1. In the analog layout, there are residual traces, which will form unexpected conductive paths, leading to signal interference or current leakage. It will destroy the normal work of the circuit and reduce the performance of the circuit.

2. Polysilicon residue refers to polysilicon residue, which exists in the analog layout and will have a negative impact on the performance of the circuit. The existence of polysilicon residue in the layout will lead to the change of electrical characteristics between circuit elements, thus affecting the performance of the whole circuit.