Z-domain Analysis about the Impact of Op-Amp FDCG, NLDCG, GBW and SR on Performance of Switched-Capacitor Integrator
The corresponding variation form of the Z-domain transfer function of switched -capacitor integrator(behavioral simulation model) under the impact of op-amps four nonlinearities are explored in detail in this paper, which are finite direct-current gain(FDCG), nonlinear direct-current gain(NLDCG), slew rate(SR) and gain-bandwidth product(GBW) respectively. Its assumed that the integrator is free from the effect of SR and GBW when dealing with the FDCG and NLDCG, namely, in other words, the sampling and integrating can be finished in a very short time slot. Then based on the total charge conservation in sampling capacitor and integrating one, we find out the relationship between the input and output of the switched-capacitor integrator. After that, the relational expression is further translated into the Z-domain model. Especially, when looking into the effect of the finite SR and GBW, in order to establish the zero-input response during integration phase, we convert the issue into the zero-status response of the equivalent step input utilizing the equivalence principle between the charge and discharge of the sampling capacitor. In such a way, the complexity of the analyzing and calculating is effectively simplified. The presented mathematical analysis in this paper is the theoretical foundation of behavioral modeling and simulation for op-amps four nonlinear properties employing MATLAB/SIMULINK software tools.
SC integrator op-amp nonlinearity FDCG NLDCG GBW SR Z-domain transfer function behavioral modeling MATLAB/SIMULINK
Hong-Wei Ma Jian-Hui Wu
National ASIC System Engineering Research Center, South East University, Nanjing, China
国际会议
重庆
英文
863-868
2015-12-18（万方平台首次上网日期，不代表论文的发表时间）