source:Industry News release time:2022-09-17 Article author:yu Popular:pcb
Conceptually, wireless transmitters and receivers can be divided into two parts: fundamental frequency and radio frequency. The fundamental frequency includes the frequency range of the input signal of the transmitter and the frequency range of the output signal of the receiver. The bandwidth of the fundamental frequency determines the fundamental rate at which data can flow in the system. The base frequency is used to improve the reliability of the data flow and reduce the load on the transmission medium (transmission medium) imposed by the transmitter under a specific data transmission rate.
Therefore, a lot of signal processing engineering knowledge is required when designing a fundamental frequency circuit on a PCB. The radio frequency circuit of the transmitter can convert and upconvert the processed baseband signal to the designated channel, and inject this signal into the transmission medium. Conversely, the receiver's RF circuitry can take the signal from the transmission medium and convert and down-convert it to the fundamental frequency.
The transmitter has two main PCB design goals:
They must emit a specific amount of power while consuming the least amount of power possible.
They must not interfere with the normal operation of transceivers in adjacent channels.
As far as receivers are concerned, there are three main PCB design goals: first, they must accurately reproduce small signals; second, they must be able to remove interfering signals outside the desired channel; and finally, like transmitters, they consume The power has to be small.
Large interference signal in RF circuit simulation
The receiver must be sensitive to small signals, even in the presence of large interfering signals (blockers). This occurs when trying to receive a weak or distant transmission while a nearby powerful transmitter is broadcasting on an adjacent channel. The interfering signal may be 60-70dB larger than the expected signal, and can block the reception of the normal signal by a large amount of coverage in the input stage of the receiver, or by causing the receiver to generate too much noise in the input stage. If the receiver is driven into the nonlinear region by the interferer during the input stage, the two problems mentioned above will occur. To avoid these problems, the front end of the receiver must be very linear.
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