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EE311-2009THE12

# EE311-2009THE12 - EE 311 Analog Electronics Take Home Exam...

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1 t -V V v I T 2 -T 2 v s + V CC +12V R L 10 - V CC -12V v O Q 2 Q 1 EE 311 Analog Electronics Take Home Exam Part 12 Due: January 13, 2010 (Optional) Power Amplifiers and Stability (Solve Q1, Q2 and one from Q3, Q4, or Q5) Q1) Consider the following differential amplifier whose output is connected to an output stage to drive a load resistance R L . For all transistors V TN = 1 volt and λ = 0 V -1 . The transistors M 1 and M 2 are identical. The current I 0 = 0.5 mA. The gain factors of the transistors: K 1 = K 2 = 2 mA/V 2 , K 3 = 10 mA/V 2 , K 4 = 1 mA/V 2 , K 5 = 4 mA/V 2 a) Determine the currents I 1 and V D1 . b) Determine the value of K 6 such that V LQ = 0 V. c) Determine the limits of v cm =v 1 =v 2 over which the transistors operate properly. For the input voltages: v 1 = 0.5 sin ϖ t volt, and v 2 = -0.5 sin ϖ t volt d) Determine the total voltage v D1 . e) What is the total output voltage v L ? f) What is the type of the output stage? g) Considering the overall circuit, determine the total supply power P S , the load power P L and the efficiency η .

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