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Transcript
ETEE3212 Spring 2006 Test #1 Name:________________________ Show all work. Clearly indicate final answer(s). CHEATSHEET MUST BE TURNED IN WITH TEST OR A ZERO WILL BE RECEIVED FOR ENTIRE TEST! 1. (30 points) Design a CE amplifier using a Darlington transistor pair with a combined β=25000 and VBE=1.2V as shown in the circuit to the right. Use VCC=20V, RE=200Ω, RL=5kΩ, AV= -120V/V and Ai=200A/A. Assume ideal capacitors and determine: a. R1, R2 and Rin b. Maximum undistorted output swing c. Input dc power required 2. (40 points) Design a circuit as shown in the figure to the right for maximum output voltage swing. The transistors Q1 through Q3 each have β=100 while Q4 has a β=200. VBE =0.6V for all transistors and VT=26mV. Assume ideal capacitors and determine: a. RC and CMRR b. Differential mode voltage gain and common mode voltage gain for the total system c. Differential mode input voltage (vdi) for maximum output 3. (30 points) Consider the modified op-amp model with G=105, Ri=1MΩ and RCM=200MΩ. Solve the network of the figure to the right for the resistance Rout. Hint: Draw the model and use the Rout=vtest/itest method. Extra Credit (Maximum 25 points) An emitter resistor amplifier is being designed for the unheated tail section of an aircraft where the temperature ranges from +50oC to -50oC. The battery source is 24V, the transistor selected has a β variation of 300 to 500, and What is the ICBO(25oC)=0.6µA. maximum output voltage swing for a voltage gain of -10V/V if the load is 1kΩ? Let VBE=0.7V and assume ideal capacitors.
