【摘要】 为了实现高速模数转换器中的编码电路,研究了编码电路常用的格雷码和二进制编码2种编码方式.结合模数转换器的实际工作条件,从误差来源、误差分布、整体功耗、电路规模等方面对2种编码进行了对比.分析结果表明,在不同的应用条件下2种编码方式具有各自的优缺点,在量化位数较低的情况下,二进制编码比格雷码在某些方面更具有优势.最后基于一个量化精度为6位的高速模数转换器,在中芯国际(SMIC)0.18μm互补金属氧化物半导体(CMOS)工艺下,采用二进制编码方式设计了一个高速编码电路.实际测试结果表明,该编码电路在2GHz速度下工作状态良好.更多还原

【Abstract】 To realize the encoder in the high-speed ADCs(analog-to-digital converter),the comparisons between gray and binary encoders which are often used in the ADCs are discussed.With the considerations of the errors sources,error distribution,total power and circuit scale in actual working,the comparisons are discussed and the results show that the two encoding methods have the respective disadvantages and advantages under different application conditions.The binary encoder has more advantages than the gray encoder at lower quantized bits.Based on a 6-bit high-speed ADC,a high-speed binary encoder is designed in SMIC 0.18 μm CMOS(complementary metal oxide semiconductor) technology.The measurement of the chip shows the encoding circuit can work well at high speeds up to 2 GHz.更多还原