1. Electronic System Design Wireless 1 Presentation
Dec 7th, 2000

2. Overview Objective Group Designations Timeline System Overview
USB Interface Robert
TRF6900 Transceiver Robert
Antenna Jimmy
Testing Imran
Packaging Jason
Summary & Conclusions Clay
Demonstration
Dec7th 2000

3. Objective Wireless Communication B/W PC1 & PC2 via USB Port PC 1 PC 2
System
PC 1
PC 2
Wireless Communication B/W PC1 & PC2 via USB Port
Dec7th 2000

4. Group Designation Wireless Group 1 EVM Group USB Group Antenna Group
Testing Group
Packaging Group
Operation of
TRF6900
Package for Final
Product
Test Plan
&
Hardware Issues
Antenna for
Transmission
USB Interface b/w
PC & TRF6900
Dec7th 2000

5. System Overview Packaging Group USB Group Antenna Group Testing Group
EZ-USB
Parallel
Out
USB
Port
USB Group
Mechanical
Antenna
Switch
Antenna Group
RX_DATA
Filtering
Circuit
Testing Group
Parallel
Port
TRF6900
EVM Group
Dec7th 2000

6. USB Interface & Software Group
Group Leader
Robert Dickerson
Group Members
Clay Ayers
Asad Khan

7. TI Software Used to diagnose and setup the TRF6900
Parallel port problems
Inability to cancel a diagnostic test pattern
Lacked the ability to be used with the USBSIMM

8. “Improved” TI Software

9. “Improved” TI Software
Will program the TRF6900 with the parallel port
Automatically selects USBSIMM when connected
Option to reset settings to default when switching between TX/RX modes
Changed frequency error adjustment to amount of error in the signal
Non-integer testing durations

10. InstantSquawker

11. InstantSquawker Chat program with file transfer capabilities
Uses a basic protocol between itself and the USBSIMM board
Automatically detects and interfaces with the USBSIMM module and programs the TRF6900 on connection

12. USB Firmware Starting Point Initialize USBSIMM
Reset and Disable TRF6900
Do Nothing in Main Loop

13. USB Firmware Setup packets from the PC
Data packets to send over the RF link
PC request to read the IN buffer
Serial port TX/RX

14. EVM Group Presentation
Group Leader: Imran Bashir
Members:
Jeff Allen, Asad Khan, Fakhri Sadeh, Wendy Johnston, Jason Benavidez
Dec 7th, 2000

15. Overview TRF6900 Transceiver Transmitter Receiver
General Specifications
Why TRF6900?
Dec7th 2000

16. TRF6900 Transceiver
Dec7th 2000

17. Transmitter Serial Interface Data Clock Strobe
Direct Digital Synthesizer (DDS)
Crystal Oscillator
PLL
VCO Tank Circuit
Filter / Impedance Matching
LOCKDET
VCO
Antenna
2nd Order
Loop Filter
Amplifier
Power
Mode
STDBY
TX_DATA
Dec7th 2000

18. External Circuit for LPF
Receiver
Impedance Matching
Carrier
Data Slicer
Data Switch
FM / FSK Demodulator
Tank Circuit
External Circuit for LPF
Capacitor for VREF
RX_DATA
LNA
RF Amplifier
RSSI
(OOK/ASK)
Pre-Select Filter
IF Amplifier (1)
IF Amplifier (2)
BPF (1)
LPF Amplifier/
Post Detection
Amplifier
Antenna
Dec7th 2000

19. Specifications TRF6900 TRF6900 Parameter Name 48-pin PQFP Package 2
Standby Current (A)
2.2 – 3.6
Operating Voltage (Volts) 5
Power Output (dBm)
FSK, narrow-band FM
Standard Supported
Frequency (MHz)
TRF6900
Parameter Name
Dec7th 2000

20. Why TRF6900? Availability Donation from Texas Instruments
Suitable for the Project’s Objective
Availability of Reference Material & Technical Support
Dec7th 2000

21. James Furse Aden Wilson
ANTENNA DESIGN GROUP
James Furse
Aden Wilson

22. Objectives – Antenna Design
Compact Design
Center Frequency of 915 MHz
Low VSWR
High Gain
Circular Polarization
Dec7th 2000

23. Objectives – RX/TX Switching
Low Insertion Loss
Fast Switching Speed
TTL Level Input
Dec7th 2000

24. Antenna Design Scheme Initial antenna design and evaluation
Optimize characteristics by varying antenna dimensions and configuration
Perform preliminary tests with network analyzer to determine effects of changes
Implement desirable modifications and perform radiation pattern and gain tests
Dec7th 2000

25. Experimental Modifications
Increased ground plane area
Increased pitch angle
Varied helix diameter
Varied number of helix turns
Implemented shunt feed configuration
Dec7th 2000

26. Equipment Setup for Radiation Pattern And Gain Measurements
Dec7th 2000

27. Anechoic Chamber Setup
Dec7th 2000

28. Network Analyzer and Antenna Rotation Unit
Dec7th 2000

29. Milestones 10/01/00 Select Antenna Design 10/08/00 Complete Prototype
11/15/00 Implement RX/TX Switch
11/20/00 Successful PC to PC Communication
12/05/00 Design Complete
Dec7th 2000

30. NMHA Operation Normal Mode Self Resonance
Direction of Maximum Radiation
Elliptical Polarization
Ideal E-Plane Radiation Pattern
Dec7th 2000

31. Ideal E-Plane Radiation Pattern
Dec7th 2000

32. Final Antenna Design
Dec7th 2000

33. Antenna Specifications
Turns  5
Diameter  
Spacing  .48 
Pitch Angle  26
Helix Length  2.4 
Shunt Feed Configuration
Dec7th 2000

34. Network Analyzer – Return Loss
Dec7th 2000

35. Network Analyzer – Smith Chart
Dec7th 2000

36. Network Analyzer - VSWR
Dec7th 2000

37. Anechoic Chamber Measurements
Dec7th 2000

38. Anechoic Chamber Measurements
Dec7th 2000

39. Anechoic Chamber Measurements
Dec7th 2000

40. RX/TX Switching
Dec7th 2000

41. Testing Group Presentation
Group Leader: Imran Bashir
Members:
Jeffery Allen, Asad Khan, Fakhri Sadeh, Farhan Khan
Dec 7th, 2000

42. Overview Test Setup Software Issues Hardware Issue Speed RSSI RX_DATA
Solution
Design 1
Design 2
Final Circuit
Dec7th 2000

43. Test Setup Duplexer O’scope OR Logic Analyzer PC (RX) Running
8 V
Duplexer
TRF6900 EVM
RX_DATA
O’scope OR
Logic Analyzer
PC (RX)
Running
TRF6900.exe
Ver. Beta3
DB25 female
To DB25 male
EZ-USB
USB
Port
Parallel
Out
TX_DATA
PC (TX)
Ver. Beta 3
D.C. Power
Supply
Dec7th 2000

44. Software Issues Speed RSSI Modified Software for Faster PCs
Very Weak Signal from TRF6900
Turn RSSI “ON” in Software
Dec7th 2000

45. Hardware Issues Noise Issue
Spikes on RX_DATA During FSK Test
Voltage Spikes
Dec7th 2000

46. Hardware Issues Noise Issue
Noise on RX_DATA After FSK Test
Dec7th 2000

47. Hardware Issues Noise Issue: Solution
Vcc
Input A
Input B
GND
Input A
Input B
Output
Dec7th 2000

48. Hardware Issues Noise Issue: Solution
1st Design
TLV3402 Analog Comparator
Dec7th 2000

49. Hardware Issues Noise Issue: Solution
Problem:
RSSI Signal is High After FSK Test
During FSK Test
After FSK Test
Dec7th 2000

50. Hardware Issues Noise Issue: Solution
2nd Design
Cleans Spikes in RX_DATA
High Output After FSK Test
Dec7th 2000

51. Packaging Group Group Leader Group Members Jason Benavidez
Wendy Johnston
Jeff Allen
Dec7th 2000

52. Group Objectives
Packaging the EVM Board, USB SIMM Board, Antenna, and All Related Components for Testing Purposes
Construct Necessary Jumpers and Connections Internal to the Device
Design and Fabricate a Single Package Solution for Final Commercial Product
Dec7th 2000

53. Initial Packaging

54. Initial Packaging Design Block Diagram
EVM BOARD
POWER CONNECTIONS
PARALLEL PORT
SMA CONNECTORS TO RX/TX
OSCILLOSCOPE CONNECTIONS TO BOARD
PWR SWITCH
USBSIMM
USB PORT
PWR (adapter) IN
Yellow represents future upgrades
Dec7th 2000

55. Initial Design Features
Provide Protection & Stability for EVM
Provide Permanent Connections for Power Supply From External DC Power Source
Allow Easy Access to RX/TX Data Terminals for Testing Purposes
Allow Easy Hook up to Testing Equipment
Dec7th 2000

56. Initial Package Design
Dec7th 2000

57. Package Layout
Dec7th 2000

58. Final Packaging

59. Final Packaging Design Block Diagram
EVM BOARD
PWR SWITCH
USBSIMM
USB PORT
PWR IN
10-12 V
ANTENNA SWITCH
POT P A
RALLEL O R T
28 V
LOGIC CIRCUIT
VOLTAGE REGULATOR
5 V
8 V
Dec7th 2000

60. Final Design Features USB Data Input Capability Lighted On/Off Switch
Impact Resistant Polystyrene Box
Internalized Antenna
Dec7th 2000

61. Final Package
Dec7th 2000

62. Final Package
Dec7th 2000

63. Final Package
Dec7th 2000

64. Project Demonstration
Dec7th 2000

65. Supporters
Texas Instruments
Mousers Electronics
Dec7th 2000