介绍了一种采用新颖谐振器的低相位噪声窄带压控振荡器 (VCO)的设计方法。该谐振器采用源与负载横向交叉耦合结构, 形成一个传输零点, 提高了谐振器的 Q值。该谐振器通过弱耦合与变容二极管连接, 从而实现电压控制滤波器通带中心频率调谐。利用该谐振器设计了一个窄带 VCO, 并在先进设计系统 (ADS)软件里仿真验证。该 VCO中心频率 6.15 GHz, 在调谐电压从 0到 15 V的范围内调谐带宽 60 MHz, 相位噪声在整个调谐范围内优于-132 dBc/Hz@1MHz, 输出功率为 8.4 dBm, 功率平坦度 ±0.1 dBm。

A novel low phase noise Voltage Controlled Oscillator(VCO) based on a new tuned resonator is introduced. This resonator adopts cross coupling between the source and load port and can produce a transmission zero so that improve the Q-factor. This resonator realizes the voltage controlled filter by using weak coupling between the resonator and the varactor. Finally the novel resonator is utilized to design a narrow band VCO which is simulated in Advanced Design System(ADS). The simulation results show that the center frequency of this VCO is 6.15 GHz, the tuning band is almost 60 MHz, phase noise is better than-132 dBc/Hz at 1 MHz offset frequency in the whole band, the output power is 8.4 dBm, and the flatness of the output power is ±0.1 dBm.