The effects on a band gap voltage reference circuit of a radio frequency conducted disturbing signal superimposed to the supply voltage are evaluated. The variations of the dc output voltage are investigated for different frequency and amplitude of the interfering signal. A dedicated PCB for the measurements is developed paying attention to careful HF layout. Also, the impact of substrate currents on the IC’s behaviour is studied. The paper gives an analysis of the results obtained by measurements and simulation, focusing on the key macroscopic effects. A good agreement between simulations and measurements is found. At the end, a modified schematic based on simulation results is proposed to improve the immunity of the bandgap circuit.
Effects of RFI and Underground Currents on a Smart Power Bandgap Voltage Reference
SPIAZZI, GIORGIO;BUSO, SIMONE
2004
Abstract
The effects on a band gap voltage reference circuit of a radio frequency conducted disturbing signal superimposed to the supply voltage are evaluated. The variations of the dc output voltage are investigated for different frequency and amplitude of the interfering signal. A dedicated PCB for the measurements is developed paying attention to careful HF layout. Also, the impact of substrate currents on the IC’s behaviour is studied. The paper gives an analysis of the results obtained by measurements and simulation, focusing on the key macroscopic effects. A good agreement between simulations and measurements is found. At the end, a modified schematic based on simulation results is proposed to improve the immunity of the bandgap circuit.Pubblicazioni consigliate
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