基于SIMULINK的开关型∑-△调制器行为级建模

为精确反映多种非理想因素对开关型∑-△调制器的影响,提高其在SIMULINK仿真器下的仿真精度,针对SIMULINK的行为级建模提出一种新的积分器模型.主要的改进之处包括:在运放模块中引入了有关直流增益非线性及信号建立过程非理想性的考虑,在开关模块中引入了电荷注入效应和导通阻抗的信号相关性影响,并将噪声模型作为独立模块引入系统.应用该模型进行SIMULINK仿真,并与TSMC 0.35μm混合信号工艺下SPICE仿真结果进行比较验证.结果表明,所提出的模型成功地反映了上述因素对电路的重要影响,模型的应用提高了SIMULINK的仿真精度.

High-Consistency Behavior Modeling of a Switched-Capacitor Sigma-Delta Modulator in SIMULINK

To improve the simulation accuracy of SIMULINK, a novel inclusive behavior model of an integrator is proposed that introduces the effects of different circuit nonidealities of a switched-capacitor sigma-delta modulator into SIMULIK simulation. The nonlinear DC gain and nonlinear settling process are introduced into the op-amp module. The signal dependent charge injection and nonlinear resistance are introduced into the switch module. In addition, the noise source in eluding flicker and thermal noise is introduced into system as an independent module. The novel model is verified by SIM ULINK behavioral simulations. The results are compared with results from circuit level simulation in Cadence SPICE using TSMC 0.35μm mixed signal technology. It shows that the novel model succeeds in introducing the influences of the nonidealities into behavior simulation to more realistically describe the circuit performances and increase the accuracy of SIMULINK simulation.