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amps_jas
05-10-2007, 03:37 PM
3310_Blocks_1 :

The Basic Phone Model selected for our study is NOKIA 3310. This 3310 phone has many modified additions to it’s family like 3315,3330,3350,3390 to mention the popular ones.



To understand the working pattern of this Mobile Phone, this 3310 phone can be split into 4 sections :

(1) Signal Processing Section, which consists of RF Section, IF Section and lastly the Audio Section. We can see in the block that this Signal Processing Section is working in 2 directions. The Signal carrying the voice signals of the person on the other side is entering the Antenna and is called the Rx signal and it gets processed in the RF,IF and finally the AF or the Audio Sections of the phone to be available for hearing thro’ the SPEAKER. Similarly, the Voice Signal picked up by the MICrophone of the phone is the Signal to be Transmitted and so becomes the Tx signal passing in the opposite direction of the Rx Signal to reach the Tower thro’ the Antenna of our Mobile Phone.

(2) Logic Section which consists of the CPU and the FLASH and RAM sections. Logic Section works according to the program stored in the flash IC. The CPU or the Central Processing Unit of the phone makes this section the Brain of the whole unit. All the logic or the intelligence is stored in the memory devices the FLASH and the RAM chips in this section. Like a Guardian in the Family, the CPU keeps a Constant watch on most of the activities taking place in the phone and sends the correcting commands or signals to appropriate Sections as and when necessary. It takes help of it’s allies, the FLASH & RAM chips to take a decision by making references stored in them for comparision. Some of the activities it is monitoring are : (i) Strength of the received signal (ii) battery voltage (iii) charging current (iv) battery temperature (v) charging voltage (vi) clock or timing related functions (vii) memory availability (viii) on or off state of the phone (ix) sim data for synchronizing with the service provider data (x) availability of services subscribed with the service provider like Calling number identification (Caller ID availability), Call waiting, Call Diverting, Call Forwarding etc. (xi) most importantly the validity of the IMEI check both for it’s internal verification as well as for validating by the service provider for blacklisted IMEI numbers.

(3) UI (User Interface ) Section consisting of Speaker, Microphone, LCD Display, LCD LEDs, KEYPAD LEDs, Vibrator, Buzzer and KEYPAD Assemblies. I believe this are self explanatory parts or functions and hardly need any description.

(4) Power Supply Section which consists of the Charging Circuit, the Battery, the Power Distribution Section and the SIM CIRCUIT. With the help of the CPU and it’s allied logical allies, a perfectly tuned battery charging function is achieved for best performance and long life of the battery. Also power is distributed from the Battery to all the sections of the phone from this section with the help of the Power Distributor Chip.
Also this section reads the data stored in the SIM Card and refers it to the CPU or the logic section to further process and validate it with the help of Signal Processing Section so that the mobile phone gets the access and remain connected to the network of the SIM Card provider company also called the service provider company.

amps_jas
05-10-2007, 03:39 PM
3310_Blocks_2 :

The Major Parts used in the above Sections are as follows :

(1) Signal Processing Section
Z502 Antenna Switch
Z501 Dual Frequency Band Pass Filter
V501 HF (High Frewquency) Amplifier for 900MHz Signal
V500 HF (High Frequency) Amplifier for 1800MHz Signal
Z500 Dual Freq. band Pass Filter
N500 HAGAR IC Demodulates Rx Signal and Modulates the Tx Signal
G500 Local Oscillator (VCO-Voltage Controlled Oscillator)
G502 26MHz Oscillator
N503 Regulating IC (Converts 5V to 3.8V with Control Signal of 2.8V
received as HAGAR Reset Control Signal from CPU
N100 COBBA IC Converts the incoming Rx Digital Signal to Rx Analog
Signal and similarly converts the outgoing Tx Analog signal to Tx
Digital Signal
Z503 GSM (900MHz) Tx Filter
N502 PA (Power Amplifier) for outgoing Tx Signal


(2) Logic Section
D300 CPU called MAD IC
D301 FLASH IC
D302 RAM IC
(3) UI (User Interface ) Section
N400 UI (User Interface) IC

(4) Power Supply Section
N200 Charging IC called CHAPS
N201 Power Controller IC called CCONT
X400 SIM Card Socket