Telit Wireless Solutions GM862-GPS Manuale Utente Scaricare il pdf (Pagina 43)

GM862-GPS Hardware User Guide

1vv0300728 Rev. 0 - 27/04/06

The resulting gain and high pass cut can be obtained with the formula:

Gain =

4*3*2

freq

= [Hz]

And an example of internal Ear amplifier could be :

Some amplifier require a low impedance load at high frequency in order to avoid auto oscillation, this

can be made with a capacitor (100nF) in series with a resistor (15Ω).

When designing your application, remember to provide an adequate bypass capacitor to the amplifier

and place it close to the power input pin of the IC, keeping the traces as short as possible.

6.5 Hands-free earphone (low power) design

The same design considerations made for the handset are valid for the hands-free earphone.

+12dB

GM862-GPS

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Telit Wireless Solutions GM862-GPS Manuale Utente Pagina 43