
= 1/101
τ1
Vo
C2
C1
R
ii
–Vo
–1
–A
1
τ1
log w
–45deg
0
–90
phase
[deg]
log
scale
gain
[dB]
1
τ2
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