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3.4.5. 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.
3.4.6. 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 G5500/7050.
Figure 13. Baseband Codec Block Diagram
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