University of Portland
School of Engineering
5000 N. Willamette Blvd.
Portland, OR 97203-5798
Phone 503 943 7314
Fax 503 943 7316
Functional Specifications
Project Meadowlark: A CMOS Programmable
Digital Low-Pass Filter
Contributors:
Jennifer Galaway
Jennifer Williams
Approvals
Name
Signature file
Dr. Osterberg
UNIVERSITY OF PORTLAND
Date
Date
Name
Signature file
Dr. Lillevik
SCHOOL OF ENGINEERING
Date
Date
CONTACT: J. GALAWAY
FUNCTIONAL SPECIFICATIONS
PROJECT MEADOWLARK
REV. 1.1
PAGE II
Revision History
Rev.
Date
Author
0.5
0.8
0.9
09/1702
09/19/02
9/19/02
J. Galaway & J. Williams
J. Galaway & J. Williams
J. Galaway & J. Williams
1.0
9/28/02
J. Galaway & J. Williams
1.1
11/11/02
J. Galaway & J. Williams
UNIVERSITY OF PORTLAND
SCHOOL OF ENGINEERING
Reason for Changes
Initial draft
Inserted figures and tables
Edited values, inserted
graph
Edited through
suggestions from Mr. Mike
Desmith (Industry Rep)
Edited due to Change
Control Request and
Approval
CONTACT: J. GALAWAY
FUNCTIONAL SPECIFICATIONS
PROJECT MEADOWLARK
REV. 1.1
PAGE III
Table of Contents
Summary....................................................................................................................... 1
Introduction .................................................................................................................. 3
Background .................................................................................................................. 4
Requirements ............................................................................................................... 5
Overview ..................................................................................................................................................5
Physical Specifications............................................................................................................................6
VLSI Chip:.........................................................................................................................................6
Oscilloscope: ....................................................................................................................................6
Function Generator: .........................................................................................................................7
Power Supply: ..................................................................................................................................7
ADC: .................................................................................................................................................7
DAC: .................................................................................................................................................7
Bread Board: ....................................................................................................................................7
Ribbon Cable:...................................................................................................................................7
Cables: ..............................................................................................................................................7
Wire Wrap Sockets: .........................................................................................................................7
Wire:..................................................................................................................................................8
Control Dials: ....................................................................................................................................8
Discrete Logic: ..................................................................................................................................8
Environmental Specifications .................................................................................................................8
Mobility: .............................................................................................................................................8
Temperature: ....................................................................................................................................8
Relative Humidity: ............................................................................................................................9
Shock and Vibration: ........................................................................................................................9
Input/Output Specifications .....................................................................................................................9
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CONTACT: J. GALAWAY
.
.
.
.
Graphic Display: ...............................................................................................................................9
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Frequencies: .................................................................................................................................. 10
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Coefficients: ...................................................................................................................................
10
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FUNCTIONAL SPECIFICATIONS
PROJECT MEADOWLARK
REV. 1.1
PAGE IV
Conclusions ...............................................................................................................11
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CONTACT: J. GALAWAY
FUNCTIONAL SPECIFICATIONS
PROJECT MEADOWLARK
REV. 1.1
PAGE V
List of Figures
Figure 1. Block Diagram of Meadowlark ..................................................................................................5
Figure 2. Typical Low-Pass Filter output Graphical Display …………………………………………10
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FUNCTIONAL SPECIFICATIONS
PROJECT MEADOWLARK
REV. 1.1
PAGE VI
List of Tables
Table 1. Physical Specifications ....................................................................................................................6
Table 2. Environmental Specifications ..........................................................................................................8
Table 3. Input/Output Specifications..............................................................................................................9
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CONTACT: J. GALAWAY
FUNCTIONAL SPECIFICATIONS
PROJECT MEADOWLARK
Chapter
REV. 1.1
PAGE 1
Summary
1
Project Meadowlark is a CMOS Programmable Digital Filter implemented with a VLSI
chip. The project is to be used as a classroom demonstration tool at the University of
Portland. This document covers exclusively the external features of Project Meadowlark.
The internal workings of the project will be examined in a future document.
The final display of Project Meadowlark is depicted on an Oscilloscope in the form of
an analog output signal. The Function Generator generates the original input signal in the
form of sweeping sine waves. This analog signal enters an Analog-to-Digital Converter
(ADC), which outputs an 8-bit digital signal to enter into the digital filter chip. The chip
outputs a low-pass-filtered 8-bit digital signal, which then enters a Digital-to-Analog
Converter (DAC) that converts the signal back into analog form which allows it to be
displayed by the Oscilloscope.
There are three main areas of Functional Specifications in this document: Physical,
Environmental, and Input/Output. Summary tables are provided in the Requirements
section of this document. The Physical Specifications takes into account both the actual
model and a macro model of the chip. The Environmental Specifications consider
temperature, humidity, and shock and vibration issues that may arise. For example, the
device needs to be portable in order to transfer from classroom to classroom, but the less
shock and vibration inflicted on it, the longer the product will maintain its condition. The
Input/Output Specifications looks at the display, operating frequencies, and coefficients
used in the project. Project Meadowlark can be a 1st, 2nd, or 3rd order digital filter,
depending on the selected coefficients of a difference equation. All of these areas and
specifications are subject to change throughout the duration of the project.
In terms of budget, Project Meadowlark will mainly be sponsored through borrowed
equipment from the University of Portland. MOSIS will provide the CMOS VLSI chip.
Tanner LEDIT will be used to design the VLSI chip. The project team as of this point will
UNIVERSITY OF PORTLAND
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CONTACT: J. GALAWAY
FUNCTIONAL SPECIFICATIONS
PROJECT MEADOWLARK
REV. 1.0
PAGE 2
purchase the ADC, DAC, power supply, control dials, wire-wrap sockets, and macro
model discrete logic. It is possible that some of these components could be donated from
a company or borrowed from the University of Portland.
Any further questions or concerns can be raised to Jennifer Galaway, Project
Manager, or Jennifer Williams, Project Team Member.
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FUNCTIONAL SPECIFICATIONS
PROJECT MEADOWLARK
Chapter
REV. 1.1
PAGE 3
Introduction
2
The purpose of this document is to inform primarily the faculty of the University of
Portland of the Functional Specifications of Project Meadowlark. After reading this
document, the reader will know all of the external features of Project Meadowlark, as well
as some background information about the project and any conclusions the project team
has made. The internal features of the project will be discussed in a future document.
The rest of the document will include the following:

Background: This section will describe information needed to understand the
document in its entirety.

Requirements: This piece will be broken down into three major categories:
Physical Specifications, Environmental Specifications, and Input/Output
Specifications.

Conclusions: Provides highlights of key points of the document and states
any conclusions based on information made available in the document.
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FUNCTIONAL SPECIFICATIONS
PROJECT MEADOWLARK
Chapter
REV. 1.1
PAGE 4
Background
3
Project Meadowlark consists of a Programmable Digital Filter implemented with a
CMOS VLSI (very large-scale integration) chip. The chip is provided by MOSIS and is the
most integral part of the final project. If for some reason the file used to create the chip in
Tanner LEDIT, called a tpr file, is faulty in any way, the project will not work as desired or
not at all. A digital filter chip has never been a project at the University of Portland, so
many challenges lie ahead for the team. Once Project Meadowlark is complete, it can be
used in a classroom setting as a demonstration tool. This is the main goal of the project.
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FUNCTIONAL SPECIFICATIONS
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Chapter
REV. 1.1
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Requirements
4
Overview
Figure 1 shows the overall setup of Project Meadowlark. The function generator
sends out an analog signal of sweeping sine waves, which enters an Analog-to-Digital
Converter (ADC). This converts the analog signal into an 8-bit digital signal, which enters
the Digital Filter chip. Other inputs into the chip are three coefficients of a difference
equation. Once the signal is properly filtered, another 8-bit digital signal enters a Digital-toAnalog Converter (DAC), which allows the newly filtered digital signal to be converted
back into an analog signal. The output of the DAC is inputted into the Oscilloscope, and a
graph is shown, depicting the magnitude of the frequency response of the digital filter.
Figure 1. Block Diagram of Meadowlark
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FUNCTIONAL SPECIFICATIONS
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REV. 1.1
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Physical Specifications
Table 1. Physical Specifications contains a list of the physical specifications and their
required values.
Table 1. Physical Specifications
Requirement
VLSI Chip
Oscilloscope
Function Generator
Power Supply
ADC
DAC
Bread Board
Ribbon Cable
Cables
Wire Wrap Sockets
Wire
Control Dials
Discrete Logic
Value
1.5 m CMOS
Technology
MOSIS/AMI
Model: Tektronix
TDS 310 2-channel
oscilloscope, 50
MHz, 200 MS/s
Model: Tektronix
CFG253 3 MHz
5V
To be determined
To be determined
N/A
N/A
N/A
N/A
N/A
N/A
74xx
VLSI Chip:
A 40-pin DIP, provided by the MOSIS MEP program. The design will be done in CAD
using Tanner LEDIT. Dimensions will be either a maximum of 2.2 mm x 2.2 mm, or a
maximum of 4.6 mm x 4.7 mm. The dimensions depend on the size of the chip.
Oscilloscope:
To be used in the University of Portland Engineering building, provided by the University of
Portland.
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FUNCTIONAL SPECIFICATIONS
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Function Generator:
To be used in the University of Portland Engineering building, provided by the University of
Portland.
Power Supply:
A 5V source with a current of about 3A.
ADC:
To be determined until purchase by the project team. Will be an 8-bit ADC.
DAC:
To be determined until purchase by the project team. Will be an 8-bit DAC.
Bread Board:
Possibly salvageable from previous senior design projects, provided by the University of
Portland.
Ribbon Cable:
Possibly salvageable from previous senior design projects, provided by the University of
Portland.
Cables:
Possibly salvageable from previous senior design projects, provided by the University of
Portland.
Wire Wrap Sockets:
To be determined until purchase by the project team.
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FUNCTIONAL SPECIFICATIONS
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Wire:
Provided by the University of Portland.
Control Dials:
To be determined until purchase by the project team.
Discrete Logic:
Used in the macro model of the chip.
Environmental Specifications
Table 2. Environmental Specifications contains a list of the physical specifications and
their required values.
Table 2. Environmental Specifications
Requirement
Value
Mobility
Temperature
Relative Humidity
Shock and Vibration
Portable
Room Temperature
Indoors Only
Minimum
Mobility:
Product needs to be portable enough to be carefully carried and/or rolled on a cart.
Product is designed to be maintenance-free for one year.
Temperature:
Room temperature (65 - 75 F)
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FUNCTIONAL SPECIFICATIONS
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REV. 1.1
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Relative Humidity:
Product designed for indoor use only.
Shock and Vibration:
Keep to a minimum. Product is designed to be portable, but needs to be handled with
care.
Input/Output Specifications
Table 3. Input/Output Specifications contains a list of the input/output specifications and
their required values.
Table 3. Input/Output Specifications
Requirement
Graphic Display
Frequency Range
Coefficients
Value
LPF, 5V Sine wave out
100 Hz – 100 kHz
Selectable
Graphic Display:
Low-pass filter output response, amplitude varies with changes in frequency and
coefficients.
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FUNCTIONAL SPECIFICATIONS
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Figure 2. Typical Low-Pass Filter output Graphical Display.
Frequencies:
Operates between 100 Hz and 100 kHz.
Coefficients:
Three coefficients: C1, C2, and C3; to be determined through more research and testing.
UNIVERSITY OF PORTLAND
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CONTACT: J. GALAWAY
FUNCTIONAL SPECIFICATIONS
PROJECT MEADOWLARK
Chapter
REV. 1.1
PAGE 11
Conclusions
5
The introduction stated that the primary target market of this document is the faculty of
the University of Portland. The project team needs to convince the faculty of the
usefulness of Project Meadowlark, and will do so by providing the faculty as much
information about the project as required.
The background mentioned that the key point in the production of Project Meadowlark
is the correct CAD design of the VLSI chip. Thus the project team will spend a large
portion of the project design time on this issue.
The requirements section mentioned that there are three key specification areas:
Physical, Environmental, and Input/Output. It can be concluded that there is a good
possibility of the project team needing to make some changes throughout the designing of
Project Meadowlark, due to false assumptions/information or unexpected issues that may
arise while building the project.
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