In the analog circuit PCB Board, signal circuit can fulfill a variety of functions, such as signal input, feedback, output and provide standard signal. Therefore, refers to different applications, signal circuit must be optimized through different ways. However, there is an commonly known principle that in all the analog circuit PCB Board, signal circuit should be as short as possible, that is because the longer signal circuit, the more chances it can involve inductance and capacitor, that is the last thing PCB design engineer want to see. But the fact is impossible to make all the signal circuit to its shortest level. Therefore we have to take the most readily having interference signal circuit layout into account.

Below signal circuit layout need particular attention during PCB layout:

1> High frequency oscillator / amplifier;

2> Multi-level amplifier, especially with high output power;

3> High gain DC amplifier;

4> Minor signal amplifier;

5> Differential amplifier;

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