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Anonymous users2024-02-06Rectangular shape, hit **, send a message, don't be casual.
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Anonymous users2024-02-05The basic structure of a mobile phone can be divided into three parts:
RF section. The radio frequency part generally refers to the radio frequency reception and radio frequency transmission part of the mobile phone, and the main circuits include antennas, antenna switches, receiving filters, high-frequency amplification, receiving local oscillators, mixing frequency, intermediate frequency, transmitting local oscillators, power amplifier control, etc. Logical audio section.
The audio processing part sends the audio processing process, and the voice signal from the microphone is transformed, encoded and modulated after being amplified by the audio amplification integrated module, and the RXI and RXQ signals output from the intermediate frequency are sent to the modem for demodulation, and then the channel is decoded and sent to the audio amplification integrated module for amplification, and the mobile phone radio frequency, audio part and peripheral display, listening, language transmission, plug-in card and other parts are all under the unified command of logic control to complete their respective functions. Input and output interfaces.
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Anonymous users2024-02-04Hardware Structure:
Motherboard, Display, Button Set, Antenna, Battery, Enclosure Some non-essential components such as cameras are also included.
Circuit structure: The structure of the mobile phone can be divided into three parts, namely the RF processing part, the logic audio part and the input and output interface part.
RF section. The RF part generally refers to the radio frequency receiving and RF transmission part of the mobile phone, and the main circuits include: antenna, antenna switch, receiving filter, high-frequency amplification, receiving local oscillator, mixing, intermediate frequency, transmitting local oscillator, power amplifier control, power amplifier, etc.
a) Send part.
The emission part includes bandpass filtering, intermediate frequency, transmit local oscillator, RF power amplifier, transmit filter, antenna switch, antenna, etc.
b) Receiving part.
The receiving part includes antennas, antenna switches, high-frequency filtering, high-frequency amplification, mixing, intermediate frequency filtering and intermediate frequency amplification circuits. The received signal is processed layer by level, and finally the audio signal that pushes the earpiece to produce sound is obtained.
Most of the demodulation is completed in the intermediate frequency processing integrated circuit (IC), and after demodulation, an analog in-phase quadrature signal with the same frequency is obtained, and then enters the logic audio processing part for post-stage processing.
Logical audio section.
It includes both logical processing and audio processing.
a) Audio processing part.
1. Send the audio processing process. The voice signal from the microphone is amplified by the audio amplification integrated module for AD conversion, voice coding, channel coding, modulation, and finally sent to the RF transmission part for further processing.
2 Receiving audio processing. The RXI and RXQ signals output from the intermediate frequency are sent to the modem for demodulation, and then the channel is decoded, D A is converted, and then sent to the audio amplification integrated module for amplification. Finally, the amplified audio signal is used to propel the earpiece to make sound.
2) Logical processing part.
The radio frequency, audio part and peripheral display, listening, voice transmission, card insertion and other parts of the mobile phone are all under the unified command of logic control to complete their respective functions. By analyzing the flow direction of the control lines in the three lines mentioned above, it is possible to understand how the logic part controls the function of each part.
Input and output interface sections.
The input and output interface part mainly refers to the display, button, ringing, listening, phone delivery, card holder, etc., also known as the interface part.
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