I'm trying to recover a signal that is encoded and then modulated as 1mA current load pulses on the supply line. What's the best way to do this?
- 250us long 1mA current increase on each edge of (followed by 250us normal current state)
- Original signal is 2kHz (cannot be changed)
- Supply current is 0~30mA (so for 5mA sys current the modulation would be 6mA for 250us)
- Need to filter out false pulses less than ~200us wide