Determine the w/l ratio for mosfet, Electrical Engineering

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Determine the w/l ratio for mosfet

Response to the following problem:

The two-stage CMOS op amp in Fig. is fabricated in a 0.18-μm technology having k1 n = 4k1 p = 400 μA/V2, Vtn -Vtp = 0.4 V.

(a) With A and B grounded, perform a dc design that will result in each of Q1:Q2:Q3:and Q4:conducting a drain current of 100 μA and each of Q6:and Q7:a current of 200 μA. Design so that all transistors operate at 0.2-V overdrive voltages. Specify the W/L ratio required for each MOSFET. Present your results in tabular form. What is the dc voltage at the output (ideally)?

(b) Find the input common-mode range.

(c) Find the allowable range of the output voltage.

(d) With vA = vid/2 and vB =-vid /2, find the voltage gain vo/vid . Assume an Early voltage of 6 V.

267_two-stage CMOS op.jpg

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Electrical Engineering: Determine the w/l ratio for mosfet

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