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. 2019 Nov 29;19(23):5252. doi: 10.3390/s19235252

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© 2019 by the author.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Measurement setup schematic diagram and picture of the pulse-echo response using the class-B amplifier with bias circuits; (b) echo amplitude and (c) spectrum variance when using the class-B amplifier with resistor divider and stacked transistor bias circuits; echo amplitude versus time when using class-B amplifiers with (d) resistor divider and (e) stacked transistor bias circuits; echo spectrum versus frequency when using class-B amplifiers with (f) resistor divider and (g) stacked transistor bias circuits.

(a) Measurement setup schematic diagram and picture of the pulse-echo response using the class-B amplifier with bias circuits; (b) echo amplitude and (c) spectrum variance when using the class-B amplifier with resistor divider and stacked transistor bias circuits; echo amplitude versus time when using class-B amplifiers with (d) resistor divider and (e) stacked transistor bias circuits; echo spectrum versus frequency when using class-B amplifiers with (f) resistor divider and (g) stacked transistor bias circuits.