參數(shù)資料
型號(hào)： 935044180118
廠商： NXP SEMICONDUCTORS
元件分類： PLL合成/DDS/VCOs
英文描述： PHASE LOCKED LOOP, PDSO16
封裝： 3.90 MM, PLASTIC, SOT-109, SO-16
文件頁(yè)數(shù)： 20/40頁(yè)
文件大?。?/td> 240K
代理商： 935044180118
1999 Jan 11
27
Philips Semiconductors
Product specication
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 lters.
PHASE
COMPARATOR
Fig.30
FILTER TYPE
TRANSFER FUNCTION
EXPLANATION
PC1
a.
passive lter
without
damping
b.
passive lter
with damping
τ
1 = R3 × C2;
τ2 = R4 × C2;
τ3 = R4 × C3;
A = 105 = DC gain amplitude
c.
active lter
with damping
PC2
d.
passive lter
with damping
A = 105 = limit DC gain
τ
1 = R3' × C2;
τ
2 = R4 × C2;
τ
3 = R4 × C3;
R3' = Rb/17;
Rb = 25 to 250 k
e.
active lter
with damping
A = 105 = DC gain amplitude
F
j
ω
()
1
1j
ωτ
1
+
---------------------
=
K
PC1
V
CC
π
----------- Vr
=
F
j
ω
()
1j
ωτ
2
+
1j
ωτ
1
τ
2
+
()
+
----------------------------------------
=
F
j
ω
()
1j
ωτ
2
+
1A
j
ωτ
1
+
-----------------------------
=
1j
ωτ
2
+
j
ωτ
1
---------------------
≈
F
j
ω
()
1j
ωτ
2
+
1A
j
ωτ
1
+
-----------------------------
=
1j
ωτ
2
+
j
ωτ
1
---------------------
≈
K
PC2
5
4
π
------- Vr
=
F
j
ω
()
1j
ωτ
2
+
1A
j
ωτ
1
+
-----------------------------
=
1j
ωτ
2
+
j
ωτ
1
---------------------
≈
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