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ECE 335
PROJECT II
Due Nov. 28
ASSIGNMENT:
Design, build, test and simulate a transistor voltage amplifier according to the
specifications given below.
SPECIFICATIONS:
(a) The small signal voltage gain (vo/vi) must be -10  10% at a signal frequency of 10
kHz (midband) with an output signal level of 5 V peak-peak.
(b) The power supply voltage is to be +15 V DC and maximum quiescent power supply
current is less than 5 mA. The output signal as observed on the oscilloscope must show
no evidence of severe distortion (clipping) when the output signal level across 10 k load
resistor is 5 V peak-peak. Obtain the oscillographs to submit in the report.
(c) The only capacitors allowed are the power supply decoupling capacitor and the input
and output coupling capacitors.
(d) Characterize the BJT to obtain SPICE parameters BF, VA, and IS for your transistor.
Refer to the Lab Book Lab 5 (p.35). Only one type of BJT characterization is needed,
either npn or pnp. You can choose your BJT. Attach to the report the TA check-off sheet
for Lab 5.
(e) Perform SPICE simulation to obtain the Q-point of the BJT and run transient
simulation to obtain output voltage waveform using a sinusoidal input waveform. Use
AC analysis to verify the midband voltage gain when the output signal is 5V peak-peak at
10 kHz. Also, obtain the maximum output voltage swing without clipping.
(f) The report should be submitted along with the circuit pictures. Experimental
measurements should be supported by design calculations. SPICE outputs of transient
and AC analyses must be included in the report (in the main body of the report). A
summary of SPICE results must be included in the report. The report should also include
a complete circuit diagram of amplifier and give all component values.
(g)The report format should be similar to IEEE Transaction style. The page limit is 6
pages. The grading of the report will be based on the technical content as well as the
writing and organization of the report.
Project II
STUDENT'S NAME __________________________________________________
T.A.'s NAME ____________________________ DATE ____________________
CHECK-OFF PROCEDURE:
1.
Apply a 0.5 V peak-peak, 10 kHz sine wave to the amplifier input and measure the voltage gain
with the power supply at + 15 V DC.
Gain = __________________
2.
Increase the input signal amplitude and measure the maximum symmetrical signal swing at the
output without noticeable clipping or distortion using a power supply of + 15 V DC.
Maximum Symmetrical Output Swing (peak-peak) = ________________________________
3.
Remove the input signal and measure the current drawn by the circuit from the +15 VDC power
supply.
Current = _______________________
4.
Verify how many capacitors are used in the amplifier circuit.