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. Author manuscript; available in PMC: 2013 Mar 6.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Dec;58(12):2620–2630. doi: 10.1109/TUFFC.2011.2125

Fig. 2.

Fig. 2

The characteristics of the combination of the pre-amplifiers: (a) gain distribution versus the frequency, (b) noise figure distribution versus frequency.