Download Distributed Voltage Controlled Oscillator

Distributed Voltage Controlled
Oscillator
Team Members:
Dane Stivers
Todd Beyer
Tim MacShane Monica Studnicki
Advisor:
Dr. Prasad N. Shastry
Funded By:
Electrical Engineering Dept..
Bradley University
Peoria, IL, 61625
Outline of Presentation
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Project Summary
Previous Work Done
Standards Applicable
Top Level Design
Functional Description
Division of Labor
Image of Tunable Bandpass Filter
Image of Distributed Amplifier
Specifications
Components List
Equipment List
Facilities Used
Software Used
Proposed Schedule
Project Summary
• Oscillators are one of the important components in communication
systems. They establish transmitter carrier frequency, and drive
frequency converters. There are several types of oscillators that are
used in commercial and military systems. VCO’s that are tunable to
one octave frequency range are available commercially.
• It is well known that a distributed amplifier provides very wide
bandwidth and high gain. Our design of a VCO will incorporate the
distributed amplifier in order to allow a tunable frequency of close to
one decade frequency (limited by the transistors). This design
approach has never been successfully implemented before.
Previous Work Done
• Patents Held:
– None Found
• Masters Thesis Work:
– Sunil Modur Nagabhushana
• Graduate Level Work:
– Yongqiang He
Standards Applicable
• ISM frequency band:
– Defined by FCC for general unregulated use:
• CFR 47 Part 2 -Frequency Allocations
• Standards and Procedures for Microstrip layout and
Fabrication:
– Variable based upon the fabrication facility
• Safety
– General usage as per ISM band regulations
Top Level Design
Tuning
Voltage
DC Bias
Tunable
Bandpass Filter
Amplifier
Distributed
Amplifier
Power
Divider
DC Bias
VCO Output
Functional Description
Subsystem
Inputs From
Output To
Tunable Bandpass
Filter
Tuning Voltage
Amplifier
Distributed Amplifier
Distributed Amplifier
DC Bias
Bandpass Filter
Power Divider
Power Divider
Distributed Amplifier
Amplifier
Overall System Output
Amplifier
DC Bias
Power Divider
Tunable Bandpass Filter
Division of Labor
Dane Stivers and
Monica Studnicki
Todd Beyer and
Tim MacShane
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Distributed Amplifier
Power Divider
Tunable Bandpass Filter
Amplifier
Specifications
• Output Frequency Range:
1 to 3 GHz
– Design to be tested by operation within the ISM (Industrial,
Scientific, Medical) band
• Output Power:
• Output Impedance
• Tuning Voltage:
• Biasing Voltage:
Stable over whole
frequency range
50
0 to 20 V
15 V DC
Components List
 (10 – 12) Discrete Transistors w/ a similar non-linear model as the
NE76084S.
 Power Divider (PS-2-4000F Wide Band Two Way
Combiner/Divider).
 (20) Coilcraft 22nH Inductors (0603CS-22NX-BC).
 (8-12) Dielectric Laboratories 2400pF DC Blocking Capacitors.
 (4) Varactor Diode that has similar operating limits as the MA
46457-186
 (4) Broadband Amplifier (EIC-1019 Broadband Amplifier)
 (4) High Frequency Circuit Boards
 RO3003 and TMM10i
 (12-20) Microstrip Board to Coax Connectors (50 )
 (5) Microstrip Box Mount Coax Connectors (50 )
 Metal Casing for Final Design
Equipment List
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Spectrum Analyzer
Network Analyzer
Soldering Iron
Voltage Sources
Facilities Used
– The Prototype and Subsystems will be fabricated by us using the
fabrication lab on campus.
– Bradley University’s machine shop will be utilized for the making
if the metal box that the final design will go into.
– Also, the final design will be sent outside to a manufacturer (to be
determined) to be professionally made.
Software Usage
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HP ADS
Mstrip
MATCH
CAMAD
Proposed Schedule
• Week 1:
– Verify Receipt of Components
– Continue Simulations
• Week 2:
– Verify Components
– Continue Simulations
• Week 3:
– Complete Verification of Components
– Start Construction of Subsystems
• Weeks 4-9:
– Continued Construction of Subsystems
– Test Subsystems
– Test Interconnected Functionality
Proposed Schedule (Continued)
• Week 10:
– Construct Prototype
• Week 11:
– Test Prototype
• Weeks 12-14:
– Trouble Shooting
– Preparation for Expo
– Preparation of Final Report