Nokia 6020b Service Manual
RM-31
Nokia Customer Care
7 - System Module
12
COMPANY CONFIDENTIAL
Issue 1 03/2005
Copyright © 2005 Nokia. All Rights Reserved.
The UEMEK ASIC handles the analog interface between the Baseband and the RF section.
UEMEK provides A/D and D/A conversion of the in-phase and quadrature receive and transmit
signal paths and also A/D and D/A conversions of received and transmitted audio signals to
and from the user interface. The UEMEK supplies the analog TXC and AFC signals to the RF
section according to UPP signal control. There are also separate signals for PDM coded audio.
Digital speech processing is handled by the DSP inside UPP ASIC.
UEMEK provides A/D and D/A conversion of the in-phase and quadrature receive and transmit
signal paths and also A/D and D/A conversions of received and transmitted audio signals to
and from the user interface. The UEMEK supplies the analog TXC and AFC signals to the RF
section according to UPP signal control. There are also separate signals for PDM coded audio.
Digital speech processing is handled by the DSP inside UPP ASIC.
UEMEK is a dual voltage circuit, the digital parts are running from the baseband supply 1.8V
and the analog parts are running from the analog supply 2.78V or backup battery. Also VBAT
is directly used (Vibra, LED-driver, Camera Regulator).
and the analog parts are running from the analog supply 2.78V or backup battery. Also VBAT
is directly used (Vibra, LED-driver, Camera Regulator).
The Baseband supports both internal and external microphone inputs and speaker outputs.
Keypad tones, DTMF, and other audio tones are generated and encoded by the UPP and trans-
mitted to the UEMEK for decoding. An external vibra alert control signals are generated by the
UEMEK with separate PWM outputs.
Keypad tones, DTMF, and other audio tones are generated and encoded by the UPP and trans-
mitted to the UEMEK for decoding. An external vibra alert control signals are generated by the
UEMEK with separate PWM outputs.
EMC shielding is implemented using a soldered shielding, RF cans and PWB grounding.