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. 2020 Apr 16;20(8):2273. doi: 10.3390/s20082273

Figure 13.

Figure 13

(a) First echo signals from a class-J power amplifier with an input voltage of 3 VP-P and input frequency of 25 MHz; (b) second echo signals from a class-J power amplifier with an input voltage of 3 VP-P and input frequency of 25 MHz.