LG MG210 Service Manual page 31

3. H/W Circuit Description
3.5.5. Baseband Codec (BBC)
Baseband codec is composed of baseband uplink path (BUL) and baseband downlink path (BDL).
BUL makes GMSK (Gaussian Minimum Shift Keying) modulated signal which has In-phase (I)
component and quadrature (Q) component with burst data from DBB. This modulated signal is
transmitted through RF section via air. BDL process is opposite procedure of BUL. Namely, it performs
GMSK demodulation with input analog I&Q signal from RF section, and then transmit it to DSP of DBB
chip with 270.833kHz data rate through BSP.
Figure 13. Baseband Codec Block Diagram
3.5.6. Voltage Regulation (VREG)
There are 7 LDO (Low Drop Output) regulators in ABB chip. The output of these 7 LDOs are as
following table. (Figure14) shows the power supply related blocks of DBB/ABB and their interfaces in
MG210.
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