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参数资料
| 型号： | CXA3266Q |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PHASE LOCKED LOOP, 0.12 MHz, PQFP48 |
| 封装： | PLASTIC, QFP-48 |
| 文件页数： | 30/62页 |
| 文件大小： | 929K |
| 代理商： | CXA3266Q |
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CXA3266Q
- 36 -
Charge Pump and Loop Filter Settings
The CXA3266Q's charge pump is a constant-current output type as shown below.
The PLL closed loop transmittance is obtained by the following formula.
(
θo/N)/θr = (KPD F (S) KVCO 1/N 1/S)/(1 + KPD F (S) KVCO 1/N 1/S) ... (1)
Here, KPD, F (S), and KVCO are ;
*1
The reason for the 1/S inside the phase detector is as follows.
θo (t)/N =
0
(t)/Ndt +
θo (t = 0)/N... (a)
If
θo (t = 0) = 0,
θo (t)/N =
0
(t)/Ndt... (b)
Performing Laplace conversion ;
θo (S)/N = 1/s W0 (S)/N... (c)
When a constant-current output charge pump circuit is used inside the PLL, the
phase detector output acts as a current source, and the dimension of its
transmittance KPD is A/rad. Also, when considering the VCO input as a voltage,
the LPF transmittance dimension must be expressed in ohms (
= V/A).
Therefore, the PLL transmittance when a constant-current output charge pump
circuit is used is as follows.
KPD
: Phase comparator gain
(A/rad)
F (S)
: Loop filter transmittance
(
)
KVCO
: VCO gain
(rad/sV)
S1
S2
To LPF
VCC
1/S
KPD
(A/rad)
F (S)
()
KVCO
(rad/sV)
1/S
1/N
PD
LPF
VCO
counter
o
N
0
0/N
r
+
–
ω
θ
ω
o
t
∫
ω
o
t
∫
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