Basic slideshow about Mobile phones.

1. Created By – Charith
Thambavita
THE MOST FRIENDLY
TECHNOLOGY IN THE
21ST CENTURY

3. The History Of Mobile Phones

4. Block Diagram Of Gsm Mobile Phones

5. RF PART
• Every mobile phone have RF frequency up and Rf
Frequency down converter
• up converter converts modulated baseband signal
• RF down converter converts RF signal to baseband
signal

6. Antenna And Rx/Tx Switch
• Antenna is the metallic object which
converts electro-magnetic signal to
electric signal and vice versa
• Commonly used helix type, planar
inverted F type, whip or patch type
antennas
• Micro strip based patch type of antennas
are popular

7. Tx/Rx Switch
• Tx/Rx Switch is used to connect both Tx path and Rx
path with antenna at different times.
• Tx/Rx Switch is controlled automatically by DSP based
on GSM frame structure
Baseband Part
• This part basically converts voice/data to be carried
over GSM air interface to I/Q baseband signal.

8. ADC & DAC
• GSM mobile phone to make it work with GSM
network/base station.
Protocols
• ADC(Analog to Didital Converter) & DAC(Digital to
Analog Converter) is used to convert analog speech
signal to Digital signal & vise versa in the mobile.

9. Application
• It also runs on CPU. various
applications run in GSM mobile
phone. It include audio,video
and image/graphics
applications.

10. Operating System
• various operating systems
are supported in mobile
phone such as
Symbian,java,android,RT-
Linux,Palm.

11. Connectivity
• To make data transfer fast between mobile phone
and other computing devices (laptop, desktop,
tablet) various technologies are evolved which
include WLAN, Bluetooth,USB.
• GPS(global positioning system) is used for location
assistance and will enable google map to work
efficiently.

12. Battery
• Major source of power to make/to
keep mobile phone functional.
• various types of batteries made of
Nickel Cadmium(NiCd),Nickel Metal
Hydride(NiMH), based on lithium,Li-
ion and so on.

13. Microphone
• Microphone or mic converts air
pressure variations(result of our
speech) to electrical signal.
• condenser,dynamic,carbon or ribbon
are various mic types used in mobile
phones.

14. Speaker
• It converts electrical signal to audible signal(pressure
vibrations) for human being to hear.

15. Camera
• Mobile phone camera feature is available for one
to click pictures at various occasions.
• It is the major specifications in increasing cost of
mobile phone.

16. Display
• Display is the intermediate component
• LCD(liquid crystal display), TFT(Thin-film transistor)
screen,OLED(organic light emitting diode),TFD(thin
film diode), touch screen of capacitive and resistive
type are various types of displays.

17. Keypad
• Earlier days keypad was simple matrix type keypad
which contains numeric digits
• Now days keypad has been removed from the phone
design and it has become part of mobile phone
software. It pops on the display screen itself which can
be operated by user using touch of a finger tip.

18. Advantages Of Mobile Phones
• Helpful in emergency.
• Texting
• Improve Communication Skills
• Connecting People
• Use for internet
• Find your destination with GPS

19. 5 FACTS ABOUT MOBILE PHONES

20. Do You Know…??
• Your mobile phone has more computing power than
the computers used for the Apollo 11 moon landing.

21. Do You Know…??
• More people in the world have mobile phones than
toilets

22. Do You Know…??
• Nomophobia is the fear of being without your mobile
phone or losing your signal.

23. Do You Know…??
• Over 250 million Nokia 1100 devices were sold,
making it the bestselling electrical gadget in history.

24. Do You Know…??
• The average person unlocks his or her smartphone
110 times each day.

25. THE END