Wireless, miniaturized, semi-implantable electrocorticography microsystem validated in vivo

Keramatzadeh, Keivan; Kiakojouri, Ali; Nahvi, Mohammad Sadegh; Khazaei, Yousef; Feizi-nejad, Ali; Maghami, Mohammad Hossein; Mohammadi, Reza Karami; Sharifshazileh, Mohammadali; Nasiri, Soraya; Boroumand, Farhad Akbari; Nadimi, Ebrahim; Rezaei, Mahmoud; Shojaei, Amir; Mirnajafi‐Zadeh, Javad; Sodagar, Amir M.

doi:10.1038/s41598-020-77953-8

Cited by 9 publications

(2 citation statements)

References 33 publications

(43 reference statements)

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“…The proposed LS is allowed to work only during the PD; therefore, the integral bounds of ( 6) are from t0 to t0+tpr, where t0 indicates the exact start time of the LS input signal (IN) going up and t0+tpr indicates the moment that VA reaches VM. Thus, replacing VA by VM in (6) and evaluating this integral over the rising PD tpr yields (7) Which can be approximated using Simpson's rule (8) Replacing dt by a time interval ∆t in (3) yields (9) where ∆𝑉 𝐴 is the variation of VA over the time interval ∆t. The value of Cp is determined by (10) In (10), the value of iSDMP2 depends on the region of operation of MP2.…”

Section: Cdmp4=cdsmp4+cdgmp4mentioning

confidence: 99%

A 7.6-ns Delay Subthreshold Level-Shifter Leveraging a Composite Transistor and a Voltage-Controlled Current Source

et al. 2022

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A novel level shifter (LS) circuit that uses a new low-power approach based on a parasitic capacitance voltage controlled current source is presented to minimize the propagation delay (PD) and maximize the voltage conversion range. This new scheme uses a simplified circuit including a dependent current source, a composite transistor made of three interconnected n-channel MOSFETs (TnM), one CMOS input inverter, and one CMOS output buffer to provide a fast response time. The circuit utilizes the combined action of the equivalent parasitic capacitance of the TnM, the value of which changes dynamically according to the transient value of the input voltage, and the dependent current source to shift the input signal level up from subthreshold voltage levels to +3.0 V, with minimal delay and power consumption. The LS circuit fabricated in 0.35 µm CMOS technology occupies a silicon area of only 25 µm×25 µm. The LS shows measured rising and falling PDs of, respectively, 4 and 11.2 ns. The measured results show that the presented circuit outperforms other solutions over a wide frequency range of 1 to 130 MHz. The fabricated circuit consumes a static power 31.5 pW and a dynamic power of 3.4 pJ per transition at 1 kHz, VDDL=0.8 V, and a capacitive load of CL=0.1 pF.

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Section: Cdmp4=cdsmp4+cdgmp4mentioning

confidence: 99%

A 7.6-ns Delay Subthreshold Level-Shifter Leveraging a Composite Transistor and a Voltage-Controlled Current Source

et al. 2022

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“…Wireless power transfer (WPT) has been widely used in various applications, such as charging portable devices, electric vehicles, renewable energy resources, and implantable medical devices (IMDs), including retinal prostheses, cochlear implants, and neural recording microsystems [1][2][3][4][5][6]. The WPT system can effectively transmit power from the source to the targeted moving device by electromagnetic induction with a lack of radiation.…”

Section: Introductionmentioning

confidence: 99%

A 13.56 MHz Low-Power, Single-Stage CMOS Voltage-Boosting Rectifier for Wirelessly Powered Biomedical Implants

2023

Self Cite

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In this paper, a low-power, single-stage, active rectifier based on a new charge-pump circuit is presented to be used in biomedical implants. The proposed circuit not only rectifies the AC input voltage to a DC voltage but also amplifies the DC output voltage to a higher level. Low-loss MOS switches are used in the structure of the designed circuit to provide high power conversion efficiency. In addition, by using two comparators, the reverse leakage current is somehow eliminated, resulting in a higher increase in the power efficiency. By tying the source and bulk terminals of the utilized transistors, the body effect problem has been solved, and by connecting the p-substrate to the ground, which is the lowest voltage in the circuit, the latch-up phenomenon is eliminated without any extra circuit. The proposed rectifier is implemented and post-layout simulated in a 0.18 µm standard CMOS technology. According to the simulation results, 1.205 V output DC voltage is achieved from an AC input signal with the peak-to-peak amplitude of 1 V at the operating frequency of 13.56 MHz with a 3 kΩ load resistance. The total active area of the designed circuit is 0.167 mm2 with a maximum power conversion efficiency of 98.2%, output power in the range of 0.5–1.5 mW, and voltage conversion ratio of 120%.

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Wireless Power and Data Transfer Technologies for Flexible Bionic and Bioelectronic Interfaces: Materials and Applications

Mariello,

Proctor

2024

Adv Materials Technologies

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The next‐generation bionics and, more specifically, wearable and implantable bioelectronics require wireless, battery‐free, long‐term operation and seamless bio‐integration. Design considerations, materials choice, and implementation of efficient architectures have become crucial for the fabrication and deployment of wireless devices, especially if they are flexible or soft. Wireless power and data transfer represent key elements for the development of robust, efficient, and reliable systems for health monitoring, advanced disease diagnosis and treatment, personalized medicine. Here, the recent advances in materials and technologies used for wireless energy sourcing and telemetry in bio‐integrated flexible bionic and bioelectronic systems are reviewed. The study tackles different challenges related to mechanical compliance, low thickness, small footprint, biocompatibility, biodegradability, and in vivo implementation. The work also delves into the main figures of merit that are mostly adopted to quantify the wireless power/data transfer performances. Lastly, the pivotal applications of wearable and implantable wireless bionics/bioelectronics are summarized, such as electrical stimulation/recording, real‐time monitoring of physiological parameters, light delivery trough optical interfaces, electromechanical stimulation via ultrasounds, highlighting their potential for future implementation and the challenges related to their commercialization.

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Wireless, miniaturized, semi-implantable electrocorticography microsystem validated in vivo

Cited by 9 publications

References 33 publications

A 7.6-ns Delay Subthreshold Level-Shifter Leveraging a Composite Transistor and a Voltage-Controlled Current Source

A 7.6-ns Delay Subthreshold Level-Shifter Leveraging a Composite Transistor and a Voltage-Controlled Current Source

A 13.56 MHz Low-Power, Single-Stage CMOS Voltage-Boosting Rectifier for Wirelessly Powered Biomedical Implants

Wireless Power and Data Transfer Technologies for Flexible Bionic and Bioelectronic Interfaces: Materials and Applications

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