The design of the integrator of Sigma-delta modulator

摘要：

　　A kind of fully differential integrator is designed for the modulator of Sigma-delta ADC in this paper.Fully differential structure is adopted to enlarge the amplitude of output,restrain nonlinearity and increase competence of anti-interference.The frequency of signal in this design is 10kHz and the frequency of clock signal is 100kHz.The design of fully differential integrator,capacitive common mode feedback,two-phase unoverlapping clock and switched capacitor integrator are accomplished in this paper.The simulation results in Cadence using 0.5um process show that the low-frequency gain of operational amplifier is 69.87dB,unity gain bandwidth is 37.74MHz,phase margin is 67.73 degrees and slew rate is more than 31V/μs.

关键词： Sigma-delta modulator fully differential integrator two-phase unoverlapping clock

作者: Liu Xiaowei Chen Song Liu Liang Yang Jian Chen Weiping

作者单位: MEMS Center Harbin Institute of Technology, Harbin, Heilongjiang, China

会议类型: 国际会议

会议名称: 中国微米纳米技术学会第14届学术年会、第3届国际年会暨第6届微米纳米技术“创新与产业化国际研讨与展览会(CSMNT2012 & ICMAN2012)

会议地点: 杭州

会议语种:英文

页码: 1-5

在线出版日期: 2012-11-04（万方平台首次上网日期，不代表论文的发表时间）