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Increasing the immunity to electromagnetic interferences in a bandgap voltage reference

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4 Author(s)
Pretelli, A. ; Dept. of Electron.-DEA, Brescia Univ., Italy ; Richelli, A. ; Colalongo, L. ; Kovacs-Vajna, Zs.M.

In this paper a bandgap reference cell with low susceptibility to electromagnetic interferences is presented. The circuit, based on a classical architecture, is modified by using a symmetrical topology amplifier in the output stage leading to a robust electromagnetic immunity, still preserving good performances in the overall bandgap circuit. Results of the simulations, carried out on the circuit extracted from the layout, are reported and compared to a classical bandgap topology. The reference circuit exhibits a 1200 mV shift for interfering signals in the frequency range of 1 MHz-4 GHz, while the shift in the modified version of the same architecture is only 6 mV in the same frequency range.

Published in:

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on  (Volume:1 )

Date of Conference:

25-28 May 2003