Text preview for : 5966-4476E.pdf part of HP 5966-4476E HP Publikacje 5966-4476E.pdf
Back to : 5966-4476E.pdf | Home
Agilent AN 1200-3
VCO Step Response Analysis Made Easy
Application Note
Agilent Technologies 53310A
Modulation Domain Analyzer
Complete VCO Step Response
Analysis in a Single Pass
Situation Freq
uenc
Voltage Controlled Oscillators (VCOs) V y vs.
outp iew all t Time
are at the heart of many electronic ut fr h
eque e key are Prof
systems such as phase-locked loops,
ncy r as o
input esponse f a VCO's
ile
volta to a
ge. step
radar, and communication systems. p ed
The overall performance of these sys- Over
tems is often limited by the VCO's At t
s hoot
h
analy e push o
performance. Optimizing system per- of th sis f f
eatu a butto
and e maxim res allo n the H
formance requires a complete under- Freq
uenc
rate
of fr
um,
p
w ra
p
P 53
3
y eque eak-to-p id chara 10A's
standing of the VCO's characteristics. ncy r e
ingin ak,
cter
izatio
g. n
Problem
Most applications require that the Post
VCO operate at one frequency, then -Tun
Sett Resid
ing
Drift
ling T
be quickly switched to another fre- Q uick ime as s ual FM
for t ly deter h a
tunin ort-term s well
he V mine
quency where it will stay for some given CO t the sho g drift post
-
by us frequen o settle time is wn. Lon are clea
c t als g-t rly
time. The key VCO parameters here mark ing the y tolera o a quick o availa erm drif
ers a frequ nce adju ble wit t
68.7 s lim en the t
are frequency overshoot, settling 8 s it lin cy ime b stment h a
es. ase. of
time, and post-tuning drift.
Depending on how often a VCO is
switched, these parameters will
change. Thus, to properly character-
ize a VCO, it must be tested in the Time
same manner it will be used.
Conventional test techniques are
cumbersome and temperature sensi-
tive, require repetitive signals or lack
sufficient measurement resolution in
single-shot modes.
Solution Related Applications By internet, phone, or fax, get assistance
An easy-to-use, single-pass technique