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Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

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Harmonic-Reduced Bias Circuit for Ultrasound Transducers.

¹Department of Electronic Engineering, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam 13120, Republic of Korea.

Sensors (Basel, Switzerland)

|May 13, 2023

Summary

A new bias circuit significantly reduces harmonic signals in class-C power amplifiers. This innovation enhances output voltage, improving performance for sensitive ultrasound instruments.

Keywords:

harmonic-reduced bias circuit ultrasound instrument ultrasound transducer

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Area of Science:

Electrical Engineering
Signal Processing

Background:

Class-C power amplifiers require high-amplitude input signals, which can generate unwanted harmonic signals.
Lower gain in class-C amplifiers compared to class-A necessitates higher input voltages, exacerbating harmonic distortion.

Purpose of the Study:

To propose and validate a novel bias circuit for suppressing harmonic signals in class-C power amplifiers.
To enhance the output voltage amplitude and overall performance of class-C power amplifiers.

Main Methods:

A harmonic-reduced bias circuit was designed and implemented.
Input harmonic signals were measured at various frequencies (25-100 MHz) for both the proposed and conventional voltage divider bias circuits.
Pulse-echo measurements were conducted to compare the performance of piezoelectric transducers using both bias circuits.

Main Results:

The harmonic-reduced bias circuit demonstrated significantly lower input harmonic signal levels compared to the voltage divider bias circuit across tested frequencies.
Pulse-echo measurements showed a higher peak-to-peak echo amplitude (27.07 mV vs. 18.55 mV) and bandwidth (37.19% vs. 22.71%) with the proposed bias circuit.
The proposed circuit effectively suppressed harmonic signals, leading to improved output voltage amplitudes.

Conclusions:

The novel bias circuit effectively suppresses harmonic signals in class-C power amplifiers.
The improved performance, evidenced by higher echo amplitude and bandwidth, suggests the proposed scheme is beneficial for ultrasound instruments, particularly those requiring high sensitivity.