A discussion of the susceptibility of a brokaw bandgap to EMI

EMI Susceptibility Issue in Analog Front-End for Sensor Applications

“…For Brokaw and Kuijk bandgap circuits, a few topologies can be found in the literature [40][41][42][43][44], showing a low EMI susceptibility. Here, the basic topology is often improved by enhancing the EMI immunity of the operational amplifier, following the approaches depicted in Section 3, by changing the bandgap bias current and by introducing filter capacitors.…”

“…Here, the basic topology is often improved by enhancing the EMI immunity of the operational amplifier, following the approaches depicted in Section 3, by changing the bandgap bias current and by introducing filter capacitors. Layout and technological techniques to reduce the coupling between the power supply net and the poly resistors are also useful to increase the immunity to electromagnetic interferences [40].…”

On chip filtering versus layout techniques to reduce RF coupled disturbances

“…I S is the junction reverse saturation current and can be extracted from DC simulations or measurements. I n (x) represents the modified Bessel function of order n. Details are given in [1] and [4].…”

“…Bandgap circuits are very sensitive to RF disturbances which make their output voltage shift. It has already been investigated in the following analyses: [3], [4], [5] and [6]. A Brokaw bandgap was chosen to analyze the effects of capacitive couplings from an RF affected track to a very sensitive line of the circuit.…”