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.