HCF4046B(1989) Просмотр технического описания (PDF) - STMicroelectronics

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HCF4046B
(Rev.:1989)

MICROPOWER PHASE-LOCKED LOOP

STMicroelectronics 

HCC/HCF4046B

input over the full VCO frequency range. Moreover,

the power dissipation due to the low-pass filter is re-

duced 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

Figure a : Phase-Comparator I Characteristics at

Low-Pass Filter Output.

comparator is equal to the capture range, inde-

pendent 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. (c) shows

typical waveforms for a COS/MOS PLL employing

phase comparator II in a locked condition.

Figure b : Typical Waveforms for COS/MOS Phase

Locked-Loop Employing Phase Com-

parator I in Locked Condition of fo.

Figure C : Typical Waveforms For COS/MOS Phase-locked Loop Employing Phase Comparator II In

Locked Condition.

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