目前很多模数转换器(ADC)缺乏仿真模型,为了大型模数混合信号系统建模与仿真的需要,提出一种基于VHDL模拟混合信号扩展(VHDL Analog and Mixed-Signal Extensions,VHDL-AMS)的流水线ADC结构式建模方法.以多比特位每级的12位分辨率、10 M...目前很多模数转换器(ADC)缺乏仿真模型,为了大型模数混合信号系统建模与仿真的需要,提出一种基于VHDL模拟混合信号扩展(VHDL Analog and Mixed-Signal Extensions,VHDL-AMS)的流水线ADC结构式建模方法.以多比特位每级的12位分辨率、10 MSPS流水线ADC作为建模对象,根据流水线ADC的结构特征,在考虑非理想因素误差情况下,分别建立采样保持放大和乘法数模转换器的VHDL-AMS子模型,然后通过例化建立顶层流水线ADC的结构模型.通过SystemVision和Simulink联合仿真,得到静态性能参数微分非线性度和积分非线性度均小于1LSB,动态性能参数无杂散动态范围94.941 7dB,总谐波失真-94.941 9dB,信噪比58.754 4dB,验证了所提建模方法合的理与有效.展开更多
A model of the operational amplifier based on VHDL-AMS is proposed. According to needs of simulating the total ionizing dose(TID) radiation effect, parameters of operational amplifier are taken into account when the p...A model of the operational amplifier based on VHDL-AMS is proposed. According to needs of simulating the total ionizing dose(TID) radiation effect, parameters of operational amplifier are taken into account when the performance is specified. The operational amplifier model used for the TID radiation effect simulation is completed after verifying each modeled parameter. And a parameter for describing the external environment is introduced to make the model combined with TID. Finally, an example is used to illustrate the TID effect on the operational amplifier of MC14573, proving the validity of the model.展开更多
This paper deals with two basic issues of fuel cell research: modelling and experimental validation. In particular, the EIS (electrochemical impedance spectroscopy) technique is applied to a PEMFC (proton exchange...This paper deals with two basic issues of fuel cell research: modelling and experimental validation. In particular, the EIS (electrochemical impedance spectroscopy) technique is applied to a PEMFC (proton exchange membrane fuel cell). Experiments have been performed using a low-cost test bench and instrumentation developed around a 1,200 W Ballard Nexa fuel cell system. An electrical and dynamic model in VHDL-AMS language for PEM fuel cell stack is described. The privileged approach in this paper is an electrical method. Few papers deal with the modelling of a fuel cell in VHDL-AMS language with an electric approach. The fuel cell is characterised cell wise in VHDL-AMS; AC and DC measurements show the good agreement between the simulation results of the model and those measured in experiments. The model is capable to predict accurate stack profiles. The model is validated using temporal and impedance spectroscopy method; the impedance spectroscopy is performed at low and high frequencies. The experimental and simulated Nyquist plots show that the frequency response of the fuel cell stack can be predicted by the proposed fuel cell stack model. At high frequencies, comparisons between experimental and model impedance results are performed and show some similarities between the two Nyquist. Error between the two approaches is below 1.5%.展开更多
文摘目前很多模数转换器(ADC)缺乏仿真模型,为了大型模数混合信号系统建模与仿真的需要,提出一种基于VHDL模拟混合信号扩展(VHDL Analog and Mixed-Signal Extensions,VHDL-AMS)的流水线ADC结构式建模方法.以多比特位每级的12位分辨率、10 MSPS流水线ADC作为建模对象,根据流水线ADC的结构特征,在考虑非理想因素误差情况下,分别建立采样保持放大和乘法数模转换器的VHDL-AMS子模型,然后通过例化建立顶层流水线ADC的结构模型.通过SystemVision和Simulink联合仿真,得到静态性能参数微分非线性度和积分非线性度均小于1LSB,动态性能参数无杂散动态范围94.941 7dB,总谐波失真-94.941 9dB,信噪比58.754 4dB,验证了所提建模方法合的理与有效.
基金supported by the National Natural Science Foundation of China (No. 61303034)Aeronautical Science Foundation of China (No. 2013ZD31007)
文摘A model of the operational amplifier based on VHDL-AMS is proposed. According to needs of simulating the total ionizing dose(TID) radiation effect, parameters of operational amplifier are taken into account when the performance is specified. The operational amplifier model used for the TID radiation effect simulation is completed after verifying each modeled parameter. And a parameter for describing the external environment is introduced to make the model combined with TID. Finally, an example is used to illustrate the TID effect on the operational amplifier of MC14573, proving the validity of the model.
文摘This paper deals with two basic issues of fuel cell research: modelling and experimental validation. In particular, the EIS (electrochemical impedance spectroscopy) technique is applied to a PEMFC (proton exchange membrane fuel cell). Experiments have been performed using a low-cost test bench and instrumentation developed around a 1,200 W Ballard Nexa fuel cell system. An electrical and dynamic model in VHDL-AMS language for PEM fuel cell stack is described. The privileged approach in this paper is an electrical method. Few papers deal with the modelling of a fuel cell in VHDL-AMS language with an electric approach. The fuel cell is characterised cell wise in VHDL-AMS; AC and DC measurements show the good agreement between the simulation results of the model and those measured in experiments. The model is capable to predict accurate stack profiles. The model is validated using temporal and impedance spectroscopy method; the impedance spectroscopy is performed at low and high frequencies. The experimental and simulated Nyquist plots show that the frequency response of the fuel cell stack can be predicted by the proposed fuel cell stack model. At high frequencies, comparisons between experimental and model impedance results are performed and show some similarities between the two Nyquist. Error between the two approaches is below 1.5%.