数字IC面试题

Question D1): You can use just a NAND gate, How many ways can you come up withan inverter ?

先列出真值表：

即可以将A、B输入相连或者将其中一个输入置为高电平；

Question D2): Make an INVERTER using only 2 input NOR gates

Question D3): Make an OR gate, using just NOR gates.

利用摩根定理：

所以只需要再添加非门就可以实现，如下：

Question D4): Make an INVERTER using a 2 to 1 MUX

对于二选一数据选择器：

所以：

Question D5): Make an AND gate using 2 to 1 MUX

Question D6): Make a NAND gate using 2 to 1 MUX
首先列出与非门的真值表，对比二选一数据选择器：

二选一数据选择器有3个输入端口，包括一个数据选择端口和两个数据输入端口，首先将A确定为数据选择端口，然后将B置为数据输入端口，求出在A=0和A=1的情况下，L与数据输入的关系.

Question D7): Make an OR gate using 2 to 1 MUX

Question D8): Make an NOR gate using 2 to 1 MUX

Question D9): Make an XOR gate using 2 to 1 MUX

Question D10): Design a full adder with 2-1 mux

Question D11): Simplify logic : MUX with D1 input tied to ground, and inverter at the select input.

Question D12): Form a 2 to 1 MUX using only NAND & inverters.

Question D13): Form a 2 to 1 MUX using only NOR gates & inverters.

Question D17): Simplify equation 

Question D21) Come up with an XOR gate using only 2 input mux and inverter.

Question D22) Design a 4:1 MUX using only 2:1 MUXes ?


画出由MOS门构成的非门、与非门、或非门电路