\text { 3. In this circuit, all transistors are matched with } k_{n}=k_{p}=2 \frac{m a}{v^{2}}, V_{t}=0.4 \mathrm{~V} \text { and } V_{A}-a. If VG1 = VG2 = OV, find the dc bias current in each of the four transistors (Q1.2,3.4)as well as the overdrive voltage for each. Ignore the early effect. Also, find the DCvoltage at the sources of Q1 and Q2, as well as, the dc voltages at the gates of Q3and Q4--b. Find the transconductance gm of each Q1 and Q2 and determine the ro of Q3and Q4.-c. If v1 = +Vid/2 and vg2 = -Vid/2, find the differential gain Ad = Vo/Vid-%3D-d. Find the output resistance of the bias current source Q5 (Rss ) and use it todetermine the common mode gain Acm in the case vG1 = VG2 = Vicm and assume thecurrent mirror has error of 1 % in current transfer ratio. Express the CMRR in dB.%3D-e. If it is required to raise the CMRR by 6 dB, by what factor should the channellength of Q5 be changed?

Signals And Systems(Electronics and Communication Engineering)

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