Model
MASS 2
Version
V_1.0
Prepared by
H/W
Date
22/01/2008
Subject Technical
Manual Page
53/59
3.
TX VCO
Two power VCOs are integrated with OPLL to form a complete transmitter circuit. The TX VCO output power is
typically 9dBm with +/-2.5dB variation in GSM900 bands and +8dBm output power with +/-2dB variation in
DCS1800/PCS1900 bands over extreme Temperature conditions.
The PAM(RF3166) Input range is typically 3dBm. So 5dB Attenuator is added Between MT6120 and RF3166.
-
For GSM850/GSM900 : R406, R407, R408,
-
For DCS1800/PCS1900 : R403, R404, R405.
Tx VCO Frequency Range is same with Transmitter Frequency Range.
4.
Frequency Synthesizer
The MT6120 includes a frequency synthesizer with a fully integrated RF VCO to generate RX and TX local
oscillator frequencies. The PLL locks the RF VCO to a precision reference frequency at 26MHz. To reduce the
acquisition time or to enable fast settling time for multi-slot data services such as GPRS, a digital loop along with a
fast-acquisition system are implemented in the synthesizer. After the calibration, a fast-acquisition system is
utilized for a period of time to facilitate fast locking.
The frequency ranges of the synthesizer for RX mode are
RX mode GSM850 1737MHz ~ 1788MHz
GSM900 1850MHz ~ 1920MHz
DCS1800
1805MHz ~ 1880MHz
PCS1900 1930MHz ~ 1990MHz
The Calculate LO Frequency Fvco from RX Channel Frequency Fch is following.
Fvco = 2*Fch-200K
for GSM850 and GSM900
Fvco = Fch-100K
for DCS1800 and PCS1900.
The frequency ranges of the synthesizer for TX mode are
TX mode
GSM850 1813MHz ~ 1868MHz
GSM900 1936Mhz ~ 2059Mhz
DCS1800
1881Mhz ~ 2008Mhz
PCS1900 2035MHz ~ 2149MHz
The Calculate LO Frequency Fvco from TX Channel Frequency Fch is following.
(Set the divider ratio D1 of TX reference divider = 11)
Fvco = 2*D1*Fch/(D1-1)
for GSM850 and GSM900
Fvco = D1*Fch/(D1-1)
for DCS1800 and PCS1900.
Содержание MASS2
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