Interference Signal After Printed Wiring Card Reverse Engineering

Interference Signal is an important aspect of Printed wiring card Reverse engineering, Linear design is also one of the most important elements when design receiver. Due to the narrow line circuit system in the receiver, so the un-linear features is summaried by the intermodulation distortion measurement.

Which will involve the usage of two adjacent frequencies channels from reverse engineerin pcb board velocity measurement, and use the sinusoidal wave or cosine wave located in the central frequency band to drive the input signal, and then measure the product of the crossing adjustment. Generally speaking, SPICE is simulation software which will cost a lot of time and money, because it must execute multiple times of circular calculation to acquire the required frequency resolution ratio to understand the real distortion situation.

Interference from Adjacent Channels

Simulation is playing a critical role in the receiver. The un-linear features from output circuits of transmitter could probably spread the bandwidth of transmitting signal into adjacent channels. This phenomenon can be viewed as spectral regrowth. Before the signal achieve power amplifier of transmitter, and its bandwidth will be restricted; but the intermodulation distortion within PA will directly lead to increasing of bandwidth.

So if the bandwidth has been rise too much, transmitter will probably unable to match with the power requirement of adjacent channels. When conveying number convert the signals, it won’t be able to re-grow with predicted SPICE frequency spectrum. Approximate 1000 digitals symbol conveying activities must be simulated to represent the frequency spectrum, and will require to combine high frequency loaded wave to make the transient analysis after setup PCB reverse engineering.

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