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參數(shù)資料
| 型號： | SP5055S |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 99K |
| 代理商： | SP5055S |
AN168
5
ω
e
1-
ζ
2
ω
out
Example (Selection of
ω
O
and
ζ
)
Assume the reprogramming causes a frequency step of
512 MHz and we wish the VCO to settle to an accuracy of 5.12
Hz within 100 mS. If the phase margin is 70° then the values
for
ζ
and
ω
O
are:-
ζ
= tan
2 (1+tan
= tan 70° = 0.8
2
) 2 (1+tan
2
70°)
ω
n
= — Ln
= — Ln
ζ
ts
0.8 x 0.1
∴
ω
n
= 237 rads/sec = 37Hz
Design Formulae
Using the known values of
ω
o
and
ζ
we have :-
KdKo
PN
ω
o
2
ζ
ω
o
C
1
C
1
=
R
2
=
C
2
= C
1
/5
5.12
1-
0.8
2
512x10
6
Example (Selections of C
1
, C
2
and R
2
)
Suppose Kd = 150μA/2 μA/rad y, K
= 20 MHz/volt,
P = 8, N = 10,722 whilst
ω
O
= 440 rads/sec and
ζ
= 0.87.
150 x 10
-6
x 20 x 10
6
x 2
8 x 10722 x 440
2
x 2
2 x 0.87
440 x 180.6 x 10
-9
∴
C1 =
= 180.16nF
R2 =
= 21.9K
C2 = C
1
/5
= 36.12nF
ω
O
= 440 rads/sec = 70Hz.
2
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