Novel Bandwidth Expander Supported Power Amplifier for Wideband Ultrasound Transducer Devices

Kim, Kyeongjin; Choi, Hojong

doi:10.3390/s21072356

Cited by 7 publications

(5 citation statements)

References 70 publications

(93 reference statements)

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“…However, typical inverse Class-E power amplifiers with high signal distortions have been used in low-power communication systems [ 46 ]. Ultrasound systems typically work with low signal distortions at high voltages [ 47 , 48 , 49 , 50 ]. In particular, high linearity for acoustic stimulation applications is desirable.…”

Section: Introductionmentioning

confidence: 99%

An Inverse Class-E Power Amplifier for Ultrasound Transducer

Choi

2023

Sensors

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An inverse Class-E power amplifier was designed for an ultrasound transducer. The proposed inverse Class-E power amplifier can be useful because of the low series inductance values used in the output matching network that helps to reduce signal distortions. Therefore, a newly designed Class-E power amplifier can obtain a proper echo signal quality. The measured output voltage, voltage gain, voltage gain difference, and power efficiency were 50.1 V, 22.871 dB, 0.932 dB, and 55.342%, respectively. This low voltage difference and relatively high efficiency could verify the capability of the ultrasound transducer. The pulse-echo response experiment using an ultrasound transducer was performed to verify the capability of the proposed inverse Class-E power amplifier. The obtained echo signal amplitude and pulse width were 6.01 mVp-p and 0.81 μs, respectively. The −6 dB bandwidth and center frequencies of the echo signal were 27.25 and 9.82 MHz, respectively. Consequently, the designed Class-E power amplifier did not significantly alter the performance of the center frequency of the ultrasound transducer; therefore, it could be employed particularly in certain ultrasound applications that require high linearity and reasonable power efficiency.

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Section: Introductionmentioning

confidence: 99%

An Inverse Class-E Power Amplifier for Ultrasound Transducer

Choi

2023

Sensors

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“…In this paper, previous research is reviewed for different types of piezoelectric transducer applications. A class-D power amplifier was developed to generate 2 kW of output power, resulting in better signal quality with a power piezoelectric load [17][18][19]. A class-D amplifier was developed to generate a maximum output voltage of 125 V rms for a dielectric elastomer transducer [20].…”

Section: Introductionmentioning

confidence: 99%

Harmonic-Reduced Bias Circuit for Ultrasound Transducers

Choi

2023

Sensors

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The gain of class-C power amplifiers is generally lower than that of class-A power amplifiers. Thus, higher-amplitude input voltage signals for class-C power amplifiers are required. However, high-amplitude input signals generate unwanted harmonic signals. Therefore, a novel bias circuit was proposed to suppress the harmonic signals generated by class-C power amplifiers, which improves the output voltage amplitudes. To verify the proposed idea, the input harmonic signals when using a harmonic-reduced bias circuit (−61.31 dB, −89.092 dB, −90.53 dB, and −90.32 dB) were measured and were found to be much lower than those when using the voltage divider bias circuit (−57.19 dB, −73.49 dB, −70.97 dB, and −73.61 dB) at 25 MHz, 50 MHz, 75 MHz, and 100 MHz, respectively. To further validate the proposed idea, the pulse-echo measurements were compared using the bias circuits. The peak-to-peak echo amplitude and bandwidth of the piezoelectric transducer, measured when using a harmonic-reduced bias circuit (27.07 mV and 37.19%), were higher than those achieved with a voltage divider circuit (18.55 mV and 22.71%). Therefore, the proposed scheme may be useful for ultrasound instruments with low sensitivity.

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“…Recently, ultrasound systems are widely used to evaluate the performances such as pulse-echo responses and cell responses [1]. The systems are composed of the transmitter and receiver with transducers [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Novel dual-resistor-diode limiter circuit structures for high-voltage reliable ultrasound receiver systems

Choi¹

2022

THC

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BACKGROUND: The limiters have been used to protect the ultrasound receivers because of the inherent characteristic of the transducers which are required to use the high voltage excitation to obtain the reasonable echo signal amplitudes. OBJECTIVE: Among the variety of the limiters, the performances of discharge voltage degradation from the limiters gradually deteriorate the whole ultrasound systems according to the applied voltages of the ultrasonic transducers. This could cause the ultrasound systems to be unreliable for the long-term operations, resulting in possibly breaking the receiver systems. METHODS: Designed limiters were evaluated with insertion loss, total harmonic distortion, and pulse-echo responses with the ultrasound transducer devices. RESULTS: Designed new dual-resistor-diode limiters exhibited greater and faster suppression of the pulse width (1.15 V and 6.1 μs) for high-voltage signals. CONCLUSIONS: Our proposed dual-resistor-diode limiter could be one of the potential candidates for reliable ultrasound receiver system.

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Novel Bandwidth Expander Supported Power Amplifier for Wideband Ultrasound Transducer Devices

Cited by 7 publications

References 70 publications

An Inverse Class-E Power Amplifier for Ultrasound Transducer

An Inverse Class-E Power Amplifier for Ultrasound Transducer

Harmonic-Reduced Bias Circuit for Ultrasound Transducers

Novel dual-resistor-diode limiter circuit structures for high-voltage reliable ultrasound receiver systems

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