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. Author manuscript; available in PMC: 2012 Jun 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Aug;58(8):1658–1668. doi: 10.1109/TUFFC.2011.1993

Fig. 13.

Fig. 13

The measured and simulated input current noise of the TIA. The total theoretically calculated noise is also plotted along with the calculated feedback resistance noise and the calculated core amplifier noise. The measured 75 fA/√Hz feedback noise level at low frequencies is equivalent to the current noise of a 3 MΩ resistor.