【摘要】 针对生物医学成像中前端读出电路多通道以及要求高速数字化的特点,设计了一个16通道的流水线数字化电路.整个电路由模拟多路选择器、单端转差分电路、8-bit 25Ms/s 1.5bit/stage流水线ADC以及数据输出模块组成.模数转换和数据输出在两相邻时间窗口内采用流水线方式进行.电路采用TSMC 0.18μm mixed signalCMOS工艺实现.电路仿真结果表明,流水线ADC的DNL为-0.62/0.67LSB,INL为-0.39/0.72LSB,SNR为45.99dB,ENOB为6.03bit,该电路能够在两个相邻时间窗口内完成16通道的信号数字化并输出,满足系统设计要求.更多还原

【Abstract】 Based on the multi-channel and high-speed digitization features of front-end readout circuits for biomedical imaging,a 16-channel pipeline digitization circuits is designed.The whole circuits consist of analog multiplexer,single end to differential signal conversion circuit,8-bit 25-Msample/s pipeline ADC,and data output module.Analog-to-digital conversion and data output will be executed in the pipeline way.The circuit is designed in TSMC 0.18 μm mixed signal CMOS technology.Simulation results show that,pipeline ADC has-0.62/0.67 LSB DNL,-0.39/0.72 LSB INL,45.99 dB SNR,and 6.03 bit ENOB.The designed circuits can accomplish the digitization and output of 16-channel analog signals within two adjacent timing windows,satisfying the performance requirements of the system.更多还原