Sgdy0010901 driver

The receive path is fully differential to suppress on-chip interferences. Several gain steps are implemented to cope with the dynamic range of the input signals. Depending on the baseband ADC dynamic range, single- or multiple gain step switching schemes are applicable. Furthermore an automatic DC-offset compensation can be used depending on the gain setting to reduce the DC-offset at baseband-output. A programmable gain correction can be applied to correct for front end- and receiver gain tolerances.

The digital transmitter architecture is based on a very low power fractional-N Sigma-Delta synthesizer without any external components see Figure The output of its associated VCO is divided by four or two, respectively, and connected via an output buffer to the appropriate single ended output pin. This configuration ensures minimum noise level.

The resulting amplitude information is fed into a digital multiplier for power ramping and level control. The ready processed amplitude signal is applied to a DAC followed by a low pass filter which reconstructs the analog amplitude information. The divided output of its associated VCO is fed to a highly linear amplitude modulator, recombining amplitude and phase information. The output of the amplitude modulator is connected to a single ended output RF PGA for digitally setting the wanted transmit power.

In 8PSK mode, the ramping functionality is assured by an on-chip ramping generator, whereas output power is controlled by the PGAs as described above. RF synthesizer The transceiver contains a fractional-N sigma-delta synthesizer for the frequency synthesis in the RX operation mode.

The 26MHz reference signal is provided by the internal crystal oscillator. This frequency serves as comparison frequency of the phase detector and as clock frequency for all digital circuitry.

The divider in the feedback path of the synthesizer is carried out as a multi-modulus divider MMD. The loop filter is fully integrated and the loop bandwidth is about kHz to allow the transfer of the phase modulation. The loop bandwidth is automatically adjusted prior to each slot OLGA 2. To overcome the statistical spread of the loop filter element values an automatic loop filter adjustment ALFA is performed before each synthesizer startup.

The fully integrated quad-band VCO is designed for the four GSM bands , , , MHz and operates at double or four times transmit or receive frequency. To cover the wide frequency range the VCO is automatically aligned by a binary automatic band selection BABS before each synthesizer startup. The only external part of the oscillator is the crystal itself.

The overall pulling range of the TCXO consists of eight subranges. The subrange closest to the 0ppm at the middle AFC-value is selected during the calibration process in the mobiles production and is used for the rest of the lifetime.

Front End Module control Implemented in the Transceiver are two outputs for direct control of front end modules with two logic input pins to select RX- and TX-mode as well as low- and high band operation. Only for training and service purposes 4. PCB layout - 65 - 4.

PCB layout 4. Trouble shooting 5. Only for training and service purposes 5. Only for training and service purposes R K C u 0. Bias come from BBP? Assemble Check mic. Pin3 of U is low? Q is working? Trouble shooting - 93 - 5. Trouble shooting - 95 - 5.

See next page to check PLL Circuit. DA Data is Normal? CLK Clock is Normal? Trouble shooting - 97 - 5. Trouble shooting - 99 - 5. Trouble shooting - - 5. Only for training and service purposes C 22p 10p C C 1. Check Antenna. Only for training and service purposes 6. If you are going to use battery, the voltage of the battery should be over 3. Only for training and service purposes - - 6. Each section is described in the text below. Click the check box to enable or disable file download.

Click on the blue text to select the file to download. This will open a normal file select box. Select the wanted file. Click OK button to next step. The FLS filename and the expected checksum are shown. The download statistics are shown.

Click Reset to reset the counters. After download, the status is shown. To stop the download the panel must be clicked twice. This is to avoid that the download is stopped accidentally. Furthermore, to avoid that the download is stopped on a mouse double-click, there must be at least 0. If the panel is clicked only once, the text Click again to stop will disappear and the download will continue.

If a valid second click is detected, the download process is stopped and the progress bar turns yellow. At this point the download can be started from the beginning as usually. NOTE: That the download statistic is unaffected when the download is stopped manually. Only for training and service purposes - - 12 E B. Only for training and service purposes - - 8.

Only for training and service purposes 9. Turn on the Phone. RF Calibration 9. Only for training and service purposes - - 9.

Setup Line System menu such as the following figure 9. Setup Logic operation such as the following figure. RF Calibration finishes. Only for training and service purposes Stand-alone Test - - 9. Calibration data will be saved to the following folder. Calibration program automatically changes either normal mode or ptest mode. Stand along - - Stand along Then Standalone Test setup is finished. Only for training and service purposes Connected Change "ptest mood" 5 6 - - Only for training and service purposes 1 2 3 4 - - Heavy Duty USB 3.

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