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Agilent AN 1200-7

Simplified Analysis of Phase Locked Loop

Capture and Tracking Range

Application Note

Agilent Technologies 53310A

Modulation Domain Analyzer

Direct Analysis of Phase-Locked

Loops

Situation Freq

Phase-Locked Loops (PLLs) are com- uenc

y vs

mon yet essential circuits in many

View

t

profil he PLL's

Time

the p e as it is output

Prof

electronic applications. They may be oints ram frequ ile

e

and where t ped thro ncy

used as narrowband filters to recover reca h u

ptur e loop lo gh

es lo ses

Freq ck.

signals embedded in noise, or for syn- uenc

y

chronizing digital transmissions in Capt

communication applications. Other The u ure Ra

givin pper an nge

traditional uses include frequency gac d

lear lower ca

mea

sure pture fr

synthesizers, demodulators, multipli- of th equen

e ca

ptur cy points

ers, dividers, and many more. e ran

ge of of the P

the P LL are

LL. show

n

Problem

Trac

The analysis of PLLs is challenging. k

The u ing Ra

point pper an nge

Components can be assessed individ- d

are s s where lower fr

hown the P eque

ually, but closed loop characterization of th n

e tra . This giv LL loses cy

cking es lo

is often difficult to obtain. Both tran- rang a meas ck

e of u

the P re

sient and dynamic frequency response Capt LL.

u re Tr

are of interest to the designer. Fast Pote

tran ntially tr

ansie

nt

sient ouble Time

and direct analysis of parameters with

a qu s can be some ca

time ick a easil ptur

such as capture and tracking range base

.

djus

tmen y examin e

t of e

the d

are needed to improve characteriza-

tion and shorten design cycles.

Solution Related Applications By internet, phone, or fax, get assistance

The Agilent Technologies 53310A