应用于太赫兹源信号实现的宽带四倍频链路设计

Design of a wideband frequency quadrupler for signal generation at terahertz

由于集成电路工艺截止频率Ft的限制,直接通过振荡器获取的太赫兹信号源具有输出功率低、带宽较窄等问题。针对该问题,提出一种可实现高性能太赫兹源的宽带倍频链路设计。对比了传统push-push技术与改进的跨导增强push-push技术,并提出将跨导增强push-push技术运用到倍频器中,提高了倍频链路的倍频增益;在链路级间采用具有幅度与相位纠正功能的新型有源巴伦结构,进一步提高了倍频器的倍频增益与谐波抑制性能。仿真结果表明,倍频链路可实现带宽为210~256 GHz,饱和输出功率为-0.5 dBm,峰值倍频增益为-0.55 dB的太赫兹信号源,链路的总直流功耗仅为30.6 mW。

Due to the limitation of Ft of integrated circuit technologies,the method of directly obtaining THz signals source through fundamental oscillator has problems of low output power and narrow bandwidth.A wideband frequency quadrupler chain for high performance THz signal sources is proposed to solve these problems.The improved gm-boosted push-push technology is compared with the traditional push-push technology and applied to frequency multipliers to improve the conversion gain of the frequency quadrupler chain.A novel active balun with amplitude and phase correction technique is adopted in the frequency quadrupler chain to further improve the conversion gain and harmonic suppression.The simulation results show that the 3 dB bandwidth of the quadrupler chain is 210~256 GHz,the saturated output power is-0.5 dBm,the peak conversion gain is-0.55 dB and the dc power consumption is 30.6 mW.