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4.2.3 Synthesizer : LO2
The second local oscillator (LO2) consists of:
a) the SMARTIs (D400) PLL part
b) the 13MHz reference signal
c) a switchable VCO (inside the SMARTi)
d) an external filter (C509,C510,R501).
The VCO generates 2 frequencies (1440MHz for RX-Mode and 1696 MHz for
TX-Mode).
Both frequencies are divided by 4, to get the 360MHz demodulator frequency and
the 424MHz modulator frequency.
The RX/TX switching is done internally, initiated by the EGOLD+ through the
SYGCCL, SYGCDT,SYNSTR
Using the EGOLD+ signal
oscillator is switched "ON and OFF"
The required voltage
VCC2_8
V1.0
A35-A36-A40
signals.
PUPLO2
(TDMA-Timer L11)
for
D400
is provided by
PUPLO2
Page 9 of 38
Company Confidential
at pin 16, the second local
N430
Notes
External
filter LO2
ICM MP CC ST
09/01
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