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                 LOW NOISE
             OSCILLATOR DESIGN
                  ROGER MUAT
                 and ART UPHAM




RF & Microwave
Measurement
Symposium
and
Exhibition   .




                   www.HPARCHIVE.com
   LOW NOISE OSCILLATOR DESIGN

 I. Spectral Purity
    A. What is spectral purity in oscillators?
    B. What determines spectral purity?


II. Low Noise Oscillator Design
    A. Establish objectives
    B. Select a resonator
       1. Measure: Qu, l/f noise, AM-FM conversion
       2. Analyze phase noise
    C. Select a circuit topology
    D. Select an active device
    E. Select matching networks
    F. Measure:
       1. Open loop gain/phase
       2. Closed loop gain/phase


III. Oscillator Computer Analysis
    A. Open loop
    B. Closed loop


IV. Other Noise Mechanisms
    A. Spurious modes
    B. Upconverted noise




                                                     3




                     www.HPARCHIVE.com
    _ _ _ _ Spectral Purity                                                                                                       _



                              LOW NOISE
                          OSCILLATOR DESIGN




            RF & Microwave
            Measurement
            Symposium
            and
            Exhibition




                                                                           961




         LOW NOISE OSCILLRTOR DESIGN
           SPECTRRL PURITY
            A. What is :;pectraJ purity in OSCillators?
            B. What determine:; spedral purityl
           LOYV NOISE OSCILLRrOR DESIGN
            A. EstabW:;h objectives
            B. Select a resonator
            C. SelM:! a Circuit topology
            O. Seled an active <:l.,yice
            E. Select malchill9 networK
            F. fAeasUte
           OSCILLRTOR COMPUTER RNRLYSIS
            A. Open loop
            B. Close<:lloop
           OTHER NOISE MECHRNISMS
            A. SpuriOUS modes
            B. Upconverted noise



                                                                           962


                                                                                  Spectral Purity describes the degree of degrada-
                                                                                  tion from a perfect impulse in the frequency
      SPECTRAL PURITY DEFINITIONS                                                 domain:
                                                                                                    Vet) = cos   W
                                                                                                                     o t
                      VO) = cos               Wo     t
                V(W}          =   o(f)]
                          I          I                  L----l
                         RM Noise                         PM NOise                Real signals have some noise associated
                   SSB NOiSe Powet in a                                                   Vet) = [1 + eA(t)] cos [wot + (t)]
                 1Hz Bw f m Hz hom Cattiet
         t.(fm)~    Total Si9nal Powet
                                                                                  We will focus primarily on phase noise (PM)
                        t.(fm)      = S(2$








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