CAJ | 학술논문

基于反馈式正弦波振荡器原理,设计出一款适合于UHF波段的高稳频型射频振荡器,本设计使用了高Q值选频技术,利用回路的谐振特性设计出多级的选频结构。振荡器输出频率范围：400 MHz~720 MHz,输出带宽大于300 MHz,属宽带射频振荡器。测试结果表明,在可用频段范围内,振荡器输出增益波动低于1 dB,输入驻波比VSWR<1.5 dB,输出驻波比VSWR<1.7 dB；中心频率f0=510 MHz时：频偏Δf=1 kHz处,相位噪声PN=-77.9 dBc/Hz；频偏Δf=10 kHz处,相位噪声PN=-95.8 dBc/Hz；频偏Δf=100 kHz处,相位噪声PN=-140.3 dBc/Hz；当频偏继续增加时,相位噪声呈指数下降。本设计可满足电视系统、无线对讲机系统、无线遥控系统等多种主流射频领域的应用要求。
기우반궤식정현파진탕기원리,설계출일관괄합우UHF파단적고은빈형사빈진탕기,본설계사용료고Q치선빈기술,이용회로적해진특성설계출다급적선빈결구。진탕기수출빈솔범위：400 MHz~720 MHz,수출대관대우300 MHz,속관대사빈진탕기。측시결과표명,재가용빈단범위내,진탕기수출증익파동저우1 dB,수입주파비VSWR<1.5 dB,수출주파비VSWR<1.7 dB；중심빈솔f0=510 MHz시：빈편Δf=1 kHz처,상위조성PN=-77.9 dBc/Hz；빈편Δf=10 kHz처,상위조성PN=-95.8 dBc/Hz；빈편Δf=100 kHz처,상위조성PN=-140.3 dBc/Hz；당빈편계속증가시,상위조성정지수하강。본설계가만족전시계통、무선대강궤계통、무선요공계통등다충주류사빈영역적응용요구。
A new design of the RF oscillator for the UHF-band is presented. In order to get a higher Q value,a multi-ple frequency selection network is used,which is composed by both series components and parallel components. For this RF oscillator,the operating frequency range is 400 MHz~720 MHz,with a 300 MHz relative bandwidth. The test results show that,in the available frequency range,the fluctuations of the output power is less than 1 dB,input VSWR<1.5 dB,output VSWR<1.7 dB;When the carrier frequency is 510 MHz,the phase noise PN=-77.9 dBc/Hz,atΔf=1 kHz;phase noise PN=-95.8 dBc/Hz,at Δf=10 kHz;phase noise PN=-140.3 dBc/Hz,atΔf=100 kHz. If the fre-quency deviation is on the increase,the value of the phase noise will decreases exponentially. This RF oscillator can be widely used in many UHF devices and products,such as the TV system,the wireless intercom system,the remote control system etc.