lect 6 - CMOS INVERTER The CMOS Inverter: VDD Vin Vout CL...

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CMOS INVERTER
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The CMOS Inverter: V DD V in V out C L
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It consists of an enhancement-type nMOS transistor and an enhancement type pMOS transistor. Push-pull arrangement -for high input, nMOS pulls down the output node while pMOS acts as load -for low input pMOS pulls up the output node while the nMOS acts as the load.
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The steady state power consumption of the CMOS inverter is negligible. The voltage transfer characteristic exhibit full output swing between o and V DD VTC is a sharp one
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CIRCUIT OPERATION V DD Both the transistors driven directly by the input signal. Substrate of nMOS connected to ground while substrate of pMOS connected to V DD . V in V out
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PMOS Load Lines V out I Dn V in = V DD -V GSp I Dn = - I Dp V out = V DD -V DSp V DSp I Dp V GSp =-5 V GSp =-2 V DSp I Dn V in =0 V in =3 V out I Dn V in =0 V in =3 V in = V DD -V GSp I Dn = - I Dp V out = V DD -V DSp
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From the circuit V GS , n = V in V DS,n = V out V GS,p = - ( V DD -V in ) V DS,p = -(V DD -V out ) V DD V in V out C L
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When the input voltage is smaller than the nMOS threshold voltage I.e., when V in < V TO, n nMOS cut-off and pMOS on
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lect 6 - CMOS INVERTER The CMOS Inverter: VDD Vin Vout CL...

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