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. 2018 Nov 30;18(12):4210. doi: 10.3390/s18124210

Figure 7.

Figure 7

Block diagram of pulse-echo test measurement system when using (a) transmit amplifier only and (b) transmit amplifier with dual-bias high-voltage circuit, (c) spectrum data of echo signal generated by a 1 MHz immersion ultrasound transducer with transmit amplifier with dual-bias high-voltage circuit at 10 V DC bias voltage, and (d) HD2, HD3, HD4 and THD values with and without dual-bias high-voltage linearizer vs. 0.8 V, 5 V, 10 V, 15 V and 20 V DC bias voltages (graph with dash, dot, dash-dot and solid mark represent HD2, HD3, HD4, and THD of the transmit amplifier with dual-bias high-voltage circuit, respectively). HD2 w/o, HD3 w/o, HD4 w/o, THD w/o represent the measured HD2, HD3, HD4, and THD of the echo signals when using transmit amplifier only, respectively.