P17311: Radio-IP Hotspot Transceiver

Preliminary Detailed Design

Table of Contents

Team Vision for Preliminary Detailed Design Phase

The plan for this phase of the project was to have schematics and simulations completed for each of the subsystems (Power, USB Hub/Serial, USB Audio and Radio). We had also aimed to identify more risks and revisit customer and engineering requirements based on them. This goal has been achieved. The purchase list was generated and materials required for prototyping were ordered.

Design and Flowcharts



data sheet




Drawings, Schematics, Flow Charts, Simulations

Schematics and simulations for the individual components are shown below.


https://edge.rit.edu/edge/P17311/public/Detailed%20Design%20Documents/Schematics/schematic_power.png https://edge.rit.edu/edge/P17311/public/Detailed%20Design%20Documents/Schematics/schematics_power.png




public/Detailed%20Design%20Documents/Schematics/RFsch.png public/Detailed%20Design%20Documents/Schematics/RFPCB.png public/Detailed%20Design%20Documents/Schematics/RF3D.png

USB Audio


AF Filters (simulations)




USB and Serial Subsystem


Bill of Material (BOM)

The BOM is shown below. As of now we have ordered and received half of the things required for prototyping. The other half will be ordered this week once PCB layouts have been finalized.


PurchasingSpreadsheet BOM Spreadsheet

Test Plans

We plan to test individual components once we build them. We have LEDs at all digital inputs and outputs to assist in signal tracing during troubleshooting. The test plans for each component are outlined below:

Input 12 volts; ensure that 5 volts & 3.3 volts show up on output. Test using a multimeter with active loads/high impedance (or large resistors).

Provide an audio input (e.g. white noise) with bandwidth wider than expected filter bandwidth. Check the audio output with a spectrum analyzer or re-input into computer sound card and perform FFT analysis to verify performance of band-pass filter. Ensure CM108 chip is powered via 5 volts from USB input.

Provide an audio input then observe the RF output with a spectrum analyzer to verify that spurious emissions are kept at a minimum and are within permissible bounds.

Plug in high throughput device into USB port. Plug in usb hub into computer. Actively use USB device. Verify no packet loss. Configure serial device to be loopback, high speed. Send text at high rate of speed through serial interface. Verify no loss of data.

Risk Assessment


Live Document

Plans for next phase


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