• Table of contents
• osmo-clock-gen
  • Schematics
  • PCB layout
  • Design files
  • Firmware
  • Availability
  • License

osmo-clock-gen¶

The osmo-clock-gen is a small open hardware device that can be used to generate up to eight different clocks from a single clock reference.

This is very useful in case you e.g. have a highly stable 10 MHz reference frequency but require a different, stable frequency, such as a 52 MHz reference for USPR1, or 40 MHz for LimeSDR-mini or 30.72 MHz for some other SDR devices. It can also be used to generate stable reference clocks for satellite LNBs.

10 MHz reference frequencies are often available in a variety of labs as output of a GPS-DO, OCXO , Rubidium oscillator or other high-precision clock source.

Schematics¶

PDF rendering is available as clock-generator.pdf attached to this page.

PCB layout¶

The PCB design is a dual-layer board in 100x50mm size. The important connectors are on one edge, while optional other connectors are on another edge

Design files¶

The design files can be found in the osmo-small-hardware.git repository. Web access is provided via https://git.osmocom.org/osmo-small-hardware/tree/clock-generator

Firmware¶

There is no firmware for the onboard SAMD11 microcontroller yet. It will be released as open source software.

Availability¶

This project is currently in the design verification stage. Once the verification has completed, it is expected that osmo-clock-gen boards will be made available via the sysmocom webshop.

License¶

The osmo-clock-gen design is made available as Open Source Hardware (OSHW) licensed under CC-BY-SA (Creative Commons Attribution Share-Alike).

This means anyone can use the design to build units, or to create derivative versions of the design. However, you have to give attribution and release your derivative works under the same license as the original project.