1. The current mirror on Figure P1.1 uses NPN BJTS Q3 and Q4 with current gains B3 = B4 = B =220. Find the value of the DC current I,

that it produces. Consider the BJT Differential Amplifier (DA) on Figure P1.2. Transistors Q1 and Q2 have current gains B1 = B2 = B = 220. The previous current mirror (the one of Figure P1.1) is used to provide the current IFe = I,, with I, being the current that you found in Question 1 (Problem 1). Let IB,, Ic,, and Ig, be, respectively, the base, collector, and emitter currents of Q,. Moreover,let IB,, Ic,, and Ig, be, respectively, the base, collector, and emitter currents of Q2. DC Analysis: Based on what you found in Problem 1, Question 1, express and compute IB,,Ic, Ig,, IB,, Ic2, and Ig,.a. i.Differential Mode: Express and compute the Differential Mode gain Adm: ii.Common Mode: Express and compute the Common Mode gain Acm: For REE (as you have in your notes) use ro4=va/1p4, with VA =104 V and ID4, = IeE- ii.Compute the Common Mode Rejection Ration (CMRR) is dB.