EE 3235 Electronics II
Term Mini-project
Note: at most 2 members in a team.
1. Introduction
In this term mini-project, you will be designing a realistic circuit using the type of circuits
that we have studied in the course, such as amplifiers, filters, comparators, wave-shaping
circuits etc.
2. Project description
Three project options are given as follows. However, you are strongly encouraged to
explore your own project design idea, such as control signal generation using 555 timers
for special applications, etc. However, in that case please talk to me before you work on
it.
(1) Sound editing using a 3 to 6 band equalizer using bandpass filters
There are no specific technical requirements on this topic, however you do need to
demonstrate your design in the lab using any devices (such as an IPOD or any phone) as
sound/speech/song inputs and deliver the outputs to an speaker, so that we can actually
hear the resulting outputs.
Depending on your board space, you can design a 3-band equalizer instead of a 6-band
equalizer.
(2). A prototype 4-wave functional generator
We have been using the functional generator throughout all lab experiments. In this
project, you need to design a simple functional generator that can generates four types of
waveforms, sin wave, square wave, triangular wave and sawtooth wave.
For the project, the required performance specifications are:
(1) The circuit should be able to generate the 4 types of waveforms with adjustable
amplitude and adjustable frequency (typically by adjusting the resistor) as long as
the waveform is not limited by the OpAmp specifications, like slew rate and
bandwidth.
(2) Use a switch at the output so that you can select the type of the waveform as the
regular functional generator
Hint: use the circuits that we have discussed in the class for this project.
Note: for the sawtooth waveform, the falling edge does not have to be precisely vertical,
e.g. decreasing from a finite positive voltage to a negative voltage immediately. But of
course it should be decreasing much faster than increasing.
(3). A precision AC-to-DC converter
The precision AC-to-DC converter needs to convert an analog input, for instance a sin
wave, to a stable DC output. It is very useful in control and automotive electronics. To
help you understand the design approach, read the material in the book between page 855
and 864 and take it as a reference.
For the project, the required performance specifications are:
(1) Input signal:
70.7/-70.7mV peak-to-peak sinwave of 60Hz
(2) Output voltage:
5V (steady state value)
(3) Output voltage error: less than 0.2% (0.01V)
(4) Rise time of output:
less than 0.02s
(5) Overshoot of output:
less than 5% (0.25V)
3. Procedure
It is suggested that you follow the following two steps to design your project.
(1) design your circuits in Cadence environment and simulate it to make sure that you
realize the performance specifications (see next section)
(2) after it is verified in Cadence, wire-up your circuit in the board, record the
measurements and waveforms, and finally compare with the results you obtained
from Cadence simulation
4. Submission and Grading
This projects count 15 points (15%) of your final grade. The deadline for this project is
4pm, Dec 10th to TA. You should
show the wired circuit in the board, output waveform, measurements or the
demonstration to TA
Project will be graded based on whether your design demonstrates the desired
functionality and meets the performance specifications. There will be point deductions
for each functionality, specification or performance failure. Note that a final project
report is NOT required.