CD4046构成的高稳定性调频电路

:1007-1857(2002)04-0006-04CD4046构成的高稳定性调频电路尹丽菊,陈　平,董传岱(山东理工大学,山东淄博255091):介绍了芯片CD4046的特点、工作原理以及由其构成的调频电路.:调频电路;稳定性;锁相环;压控振荡器:TN761.2:A:2002-09-11:(1972-),,,,.HighStabilityFrequencyModulationCircuitComposedofCD4046YINLi-ju,CHENPing,DONGChuan-dai(ShandongUniversityofTechnology,Zibo255091,China)Abstract:Thepaperhasintroducedtheproperties,principleofoperationofCD4046andthefrequencymodulationcircuit.Keywords:frequencymodulationcircuit;stability;PLL;VCO,,:,.1,.,,..,,..Q,.,.22.1,1.164200212JournalofShandongInstituteofTechnologyVol.16.No.4Dec.,20021Fig.1PLLblock-diagram,uiuoe.,.,.2.2V(t)vc(t),-,2.,,Vvc(t),V(t)=0+KvVc(t)0,vc(t)=0;Kv,,rad/sv.2Fig.2VCOcharacteristiccurve33.1CD4046CD4046,CMOS.(VCO)(PC1PC2),,..,4046(PLL).,.3,,4.3.25.N,108.,R1R2CT.R1CT.R2.:,,P3,.1,VCO.,P3,P1P2,.,15P4N3P5N2,P2I2CT,15,12P4N3P5N2.,CTI2,0.5.P1P2,R1R2I1,I2,.74:CD404634046Fig.34046fulldiagram44046Fig.4Pindistributingof40463.3R1R2CT.R2(R2=),R1CTf06.R2,R1CTfmin7.5Fig.5VCOelementarydiagram6R1CTf0Fig.6TherelationshipbetweenR1.CTandf07R1CTf0minFig.7Minimumfrequencyf0mindeterminedbyR1.CT8CD4046Fig.8FrequencymodulationcircuitcomposedofCD404682002,:R1=5kR2=100kCT=102PF4,8.V,R3R44046!,f.:V=4.290VVCO.:VCO2.53.7V,4046!2.5V,R3=36K,R4=36K,.1Table1LineartestforfrequencymodulationcircuitV(V)f(kHz)V(V)f(kHz)0.00225.5252.750109.0380.17029.3782.922114.4990.33833.6653.089119.8010.51138.3583.260125.2190.68243.3733.431130.5740.85448.4803.602135.8851.02253.6523.767141.0851.19459.0013.939146.2131.37264.6934.119151.7981.54470.1614.290156.9651.71175.5524.456161.9921.88381.0164.541164.4972.05486.6614.545164.6492.22692.1444.543164.5222.39397.5624.370165.8162.564103.0394.368165.726:[1]DK1997embebbedmodemdatabook.TDKsemiconductioncorp,1997,2-51,2-76.[2]I96TelecomLsiDatabook.MODEM/Others,1996,31-52.[3],.-[M].:,1990.[4],.[M].,1998.[5],.[M].:,1998.94:CD4046