5827-exam2-fall07

5827-exam2-fall07 - ECEN4827/5827 _ 1. (this problem was...

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ECEN4827/5827 ___________________________________________________ 1. (this problem was given in an in-class exam) In the CMOS op-amp shown in Fig. 1, the transistor parameters are: NMOS: n C ox = 100 A/V 2 , V tn = 0.5 V, n 0, n 0. PMOS: p C ox = 50 A/V 2 , V tp = 0.5 V, p 0, p 0. A compensation capacitor C c has been added so that the op-amp has an approximately single-pole open-loop transfer function A ( s ) = v o /( v (+) v ( )) over a very wide range of frequencies. Device capacitances can be neglected. At the operating points of interest, all devices are in active/saturation mode. M 1 M 2 M 3 M 4 M 5 M 6 M 9 M 10 2/1 4/1 50/1 50/1 I D 5 V DD = +3.3 V I B 1 A 10/1 4/1 4/1 20/1 v O C c + _ M 7 20/1 M 8 10/1 M 11 100/1 v C M 12 100/1 i D 6 i D 9 i D 2 i D 1 i D 7 I D 12 R out V SS = 3.3 V Figure 1 a) Find the small-signal transconductance parameters g m 1 and g m 11 . What is the output resistance R out of the op-amp? b)
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This note was uploaded on 12/13/2010 for the course ECEN 5827 taught by Professor Staff during the Spring '08 term at Colorado.

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5827-exam2-fall07 - ECEN4827/5827 _ 1. (this problem was...

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