Concept

Chaine acquisition US au format pHAT

Contraintes

Petite taille (pHAT)
Acquisition temps réel
20Msps au niveau de l'ADC, 10 bits (quicker, and 12bits if possible)
No external RAM =)
Blocks DSPs disponibles
Serie ice40 :)
Used only with RPi: fpga can be programmable through RPi / ice40 toolchain

Nice to have

If there's enough room:

Test points for logic signals (PPon, PNon, damp, trig, ...)
Flash
2 petits boutons (1 reset, 1 trigger)

Fonctions requises:

Pulser, bipolar, en HVPos et HVNeg
Protect variable gain : path should not exceed +-2V
Choice between two entries for VGA path (one from pulser, another from raw SMA)
Variable gain to have
- DAC to set up the variable gain (as in matty)
- activate, or not, a fixed gain (eg, the HILO input on AD8331)
ADC a minima around 20Msps, 12 bits
Real time
SPI connection through RPIo connector
Unused IOs to RPi GPIOs
Logic trigger to start acquisition
500 us d'acquisition

Fonctions externes

Generation des hautes tensions + et - (board separée, connecteur à prévoir avec protection polarité )
Controle RPi

Affichage

LEDs sur HILO, CS du RPi
3 LEDs user accessible