A Class-J Power Amplifier Implementation for Ultrasound Device Applications

You, Kiheum; Kim, Seunghwan; Choi, Hojong

doi:10.3390/s20082273

Cited by 17 publications

(18 citation statements)

References 48 publications

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“…4, as reported in Figure 6. The sensitivity of the pulse-echo image rapidly decreases with the distance from the surface, as expected [40]. On the other hand, this effect is significantly less prominent for PuC.…”

Section: Resultssupporting

confidence: 75%

Ultrasonic Imaging of Thick Carbon Fiber Reinforced Polymers through Pulse-Compression-Based Phased Array

et al. 2021

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The use of pulse-compression in ultrasonic non-destructive testing has assured, in various applications, a significant improvement in the signal-to-noise ratio. In this work, the technique is combined with linear phased array to improve the sensitivity and resolution in the ultrasonic imaging of highly attenuating and scattering materials. A series of tests were conducted on a 60 mm thick carbon fiber reinforced polymer benchmark sample with known defects using a custom-made pulse-compression-based phased array system. Sector scan and total focusing method images of the sample were obtained with the developed system and were compared with those reconstructed by using a commercial pulse-echo phased array system. While an almost identical sensitivity was found in the near field, the pulse-compression-based system surpassed the standard one in the far-field producing a more accurate imaging of the deepest defects and of the backwall of the sample.

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Section: Resultssupporting

confidence: 75%

Ultrasonic Imaging of Thick Carbon Fiber Reinforced Polymers through Pulse-Compression-Based Phased Array

et al. 2021

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“…The maximum power of the transmitter-like generator can be delivered at the resonant frequency if the voltage and current of the generator are in phase [ 63 , 64 , 65 ]. After using matching circuits, the voltage and current of the generator in the same phase angles could be obtained to maximize the power transfer in the transmitter for the wireless system [ 66 , 67 , 68 , 69 ]. As shown in Figure 8 c, the peak-to-peak output voltage and current amplitudes of the generator with the matching circuit were 166 V and 1.12 A, respectively, at the resonant frequency.…”

Section: Resultsmentioning

confidence: 99%

Wireless Ultrasound Surgical System with Enhanced Power and Amplitude Performances

Kim

You

Choe³

et al. 2020

Sensors

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A wireless ultrasound surgical system (WUSS) with battery modules requires efficient power consumption with appropriate cutting effects during surgical operations. Effective cutting performances of the ultrasound transducer (UT) should be produced for ultrasound surgical knives for effective hemostasis performance and efficient dissection time. Therefore, we implemented a custom-made UT with piezoelectric material and re-poling process, which is applied to enhance the battery power consumption and output amplitude performances of the WUSS. After the re-poling process of the UT, the quality factor increased from 1231.1 to 2418 to minimize the unwanted heat generation. To support this UT, we also developed a custom-made generator with a transformer and developed 2nd harmonic termination circuit, control microcontroller with an advanced reduced instruction set computer machine (ARM) controller, and battery management system modules to produce effective WUSS performances. The generator with a matching circuit in the WUSS showed a peak-to-peak output voltage and current amplitude of 166 V and 1.12 A, respectively, at the resonant frequency. The performance with non-contact optical vibrators was also measured. In the experimental data, the developed WUSS reduced power consumption by 3.6% and increased the amplitude by 20% compared to those of the commercial WUSS. Therefore, the improved WUSS performances could be beneficial for hemostatic performance and dissection time during surgical operation because of the developed UT with a piezoelectric material and re-poling process.

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“…As a result, the outputs of the amplifier and BWE circuit-equipped amplifier were measured and compared. The voltage gain is a performance indicator for measuring the performance of an amplifier, and its high output helps to provide a clear ultrasound image [ 44 , 45 , 46 ]. In addition, the bandwidth of the gain over frequency of the amplifier only and the amplifier equipped with the BWE circuit can be compared.…”

Section: Methodsmentioning

confidence: 99%

Novel Bandwidth Expander Supported Power Amplifier for Wideband Ultrasound Transducer Devices

Kim

Choi

2021

Sensors

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Ultrasound transducer devices have their own frequency ranges, depending on the applications and specifications, due to penetration depth, sensitivity, and image resolution. For imaging applications, in particular, the transducer devices are preferable to have a wide bandwidth due to the specific information generated by the tissue or blood vessel structures. To support these ultrasound transducer devices, ultrasound power amplifier hardware with a wide bandwidth can improve the transducer performance. Therefore, we developed a new bandwidth expander circuit using specially designed switching architectures to increase the power amplifier bandwidth. The measured bandwidth of the power amplifier with the help of the bandwidth expander circuit increased by 56.9%. In addition, the measured echo bandwidths of the 15-, 20-, and 25-MHz transducer devices were increased by 8.1%, 6.0%, and 9.8%, respectively, with the help of the designed bandwidth expander circuit. Therefore, the designed architecture could help an ultrasound system hardware with a wider bandwidth, thus supporting the use of different frequency ultrasound transducer devices with a single developed ultrasound system.

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A Class-J Power Amplifier Implementation for Ultrasound Device Applications

Cited by 17 publications

References 48 publications

Ultrasonic Imaging of Thick Carbon Fiber Reinforced Polymers through Pulse-Compression-Based Phased Array

Ultrasonic Imaging of Thick Carbon Fiber Reinforced Polymers through Pulse-Compression-Based Phased Array

Wireless Ultrasound Surgical System with Enhanced Power and Amplitude Performances

Novel Bandwidth Expander Supported Power Amplifier for Wideband Ultrasound Transducer Devices

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