流水线模数转换器中的宽带电流型运算放大器

发布时间：2018-03-29 17:02

本文选题：模数转换器　切入点：运算放大器　出处：《光学精密工程》2014年10期

【摘要】：针对高清视频信号处理对动态范围大,运算速度快的模数转换器(ADC)的要求,提出了一种流水线宽带电流型运算放大器。该运算放大器的主放大器采用套筒式增益提高结构,辅助运算放大器用电流型放大器替代。采用电流共模反馈电路调节主运算放大器的支路电流以稳定输出共模电平;采用TSMC 0.18μm CMOS工艺设计电路。实验结果显示:辅助运算放大器采用源极输入,减小了信号主通路上的寄生电容,提高了整个运算放大器的电路速度。运算放大器的增益为83.19dB,相位裕度为61.6°,单位增益带宽为1.6GHz,功耗为9.3mW;在满幅度阶跃输入的情况下,输出建立时间小于1.83ns。将该运算放大器用于高清视频信号的流水线ADC中,实现了170MS/s,10bit精度的模数转换。同传统的电压型运算放大器相比,该运算放大器响应速度更快,功耗更低,可满足处理视频信号的要求。
[Abstract]:In order to meet the requirements of high definition video signal processing for A / D converter with large dynamic range and high speed, a pipeline wideband current-mode operational amplifier is proposed. The main amplifier of the operational amplifier adopts a sleeve type gain enhancement structure. The current common-mode feedback circuit is used to adjust the branch current of the main operational amplifier to stabilize the output common-mode level. The circuit is designed by TSMC 0.18 渭 m CMOS process. The experimental results show that the auxiliary operational amplifier uses the source input to reduce the parasitic capacitance in the main signal path. The gain of the operational amplifier is 83.19 dB, the phase margin is 61.6 掳, the unit gain bandwidth is 1.6 GHz, and the power consumption is 9.3 MW. The output setup time is less than 1.83ns.The operational amplifier is used in pipeline ADC with high definition video signal to realize the A / D conversion with 170 MS / s / 10 bit precision. Compared with the traditional voltage-mode operational amplifier, the operational amplifier has faster response speed and lower power consumption. It can meet the requirements of video signal processing.
【作者单位】：太原理工大学新型传感器与智能控制教育部重点实验室;
【基金】：国家自然科学基金资助项目(No.61240017) 教育部博士点基金资助项目(No.20121402120019)
【分类号】：TN941;TN722.77

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