weak inversion in analog and digital circuits - Lund Institute of ...
weak inversion in analog and digital circuits - Lund Institute of ...
weak inversion in analog and digital circuits - Lund Institute of ...
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Weak <strong><strong>in</strong>version</strong><br />
EFFECT OF ENTERING MODERATE AND STRONG INVERSION<br />
(us<strong>in</strong>g cont<strong>in</strong>uous model <strong>of</strong> I D )<br />
• More voltage sw<strong>in</strong>g needed<br />
to obta<strong>in</strong> I on /I <strong>of</strong>f<br />
• from cont<strong>in</strong>uous current model:<br />
• Degeneration <strong>of</strong> logic states:<br />
• reduction <strong>of</strong> logic sw<strong>in</strong>g<br />
• large <strong>in</strong>crease <strong>of</strong> static current I stat<br />
• loss <strong>of</strong> bistability<br />
• more supply voltage needed.<br />
CSEM, E. Vittoz, 2003<br />
4<br />
3<br />
2<br />
1<br />
∆V GS<br />
nU T<br />
V GS sw<strong>in</strong>g<br />
60<br />
40<br />
20<br />
param.<br />
I on /I <strong>of</strong>f<br />
10 5<br />
10 3<br />
page 28<br />
10<br />
102 101 10-1 1 103 0<br />
"on" <strong>in</strong>v. coeff. IC on<br />
v H<br />
logic<br />
sw<strong>in</strong>g<br />
v L<br />
vB =4<br />
n=1.6<br />
I stat<br />
I S<br />
0<br />
0 1 2 3 4 ICon
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