FPGA Function Generator

This uses a Mojo V3 FPGA board with a simple resistive network DAC to make a function generator.

Samuel Comeau

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Description

This uses a Mojo V3 FPGA board from Embedded Micro. By using a simple to make resistive network DAC, it can output almost any waveform that you can code.

Components

1 × Mojo V3 development board This FPGA board can be found on amazon or sparkfun.
1 × Mojo protoboard This is a prototyping shield for the Mojo board
19 × 1K ohm resistor 1/4 W through hole. Alternatively 7 2K and 5 1K
1 × Incremental Rotary Encoder (optional) I use a 20-detent, but the choice is up to you.
1 × Male BNC plug (optional) This makes a nice output for your function gen

Project Logs

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To HACKADAY
Samuel Comeau • 10/28/2017 at 16:55 • 0 comments

Hello everyone,
So this is my first public project on HACKADAY.io and my first FPGA project in general. I will continue to work on the documentation.

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Build Instructions

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1

Obtain Mojo V3 Board

This amazing FPGA board can be found at:
https://embeddedmicro.com/
https://www.sparkfun.com/products/11953
2

Install the IDE

Install the Mojo IDE from:
https://embeddedmicro.com/tutorials/mojo-software-and-updates/mojo-ide
3

Install Xilinx ISE

This step is optional and is only required if you want to overclock the FPGA from 50MHz to 200MHz. Note that at 50MHz your maximum waveform frequency will be severely limited. For a 6-bit waveform, your maximum output would be 781KHz.
https://embeddedmicro.com/tutorials/mojo-software-and-updates/installing-ise