CAJ | 학술논문

设计一种用于高速高精度流水线ADC的流水线ADC子级电路,采用伪随机序列控制子ADC电路中比较器阵列的参考比较电压。比较器的高低位被随机分配,消除某个比较器的固有失调对子ADC量化的影响,温度计码的伪随机性可以消除MDAC电容的失配误差对余量输出的影响。电路采用0.18μm 1P5M 1.8 V CMOS工艺,运用于12 bit 250 Msample/s流水线ADC电路中,实际测得流水线ADC电路的SNR为69.92 dB,SFDR为81.17 dB。
설계일충용우고속고정도류수선ADC적류수선ADC자급전로,채용위수궤서렬공제자ADC전로중비교기진렬적삼고비교전압。비교기적고저위피수궤분배,소제모개비교기적고유실조대자ADC양화적영향,온도계마적위수궤성가이소제MDAC전용적실배오차대여량수출적영향。전로채용0.18μm 1P5M 1.8 V CMOS공예,운용우12 bit 250 Msample/s류수선ADC전로중,실제측득류수선ADC전로적SNR위69.92 dB,SFDR위81.17 dB。
A sub-circuit for high-speed, high-resolution pipelined ADC is presented. Reference voltages in comparators array are controlled by pseudorandom sequences. MSBs and LSBs of comparators are assigned randomly,accordingly the effect of offset of some comparator on ADC quantization is eliminated. Pseudo-random thermometer code cancels the effect of the mismatches of MDAC capacitors on residue output. This circuit implemented in 0. 18 μm 1P5M 1. 8 V CMOS process is applied to a 12-bit 250 Msample/s pipelined ADC. Test results shows that the ADC has an SNR of 69 . 92 dB and an SFDR of 81 . 17 dB.