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Calculate noise margins and the switching threshold of the inverter. The power supply voltage VDD=3.3V

For CMOS Inverter with following parameters

VTO,n=0.6VμnCOX=60µA/V2(W/L)n=8 VTO,n=0.7VμnCOX=20µA/V2(W/L)n=12

Calculate noise margins and the switching threshold of the inverter. The power supply voltage VDD=3.3V


Subject :- VLSI Design

Topic :- MOSFET Inverters

Difficulty :- Medium

1 Answer
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Given,

VTO,n=0.6V

VTO,p=0.7V

VDD=3.3V

μnCox=60μA/V2

μpCox=20μA/V2

(Wn/Ln)=8

(Wp/Lp)=12


To calculate: Noise Margins

Formula: Noise Margins

NHL=VILVOL

NHH=VOHVIH


VIL=2Vout+VtopVDD+KRVTON1+KR

VIH=Vtop+VDD+KR(2Vout+VTON)1+KR

but, μnCox=60μA/V2,

μpCox=20μA/V2

KR=μnCoxμpCox(Wn/Ln)(Wp/Lp)

=6020812=2

VIL=2Vout0.733+(20.6)1+2

VIL=0.6Vout0.93 ------ …

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