标题: 互补式金氧半两阶式类比至数位转换器之设计与分析
Design and Analysis of CMOS Two-Step Analog to Digital Converter
作者: 蔡仁哲
Jen-Che Tsai
吴锦川
Dr. Jiin-Chuan Wu
电子研究所
关键字: 类比至数位转换器;两阶式类比至数位转换器;高速类比至数位转换器;比较器;analog to digital converter;two-step analog to digital converter;high speed analog to digital converter;comparator
公开日期: 2000
摘要: 本文描述一个附有数位修正电路的互补式金氧半两阶式类比至数位转换器。文中对于它的主要元件包含约略比较器(coarse comparator)和精密比较器(fine comparator)有详细的设计与分析,而其中的参考电压产生器(reference voltage generator)是以电阻平分上下两个电压参考点,所使用的数位至类比转换器则利用一组开关(switch box)配合参考电压产生器来选择输出的值取代了一般需要使用运算放大器(operational amplifier)的方式。由于此类比至数位转换器的上下参考电压分别是1伏特和0伏特,所以输入讯号的范围就是由0伏特到1伏特。经由HSPICE的模拟,结果显示此类比至数位转换器在工作电压3.3伏特,以每秒50个百万取样的速度可达到8位元的解析度。此类比至数位转换器是以1P4M 0.35微米互补式金氧半制程来实现。因为类比至数位转换器电路中的电容都只用P型金氧半电晶体来实现所以它的晶片面积只有1.4mm x 1.3mm。这个类比至数位转换器电路经实际量测后得知它工作为3.3伏特, 速度为50个百万取样下的功率消耗小于40毫瓦特。
In this thesis, a CMOS two-step A/D converter with digital error correction circuit is described. The main components, coarse comparators and fine comparators, are designed and analyzed in detail. The reference voltage generator is a resistor ladder that divides the top and the bottom reference voltages. The D/A converter utilizes a switch box merged with the voltage generator, instead of using an operation amplifier. The top and the bottom reference voltages are 1V and 0V, respectively. So, the input voltage range of the A/D converter is from 0V to 1V. The simulation results performed by HSPICE show that the A/D converter achieves 8-bit resolution at 50M sampling rate when the supply voltage is 3.3V.The A/D converter is implemented by a 1P4M 0.35um CMOS process. The chip area of the A/D converter with pad is only 1.4mm x 1.3 mm because the capacitors in the A/D converter are formed by PMOS. The chip has been tested and the power consumption without output buffers at 3.3V, 50MSample/s is less than 40mW.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT890428032
http://hdl.handle.net/11536/67104
显示于类别:Thesis