Multisim13仿真软件在触发器中的应用分析

Application analysis of Multisim13 simulation software in flip flop

针对基本RS触发器、同步RS触发器、主从RS触发器、主从JK触发器四种电路,通过观察Multisim13仿真软件中四踪示波器显示的输入信号及输出信号的波形特征,对其时序波形发生“不确定状态”进行了分析,得到如下结果:对于前三种电路(基本RS触发器、同步RS触发器、主从RS触发器),由于触发器特性方程存在约束条件,若当输入信号不满足其约束条件时,则输出端可能出现“不确定状态”。而对于JK触发器电路来说,由于触发器特性方程不存在约束条件,因此,输出端不会出现“不确定状态”。

For the four circuits of basic RS trigger,synchronous RS trigger,master-slave RS trigger,and master-slave JK trigger,by observing the waveform characteristics of the input signal and output signal displayed by the four-track oscilloscope in Multisim13 simulation software,the authors analysis“uncertain state”of the timing waveform,and the following results is obtained:For the first three circuits(basic RS flip-flop,synchronous RS flip-flop,master-slave RS flip-flop),due to the constraints of the trigger characteristic equation,when the input signal does not meet its constraints,the output terminal may appear in an“uncertain state”.As for the JK flip-flop circuit,since there are no constraints on the flip-flop characteristic equation,there will be no“uncertain state”at the output.