https://github.com/ZipCPU/dpll

A collection of phase locked loop (PLL) related projects
https://github.com/ZipCPU/dpll

fpga gplv3 pll verilator verilog

Last synced: about 1 month ago
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A collection of phase locked loop (PLL) related projects

• Host: GitHub
• URL: https://github.com/ZipCPU/dpll
• Owner: ZipCPU
• Created: 2017-12-04T18:25:21.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2024-01-18T16:22:26.000Z (8 months ago)
• Last Synced: 2024-04-12T09:04:51.704Z (5 months ago)
• Topics: fpga, gplv3, pll, verilator, verilog
• Language: Verilog
• Size: 690 KB
• Stars: 87
• Watchers: 10
• Forks: 25
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
I'd like to [post](http://zipcpu.com) about some simple and some basic

[Phase Locked Loop](https://en.wikipedia.org/wiki/Phase-locked_loop) algorithms.

To do this I'm going to need some demo code, which I'll keep in this repository.

## Blog posts

I recently [posted](http://zipcpu.com) two articles describing the components

of a basic [PLL](https://en.wikipedia.org/wiki/Phase-locked_loop), and hence

the implementation found in this repository.  These are:

1. [How to build a Numerically Controlled Oscillator (NCO)](http://zipcpu.com/dsp/2017/12/09/nco.html) within an [FPGA](https://en.wikipedia.org/wiki/Field-programmable_gate_array).

2. [The Logic PLL](http://zipcpu.com/dsp/2017/12/14/logic-pll.html) based upon the code in [rtl/sdpll.v](rtl/sdpll.v).

If the [Lord is

willing](https://www.blueletterbible.org/kjv/jas/4/15/), I may go deeper

and describe some other 

[PLL](https://en.wikipedia.org/wiki/Phase-locked_loop) implementations as

well--such as the sample time tracking PLL that I recently added.

## Tutorial slides

I placed a quick/short set of [tutorial slides](doc/tutoria.pdf) in the

[doc/](doc/) directory.  Feel free to browse them and see what you think.

## License

All of the source code in this repository is released under the

[GPLv3](https://www.gnu.org/licenses/gpl-3.0.en.html).  If these conditions

are not sufficient for your needs, other licenses terms may be purchased.