Q波段片上接收系统的关键技术研究

项目名称： Q波段片上接收系统的关键技术研究

项目编号： No.11303078

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 陈莹

作者单位： 中国科学院上海天文台

项目金额： 30万元

中文摘要： Q波段是开展射电天文谱线和连续谱观测的主要波段，高灵敏度深度巡天成为大口径射电望远镜的重要科学目标，被称为Radio Camera的超大规模Q波段多波束接收系统研发至关重要。本项目针对Q波段片上接收系统的关键技术开展研究，首次提出了单片微波集成电路MMIC到片上系统SOC的迈进，拟选用台湾稳懋公司0.1um GaAs pHEMT半导体工艺，将低噪声放大器、混频器等接收机前端设备进一步集成，完成对信号的低噪声放大和变频等工作，极大地减小电路尺寸，提高稳定性和一致性。本项目采用镜像抑制变频设计和双平衡式混频结构，实现双边带中频输出，提高了端口隔离度，有效改善了信号串扰问题。同时，系统对本振二次谐波的应用大大降低了本振频率，有利于电路向更高频率发展。本项目先期已进行过MMIC的预研，成功研制了三款低噪声放大器，并且对晶体管建立了小信号及噪声模型，可行性高，实用性强，有很强的科学研究价值。

中文关键词： 片上接收系统；单片微波集成电路；混频器；低噪声放大器；

英文摘要： Q-Band is an important frequency range in radio astronomy for continuum and line observations. Since high sensitivity deep sky survey has become the main science goal for large diameter radio telescope, it's imperative to develop Q-Band multi-beam receiving system which is called Radio Camera. The project intends to research the key technologies of Q-Band system on chip receiver and first proposes the advanced development from MMIC to SOC. Main devices in a receiver such as LNA and mixer will be integrated into an entire system based on WIN 0.1um GaAs pHEMT process to realize a series of functions like low noise amplification and frequency convert for RF signals. It will largely reduce the circuit size and improve the stability and uniformity. The system will be designed with image rejection and double-balanced mixer structure to realize USB and LSB IF output, improve port isolation and signal interference. Also, the LO frequency will be reduced by using its second harmonics, which makes it possible for the IC system to get to a higher frequency. Advanced research has been completed with three LNAs, and transistors' small signal model and noise model, which ensures the project to be done properly and successfully. It's very practical and has strong scientific research value.

英文关键词： Receiver SOC；MMIC；mixer；LNA；