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Explain CMOS inverter characteristics mentioning all regions of operations
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written 5.5 years ago by |
The current equations are given as-
The voltage conditions are given as follows. For this examine the operating modes of nMOS and pMOS as function of input and output voltage.
A typical CMOS inverter voltage transfer characteristic with different operating regions is as shown below.
Region | Vin | Vout | nMOS | pMOS |
---|---|---|---|---|
A | Vin < VT0,n | VOH | Cutoff | Linear |
B | VIL | High ≈ VOH | Saturation | Linear |
C | Vth | Vth | Saturation | Saturation |
D | VIH | Low ≈ VOL | Linear | Saturation |
E | greater than (VDD + VT0,p) | VOL | Linear | Cutoff |