For sound to travel thousands of miles, it must first be converted into high-frequency radio waves. The information is encoded into a sinusoidal wave of billions of peaks per second, which is received and restored by the other phone. That's what RF devices do. The core component of the RF device is the power amplifier chip, also known as the RF chip.
< br >
Another core component of the radio frequency device is the filter, the filter can be mainly divided into surface acoustic wave (SAW) and sound wave (FBAR\/BAW) technology filter, the filter can remove the signal outside the target frequency band, is a very basic circuit device. The high-end filter is based on the principle of piezoelectric effect and introduces sound waves to work. Its base and coating are made of new materials (some of which are used in the best military radars) and are processed with high precision, involving film deposition and micromechanical processes.
< br >
Acoustic bulk wave (FBAR\/BAW) filters have significant performance advantages over acoustic surface wave (SAW) filters, allowing mobile phones and other communication devices to filter radio signals and improve call quality. Mainly used in mobile electronic devices such as mobile phones, tablets and GPS, it also has important applications on 5G. The technology filters incoming and outgoing wireless signals so that users receive and send only the specific communications they want to send. In addition to consumer applications, the technology is also used in a range of military and defense communications technologies.
The filter chip is a chip that provides filtering processing for the display signal in the mobile phone.
Take the filter chip on the n 70 mobile phone as an example, its chip pins, 1-10 and 16-25 are respectively connected, and 11-15 is the ground wire interconnection. The chip link method is the back of the pin mark facing the left side above, 1-21, 2-22, 3-23, 4-24, 5-25, 6-16, 7-17, 8-18, 9-19, 10-20, and the ground wire can be ignored.