verilog-a 建模，在Cadence 中建立一个二级运放的VerilogA行为级模型，并进行建立时间等等仿真，以及对S/H电路的建模和仿真。 -verilog-a model in Cadence to create a secondary op amp VerilogA behavioral model and the simulation set-up time, etc., as well as S/H circuit