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Electronic System Design Wireless 1 Presentation. Dec 7 th , 2000. Objective Group Designations Timeline System Overview USB Interface Robert TRF6900 Transceiver Robert Antenna Jimmy Testing Imran Packaging Jason Summary & Conclusions Clay Demonstration. Overview.

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Electronic system design wireless 1 presentation

Electronic System DesignWireless 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

Overview


Objective

PC 1

PC 2

Communication

System

Communication

System

Objective

  • Wireless Communication B/W PC1 & PC2 via USB Port


Group designation

EVM Group

USB Group

Antenna Group

Testing Group

Packaging Group

Operation of

TRF6900

USB Interface b/w

PC & TRF6900

Antenna for

Transmission

Test Plan

&

Hardware Issues

Package for Final

Product

Group Designation

Wireless Group 1


System overview

USB

Port

EZ-USB

Parallel

Out

Antenna Group

USB Group

Testing Group

Antenna

RX_DATA

Filtering

Circuit

Parallel

Port

TRF6900

Mechanical

Antenna

Switch

EVM Group

System Overview

Packaging Group


Usb interface software group

USB Interface & Software Group

Group Leader

Robert Dickerson

Group Members

Clay Ayers

Asad Khan


Ti software

  • Parallel port problems

TI Software

  • Inability to cancel a diagnostic test pattern

  • Lacked the ability to be used with the USBSIMM



Improved ti software1

“Improved” TI Software

  • 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



Instantsquawker1

InstantSquawker

  • 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


Usb firmware1

USB Firmware

  • Data packets to send over the RF link

  • PC request to read the IN buffer

  • Serial port TX/RX


Evm group presentation

EVM Group Presentation

Group Leader: Imran Bashir

Members:

Jeff Allen, Asad Khan, Fakhri Sadeh, Wendy Johnston, Jason Benavidez

Dec 7th, 2000


Overview1

TRF6900 Transceiver

Transmitter

Receiver

General Specifications

Why TRF6900?

Overview



Transmitter

LOCKDET

Data

Serial Interface

Direct Digital Synthesizer (DDS)

2nd Order

Loop Filter

PLL

VCO Tank Circuit

Clock

Strobe

STDBY

Mode

VCO

Crystal Oscillator

TX_DATA

Antenna

Power

Amplifier

Amplifier

Amplifier

Filter / Impedance Matching

Transmitter


Receiver

Antenna

IF Amplifier (1)

RF Amplifier

Pre-Select Filter

LNA

Impedance Matching

BPF (1)

BPF (1)

Carrier

RSSI

(OOK/ASK)

LPF Amplifier/

Post Detection

Amplifier

IF Amplifier (2)

Data Slicer

Data Switch

FM / FSK Demodulator

RX_DATA

Tank Circuit

Capacitor for VREF

External Circuit for LPF

Receiver


Specifications trf6900

Parameter Name

TRF6900

Frequency (MHz)

850-950

Standard Supported

FSK, narrow-band FM

Power Output (dBm)

5

Operating Voltage (Volts)

2.2 – 3.6

Standby Current (A)

2

Package

48-pin PQFP

SpecificationsTRF6900


Why trf6900
Why TRF6900?

  • Availability

  • Donation from Texas Instruments

  • Suitable for the Project’s Objective

  • Availability of Reference Material & Technical Support


Antenna design group

ANTENNA DESIGN GROUP

James Furse

Aden Wilson


Objectives antenna design
Objectives – Antenna Design

  • Compact Design

  • Center Frequency of 915 MHz

  • Low VSWR

  • High Gain

  • Circular Polarization


Objectives rx tx switching
Objectives – RX/TX Switching

  • Low Insertion Loss

  • Fast Switching Speed

  • TTL Level Input


Antenna design scheme
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


Experimental modifications
Experimental Modifications

  • Increased ground plane area

  • Increased pitch angle

  • Varied helix diameter

  • Varied number of helix turns

  • Implemented shunt feed configuration





Milestones
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


Nmha operation
NMHA Operation

  • Normal Mode

  • Self Resonance

  • Direction of Maximum Radiation

  • Elliptical Polarization

  • Ideal E-Plane Radiation Pattern




Antenna specifications
Antenna Specifications

  • Turns  5

  • Diameter  .3125

  • Spacing  .48 

  • Pitch Angle  26

  • Helix Length  2.4 

  • Shunt Feed Configuration









Testing group presentation

Testing Group Presentation

Group Leader: Imran Bashir

Members:

Jeffery Allen, Asad Khan, Fakhri Sadeh, Farhan Khan

Dec 7th, 2000


Overview2
Overview

  • Test Setup

  • Software Issues

    • Speed

    • RSSI

  • Hardware Issue

    • RX_DATA

    • Solution

      • Design 1

      • Design 2

    • Final Circuit


Test setup

O’scope

OR

Logic Analyzer

O’scope

OR

Logic Analyzer

Parallel

Out

EZ-USB

USB

Port

TX_DATA

RX_DATA

USB

Port

EZ-USB

Parallel

Out

Duplexer

Duplexer

TRF6900 EVM

TRF6900 EVM

DB25 female

To DB25 male

DB25 female

To DB25 male

D.C. Power

Supply

8 V

PC (RX)

PC (TX)

8 V

Running

TRF6900.exe

Ver. Beta3

Running

TRF6900.exe

Ver. Beta 3

Test Setup


Software issues
Software Issues

  • Speed

    • Modified Software for Faster PCs

  • RSSI

    • Very Weak Signal from TRF6900

    • Turn RSSI “ON” in Software


Hardware issues noise issue

Voltage Spikes

Hardware IssuesNoise Issue

  • Spikes on RX_DATA During FSK Test


Hardware issues noise issue1
Hardware IssuesNoise Issue

  • Noise on RX_DATA After FSK Test


Hardware issues noise issue solution

Vcc

Input A

Input B

GND

Input A

Input B

Output

Hardware IssuesNoise Issue: Solution


Hardware issues noise issue solution1
Hardware IssuesNoise Issue: Solution

  • 1st Design

TLV3402 Analog Comparator


Hardware issues noise issue solution2
Hardware IssuesNoise Issue: Solution

  • Problem:

    • RSSI Signal is High After FSK Test

During FSK Test

After FSK Test


Hardware issues noise issue solution3
Hardware IssuesNoise Issue: Solution

  • 2nd Design

  • Cleans Spikes in RX_DATA

  • High Output After FSK Test


Packaging group
Packaging Group

Group Leader

Jason Benavidez

Group Members

Wendy Johnston

Jeff Allen


Group objectives
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



Initial packaging design block diagram

OSCILLOSCOPE CONNECTIONS TO BOARD

POWER CONNECTIONS

USB PORT

USBSIMM

EVM BOARD

PWR SWITCH

PWR (adapter)

IN

SMA CONNECTORS TO RX/TX

PARALLEL PORT

Yellow represents future upgrades

Initial Packaging DesignBlock Diagram


Initial design features
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





Final packaging design block diagram

PWR

IN

28 V

EVM BOARD

ANTENNA SWITCH

PWR SWITCH

PWR

IN

10-12 V

VOLTAGE REGULATOR

8 V

USB PORT

P

A

RALLEL

P

O

R

T

POT

LOGIC CIRCUIT

VOLTAGE REGULATOR

5 V

USBSIMM

Final Packaging DesignBlock Diagram


Final design features
Final Design Features

  • USB Data Input Capability

  • Lighted On/Off Switch

  • Impact Resistant Polystyrene Box

  • Internalized Antenna






Supporters
Supporters

  • Texas Instruments

  • Mousers Electronics