Question

plot a simulation diagram of how a mobile phone works

Answer 1

RF PROCESSING SECTION:

The RF section is the part of the cell-phone circuit is also known as RF Transceiver.It is the section that transmits and receives certain frequencies to a network and synchronizes the same to another phone.A simple mobile phone uses these two circuits to correspond to another mobile phone.The RF - A radio section is based on two main Circuits:

1 Transmitter:A Transmitter is a circuit or device which is used to transmit radio signals in the air.

2 Reciever: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 receivers sycronized in such a way that a trasmitter in a cell phone is syncronised with the frequency of another cell phone's recieving frequency and vice versa. So, the first cell phone transmits its radiation in the air while the other phone listens for it. And the same process is present in the opposite side as well. So, these two hand-held cell phones correspond to one another - more or less simultaneously.

The technology used these days is a little bit different, but is based on the basic theory as used previously. Today's technology will be discussed 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 processes the analog to digital (A/D) signals and digital to analog (D/A) signals.

Control section :This is the section which 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 consumed in mobile phones. There are two main sub sections in a single power section.

• Power Distribution and switching section: A power distribution section is designed to distribute desired Voltages and currents to the other sections of a phone. This section takes power from a battery (which is figured commonly at 3.6 Volts) and in some places it converts or steps down to various volts like 2.8V, 1.8V, 1.6V etc., while in other places it also steps up the voltage to higher voltages like 4.8 V. This section is commonly designed around a power IC (integrated circuit) which is used to distribute and regulate the voltage used in other components.

• Charging Section: The Charging section is based on a charging IC which takes power from an external source and gives it to the battery to power it up again when it is exhausted. This section uses convertability of 6.4V from an external battery charger, and regulates it to 5.8V while giving it to the battery. The battery is 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 or talk time.) Please refer to the first diagram in this post as refeence.

Audio Codecs Section: This section is where analog and digital audio properties are processed - like the microphone, earpiece, speaker, headset, ring-tones, and also the vibrator circuits.

Digital Baseband Processor

This is the part where All Applications are process. Digital Baseband Processor section is used in mobile phones to handle data input and ouput signal like switching, driving application commands, and memory accessing and executing.

These are the parts and sections of a Digital Baseband Circuit:

CPU( Centeral Processing Unit): The Central Processing Unit (CPU) is responsible for interpreting and executing most of the commands from the user interface. It is often called the "brain" of the microprocessor, or the central processor.

Flash and Memory Storage Circuits

1.RAM( Random Access Memory)

2.ROM, Flash(Read Only Memory)

Interfaces such as the following are also part of this section:

1.Blutooth

2.Wi-fi

3.Camera

4.Screen Display

5.Keypads

6.USB

7.SIM-Card

This is just rough idea about the GSM mobile phone working.