Electronic System Design Wireless 1 Presentation Dec 7th, 2000

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

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

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

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

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

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

“Improved” TI Software

“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

InstantSquawker

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

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

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

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

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

TRF6900 Transceiver Dec7th 2000

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

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

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 850-950 Frequency (MHz) TRF6900 Parameter Name Dec7th 2000

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

James Furse Aden Wilson ANTENNA DESIGN GROUP James Furse Aden Wilson

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

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

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

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

Equipment Setup for Radiation Pattern And Gain Measurements Dec7th 2000

Anechoic Chamber Setup Dec7th 2000

Network Analyzer and Antenna Rotation Unit Dec7th 2000

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

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

Ideal E-Plane Radiation Pattern Dec7th 2000

Final Antenna Design Dec7th 2000

Antenna Specifications Turns  5 Diameter  .3125 Spacing  .48  Pitch Angle  26 Helix Length  2.4  Shunt Feed Configuration Dec7th 2000

Network Analyzer – Return Loss Dec7th 2000

Network Analyzer – Smith Chart Dec7th 2000

Network Analyzer - VSWR Dec7th 2000

Anechoic Chamber Measurements Dec7th 2000

Anechoic Chamber Measurements Dec7th 2000

Anechoic Chamber Measurements Dec7th 2000

RX/TX Switching Dec7th 2000

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

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

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

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

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

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

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

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

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

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

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

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

Initial Packaging

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

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

Initial Package Design Dec7th 2000

Package Layout Dec7th 2000

Final Packaging

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

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

Final Package Dec7th 2000

Final Package Dec7th 2000

Final Package Dec7th 2000

Project Demonstration Dec7th 2000

Supporters Texas Instruments Mousers Electronics Dec7th 2000