电工电子技术复习资料

4、已知迟滞比较器的传输特性和输入电压波形分别如下图所示,试画出他的输出电压波形。

5、

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(1) 用公式将下列逻辑函数化简为最简与或式,并画出相应逻辑图。

F?AC?BC?B(AC?AC)

(2) 用公式将下列逻辑函数化简为最简与或式。F?ABC?ABC?ABC?ABC (3) 证明:ABC?ABC?ABC?ABC?A 解:(13分)

(1)F?AC?BC?B(AC?AC) (总7分)

F?AC?BC?B(AC?AC)=(A?C)(B?C)?ABC?ABC=AB?C=(A?B)C=AC?BC

(2)

F?ABC?ABC?ABC?ABC(总

3分)

F?ABC?ABC?ABC?ABC=AB?ABC?ABC=AB?ABC?AB?AC=B?AC(3)证明:ABC?ABC?ABC?ABC?A(总3分)

ABC?ABC?ABC?ABC=A(BC?BC)?A(BC?BC)=A(B?C)?A(B?C)=A(B?C)?A(B?C)=A

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