Distribution Amp - S/N 16

Update2: Here's the 14-hour data together with a 14-hour noise-floor run. The ADEV and TDEV results are more or less instrument-limited. Only for phase-noise above 100Hz offset is the instrument floor significantly below the result for the distribution amplifier.

  • ADEV
  • phase
  • PN
  • TDEV

Update: Here's a 14 hour run of the residual phase noise, ADEV, and TDEV, as measured through the frequency distribution amplifier. Instrument is a Microsemi 3120A phase-meter.

  • ADEV
  • PN
  • TDEV

Aivon has now produced around 16 of these distribution amplifiers.

There's a new op-amp which might be interesting to try for the FDA board: THS3491. It has a grounded pad under the op-amp, so we need a new EP-variant of the PCB.

KiCad symbols and footprints

Update: Molex R/A 'long-neck' SMA-connector:

Silkscreen only on board, F.fab drawing shows off-board threaded part.

I sumbitted a few pull-requests to the KiCad libraries with some parts used on recent boards. Let's see if/when they make it into the main/released libraries...

On the to-do list is to submit an SFP-connector and Cage footprint... (unless someone has already done that?).

  • Abracon ABLNO SMD footprint
  • BNX025 EMI-filter
  • Murata BNX025 EMI-filter
  • LT1963 positive adjustable LDO
  • LT3013 negative adjustable LDO
  • Morion OCXO (sine-wave)
  • Morion OCXO
  • Morion OCXO
  • OCXO OH300 (symbol has a square-wave, but part outputs sine-wave...)
  • Connor-Winfield SMD OCXO "OH300"
  • Abracon ABLNO VCXO (100MHz)

Pirttibacka 10k feat. Giant's Kettle

The loop marked with yellow signs from Pirttimäki is about 8 km, so we did some bonus-metres to the south of Sorlampi to get a full 10k. As a bonus we looked at the Giant's Kettles just north of Sorlampi (arrow-marks-the-spot).
Although the weather is warm, around +6C maybe, It's fairly dark around 16-17 already 🙁
  • Pirttimäki, Giant's Kettle
  • Pirttimäki, Giant's Kettle feat. running-shoe.

Noise Colours - again

Inspired by discussion on time-nuts, here's a revised noise-colour graph. There are a few updates: The PSDs (both phase and frequency) now cross at 1 Hz (with the relation between phase-PSD and frequency-PSD explicitly stated), and the ADEV/MDEV theoretical lines now include the formula for the pre-factor (the old graph only had 'proportional to' here).

Source: example_noise_slopes2.py

Simulated time-series with power-law noise. The relation between phase-PSD, frequency-PSD, ADEV, and MDEV is shown.

It is left as an exercise to the reader to properly explain the ADEV pre-factor for flicker-phase noise :).