Abstract: Grounding forms an inseparable part of all electronic and electrical designs, from circuit through system up to installation design. All the ground pins of the system should be tied to the analog ground plane, separated from the system’s digital logic ground, to achieve optimum performance in a mixed mode circuit. The ESD indirect discharge test is carried out to predict the effect of ESD on data in a mixed mode circuit when the analog and digital grounds are common and separate. The Indirect discharge is done for different voltages and distances. The susceptibility of a circuit to ESD can be greatly reduced by properly grounding it which is observed in the mixed mode circuit. In the mixed mode circuit the data is affected more by the ESD transients based on the discharge voltage given when the analog and digital grounds are common than when compared with the grounds being separate.