VBE multiplier of Problem 4.100 is put to use in the push-pull circuit of Fig. P4.101. (a)If Is1 5 Is2 5 4Is3 and I1 5 I2 5 I, obtain an expression for the quiescent current IQ of the Q1-Q2 pair as a...

VBE multiplier of Problem 4.100 is put to use in the push-pull circuit of Fig. P4.101.

(a)If Is1 5 Is2 5 4Is3 and I1 5 I2 5 I, obtain an expression for the quiescent current IQ of the Q1-Q2 pair as a function of I, Is3, and the ratio R1yR2 (to simplify your analysis, neglect all base currents as well as the portion of I fl owing through the R1-R2 pair). (b) If I 5 200 A and Is3 5 1 fA, specify the R1yR2 ratio for IQ 5 50 A. (c) Find vI so that vO 5 0. (d) Given that Is3 is a strong function of temperature, fi nd the R1yR2 ratio that will render IQ independent of Is3. What is the new value of IQ for this R1yR2 ratio? What is the new value of vI that will yield vO 5 0?