In an ideal circuit, components only show their specified characteristics, not their parasitic ones. Also, PCB traces would have no resistance, inductance, or capacitance. In the real world however, this is not the case and PCB traces have parasitic properties that could severely influence precise current sensing signals. Having a good ground connection in PCB layouts is therefore a critical aspect of PCB design.
To help designers developing efficient PCBs, ADI Trinamic's engineers created Application Note 011, which contains a layout example to explain possible problems in PCB design. Please note that it's an example to explain the problems and should not be copied for designs. The example also does not include the necessary capacitors which must be placed as close to the IC as possible.