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FPGA Controlled Amplifier Module
May 06-14 Team Members
Jesse Bartley, CprE Jiwon Lee, EE Michael Hayen, CprE Zhi Gao, EE
Client: Teradyne Corp. Faculty advisor: Dr. Chris Chu
April 25th , 2006
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Presentation Outline
Introductory Materials
Project Activity Description Design Overview Implementation Testing
Resources and Schedules
Closing Materials
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List of Terms and Definitions Bill of Materials – List of Components and their cost DAC – Conversion of a digital signal to an analog sampled signal DC-offset – given signal source does not have the correct 0-
crossing but shifted down or up. FPGA – Field programmable gate arrays, allows us to control
some the circuits automatically Gain – The ratio of the output amplitude to the input amplitude HDL – Hardware Description Language Noise – Undesired interference in signals Spectrum Analyzer – A computer-based tool that analyzes
signals in the frequency domain THD – Total harmonic distortion, the ratio between the powers of
all harmonic frequencies above the fundamental frequency
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Acknowledgement Teradyne Corporation
Jacob Mertz Ramon De La Cruz Steven Miller
Additional Help Jason Boyd Dr. Robert Weber
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Problem statement: To build and test the FPGA controlled Amplifier for
PC based Spectrum Analyzer developed by previous team
Approach: Understand existing design Board assembly and bring-up Make detailed test plan Perform and document tests
Problem Statement & Approach
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Users, Uses & Operating Environment Primary users
Engineers at the Teradyne Corporation Product function
As a pre-amplifier for the signal input to a PC based spectrum analyzer device.
PC based spectrum analyzer was designed by previous phase
Climate-controlled laboratory (low humidity) ESD (Electro Static Discharge)
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Assumptions and Limitations
Assumptions The end product will not be sold to other
companies. The design provided by the previous team is valid. Necessary equipment will be available.
Limitations Equipment must be available on campus The design must meet specifications
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Previous Accomplishments
General Design Untested FPGA code Design Schematic Bill of Materials Partial assembly of board
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Present Accomplishments
Ordered parts and assembled board Researched and verified design Re-vamped FPGA code Made detailed test plans Developed automated tests Identified and resolved board errors
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End Product & Other Deliverables An assembled board Updated design Completed test plans Automated LabVIEW tests Documentation of all activities
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Approaches Considered and one used Approaches considered:
Manual testing and calculation LabVIEW automated testing and Excel calculation
Choice: LabVIEW automated testing Repeatability Self documentation Speed/efficiency Extra research required
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Project Definition Activities
Goals of this project: Research & verify the previous design Meet the specifications Board Assembly Make a detailed test plan Testing Document all processes
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Research Activities
Study previous team’s design Pspice simulation Test methodologies
Noise THD
LabVIEW
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Design Activities
Verification of design DC Offset Correction Operational Amplifier
Tests design DC Offset Correction verification tests Amplifier performance tests
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Circuit Overview
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DAC
Output
Comparator
FPGA
Two-Stage Op-AmpInput
DC correction voltage
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Implementation Activities
Errors on the PCB were fixed New Pspice Simulation was developed Trouble shoot for unexpected oscillation Specifications were adjusted Test strategy was developed according to
Client suggestions
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PCB Board Adjustments
New parts purchased and soldered Pins of voltage regulators switched Pins of op-amps switched Fixed incorrect supply voltage FPGA code fixed
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Unexpected Oscillation
Frequency: 32 – 60MHz Amplitude: 5-10Vpp Potential causes
External Noise Error in assembly Parasitic capacitances Unstable amplifier design
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Unexpected Oscillation
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Cause of Oscillations
External Noise Twisted wires at inputs Tested in alternate location/alternate equipment
Error in assembly Corrected error with voltage regulators in layout All essential parts replaced
Parasitic capacitances PSPICE models also showed oscillations (without capacitors)
Other debugging DC offset correction adjusted Comparator circuit disconnected Both current feedback and voltage feedback amps
Conclusion - Unstable amplifier design
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Pspice Simulation
Developed in Orcad Student 9.1 Purposes
Help determine new specifications Help find new resistor values Help troubleshooting
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PSPICE Model
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PSPICE Simulation
R1 R2 R3 R4
6dB 100 100 221 221
20dB 221 2k 158 4.99k
40dB 10 1k 10k 4.99k
60dB 10 10k 7.15k 20k
New resistors: Maximize the bandwidth Achieve best response flatness
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Changed Specification
DC — 1kHz +/- 5 volts 6, 20, 40, 60 +/- 10 volts 0.5 dB < - 105 dB 1.5 nV/rtHz
> 1kHz - 20 kHz +/- 5 volts 6, 20, 40, 60 +/- 10 volts 0.5 dB < - 95 dB 1.5 nV/rtHz
> 20kHz - 100kHz +/- 2.5 volts 6, 20, 40 +/- 5 volts 0.50 dB < -85 dB 2.5 nV/rtHz
> 100kHz - 1MHz +/- 2.5 volts 6, 20, 40 +/- 5 volts 0.50 dB < - 80 dB 3.5 nV/rtHz
> 1MHz - 10MHz +/- 2.5 volts 6, 20, 40 +/- 5 volts 0.50 dB < - 70 dB 3.5 nV/rtHz
> 10MHz - 20MHz +/- 2.5 volts 6, 20 +/- 5 volts 0.50 dB < -65 dB 3.5 nV/rtHz
> 20MHz - 50MHz +/- 1.0 volts 6, 20 +/- 2.0 volts 1.00 dB < -50 dB 5.0 nV/rtHz
> 50MHz - 100MHz +/- 1.0 volts 6, 20 +/- 2.0 volts 2.10 dB < -40 dB 5.0 nV/rtHz
Input Total
Input Voltage Available Max OutputFreq
Response Harmonic
Frequency RangeGain
Settings Voltage Flatness Distortion Noise
Range (Volts) (dB) (Volts) (dB) (dB) (nV/rtHz)
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Testing
Goal: verify compliance with specifications
Important considerations Documentation Usability Repeatability
Automated Testing LabVIEW Data stored in Excel
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Testing (Cont.)
Tests DC gain test Gain flatness and bandwidth test Total harmonic distortion test Circuit noise test
VHDL code behavior test DAC control test Offset calibration test Offset correction verification test
}}
Amplifier Tests
DC Offset Tests
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Amplifier Tests
DC Gain Test Pure measure of DC gain No AC effects
Gain Flatness and Bandwidth Test AC input across 0-100MHz range Verify flatness is within specification Ensures consistent gain
Total Harmonic Distortion THD = Distortion at multiples of input frequency Performed with spectrum analyzer
Noise Test Ambient noise created by op-amps Also measured by spectrum analyzer
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DC Offset Tests
VHDL Behavior Test Tests just behavior of algorithm Simulated on PC in ModelSim
DAC Control Test Custom FPGA code Ensures DAC produces correct offsets Performed in circuit
Offset Calibration Artificially inject range of offsets Calibrate for each, verify correction
Offset Correction Verification Test Ensure calibration holds when AC signal is applied Final assurance individual systems work well together
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LabVIEW Code
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Personnel Effort Requirements
May 06-14May 06-14
Task 1 – Problem definition
Task 2 – Research previous phases to understand the designs project
Task 3 – Identify errors and documentation
Task 4 – Test plan design
Task 5 – Assemble board and bring up
Task 6 – LabVIEW development and Testing
Task 7 – Final report and presentation
Personnel Name
Task 1 (hours)
Task 2 (hours)
Task 3 (hours)
Task 4 (hours)
Task 5 (hours)
Task 6 (hours)
Task 7 (hours)
Totals (hours)
Jesse Bartley 20 20 30 35 32 35 17 189
Jiwon Lee 17 16 25 45 15 38 18 174
Michael Hayen 18 18 20 20 27 13 21 137
Zhi Gao 25 28 22 26 36 25 16 178
Totals (hours) 80 82 97 126 110 111 72 678
Personnel Effort
189
174137
178
J esse Bartley
J iwon Lee
Michael Hayen
Zhi Gao
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Financial Requirement
May 06-14May 06-14
Item Without Labor With Labor($11.00/hour)
Components $72.32 $72.32
Project Poster $30 $30
Project Plan $0 $0
Labor at $11.00/hour
oJesse Bartley $0 $2,079
oJiwon Lee $0 $1,914
oMichael Hayen $0 $1,507
oZhi Gao $0 $1,958
Total Cost $102.32 $7,560.32
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Project EvaluationNumber Milestone Importance Progress
1 Understand previous project
High Met
2 FPGA code High Met
3 Assemble board High Met
4 Test plan development High Met
5 Document all progress High Met
6 Identify problems High Met
7 Tests Medium Partially Met
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Project Schedules
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Project Archive Folder
May 06-14May 06-14
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Additional Work Recommended work
Correct design to eliminate oscillations Re-build prototype board accordingly Verify specifications with LabVIEW tests FPGA control of gain Frequency response calibration
Future integration with Spectrum Analyzer Once above recommendations are met
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Commercialization
Recommended additional work required Packaged with PC based spectrum analyzer Price to be determined Potential Market
Small technology companies
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Lessons Learned
Experience gained Documentation methods Team Work Working with an outside client Following schedules Test procedures Test implementation LabVIEW development
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Risk and Management
Unexpected test results Conduct proper trouble shooting
Loss of a team member (Did not encounter) Work cooperatively Good communication Keep updating all processes on the website
Hardware Damage Quick replacement and backup board
Design Problem Identify the problem and suggest for the next phase
Specifications not practical Define new specifications (with client input)
May 06-May 06-1414
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Closing Summary Team’s Accomplishments
Assembled the prototype Developed FPGA code Developed Test plans and LabVIEW programs Documented and organized work Debugged the product and identified problems
Project will make contribution Teradyne PC-Based Spectrum Analyzer Product
The team received the following benefits: Technical knowledge Team work Real industry project
Overall, project benefits both the client and the team
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Questions?
May 06-14May 06-14