High Sensitivity VCO Design for 24 GHz FMCW Radar

• Main Authors: Huang, Yun-Ru, 黃永儒
• Other Authors: Chung, Shyh-Jong
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/4rkf5n

碩士 === 國立交通大學 === 電機學院電信學程 === 102 === In this thesis, one RF front end circuit; a 12GHz novel VCO has proposed.It can be applied to 24GHz FMCW radar applications and which fabricates with Rogers RO4003 substrate, NEC NESG2030M04 SiGe NPN BJT and Skyworks SMV1231 varactor. A common-Emitter construction has employed to the proposing 12GHz high sensitivity VCO. The Ccb which is between base and emitter of BJT is used to be a feedback path to let BJT plays as negative resistance so it generates wide band signal. Then resonator is designed by microstrip line and varactor. Resonator has two major functions; one is to store RF power which generates by negative resistance and the other one is to pure the resonating frequency. The phase noise is -90.33dBc/Hz at 100 kHz offset and -105.67dBc/Hz at 1 MHz offset. Maximum output power is -0.67dBm. And tuning range can reach to 172.5MHz with 0V to 3.3V control voltage. It’s equal to 52.3MHz/V.