ECE559_Fall2009_Exam2_Solution

A y l e d r e t r e n v i e n setup time is the

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Unformatted text preview: e is . 2 b c Propagation delay is the time for the value at node A’/B’ to propagate at the output Q that is . l 2 d Exam 2 Solution ECE 559 (Fall 2009), Purdue University Consider the Schmitt trigger circuit shown below. Find the widths of the transistors M3 and M4 to have VM- = 1 V and VM+ = 2 V. Clearly write the of the transistors during your calculation and write your assumptions, if any. : 3 m e l b o r P f n s t n i o o p 0 i t r a e p o o s n o i g r e 3 [ V V 2 2 V A / 6 A / e = 0 0 x C o p = µ 5 . - 0 0 = = 2 . D D V K p 5 1 ’ = 1 x C o n = µ K n ’ n V t V , 5 = 0 . m M L / W V t 0 M p - n = 2 M 3 4 V 6 e - 5 0 = 3 L u o V t n = 1 V i L / W M 2 : n o u i l o t S When we start from Vin = 0, we have Vout = 0 and consequently M3 comes into action. When we start from Vin = VDD, we have Vout = VDD and consequently M4 comes into action. V 5 . 2 = D D V V 5 2 . = D D V u 1 X M V 3 n u V i M 1 M V n o V t 4 o t X M V M M 2 0 2 = D D V V n D i D V 0 = V n Page 7 of 9 i i V Exam 2 Solution ECE 559 (Fall 2009), Pu...
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