Quectel M66

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 42 / 80
3.8.3. Receiver and Speaker Interface Design
SPK1P
SPK1N
Differential layout
Module
10pF
0603
Close to speaker
GND
ESD
33pF
0603
33pF
0603
GND
10pF
0603
ESD
10pF
0603
33pF
0603
Figure 23: Handset Interface Design for AOUT1
SPK1P
SPK1N
Differential
layout
Amplifier
circuit
Module
10pF
0603
Close to speaker
GND
ESD
33pF
0603
33pF
0603
GND
10pF
0603
ESD
10pF
0603
33pF
0603
Figure 24: Speaker Interface Design with an Amplifier for AOUT1
Quectel
Confidential