【作者】 牛世琪；

【导师】 何山虎；

【作者基本信息】 兰州大学 ， 微电子学与固体电子学， 2007， 硕士

【摘要】 随着电路系统数字化程度不断提高，模数转换器作为模拟信号与数字信号的接口电路，其作用也越来要重要，本文给出了一种流水线结构模数转换器的设计方案，对流水线结构原理进行了较为细致的分析介绍，论文从整体电路结构到具体电路的设计实现方面都作了许多工作。本次论文目标是设计最高采样时钟频率50M，转换精度为12位流水线型模数转换器，设计中采用了十级流水线模式的结构：第一级四位flash子模数转换器，后面为八级每级1.5位再加一位flash子模数转换器的流水线结构，子模块电路设计中我们完成了高精度的采样保持电路、高增益带宽积的运算跨导放大器电路、低失调电压低功耗高速度比较器电路、1.5位结构子模数转换电路以及数字校正电路、时钟产生以及稳定电路、基准电压产生和缓冲驱动电路以及参考电流源电路的设计．本次设计采用上华0.5um DPDM CMOS工艺试流片，应用Cadence Spectre仿真工具对电路仿真表明设计可以达到十二位精度要求，最高采样速率达到50Msample／s，测试结果静态参数指标达到了设计要求．本电路可以应用在音频，视频设备、通讯接收器的中频采样等领域。更多还原

【Abstract】 As an interface circuit of analog signal and digital signal, Analog to digital converters get more and more important with the digitalize of circuit system. This thesis submitted a design of 12 bit pipeline analog to digital converter. We did much work in the system architecture design and the transistor level module circuit design. The purpose of this thesis is design a 50Msample/s 12 bit resolution pipeline ADC . A ten stage pipelined architecture was used in this design .The first stage is an 4 bit flash sub ADC, followed by eight stages 1. 5 bit per stage sub ADC and an 1 bit flash ADC. These ten stages formed the ADC core. We accomplished the sub module circuits design, such as high resolution sample and hold circuit, high gain wide bandwidth operational transconductance amplifier ,low offset voltage、low power, high speed comparator, 1.5 bit per stage sub ADC, digital correction circuit, clock stabilization and generation circuit , the trasistor level band gap reference voltage with output buffers and current source reference circuit.This design was tape out based on CSMC 0.5um 2P2M CMOS process. The simulation and optimization of circuit is accomplished and the simulation results are obtained with Cadence Spectre. The simulation results show that the circuit can get 12 bit resolution . The highest sample rates can be 50MSample/s. The test results show that the requirement of the static performance of circuit units can be well achieved. This circuit can be used in the fields of video and audio instruments and the sample of intermediate frequency transceiver of communication.更多还原