Bil Herd, the designer of the Commodore 128, talks about DDS (Direct Digital Synthesis) on a CPLD. There is some excellent information here that is very applicable to the Papilio FPGA. Maybe we can even adopt this project to DesignLab.
“One of the acronyms you may hear thrown around is DDS which stands for Direct Digital Synthesis. DDS can be as simple as taking a digital value — a collection of ones and zeroes — and processing it through a Digital to Analog Converter (DAC) circuit. For example, if the digital source is the output of a counter that counts up to a maximum value and resets then the output of the DAC would be a ramp (analog signal) that increases in voltage until it resets back to its starting voltage…”
Leave a Reply
You must be logged in to post a comment.