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. Author manuscript; available in PMC: 2014 Jan 28.
Published in final edited form as: IEEE Trans Biomed Circuits Syst. 2013 Apr;7(2):115–128. doi: 10.1109/TBCAS.2013.2255874

Fig. 9.

Fig. 9

(a) The preamplifier input ESD protection circuit I-V before and (b) after Class 1A, (c) Class 1B, and (d) Class 1C ESD Testing. Results show that when the ESD protection circuit is intact, the forward and reverse biased conducting resistances are small with values around 7Ω and 50Ω at large bias voltages respectively.