Hexagonal Stimulation Digital Controller Design and Verification for Wireless Subretinal Implant Device

Abbasi, Wajahat H.; Choi, Hojong; Kim, Jungsuk

doi:10.3390/s22082899

Cited by 3 publications

(4 citation statements)

References 24 publications

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“…where I drain , θ conduction , and V drian are the drain current, conductance angle, and drain voltage of the transistor. R Load is the load impedance of the oscilloscope, and i output and V input are the output current and input voltage of the class-C power amplifier with bias circuits, respectively The static and dynamic power consumption (P C ) of the class-C power amplifier with bias circuits is represented in Equation ( 11) [84][85][86]. In a class-A power amplifier, power consumption can be obtained by multiplying the supply voltage by the output current.…”

Section: Equivalent Circuit Analysis Of Bias Circuitsmentioning

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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Section: Equivalent Circuit Analysis Of Bias Circuitsmentioning

confidence: 99%

Harmonic-Reduced Bias Circuit for Ultrasound Transducers

Choi

2023

Sensors

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“…With the rapid development of the integrated circuit production industry, more and more third-part intellectual property (IP) cores are used to form systems on chips (SoCs) in an integrated circuit design process [1]. However, this design mode has attracted the attention in security fields due to hardware Trojans [2] inserted in third-party IPs.…”

Section: Introductionmentioning

confidence: 99%

Hardware Trojan Detection Using Effective Property-Checking Method

Zhang

Zhao

et al. 2022

Electronics

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Hardware Trojans refer to additional logic maliciously implanted by attackers in integrated circuits (ICs). Because of the potential security threat of hardware Trojans, they have attracted extensive attention to security issues. As a formal verification method, property checking has been proved to be a powerful solution for hardware Trojan detection. However, existing property-checking methods are limited by the unity of security properties and the model explosion problem of formal models. The limitations above hinder the practical applications of these methods. To alleviate these challenges, we propose an effective property-checking method for hardware Trojan detection. Specifically, we establish the formal model based on the principle of finite state machine (FSM), and the method can alleviate the model explosion problem. For property writing, we extract the core behavior characteristics of hardware Trojans and then generate properties for the verification of certain types of hardware Trojans. Experimental results demonstrate that our approach is applicable to detect information leakage and denial of service (DoS) hardware Trojans by verifying security properties.

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“…In recent years, numerous studies have demonstrated the beneficial effects of administering appropriate electrical stimulation to humans, such as for treating diseases, reducing pain, and replacing the function of existing nerves [ 1 , 2 , 3 , 4 ]. To provide a glimpse into the ongoing research on electrical stimulation, we introduce several examples of spinal cord stimulation and retina prosthesis research.…”

mentioning

confidence: 99%

“…Moreover, in the event of abnormal reception, the receiver is designed to stop functioning until successful reception is achieved. On the other hand, Abbasi W. et al presented an economical and configurable wireless communication system that uses field-programmable gated arrays (FPGAs) to address the design challenges associated with retinal implantation [ 3 ]. This system utilizes hexagonal biphasic stimulation pulses that are generated by a digital controller, which can be fully controlled using an external transmitter.…”

mentioning

confidence: 99%