Understanding RF IC chips
RF: generally the part that sends and receives information.
Baseband: generally the part of information processing.
Power management: generally the power saving part, as cell phones are energy-limited devices, so power management is very important.
Peripherals: generally include LCD, keyboard, case, etc.
Software: generally includes system, driver, middleware, and application.
In the cell phone terminal, the most important core is the RF chip and the baseband chip. RF chip is responsible for RF transceiver, frequency synthesis, power amplification; baseband chip is responsible for signal processing and protocol processing. So what is the relationship between RF chip and baseband chip?
The relationship between RF chip and baseband chip
RF (Radio Frenquency) and baseband (Base Band) are from the English direct translation. The earliest application of RF is Radio - radio broadcasting (FM/AM), which is still the most classic application of RF technology and even radio field.
The base band is the band center point in the 0Hz signal, so the base band is the most basic signal. Some people also call the baseband "unmodulated signal", and this concept was once correct, for example, AM is a modulated signal (no modulation is needed, and the content can be read by the sounding component after reception).
But for modern communications, baseband signals are usually digitally modulated signals with a spectrum centered at 0Hz. And there is no clear concept that the baseband must be analog or digital, it all depends on the specific implementation mechanism.
To cut to the chase, the baseband chip can be thought of as including the modem, but not only the modem, but also the channel codec, source codec, and some signaling processing. The RF chip, on the other hand, can be seen as the simplest baseband modulation signal upconversion and downconversion.
The so-called modulation, is the need to transmit the signal, through certain rules modulated to the carrier wave above the project let after the radio transceiver (RF Transceiver) to send out, demodulation is the opposite process.
RF Transceiver IC recommended:
Working principle and circuit analysis
RF RF for short is RF current, is a high frequency AC change electromagnetic wave, for is the abbreviation of Radio Frequency, that can be radiated into space electromagnetic frequency, the frequency range between 300KHz ~ 300GHz. The alternating current that changes less than 1000 times per second is called low-frequency current, greater than 10000 times is called high-frequency current, and RF is such a high-frequency current. High frequency (greater than 10K); RF (300K-300G) is the higher frequency band of high frequency; microwave band (300M-300G) is also the higher frequency band of RF. RF technology is widely used in the field of wireless communication, cable TV system is the use of RF transmission.
RF chip refers to the radio signal communication into a certain radio signal waveform, and through the resonance of the antenna to send out an electronic component, it includes power amplifier, low noise amplifier, and antenna switch. RF chip architecture includes two major parts: receiving channel and transmitting channel.