摘要
压控振荡器(VCO)在通信、雷达、测试仪器等领域中的应用非常广泛,但宽带调谐、低相噪一直是VCO设计的瓶颈。通过对负阻原理的分析,根据三极管的等效电路参数采用准线性法对最佳谐振元件进行了估算,从而提高了对VCO设计的准确性和时效性。由变容二极管对和PC电感组成的并联谐振网络,实现了宽带调谐、低相噪,并对三次谐波分量有所抑制。通过最后的实验测试,调谐电压在5~18 V时,频率覆盖范围为468 MHz^1.13 GHz,相位噪声?105 dBc/Hz@10 kHz at 969.27 MHz,输出功率?1 dBm,调谐灵敏度为34 MHz/V。
VCO is widely used in the field of communication,radar and test equipment,but the broadband tuning and low phase noise has been a bottleneck of VCO design.Based on the principle of negative resistance,in this paper the best harmonic components was estimated using quasi-linear method according to the equivalent circuit parameters of transistor,thereby improving the accuracy and effectiveness of the VCO design.The parallel resonant network composed of the varactor diode and the PC inductor achieves broadband tuning,low phase noise,and suppresses the third harmonic component.Through the last laboratory testing,when tuning voltage is 5 ~ 18 V,the frequency ranging from 468~1.13 GHz,phase noise ？105 dBc/Hz@10 kHz at 969.27 MHz,output power about ？1 dBm,tuning sensitivity 34 MHz/V.
出处
《电子测量与仪器学报》
CSCD
2011年第9期817-822,共6页
Journal of Electronic Measurement and Instrumentation
基金
新一代宽带无线移动通信网科技重大专项(编号:2009ZX03001-005-01)资助项目
