HP Scherer Low PN Signal Generation free download

File name Scherer_Low_PN_Signal_Generation.pdf

P$ffiTI$ CIE{}RfrE o of Generation Low PhaseNoise MicrowaveSignals DieterScherer September1981 o Rt& Microwave Measurement Symposium ancl Exhibition o ftE H"=EIITJ 1. Why are Low PhaseNoise Microwave Signalsneeded? Example Effectof LocalOscillator 1: PhaseNoiseon ReceiverSelectivityin Multi Signal Environment ReceiverLO Downconverted Interfering Interfering Signal Signal Down- Converted Wanted Signal Wanted Signal Receiver lF Bandwidth The receiver tries to see a weak wanted signal in the presence of a stmng interfering signal. The downconversion processtransfers the noise sidebandsofthe receiver LO to both the wanted and interfering IF signal. Sideband noise of the interfering IF signal falling into the IF bandwidth submerges the wanted IF signal. Example2=Etlect of CarrierPhaseNoisein a o DopplerRadarSystem @v -- Moving /-r Object 9blect (Stationaryfor \\\r^, | Simplicity) ,rfP--. \1_. fv ;\ '\-7-. _- \1 \r V.fn fD : 2'E; - rltlr-.a-\ Glutter Signal fD : DoPPler shift v : Speed of moving object co : SPeedof light fo : Carrier frequencY Stationary Object o Signal Transmitter Clutter