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HCF4046M013TR Datasheet(PDF) 3 Page - STMicroelectronics |
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HCF4046M013TR Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 12 page HCF4046B 3/12 p-type output driver is maintained ON for a time corresponding to the phase difference. Subsequently, the capacitor voltage of the low-pass filter connected to this phase comparator is adjusted until the signal and comparator inputs are equal in both phase and frequency. At this stable point both p- and n-type output drivers remain OFF and thus the phase comparator output becomes an open circuit and holds the voltage on the capacitor of the low-pass filter constant. Moreover the signal at the "phase pulses" output is a high level which can be used for indicating a locked condition. Thus, for phase comparator II, no phase difference exists between signal and comparator input over the full VCO frequency range. Moreover, the power dissipation due to the low-pass filter is reduced when this type of phase comparator is used because both the p- and n-type output drivers are OFF for most of the signal input cycle. It should be noted that the PLL lock range for this type of phase comparator is equal to the capture range, independent of the low-pass filter. With no signal present at the signal input, the VCO is adjusted to its lowest frequency for phase comparator II. Fig.3 shows typical waveforms for a CMOS PLL employing phase comparator II in a locked condition. Figure 1 : Phase-Comparator I Characteristics at Low-Pass Filter Output. Figure 2 : Typical Waveforms for CMOS Phase Locked-Loop Employing Phase Comparator I in Locked Condition of fo |
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