OFDM SDR Radio front end

OFMD_RADIO_FRONT_END

OFDM_RADIO_FRONT_END

Task:

To design a circuit that fulfills the strict jitter requirements of a fast OFDM radio front end.

Challenges:

  • Fast signals that require impedance controlled routing.
  • Extremely low Jitter requirements (200 fs).
  • Clean power
  • Clear board structure to isolate noise sources from vulnerable circuits

 Solution:

A carefully structured power regulator design with low noise DC/DC converters which provide an intermediate supply which is then regulated by low noise LDO’s to the final voltage ensure the best possible power quality with reasonable conversion losses.

A carefully planned PCB layout with clearly defined functional areas, ground plane management and meticulously executed bypassing and filtering

 

Technologies used:

Altium Designer, ICD Stackup Planner, Years of experience, some luck all added up to a first pass success with minimal revision requirements to achieve a production ready PCB.