First hands-on with Goblin : an overview [](@description First experiment on 08th July 2016)

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.

View

Detailed view

Principles

Testing the board

Signal in vs Signal out of the TGC

Trying with different frequencies

At 3 MHz

At 5MHz

At 7.5MHz

At 10MHz

Difference between enveloppe and ADC input?

-> the offset is removed, there's also a small gain (x2).

See below: there's an offset at the enveloppe detection (~RMS), which is removed. Enveloppe is 500mV before, comes at 1V+ afterwards.

Before the AOP

After the AOP

TODO: Table

To know more

Components that have been used

TGC:
Enveloppe detection:
ADC:

TODO =)