ETS2228 Maintenance Manual
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Page 23, Total 43
O
RESIN-N
PM6610
→
MSM6000
Supply replacement
signal to MSM6000
PON-RESETB(
5)
O
PM-INT-N
PM6610
→
MSM6000
Supply break
request signal to
MSM6000
MSM-INTERU
PTB(6)
Table 2 power management module interface’s signal description
3.4 RF Part
ETS2228 is the FWT working in the 800M frequency band .The structure of the FWTs which use
WL71PIPU but working different frequency band is the same and the difference is RF part.
1 .Receiving unit
Unit function: After the duplex module sufficiently suppresses the out-of-band spurious filter, the
received radio frequency signals will be sent to the down-convert frequency mixer via the radio
frequency low noise amplifier and radio frequency SAW filter to experience the frequency mixing
operation. Since RFR6120 assumes the
“
Zero Intermediate Frequency
”
structure, the radio frequency
signal can be directly converted into baseband signals. The following operations are I/Q demodulation
and filter amplifying, and ADC processing. Finally, the digital base band signal will be sent to baseband
processing unit MSM6000.
