【摘要】 在流水线结构A/D转换器中,参考电压的波动将会影响到其转换精度。文章分析了参考电压变化对A/D转换器整体性能的影响,通过Matlab仿真加以验证。并基于带隙基准源,为一个10位40 MHz采样频率的流水线A/D转换器设计了两个电压值为1/2VDD±0.5 V的参考电压源及其输出缓冲放大器。采用SMIC 0.35μm 3.3 V CMOS工艺,Hspice仿真结果显示,参考电压的最大波动小于0.3 mV,最大温度系数为12 ppm。更多还原

【Abstract】 The influence of the variation of reference voltages on the overall performance of the A/D converter is analyzed and the result is verified by Matlab simulation.Based on a bandgap reference source,two voltage reference sources of 1/2 V_DD ±0.5 V and their output buffers are designed for a 10-bit 40 MS/s pipelined A/D converter.Hspice simulation in SMIC 0.35 μm 3.3 V CMOS process shows the fluctuation of reference voltage is within 0.3 mV,and the temperature coefficient is lower than 12 ppm.更多还原