HCF4046B

9/12

DESIGN INFORMATION This information is a guide for approximating the value of external components

in a Phase-Locked-Loop system. The selected external components must be within the following ranges:

5K

Ω ≤ R

For further information, see

(1) F. Gardner, "Phase-Lock Techniques" John Wiley and Sons, New York, 1966

(2) G.S. Mosckytz "miniaturized RC filters using phase Lockedloop" BSTJ May 1965

CHARACTERISTICS

USING PHASE COMPARATOR I

USING PHASE COMPARATOR II

VCO WITHOUT

OFFSET R2=

∞

VCO WITH

OFFSET

VCO WITHOUT

OFFSET R2=

∞

VCO WITH

OFFSET

VCO Frequency

For No Signal Input

VCO in PLL System will Adjust to Centre

VCO in PLL System will Adjust to Lowest

Frequency Lock Range,

Frequency Lock Range,

Loop filter Component

Section

Phase Angle Between

SIgnal and Comparator

Always 0° in lock

Locks on Harmonics of

Centre Frequency

Yes

No

Signal Input Nose Rejec-

tion

High

Low