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5966-4476E


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                                           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     



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