3220 Final Exam summer 2001

# 3220 Final Exam summer 2001 - Name EE3220FinalExam SSN...

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Name:_______________________________ EE 3220 Final Exam SSN: ________________                                            Summer 2001 1. Find the bias voltages V C  and V E  and the bias values of I C  and V CE  for the BJT.  V CC  = 10 volts   V EE  = -10 volts R 1  = 50 k R 2  = 10 k R C  = 5 k R E  = 1 k β  is not known but it is large. 2. Determine the oscillation frequency for the Schmitt-Trigger Oscillator below.  Accurately plot  the output signal and two signals on the inputs of the op-amp (v + , v - ).  These will be plots of  voltage as a function of time.  What is the duty cycle for this op-amp clock?

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3. Find the high frequency cutoff frequency for the BJT circuit below.  BJT parameters:   C μ  = 0,  r x  = 10, f T  = 450 MHz β F = o  = 100  V f  = 0.7  V,  η  = 1, and  r o   =   .     Biasing analysis yields an  I  = 1 mA. V CC  = 6 volts   V EE  = -6 volts R 1  = 20 k R 2  = 10 k R C  = 5 k R E  = 3.3 k C E  = 100  μ F R M  = 1 M C M  = 4 pF R S  = 1 k C S  = 2.2  μ F
4. The CMOS logic inverter is made with

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3220 Final Exam summer 2001 - Name EE3220FinalExam SSN...

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