Susceptibility of Operational Amplifiers to Conducted EMI Injected Through the Ground Plane into Their Output Terminal

A Comprehensive Comparison of EMI Immunity in CMOS Amplifier Topologies

“…Recently, it has been stated that the scenario for EMI pollution can be simplified in two cases: the classic one in which the interference is directly injected into the pins of the inputs and of the power supply; and the newest, in which the EMIs are also coupled from the printed circuit board (PCB) ground plane and, consequently, the output pin can also be a point of injection [16,17]. In practical PCB designs, indeed, the ground plane is commonly shared with other analog, digital, or mixed-signal circuits and ICs, which can be a source of high-frequency signals and, therefore, of interference.…”

“…Regarding the classic scenario, several studies have investigated opamp susceptibility, and many various topologies with a better EMI immunity have been presented in recent years [18][19][20][21][22]. Instead, with regard to the second scenario, research is only beginning, and the main result is the measurement of the susceptibility of commercial devices to the interferences capacitively coupled to the ouput pin [16,17].…”

Electromagnetic Susceptibility of Battery Management Systems’ ICs for Electric Vehicles: Experimental Study

“…A battery management system (BMS) IC manages the state of charge of the battery pack, protecting it from operating outside its safe operating conditions [8][9][10][11][12][13]. Electromagnetic interference can be easily picked up by the long wires that connect BMS front-end ICs to each other, to the BMS control unit, to the terminals of the electrochemical cells and to the temperature sensors, which are spatially distributed over the whole battery pack module [14], and can easily impair the operation of data acquisition circuits [15][16][17][18].…”

EMI Susceptibility of the Output Pin in CMOS Amplifiers

“…Indeed in [17], the interferences reach the IC (a Local Interconnect Network (LIN) integrated output driver) by means of a parasitic capacitive coupling between the output pin and the conductive ground plane. The unwanted RF signals may indeed be transmitted through the copper plane, often shared with other analog, digital or mixed ICs, and can be capacitively coupled to all the pins, including the output one [18][19][20]. Precisesly, the susceptibility of the Operational Amplifiers to the Electromagnetic Interferences capacitively coupled to the ouput pin has been demonstrated in recent works [18][19][20], involving both commercial amplifiers and custom CMOS integrated ones.…”