- 1G: 1St Generation in Mobile Telephony.
- 2G: 2Nd Generation in Mobile Telephony.
- 3G: 3Rd Generation in Mobile Telephony.
- 4G: 4Th Generation in Mobile Telephony.
- AC: Alternate.
- BGA: Ball Grid Array.
- BSI: Battery Status Indicator.
- CDMA: Code
Division Multiple Access.
- CPU: Central Processing Unit.
- DCT: Digital Core Technology.
- DC: Direct Current.
- GSM: Global System for Mobile Communications.
- IMEI: International Mobile Equipment Identity.
- IC: Integrated Circuit.
- LED: Light Emitting Diode.
- PDA: Personal Digital Assistant.
- PFO: Power Frequency Oscillator.
- PCB.
- RAM: Random Access Memory.
- RF: Radio Frequency.
- ROM: Read Only Memory.
- RTC: Real Time Clock.
- RX: Receive / Receiver (Receiving Section).
- SMD: Surface Mount Device.
- TX: Transmit (Transmitting Section).
- UEM: Universal Energy Manager.
- VCO: Voltage-Controlled Oscillator.
1. Radio Frequency (RF Section)
2. The Analog Baseband Processor
3. And the Digital Baseband Processor.
2. The Analog Baseband Processor
3. And the Digital Baseband Processor.
Radio Frequency Processing Section
The RF section is the part of the cell-phone circuit is also known as RF Transceiver.
It is the section that transmit and receive certain frequency to a network and synchronize to other phone.
The RF - A radio section is based on two main Circuits.
1 Transmitter
2 Reciever
A simple mobile phone uses these two circuits to correspond to an other mobile phone. A Transmitter is a circuit or device which is used to transmit radio signals in the air.and a reciever is simply like radios which are used to receive transmissions(Radiation) which is spread in the air by any transmitter on a specific frequency.
The two way communication is made possible by setting two transmitters and two recievers sycronized in this form that a trasmitter in a cell phone is syncronised with the frequency of other cell phone's recieving frequency same like the transmitter of second cell phone is syncronised with the recieving frequency offirst cell phone. So first cell phone transmits its radiation in the air while the other phone listens it and same process is present in the opposit side. so these hand held two cell phones correspond to one another.
the technology used in these days is a little bit different but it is based on the basic theory prescribed before. the today's technology will be discussed in later on.
The RF section is the part of the cell-phone circuit is also known as RF Transceiver.
It is the section that transmit and receive certain frequency to a network and synchronize to other phone.
The RF - A radio section is based on two main Circuits.
1 Transmitter
2 Reciever
A simple mobile phone uses these two circuits to correspond to an other mobile phone. A Transmitter is a circuit or device which is used to transmit radio signals in the air.and a reciever is simply like radios which are used to receive transmissions(Radiation) which is spread in the air by any transmitter on a specific frequency.
The two way communication is made possible by setting two transmitters and two recievers sycronized in this form that a trasmitter in a cell phone is syncronised with the frequency of other cell phone's recieving frequency same like the transmitter of second cell phone is syncronised with the recieving frequency offirst cell phone. So first cell phone transmits its radiation in the air while the other phone listens it and same process is present in the opposit side. so these hand held two cell phones correspond to one another.
the technology used in these days is a little bit different but it is based on the basic theory prescribed before. the today's technology will be discussed in later on.
Analog Baseband Processor
A/D and D/A section
The analog
baseband processing section is composed of different types of circuits.
This section converts and process the analog to digital (A/D) signals and digital to analogsignals (D/A).
This section converts and process the analog to digital (A/D) signals and digital to analogsignals (D/A).
Control section
This is the
section acts as the controller of the the input and output of any analog and
digital signal.
Power Management
A power
management section in mobile phones is designed to handle energy matters that
is consumed in mobile phones. There are two main sub sections in a single power
section.
• Power Distribution and switching section
• Power Distribution and switching section
• Charging Section
A power
distribution section is designed to distribute desired Voltages and currenst to
the other sections of a phone. this section takes power from a battery (which
is figured commonly 3.6 Volts)and in some places it converts or step down to
various volts like 2.8 V 1.8V 1.6V etc.while on other place it also
steps up the voltage like 4.8 V. this section is commonly designed around a power IC(and integrated circuit) which is used to distribute and regulate the voltage used in other components.
The Charging section is based on a charging IC which takes power from an external source and gives it to battery to make it again power up when it is exhausted. this section uses convertibly 6.4 V from an external battery charger and regulates it to 5.8V wile giving it to battery. The battery is made charged by this process and it is ready to use for the next session (a battery session is a time which is provided by the manufacturer of a cell phone for standby by condition of a mobile phone or talk condition.)
Audio Codecs Section
steps up the voltage like 4.8 V. this section is commonly designed around a power IC(and integrated circuit) which is used to distribute and regulate the voltage used in other components.
The Charging section is based on a charging IC which takes power from an external source and gives it to battery to make it again power up when it is exhausted. this section uses convertibly 6.4 V from an external battery charger and regulates it to 5.8V wile giving it to battery. The battery is made charged by this process and it is ready to use for the next session (a battery session is a time which is provided by the manufacturer of a cell phone for standby by condition of a mobile phone or talk condition.)
Audio Codecs Section
This section
where analog and digital audio properties being process like the microphone,
earpiece speaker headset and ring-tones and also the vibrator circuits.
Digital Baseband Processor
This is the part where All
Application being process. Digital Baseband Processor section is used in mobile
phones to handle data input and ouput signal like switching, driving
applications commands and memory accessing and executing.
These are the parts and sections o
a Digital Baseband Circuit were installed.
CPU
CPU( Centeral Processing Unit) The Central Processing Unit (CPU) is responsible for interpreting and executing most of the commands from the users interface. It is often called the "brains" of the microprocessor, central processor, "the brains of the computer"
Flash and Memory Storage Circuits
*RAM( Random Access Memory)
*ROM,Flash(Read Only Memory
Interfaces such as the following were also part on this section:
*Blutooth
*Wi-fi
*Camera
*Screen Display
*Keypads
*USB
*SIM-Card
Here a typical overview of a block diagram on latest mobile phone designs.
CPU
CPU( Centeral Processing Unit) The Central Processing Unit (CPU) is responsible for interpreting and executing most of the commands from the users interface. It is often called the "brains" of the microprocessor, central processor, "the brains of the computer"
Flash and Memory Storage Circuits
*RAM( Random Access Memory)
*ROM,Flash(Read Only Memory
Interfaces such as the following were also part on this section:
*Blutooth
*Wi-fi
*Camera
*Screen Display
*Keypads
*USB
*SIM-Card
Here a typical overview of a block diagram on latest mobile phone designs.
Various mobile
phones have different concepts and design on every aspects, but the methods and
operational flow are all exactly the same. It differs on how and what certain
IC chips and parts they are being used and installed to a certain mobile phone
circuitry.
Identifying Spare
Parts on Mobile Phones Handsets
As part on this tutorials, A good technician must also learn how to identify spare parts and how each particular parts works on cellphone handsets. Familiarizing each
Now various brands and models of every mobile phone products although have the same parts but differs on each sizes and technical specs. Others also are compatible with each other..
The Following are the most common types of spare parts you can find inside mobile phones handsets.
* Battery
* Battery Connector
* Antenna
* LCD
* LCD Frame
* Camera Module
* Plug-in Connector
* Flex Cable Wires
* Navigator/Joystick/Trackball
* Touch Screen Panel
* Microphone
* Speaker
* Buzzer/Ringer
* Keypad Membrane
* Simcard Connector
* On/Off Switch
* Vibrator
* Back Housing
* Housing
A battery is used to provide power supply to the PCB circuits and components. There Are various types of Batteries in each particular mobile phone products, and varies to each sizes and specifications. Manufacturers coded each particular packaged according to sizes and where specified product to use. The standard battery Voltage Range is 3.7V and is made of rechargeable Lithium Ion.
