Part 2 : Transmitter
Fig.5:TRX -The TX IF Modulator W2013 (IC100)
TIPI
TINI
TQPI
TQNI
(1,16,20)
TIF Filter
270MHz
TIF Filter
180MHz
2
3
2v85_rf3
W2013
GND
GND
3V_G_TX
TR106
TR107
5
6
7
4
3V_P_TX
Div2/3
PMB2410 (IC300)
540Mhz
Osc
180 - 270Mhz
GSM_TX
To IC101
To IC102
9
Loop Filter
32
IF-PLL
The TX IF Modulator
The TX I & Q signals from IC27 #86-89 are fed to #4-7 of the W2013 TX
modulator (IC100), where they are then modulated onto either a TX IF of 270Mhz
(for GSM- TX) or 180Mhz (for PCN-TX) by the quadrature mixer inside IC100.
The signal TX LO IF (180-270Mhz) is input on #9 of IC100 (W2013) from (IC300)
#24. This signal is produced by the internal 540Mhz oscillator within IC300, which
has been divided down by a factor of 2 for GSM-TX or 3 for PCN-TX. This division
factor is set by the control signal GSM_TX from IC27 #23.
The TX modulated IF signal of 270Mhz is output on #2 of IC100 for GSM or a
modulated IF signal of 180Mhz is output on #3 of IC100 for PCN.
Pre-amp transistors TR106 and TR107 amplify the signal and then pass it through
to BPF’s: FL100 or FL101 for filtering and then after to the RF Mixer’s (IC101 or
IC102).
Содержание DB2000
Страница 1: ...DB2000 Service Manual Help ...
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Страница 4: ...Important One incorrect adjustment may result in the need for many more and result in extra 0 1 2 2 ...
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Страница 77: ... 1 2 ...
Страница 83: ...Fit Antenna INSERT AND SCREW THE ANTENNA INTO THE ASSEMBLY ...
Страница 106: ...Part 5 Test Signals Fig 3 4 V_G_LNA Pg 3 5I TP300 Fig 3 5 V_P_LNA Pg 3 5J TP301 Fig 3 6 RX_ON2 Pg 3 16G TP405 ...
Страница 107: ...Fig 3 7 GSM_LNA Pg 3 3I TP419 Fig 3 8 PCN_LNA Pg 3 3J TP420 Fig 4 9 TCXO Pg 2 H11 TP413 ...
Страница 108: ...Fig 4 0 GSM Rx I Q s Pg 3 E F15TP406 7 Fig 4 1 PCN Rx I Q Pg 3 E F15 TP406 7 Fig 4 2 GSM_TX Pg 1 1I TP403 ...
Страница 109: ...Fig 4 3 PCN_TX Pg 1 1J TP417 Fig 4 4 3V_G_TX Pg 1 4I TP100 Fig 4 5 3V_P_TX Pg 1 4J TP101 ...
Страница 110: ...Fig 4 6 GSM_ON Pg 1 2K TP402 Fig 4 7 PCN_ON Pg 1 1K TP415 Fig 4 8 PRE_ON Pg 1 4J TP416 ...
Страница 112: ... I Q ...
Страница 113: ...Fig 4 14 V_ERROR PCN Pwr Lvl 7Pg 1 16I Fig 4 15 300khz Charge Pump Pg 1 Log 9G ...
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Страница 144: ...M5 TV0501 2SC4180 T1 NPN TRANSISTOR TR200 TR204 Emitter Base Collector Surface Mount NPN Epitaxial Planar Transistor ...
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