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Robert Gibb Dominic Emilian Seth Berggren Patrick Coletti

Robert Gibb Dominic Emilian Seth Berggren Patrick Coletti. Motivation. Current digital cable systems: Long, clumsy coax cable laid out throughout walls of the house are unsightly and difficult to route around your house Broken coax can be difficult to replace

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Robert Gibb Dominic Emilian Seth Berggren Patrick Coletti

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  1. Robert Gibb Dominic Emilian Seth Berggren Patrick Coletti

  2. Motivation • Current digital cable systems: • Long, clumsy coax cable laid out throughout walls of the house are unsightly and difficult to route around your house • Broken coax can be difficult to replace • Splitting of coax cable requires additional wires • Awkward jack placement • One receiver box per TV

  3. Requirements Specification • Cost: Under $200 (mass produced) • Size: Transmitter box should be 8x6x2 or smaller. Receiver will be small enough to plug right into back of TV. • Easy : Omni-directionally transition, simple setup, easy to use interface • Multiplicity: transmit separate channels to up to four different TVs. • Security: Password protected user accounts on server, parental control • Legality: YES, OUI, CI • Ability: work at distances up to 150 feet.

  4. System Overview: User Standpoint

  5. System Overview: Hardware Standpoint To Router

  6. Web Server Design • Server hosted on EVK1100 • Web page written in HTML and JavaScript • Accessed via computer or mobile device • Interfaced with microcontroller using C code Web Server

  7. SPI Design: Physical Implementation On Transmitter

  8. SPI Design: Programming • RFICs controlled by programming registers -ADRF6806, MAX2831 • Each RFIC contains 8 registers • Example of register values for ADRF6806 • Atmel provides SPI libraries Web Server Function Call on SPI_Controller() SPI_Controller() • channelToFrequencyOffset() • frequencyOffsetToByte() SPI_SendToSlave() To Slave SPI_Drivers

  9. DATA, CLK, CS; one chip select high per programming cycle Transmitter Implementation: Interfacing

  10. Transmitter

  11. Transmitter: Block Diagram Baseband I/Q 1. RF Cable RF Antenna Out 2. 3. 4. -2400+TV[0:3]offset 2400+TV[0:3]offset -56MHz 56MHz -112MHz 112MHz 2. 1. 3. 4.. MAR-8A+ MAR-8A+

  12. Max2831 recommends 100mVrms = 0dbm at input • Input to ADRF: -55dbm; Need~50-60dB of gain • Mini-Circuits DC-1GHz, 25dB MAR-8A+, 12dB MAR-3+ Transmitter Implementation: Amplifiers

  13. 120 OHM TO GND • MAX2831 accepts voltage swings from .98V-1.33V; 1.2V ideal • ADRF6806: 1.55V-1.75V; centered on 1.65V • Resistors to GND = 120ohm Transmitter Implementation: Leveling Network

  14. 250mA per IC x 8 IC’s = 2A • 12V supplies Amplifiers • Voltage Regulators: 3.3V, 5V, 2.8V Transmitter Implementation: Power

  15. Transmitter: Schematic

  16. Transmitter: PCB

  17. Receiver

  18. Receiver: Block Diagram RF Cable 2. 1. 3. Base Band -56MHz 56MHz RF Antenna In MAX2831 ADL5386 -2400+TV[0:3]offset 2400+TV[0:3]offset VA ∑ LNA VA 2.437 GHz 56 MHz

  19. Receiver Schematic Output to TV Input to Balun SPI 56MHz Crystal In Phase Quadrature PLL / Crystal Oscillator Circuitry

  20. Receiver Challenges • Common-Mode voltage differences • 1.2V (MAX2831) to 500mV (ADL5386) • Variable Voltage Settings • Adjustments to LNA and VA’s on MAX2831 • Adjustments to VVA on ADL5386

  21. PCB Design: Receiver

  22. How much would it cost?

  23. 200 surface mount components on transmitter PCB • 50 components on microcontroller PCB, $30 for parts • 200 surface mount components on receiver PCB • 2- 4 layers boards, 1 2 layer board • Components-$100 QTY. Board Price Unique Parts SMT Mounts Price For One 50 Transmitter $5,582.50 50 300 $111.65 50 Receiver $3,832.50 30 100 $76.65 50 uController $2,315 10 20 $46.30 $234.60 • Estimated Cost: $234.60 Budget

  24. SPI/Web Interface working with each other; Channel Selection via web to microcontroller Analog Circuitry Modulating, demodulating, modulating up and downconverting to software programmed frequencies Hardware and Software working independently Project Deliver-ables

  25. By SDP Day: • Complete system integration • Transmitter PCB in enclosure • Receiver, Microncontroller all contained in enclosures as well SDP Day

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