Improving the ADC board
Liliane Dias FernandesJune 2013
Outline
Context and needs
First problem
Second problem
New board
Results
2
Context and needs
Two boards
Multiplexers, termination, operational amplifier
Distortion
Too noisy
3
4
Distortion of the signal
First problem
First problem5
Simulation of the operational amplifier
No distortion shown
First problem6
With and without the multiplexer
Residual resistor of the multiplexer
Current in the termination
First problem7
Fix the multiplexer problem move terminations
First problem
New amplifier : LMH6518
High impedance input
Programmable low pass filter
Programmable gain
8
Second problem9
Supplied directly
Second problem10
With the second board
Second problem
Cliquez pour modifier les styles du texte du masque Deuxième niveau
▪ Troisième niveau
▪ Quatrième niveau
Cinquième niveau
11
3.3V
To fix the problem
New board
Multilayered circuit board
Two types of ground
Mechanical connector
12
New board13
MUX
Terminations
LDO
DC/DC converter
Amplifier
Results
Debugging
Tests
14
15
Thank you for your attention.