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

Figure 4.

Figure 4

(a) Schematic diagram of gate-source voltage of the transmit amplifier and (b) voltage regulator (LM2931C); Equivalent circuit models of gate-source DC bias voltage of (c) transmit amplifier only (d) and transmit amplifier with dual-bias high-voltage circuit.