Which practice is considered poor grounding in signal circuits?

Grounding at both source and destination in signal circuits can lead to ground loops, which create multiple paths to ground. This can cause noise and interference in the signal, as different ground potentials may exist at the source and destination. A ground loop can result in the degradation of signal integrity and introduce unwanted variations in the data being transmitted.

The importance of proper grounding in signal circuits cannot be overstated; effective grounding practices aim to minimize interference and maintain signal fidelity. By ensuring that grounding is done correctly, one can prevent issues that arise from improper grounding techniques, such as floating signals or ground loops, which negatively affect the performance of electronic systems.