參數(shù)資料
型號: HCT9046
廠商: NXP Semiconductors N.V.
英文描述: PLL with bandgap controlled VCO
中文描述: 鎖相環(huán)控制VCO的帶隙
文件頁數(shù): 27/40頁
文件大?。?/td> 240K
代理商: HCT9046
1999 Jan 11
27
Philips Semiconductors
Product specification
PLL with bandgap controlled VCO
74HCT9046A
Filter design considerations for PC1 and PC2 of the HCT9046A
Figure 30 shows some examples of passive and active filters to be used with the phase comparators of the HCT9046A.
Transfer functions of phase comparators and filters are given in Table 4.
Table 4
Transfer functions of phase comparators and filters.
PHASE
COMPARATOR
Fig.30
FILTER TYPE
TRANSFER FUNCTION
EXPLANATION
PC1
a.
passive filter
without
damping
passive filter
with damping
b.
τ
1
= R3
×
C2;
τ
2
= R4
×
C2;
τ
3
= R4
×
C3;
A = 10
5
= DC gain amplitude
c.
active filter
with damping
PC2
d.
passive filter
with damping
A = 10
5
= limit DC gain
τ
1
= R3'
×
C2;
τ
2
= R4
×
C2;
τ
3
= R4
×
C3;
R3' = R
b
/17;
R
b
= 25 to 250 k
e.
active filter
with damping
A = 10
5
= DC gain amplitude
F
j
ω
(
)
j
ωτ
1
1
+
--------1
=
K
PC1
V
----------V r
=
F
j
ω
(
)
1
j
ω τ
1
ωτ
2
(
1
τ
2
+
)
+
------------------j
=
F
j
ω
(
)
1
j
ωτ
ωτ
1
+
1 A
=
1
--------------------
j
ωτ
2
j
ωτ
1
F
j
ω
(
)
1
j
ωτ
j
ωτ
1
+
1 A
----------------------------
=
1
--------------------
j
ωτ
2
j
ωτ
1
K
PC2
4
π
5
=
F
j
ω
(
)
1
j
ωτ
j
ωτ
1
+
1 A
----------------------------
=
1
--------------------
j
ωτ
2
j
ωτ
1
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