What will happen if we swap the transistors of an inverter?
What will happen if we swap the transistors of an inverter?
What will happen if we swap the transistors of an inverter?
Re: What will happen if we swap the transistors of an invert
If we swap the transistors of an inverter that means NMOS will acts as pull-up transistor and PMOS acts as pull-down. So
1. when input is HIGH then PMOS is in cut-off region and NMOS pull-up output to HIGH state. But output voltage will Vtn( i.e threshold voltage for NMOS) less than VDD. NMOS is BAD-1 switch.
2. When input is LOW then NMOS is in cut-off region and PMOS pull-down output to LOW state. But output voltage will Vtp( i.e. threshold voltage for PMOS) high than VSS. PMOS is BAD-0 switch.
So we have less output voltage swing and less noise margins.
Nmh(Noise margin in HIGH state)= Voh-Vih
Mml(Noise margin in LOW state)= Vil-Vol
Voh= Maximum output voltage available in high state
Vih= Minimum input that can be considered as high
Vil= Maximum input voltage that can be considered as low
Vol= Minimum output voltage available in low state
1. when input is HIGH then PMOS is in cut-off region and NMOS pull-up output to HIGH state. But output voltage will Vtn( i.e threshold voltage for NMOS) less than VDD. NMOS is BAD-1 switch.
2. When input is LOW then NMOS is in cut-off region and PMOS pull-down output to LOW state. But output voltage will Vtp( i.e. threshold voltage for PMOS) high than VSS. PMOS is BAD-0 switch.
So we have less output voltage swing and less noise margins.
Nmh(Noise margin in HIGH state)= Voh-Vih
Mml(Noise margin in LOW state)= Vil-Vol
Voh= Maximum output voltage available in high state
Vih= Minimum input that can be considered as high
Vil= Maximum input voltage that can be considered as low
Vol= Minimum output voltage available in low state
Re: What will happen if we swap the transistors of an invert
A BAD BUFFER...thats all!