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Homework Example Format - ECE3042Spring2009 HomeworkNo.1...

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ECE 3042 Spring 2009 Homework No. 1 Due Week of January 19 Section L01, T12 3 Tom Brewer GTID 987654321 GTNUM: gt54321
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ECE 3042 Homework Assignment No. 1 Fall 2008 Homework Problem Set for Experiment No. 1 Due Week of September 1 1. Shown below is a single stage common emitter amplifier using an 2N3904 NPN BJT as the active device. Design the circuit so that it clips symmetrically, viz. pick R B 1 and R B 2 so that the collector current is that which yields symmetric clipping. The design specification for the magnitude of the small signal midband voltage gain is 25 . For the design calculations assume the the base-to-emitter dc voltage drop is 0 . 65 V, that the current in R B 1 is 9 I B , β = 416 , the base spreading resistance is 10 , and the Early voltage is infinity. 2. For the circuit parameters indicated in the diagram, use both Cadence and National Instruments SPICE to determine: the dc operating point of the circuit, viz. the dc voltage at each terminal of the transistor and the current flowing into the collector and base leads and out of the emitter. the small signal ac voltage gain, viz. a plot of the gain, A v versus frequency where the frequency range is from 10Hz to 100MHz . the positive and negative clipping levels, viz. the maximum and minimum possible values of the output voltage, v o . plot of the output voltage versus time for 2 cycles of the input for an input signal a sine wave with a frequency of 1 kHz and a peak value 0 . 7V . plot of the output voltage versus frequency for a frequency span from dc to 10kHz , viz. the spectra of the output with an input signal a sine wave with a frequency of 1 kHz and a peak value 0 . . Plot the output voltage on a log scale.
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Homework Example Format - ECE3042Spring2009 HomeworkNo.1...

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