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3. TECHNICAL BRIEF
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(2) Transmitter Part
The transmit (Tx) section consists of an I/Q baseband upconverter, and offset phase-locked loop (OPLL)
and two output buffers that can drive external power amplifiers (PA), one for the GSM 850 (824-849 MHz)
and E-GSM 900 (880-915 MHz) bands and one for the DCS 1800 (1710-1785 MHz) and PCS 1900 (1850-
1910MHz) bands.
A. IF Modulator
The baseband converter(BBC) within the GSM chipset generates I and Q baseband signals for the Transmit
vector modulator. The modulator provides more than 40dBc of carrier and unwanted sideband rejection and
produces a GMSK modulated signal. The baseband software is able to cancel out differential DC offsets in
the I/Q baseband signals caused by imperfections in the D/A converters. The Tx-Modulator implements a
quadrature modulator. A quadrature mixer upconverts the differential in-phase (TXIP, TXIN) and quadrature
(TXQP, TXQN) signals with the IFLO to generate a SSB IF signal that is filtered and used as the reference
input to the OPLL.
The IFLO frequency is generated between 766 and 896 MHz and internally divided by 2 to generate the
quadrature LO signals for the quadrature modulator, resulting in an IF between 383 and 448 MHz.
For the E-GSM 900 band, two different IFLO frequencies are required for spur management.
Therefore, the IF PLL must be programmed per channel in the E-GSM 900 band.
Figure. 3-3 SI4210 TRANSMITTER PART
Содержание KG240
Страница 1: ...Date April 2006 Issue 1 0 Service Manual Model KG245 Service Manual KG245 ...
Страница 3: ... 4 ...
Страница 81: ...4 TROUBLE SHOOTING 82 4 13 KEY backlight Trouble TEST POINT Figure 4 20 a KEY Backlight Trouble ...
Страница 90: ...5 DOWNLOAD AND CALIBRATION 91 5 2 Download Procedure 5 2 1 Computer Program file MultiGSM exe Click ...
Страница 92: ...5 DOWNLOAD AND CALIBRATION 93 5 2 3 Configuration Setting C GSMULTI Model MG210 dll ...
Страница 93: ...5 DOWNLOAD AND CALIBRATION 94 5 2 4 Press Start Button KG245 ...
Страница 94: ...5 DOWNLOAD AND CALIBRATION 95 5 2 5 After Start Button Which Stand by condition KG245 ...
Страница 95: ...5 DOWNLOAD AND CALIBRATION 96 5 2 6 SW downloading Condition KG245 ...
Страница 96: ...5 DOWNLOAD AND CALIBRATION 97 5 2 7 SW downloading END Condition KG245 ...
Страница 99: ...5 DOWNLOAD AND CALIBRATION 100 4 Click on CALIBRATION START button KG245 KG245 ...
Страница 100: ...5 DOWNLOAD AND CALIBRATION 101 6 BLOCK DIAGRAM ...
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Страница 110: ... 111 8 PCB LAYOUT ...
Страница 111: ... 112 8 PCB LAYOUT ...
Страница 112: ... 113 KG245 8 PCB LAYOUT ...
Страница 113: ... 114 KG245 8 PCB LAYOUT ...
Страница 121: ...10 STAND ALONE TEST 122 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
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Страница 145: ...Note ...
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