适用于高速信号传输的低失真及宽带模拟开关  

Low-distortion high-bandwidth analog switch applied to high-speed signal transmission

作　　者：曹寒梅[1] 蔡伟[2] 杨银堂[1] 陆铁军[2] 王宗民[2] 

机构地区：[1]西安电子科技大学宽禁带半导体材料与器件教育部重点实验室,陕西西安710071 [2]北京微电子技术研究所,北京100076

出　　处：《西安电子科技大学学报》2008年第5期838-841,共4页Journal of Xidian University

基　　金：国家自然科学基金资助(60476046,60676009)

摘　　要：提出了一种应用于高速信号传输系统的低失真、宽带自举模拟开关电路．所提出开关的栅源过驱动电压由NMOS和PMOS开启电压之和决定，并能够实现轨到轨（rai-to-rail）输入范围内开关的栅源电压与阈值电压之差（KGST）保持恒定，而且基本消除了体效应的影响．采用TSMC0．18μmCMOS工艺，HSPICE仿真结果表明，输入信号在0～1．8V之间变化时，开关的KGST基本保持恒定，其-3dB带宽大于10GHz；当输入信号的频率为1．5GHz，满摆幅电压为0．8V时，输出信号几乎能够无衰减的跟随输入信号，其无杂散动态范围为65．4dB．A low-distortion high-bandwidth bootstrap analog switch suitable for high-speed signal transmission is presented. The gate-to-source voltage of the switch is set by the combined on-voltage of a PMOS and an NMOS, and the difference between the gate-source voltage and the threshold voltage （Vcsr） of the switch is constant with a rail-to-rail input, with the body effect also nearly canceled. Implemented in the TSMC 0. 18 μm CMOS process, results from HSPICE simulation show that the VGST is nearly constant with the input ranging from 0 to 1.8 V, and that the --3 dB bandwidth is larger than 10 GHz. When the input frequency is 1.5 GHz, and full-scale range is 0. 8 V, the output can follow the input nearly without attenuation, and its SFDR（spurious free dynamic range） is 65.4 dB.

关 键 词：低失真 高频 轨到轨 开关 自举 

分 类 号：TN432.1[电子电信—微电子学与固体电子学]