10位100MHz CMOS流水线A/D转换器

A 10-Bit 100MHz CMOS Pipelined A/D Converter

介绍了一种10位100MS/s流水线A/D转换器的设计方法,采用增益提升技术,实现了增益为100dB和单位增益带宽为1.2 GHz的高性能跨导运算放大器。改进了系统的延时单元,能够准确地锁存输出信号,减少噪声的影响。仿真结果表明,整个系统的有效位数提高了0.5位。整个系统基于TSMC 0.18μm CMOS工艺进行仿真,结果表明,整个电路的各个工艺角在温度为-20℃~85℃下均能满足100 MHz采样率流水线A/D转换器的要求。

A 10-bit 100 MS/s CMOS pipelined A/D converter was presented.By using gain boost technique and a new auxiliary operational amplifier,a high performance OTA with a DC gain of 100 dB and a GBW of 1.2 GHz was realized.An improved digital correction unit was employed,which can store output digital signal accurately,and alleviate effects of noise.It has been demonstrated that the effective number of bits of the system was improved by 0.5 bit.Simulation based on TSMC＇s 0.18 μm CMOS process showed that,at all process corners in the temperature range from-20 ℃ to 85 ℃,the proposed circuit could satisfy requirements for 10-bit 100 MHz pipelined ADC.