Introduction to transmitter functionality

Transmitter functions are implemented in an RF ASIC. The ASIC contains a BB frequency low pass filter, which is tunable according to the signal bandwidth of the system in use. In addition, the ASIC contains separate RF paths comprising a final frequency IQ modulator and VGA amplifiers. GSM transmitter functionality An RF ASIC receives an analogue IQ modulated signal from digital BB, which is first low pass filtered with filter corner frequency set to approximately 200 kHz. After the filter, the...

Omap

Consists of ARM926 (MPU subsystem), TMS320C55x (DSP subsystem), DMA and OMAP3.3s internal peripherals. based on an ARM926EJ. MPU is able to perform most of the application operations on the chip. mainly used to help the MPU and DSP perform data memory transfer-specific tasks, leaving more available MIPS for both processors. based on a TMS320C55x DSP core, which is responsible for intensive data computing tasks like real-time audio and video handling on application side, e.g. voice recording....

Baseband description System module block diagram

The device consists of two different main modules transceiver and UI. The transceiver board consists of baseband and RF components. The UI board consists of key domes and keypad backlights. Connection between the UI and the transceiver board is established via a board-to-board spring connector. Note In this description, the user interface hardware includes the following components display, camera, keyboard, keyboard backlight and ALS. Figure 86 System level block diagram Figure 86 System level...

RS MMC interface

The reduced size (24 mm x 18 mm x 1.4 mm) multimedia card slot is located under the battery. The device supports RS MMC hot insertion, which enables to remove insert the card when the phone is powered on. The RS MMC card is connected to the application processor MMC SDIO2 (1.8 V) interface. The MMC interface is shown in the following figure The basic multimedia card concept is based on the following communication signals CLK, CMD and DAT. With each cycle of the CLK signal, one bit transfer on...

Back camera slider detection switch

The back camera and flash LED have a cover slider, which position is detected with a slider switch (slider sensor). When the slider covers the back camera and flash LED (upper position), the slider switch is open circuit (not pressed) and the application processor is connected to VIO. When the slider is slid down, the switch is pressed and it connects the Helen pin mcbsp1_sync to GND (typical 160mV) and activates the back camera application

Baseband functional description

Application Functional Block Diagram

Digital baseband consists of an ISA (Intelligent Software Architecture) based modem and Symbian based application sections. The modem functionality is in RAP, and the application processor engine acts as a platform for Symbian applications. The terms ISA and Symbian are used refer to the software environment of these devices. The modem section consists of a RAP ASIC with NOR FLASH and SDRAM memory as the core. RAP supports the GSM (EDGE class 10, GPRS phase2) cellular protocol. The modem SDRAM...

Camera interface

Nokia 6681 Camera Pin Diagram

The device uses a 2.0 megapixel camera module with a sensor resolution of 1600 x 1200. The following block diagram shows how a CCP bus is used to transfer image data from the camera module to the phone engine. This bi-directional control bus is a software-implemented I2C interface. The camera regulator N1470 powers the digital parts of the camera, and a camera regulator N1471 is used for powering the analogue parts. A CAMVCTRL signal (Vctrl) is used for activating the camera module. When the...

Steps

Cover the light guide upper part of the A-Cover . 4. Choose Tuning Ambient Light Sensor Calibration. Figure 51 Ambient Light Sensor Calibration window 5. In the Pull Up Resistor Calibration pane, click Start, and Write. Figure 51 Ambient Light Sensor Calibration window 5. In the Pull Up Resistor Calibration pane, click Start, and Write. 6. In the Ambient Light Sensor Calibration pane, check the Use default values only check box, and click Write. 7. To end the calibration, click Close.

Introduction to RF troubleshooting

All measurements should be done using spectrum analyser with a high-frequency high-impedance passive probe LO- reference frequencies and RF power levels oscilloscope with a 10 1 probe DC-voltages and low frequency signals Caution All measurements with an RF coupler should be performed in RF shielded environment because nearby base stations can disturb sensitive receiver measurements. If there is no possibility to use RF shielded environment, it should be checked that there are no transmissions...

Power key

The system boots up when power key is pressed adequate battery voltage, VBAT, present . Power down can be initiated by pressing the power key again the system is powered down with the aid of SW . Power on key is connected to N2200 ASIC via PWRONX signal. Figure 89 Power distribution diagram Figure 89 Power distribution diagram Power supply components N2200 N2300

GSM transmitter tunings Tx IQ tuning GSM Context

The Tx path branches to I and Q signals at the RF I Q modulator. Modulator and analog hardware located after the modulator cause unequal amplitude and phase disturbance to I and Q signal paths. Tx IQ tuning balances the I and Q branches. Tx IQ tuning must be performed on all GSM bands. Steps 1. Start Phoenix service software. 3. From the Operating mode drop-down menu, set mode to Local. 4. Choose Tuning GSM Tx IQ Tuning. 5. From the Band drop-down menu, choose GSM900. 6. In the Tx IQ Tuning...