基于一种新型的振荡机制,利用共振隧穿二极管(RTD)固有的负阻和双稳特性,与MOSFET器件相结合,首次实现了工作频率约为25MHz的RTD/MOSFET高频振荡电路.文章首先从理论上深人分析了该电路的振荡机理,然后通过高级设计系统(ADS)软件仿真和实验验证了此振荡电路的正确性.该电路的实现有望解决传统的基于RTD的振荡电路的功率限制问题,如果进一步用高电子迁移率晶体管(HEMT)等高频、高速器件取代MOSFET,可以在很大程度上提高这一电路的工作频率,并可实现RTD/HEMT的单片集成.因此该振荡电路在微波和射频领域具有广阔的应用前景。
Based on a novel oscillating mechanism,a 25MHz high-frequency oscillating circuit is achieved by combining resonant tunneling diode (RTD) characterized by intrinsic negative differential resistance (NDR)and bi-stability with a MOS-FET. The mechanism of this oscillating circuit is analyzed theoretically,and the correctness of the circuit analysis is verified by advanced design system (ADS) simulation and experiment. The realization of this circuit can solve the problem of power limitation in conventional RTD-based oscillating circuits. If using a high-frequency,high-speed device such as a high electron mobility transistor (HEMT) in stead of a MOSFET, this circuit can improve its frequency greatly and is more suitable for monolithic integration. Thus it can find wide applications in radio-frequency and microwave fields.