Mobile phone crystal 3.2*2.5mm 3225 26M (26.000MHZ)

The basic circuit of TCL mobile phone is shown in the figure. The mobile phone is a dual-band mobile phone, which can be automatically switched between GSM900M and DCS1800M according to the network conditions. The circuit is mainly composed of radio frequency, baseband and power supply circuits.
Radio frequency is Radio Frequency, usually abbreviated as RF. Indicates the electromagnetic frequency that can be radiated into space, with frequencies ranging from 300MHz to 30GHz. RF radio frequency is RF current, which is an abbreviation of high frequency AC change electromagnetic wave. An alternating current that changes less than 1000 times per second is called a low-frequency current, and a frequency of more than 10,000 times is called a high-frequency current, and a radio frequency is such a high-frequency current.
The baseband is the frequency band (frequency bandwidth) inherent to the original electrical signal that is not modulated (spectrum shifted and transformed) from the source (information source, also called the transmitting terminal).