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 />
STABLE STATES OF CMOS FLIP-FLOP<br />
• Simplify<strong>in</strong>g assumptions: n n =n p =n, I 0n =I 0p =I 0<br />
• Normalized voltages v k =V k /U T<br />
high <strong>and</strong> low logic states<br />
8<br />
6<br />
4<br />
2<br />
v B<br />
n=1.6<br />
sw<strong>in</strong>g<br />
stable<br />
stable<br />
0 2 4 6<br />
v H (high)<br />
metastable<br />
v L (low)<br />
normalized supply voltage v B<br />
8<br />
CSEM, E. Vittoz, 2003<br />
V i<br />
<strong>in</strong>verter<br />
I p<br />
I n<br />
C<br />
V o<br />
page 20<br />
V B<br />
• bistable for V B > 1.91U T<br />
• 95% sw<strong>in</strong>g for V B = 4U T<br />
V+<br />
V
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