參數(shù)資料
型號(hào)： LV25450PNW
元件分類(lèi)： 調(diào)諧器
英文描述： AUDIO TUNER, PQFP64
封裝： 10 X 10 MM, SQFP-64
文件頁(yè)數(shù)： 31/40頁(yè)
文件大小： 1251K
代理商： LV25450PNW
LV25450PNW
Phase Comparator and Charge Pump Circuits
(1) Phase comparator and charge pump operation
In the PLL circuit block shown in figure 1, the phase comparator compares the phases of the reference frequency (fr)
and the comparison frequency (fp), and outputs the amount of the phase difference from the charge pump.
Figure 1 PLL Circuit Block
Reference Divider
Programmable Divider
Phase
Detector
Charge
Pump
LPF
VCO
Mixer
Leakage during
strong-field input
RF
fr
fp
Figure 2 shows the phase comparator/charge pump output characteristics. The phase comparator outputs a voltage V
φ
that is proportional to the phase difference
φ between fr and fp. The phase comparator's characteristics can be
switched by changing the phase comparator dead zone mode setting. The phase comparator can be set to modes (DZA,
DZB) in which both the charge pump p-channel and n-channel sides are turned on when the phase difference is small,
or can be set to a mode (DZD) that does not output the phase difference when the phase difference is small.
Figure 2 Phase Comparator/Charge Pump Characteristics
φ err[ns]
V
φ[V]
V
φ[V]
V
φ[V]
V
φ[V]
Dead Zone(--)
DZA
mode
DZB
mode
DZC
mode
DZD
mode
φ err[ns]
Dead Zone(-)
Dead Zone
≈ 0
Dead Zone(+)
fp > fr
fr > fp
No.A1668-37/40
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