2016-07-15.md

Second hands-on with Goblin : an overview [](@description Second work with Goblin)

What does it do?

This Goblin board aims at getting a signal, and giving access to key points within the signal processing chain for ultrasound imaging, namely:

• Getting access to a TGC
• Getting the enveloppe of the signal
• Cleaning the signal before feeding in the on-board SPI ADC

All key signals are accessible, and jumpers, as well as pots, enable on-board fine-tuning of the signals. See more details on the testing session, to see the behavior of the board on a oscillo. __Beware, this session had a poor energy supply quality, so the 5V got quite low. The new log, covers it better.

Testing the board using 0.2V in gain input (max can be 1V, that's ~20% gain used)

Just after the TGC : A 60mV signal becomes a 300mV signal.

Which becomes, after enveloppe detection, a 400mV enveloppe.

Likewise, a 120mVpp signal becomes a 750mV enveloppe, clean.

View

Detailed view

Principles