Rf Section - Panasonic KX-TCD725AXM Service Manual

7.2.

RF SECTION

DRON
3.8V
TXDA
CHP
Loop
filter
PD
SYRI :R
SYEN
SYDA
SYCL
RXDSG
RXDA
S&H
RSSI
7.2.1. BLOCK DIAGRAM RF SECTION (HANDSET)
The RF section consists of two main components: The PMB6610 transceiver and the PMB6618 power amp.
In the transceiver the 10.368MHz clock signal SYCL is multiplied to around 1.9GHz using PLL (Phase Locked Loop) control.
The TXDA signal is used to control the modulation of this frequency to 1.87GHz to 1.93GHz.
Received signals are demodulated, filtered and sent to the BBIC via the RXDA line.
VCC
VCC1
VCC2
voltage voltage
VCC
regulator regulator
VCC1
x2
VCO
TX Part
:N/A 32/33
PLL &
control logic
Demodulator
PMB6610
DECT transceiver
RXON
Low IF
band pass
filter RX Part
Fig. 28
31
PAON
PMB6818
Power amp.
Printed
balun
PAON
Printed
Printed
balun
KX-TCD725AXM