同轴腔变容管调谐振荡器

Coaxial Cavity Varactors Tuned Oscillator

从体效应管、变容管的等效电路、特性．准确的参数表达式着手分析并、串振荡电路．根据管子参数、振荡频率能较准确地设计实用的压控振荡器．同时采用双变容管反向串联以增加调谐带宽，减少谐波，改善频谱．改善调谐线性．据此给出一个应用频段在５～９ＧＨｚ；调谐带宽＞１ＧＨｚ；输出功率＞１０ｍＷ；调谐速度＞１ＧＨｚ／ｕｓ； 主杂波比≥２５ｄＢ的宽带同轴压控振荡器实例．该振荡器已在数种电子对抗设备上长期稳定工作．

This article begins to start with the equivalent circuit. characteristic and exact formula expressed by the parameters or gunn and varactor, and analyses of serial and paral- lel oseillating circuit .According to the parameters of thc tubes and oscillating frequency. we can design practical voltage controlled oscillators with accuracy. At the same time, that ap- plying double varactors reverse serials is able to increase tuning bandwidth improve tuning linear and decrease harmonics. In view or the above, we can supply a practical example of wideband voltage controlled oscillator, whose specification for performances are frequency range 5- 9GHz, voltage tuned bandwidth> 1 GHz, power output> 10mW, tuning speed > 1 GHz / us; harmonics < -25dB. The oscillators have operated in several electronic countermeasures equipments for long-time.