Conditioning the signal

AN4368

12/18

DocID025334 Rev 1

Figure 9 shows the output voltage of stage 1 where the AC signal has been amplified and

filtered for the first time. In this example, the Vout1 signal is an amplification by 53 of the

Vsensor signal around its average value. Two peaks can be discerned. However, at this

stage, it is not possible to say if these peaks represent real motion or not. The magnitude of

the signal is still not big enough for a microcontroller.

Figure 9: Output voltage of stage 1