一种S波段压控振荡器级联的注入锁定

Cascading injection locking of S-band Voltage-Controlled Oscillators

针对压控振荡器(VCO)阵列注入锁定电路复杂和规模受限问题,提出一种S波段VCO阵列级联的新方法。通过在多个VCO之间加入耦合网络,将传统的单级注入改进为级联注入锁定,并通过网络级联方式实现级联级数的扩展。各级VCO之间通过耦合网络实现级联,首级VCO通过信号源参考信号进行锁定,次级VCO耦合前级VCO射频输出端信号进行锁定,每级均通过VCO电压调谐端进行注入。注入信号可锁定VCO输出频率,改善每级VCO输出相位噪声。通过级间耦合的形式,实现了一个微波源锁定多个VCO的输出。设计加工了2种级联注入VCO阵列,VCO的输出频率与注入信号频率相同,各级VCO相噪保持一致,当源相噪为-107.28 dBc/Hz时,各级VCO的输出相噪保持一致,为-105 dBc/Hz。该注入锁定方式电路简洁且成本低,未来有望应用在相控阵中。

A cascading injection locked S-band Voltage-Controlled Oscillator(VCO)array is proposed in this paper.It facilitates the VCO array configuration and enhances its scale by using cascading injection-locked method instead of traditional single order injection method.All VCOs are cascaded by coupling network.At the same time,it is easy to increase the stage of cascaded circuits.A reference signal is injected into the first VCO.The second VCO is locked through the signal coupled from the output of the previous VCO.Each reference signal is injected into the VCO through its voltage tuning port.It locks the output frequency and decreases the phase noise.Multiple VCOs are locked by one signal through coupling in between.Two cascading injection-locked VCO arrays are designed,fabricated,and measured.The VCOs output identical frequencies with similar phase noises.The phase noise of each VCO is near to-105 dBc/Hz,when the phase noise of the source is-107.28 dBc/Hz.The injection-locking method is simple and low-cost,which has future applications in phased arrays.