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传统的基于Matlab/Simulink的高速高精度流水线ADC模型对电路设计具有指导作用,但是与实际电路存在一定的差距。为了提高模型的准确性,通过分析折叠式增益增强型运放的特点,建立基于SMIC 0.18μm混合CMOS工艺的运放传输函数和相对符合实际的数学模型。将运放建模分析结果与采用同一工艺设计的实际电路仿真结果进行对比,验证了模型的有效性。在考虑实际电路中各种非理性因素的情况下,建立14位100MHz流水线ADC模型,给出了理想情况下与添加非理想因素后流水线ADC模型的输出指标,对实际电路的设计具有指导意义。
The traditional high-speed and high-precision pipeline ADC model based on Matlab / Simulink can guide the circuit design, but there is a certain gap with the actual circuit. In order to improve the accuracy of the model, the op amp transfer function based on the SMIC 0.18μm hybrid CMOS process and the relative mathematical model are established by analyzing the characteristics of folded gain amplifier. The optoelectronic modeling and analysis results are compared with the actual circuit simulation results using the same process design to verify the effectiveness of the model. Considering all kinds of irrational factors in the actual circuit, the 14-bit 100MHz pipeline ADC model is established, and the output index of the pipeline ADC model under ideal conditions and non-ideal factors is given, which is of guiding significance for the design of the actual circuit.