Typical Architecture of Mobile Phone

In general, a cell phone is composed of the following components:
• A Circuit board (Fig. 2.2)
• Antenna
• Microphone
• Speaker
• Liquid crystal display (LCD)
• Keyboard
• Battery



A typical mobile phone handset (Fig. 2.3) should include standard I/O devices (keyboard, LCD), plus a microphone, speaker and antenna for wireless communication. The Digital Signal Processor (DSP) performs the signal processing, and the micro-controller controls the user interface, battery management, call setup etc. The performance specification of the DSP is very crucial since the conversion has to take place in real time. This is why almost all cell phones contain such a special processor dedicated for making digital-to-analog (DA) and analog-to-digital(AD) conversions and real time processing such as modulation and demodulation etc. The Read Only Memory (ROM) and flash memory (Electrically Erasable and Programmable Memory) chips provide storage for the phone’s operating system(RTOS) and various data such as phone numbers, calendars information, games etc.

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