Reaction Wheels - Model RC and Op Amp filters for PWM -> Analog conversion

[Aidan-Sheedy]

Motivation/Description ⛰️

Using PWM for the ramp control on the driver boards has had issues, so we're looking into using a PWM to analog filter instead.

Next Steps 🚶

• [ ] Create a Spice model of an op-amp circuit (Sallen-Key)
• [ ] Compare results of RC filter and op-amp filter for
  • ripple
  • response time
• [ ] Determine optimal circuit and resistor/cap values
• [ ] Update Reaction Wheel Documentation with the results for the CSDC-6 Design

Supporting Material and Resources 📖

• Wikipedia on Sallen-Key
• PCB Repository

Definition of Done 💯

This task is complete when a design has been selected for the filter which has been weighed against the RC and Sallen-Key options thoroughly modelled and tested in Spice.

Tags

tag people that should know about this issue

cc: @SeanTedesco @emmapaczkowski @Aidan-Sheedy