morgan f58ab13e9b improve jitter generation

wave_gen: change to gussian jitter distribution
wrapper: reduce gtx_jitter to meet real world performance
docs: remove noise limitation

2023-12-13 17:14:20 +08:00

WRPLL simulation

A time domain simulation for WRPLL

Installation

poetry install
poetry run jupyter lab

poetry install
poetry shell

nix develop

Three notebook examples are included
1. helper_PLL_example.ipynb : helper PLL only
2. main_PLL_example.ipynb : main PLL only with a user specific helper frequency
3. both_PLL_example.ipynb : main and helper PLL
RAM usage and execution time estimate for simulation ONLY
1. 100,000,000 time steps: 6GiB RAM and 12 seconds
2. 200,000,000 time steps: 11GiB RAM and 20 seconds
3. 300,000,000 time steps: 16GiB RAM and 35 seconds

WRPLL formulas

Assume the difference between f_{main}, f_{gtx} is very small
- Let f_{in} = f_{main} = f_{gtx}
- f_{helper} = f_{in} * \dfrac{N-1}{N}
- f_{beat} = f_{in} - f_{helper} = \dfrac{f_{in}}{N}
Main and helper Si549 DCXO ADPLL setting
- ADPLL = \dfrac{\Delta f_{outppm}}{0.0001164}