4:1 Multiplexer using Transmission Gate logic-
Truth table and circuit diagram-
Operation-
When S0=0, S0=0 then TG1 & TG2 transistor will be ON and current I0 will be transmitted to output through TG1 & TG2.
When S1=0, S0=1 then TG3 & TG4 transistor will be ON and current I1 will be transmitted to output through TG3 & TG4.
When S1=1, S0=0 then TG5 & TG6 transistor will be ON and current I2 will be transmitted to output through TG5 & TG6.
When S1=1, S0=1 then TG7 & TG8 transistor will be ON and current I3 will be transmitted to output through TG7 & TG8.
4:1 multiplexer using minimum Transmission Gates(6 Transmission gates) -
Truth table and circuit diagram-
Operation-
When S1=0, S0=0 then TG1 & TG3 transistor will be ON and current I0 will be transmitted to output through TG1 & TG3.
When S1=0, S0=1 then TG2 & TG3 transistor will be ON and current I1 will be transmitted to output through TG2 & TG3.
When S1=1, S0=0 then TG4 & TG6 transistor will be ON and current I2 will be transmitted to output through TG4 & TG6.
When S1=1, S0=1 then TG5 & TG6 transistor will be ON and current I3 will be transmitted to output through TG5 & TG6.
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4:1 Multiplexer using Pass transistor logic-
Truth table and circuit diagram-
Operation-
When S1=0, S0=0 then M1 & M2 transistor will be ON and current I0 will be transmitted to output through M1 & M2.
When S1=0, S0=1 then M3 & M4 transistor will be ON and current I1 will be transmitted to output through M3 & M4.
When S1=1, S0=0 then M5 & M6 transistor will be ON and current I2 will be transmitted to output through M5 & M6.
When S1=1, S0=1 then M7 & M8 transistor will be ON and current I3 will be transmitted to output through M7 & M8.
4:1 multiplexer using minimum Pass Transistor(6 pass transistor) -
Circuit diagram-
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