ELEC 400, Fall 2001
Kozick & Mastascusa
Request for Proposal #1:
Pulse-Width Modulator (PWM)
Date Assigned: Monday, September 3, 2001
Date Due: Monday, September 10, 2001
This request for proposal
(RFP) is for a pulse-width modulator (PWM) for student use in
control systems experiments. The specifications for the PWM are as
follows.
- The PWM will operate at frequencies between 0.05 Hz and 50 Hz.
- The input signal will vary from zero (0) to five (5) volts, and will
control the pulse-width.
- The output signal will be at standard TTL levels and will be capable
of driving a minimum of 5 TTL input circuit loads.
- The operating frequency will be settable with an external control
signal which may be either
- a voltage level (0 to 5 V), or
- a square wave (-5 V to +5) at the desired operating frequency, or
- a pulse signal (0 V to 5 V) at the desired operating frequency.
- The pulse-width will be proportional to the input signal to within
+/- 2%. An input signal of 0 V will produce no pulse, an input
signal of 2.5 V will produce a 50% pulse, and an input signal of 5 V
will produce a constant output signal.
- For the constant output signal, a resetting glitch of no more than
1 msec will be acceptable.
- The device will be safe for students to operate.
Team Management Roles:
Assign the roles of Coordinator, Recorder, and Skeptic to team members
in order from oldest to youngest for this project.
You will rotate these roles in future projects.
Your team may want to refer to the
steps in the engineering design process
as you work on this problem.
Schedule:
On Monday, September 10, each team should come to class with
a written draft of a proposal that describes one or more potential
solutions.
We will discuss your proposals, and then each team will begin
developing a prototype that demonstrates the feasibility of your design.
After evaluating prototypes, teams will design "production models"
that are suitable for use in the control systems lab.
September 21:
Second DRAFT of proposal due.
Thank you and have fun!