13
U201
：
ABB
——
Analog Base Band,
is the bridge of digital and analog signal in the system. Audio, IQ and
other exterior analog signal can connect with DBB control centre through ABB. ABB controls system clock, A/D
D/A conversion, background light of keyboard, provide system power and charge interface etc. There is the
basic structure as follows:
Figure 6.2: ABB basic structure
U602:Transceiver:
is a high integrated multi frequency low power cost transceiver, there is the structure
as follows:
Summary of Contents for W420
Page 1: ...Voxtel Repair Manual Item W420 ...
Page 23: ...23 3 LDO circuit ...
