摘要：This paper presents the design of 0.5 V multi-gigahertz cascode CMOS LNA for low power wireless communication. By splitting the direct current through conventional cascode topology, the constraint of stacking- MOS structure for supply voltage has been removed and based on forward-body-bias technology, the circuit can operate at 0.5 V supply voltage. Design details and RF characteristics have been investigated in this paper. To verify the investigation, a 0.5 V 5.4 GHz LNA has been fabricated through 0.18 μm CMOS technology and measured. Measured results show that it obtains 9.1 dB gain, 3 dB NF with 0.5 V voltage and 2.5 mW power dissipation. The measured IIP3 is -3.5 dBm. Compared with previously published cascode LNA, it achieves the lowest supply voltage and lowest power dissipation with competitive RF performances.

摘要：In order to calibrate electrical instruments and generate a constant magnetic field, a novel design method for square Helmholtz coil is proposed. According to the superposition principle in electromagnetics, the theory of the square Helmholtz coil is established, and the design method is verified by Matlab calculation. Compared with conventional circular Helmholtz coil, the novel square one is with a larger uniform region. Simulation work is conducted in Maxwell, and the distribution of the magnetic field is obtained. The results demonstrate the validation of the applied calculation method of the proposed Helmholtz model. The space utilization rate η is used to make a comparison between the square and circular coils for the uniform region. The square Helmholtz coil is fabricated, the length of a single square coil is 1.5 m, and the amplitude of the magnetic field is controlled by the current. The GSM-19 T proton magnetometer is used to measure the amplitude of the magnetic field generated by the square Helmholtz coil. Experimental results indicate that a wide-range variable uniform magnetic field from 0 to 120 μT is generated in the center of Helmholtz coils.

摘要：提出了一种用于高速差分线的新型宽带共模噪声滤波器,通过在差分信号线的参考地平面上刻蚀共面波导形式的1/4波长谐振器进行实现.建立了该结构的等效电路模型,分析结果与全波电磁仿真以及实验测量结果一致.结果表明,滤波器在3.96~8.26GHz频率范围内实现了20dB的共模噪声抑制,同时保证良好的差分信号传输特性.与已有设计相比,在尺寸、成本和性能上具有综合优势.

摘要：近年来,基于碳基材料的纳米尺度互连方案得到了人们的广泛关注,为下一代集成电路的互连技术提供了一种全新的解决途径.基于国内外在碳纳米互连建模和特性研究方面的进展,并结合本课题组取得的相关成果,对集成电路碳纳米管互连的等效电路建模、时延特性以及热特性进行了系统的分析,并与传统铜互连进行了全面比较.最后对具有实用前景的碳纳米异质互连技术进行了简要介绍和展望.

摘要：利用加权拉盖尔多项式-时域有限差分方法(WLP-FDTD)对高速电路中非均匀传输线进行瞬态分析和计算.根据传输线等效电路模型的电报方程,采用拉盖尔基函数展开电流电压表达式,并利用其正交性,避免了稳定约束条件进而得到方程的解.与传统的时域有限差分方法(FDTD)相比,提出的方法分离了时间和空间变量,不受稳定条件的约束,在对传输线离散段数较多时,具有较高的计算速率.仿真结果表明在传输线的分析中采用WLPFDTD比FDTD的效率更高,最后开发了基于WLP-FDTD多根传输线的仿真软件.

摘要：分析了无通孔接地板对共面波导(CPW)至微带转换过渡的影响.计算和实验结果显示,如果在缩短其长度的同时加宽其宽度,可以有效地增加转换的带宽.通过等效电路做出了一定的解释,同时提供了简单的无通孔CPW至微带转换设计指导方法.

摘要：针对标准单元模式的超大规模集成电路布局问题,本文提了一种新的基于线长和时延双重优化目标的布局算法。在以优化线长为目标函数的布局结果基础上,进一步优化了芯片的时延特性,并通过算法设计较好地解决了二者优化方向的一致性。通过标准单元测试电路的实验结果比对,该算法在线长及时延优化方面综合性能良好。

摘要：芯片与微电子系统是现代电子信息与智能技术的基础,芯片由集成电路(integrated circuits,IC)技术实现,而微电子系统则可由本文提出的集成系统(integrated systems,IS)技术实现.集成系统概念的提出参照了集成电路的思想,并基于以下4方面原因:首先,集成电路是手段,系统才是目的,单个集成电路往往不具备系统功能,需要与其他电路或元器件相结合才能构成系统.其次,标准硅基集成电路的摩尔定律已面临挑战.第三,微电子系统的前道芯片设计加工与后道封装集成逐步收敛.最后,目前的封装集成技术采取分立的实施步骤.集成系统研究如何将各种不同材料、不同工艺、不同结构的元器件、天线、集成电路芯片进行集成,实现所需功能和性能的微电子系统.集成系统的一个核心理念是能否像设计、加工集成电路一样设计、加工微电子系统.本文将介绍集成系统的背景、概念、特征、面临的挑战、需解决的关键科技问题,以及一些研究进展.

摘要：Amidst the development of photoelectrochemical(PEC)CO_(2) conversion toward practical application,the production of high-value chemicals beyond C1 compounds under mild conditions is greatly desired yet ***,through rational PEC device design by combining Au-loaded and N-doped TiO_(2) plate nanoarray photoanode with Zn-doped Cu_(2)O dark cathode,efficient conversion of CO_(2) to CH3COOH has been achieved with an outstanding Faradaic efficiency up to 58.1%(91.5%carbon selectivity)at 0.5 V ***/*** programmed desorption and in situ Raman spectra reveal that the Zn-dopant in Cu_(2)O plays multiple roles in selective catalytic CO_(2) conversion,including local electronic structure manipulation and active site modification,which together promote the formation of intermediate*CH2/*CH3 for C-C *** from that,it is also unveiled that the sufficient electron density provided by the Au-loaded and N-doped TiO_(2) plate nanoarray photoanode plays an equally important role by initiating multi-electron CO_(2) *** work provides fresh insights into the PEC system design to reach the multi-electron reduction reaction and facilitate the C-C coupling reaction toward high-value multicarbon(C2+)chemical production via CO_(2) conversion.