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This style of 2-way mux has the smallest dimensions, although not the fastest speed. For fastest speed, the output should be driven through an inverter followed by a transfer gate. However, inserting the metal wire to join the P and N transistors of the inverters makes the cell wider (connecting n2 to n4 and n1 to n3 in the schematics below, and making sure that the transistors closest to the supply are connected to s or sn). The cells here use a P:N ratio of 2. |