Quectel GSM Series - Receiver Reference Circuit

GSM/GPRS Modules
GSM Module Audio Design Guide
GSM Module Audo Design Guide Confidential/Release 11 / 35
2.1.1.2. Receiver Reference Circuit
SPK1P
SPK1N
Differential layout
10pF
10pF
33pF
33pF
33pF
Close to speaker
GND
GND
10pF
Module
ESD
ESD
Figure 2: Receiver Reference Circuit for AOUT1
SPK1P
SPK1N
Differential layout
Amplifier
circuit
10pF
10pF
33pF
33pF
33pF
Close to speaker
GND
GND
10pF
Module
ESD
ESD
Figure 3: Receiver Reference Circuit with Audio Power Amplifier for AOUT1
Quectel
Confidential