A simple and scalable method to fabricate a novel high-energy asymmetric supercapacitor using tomato-leaf-derived hierarchical porous activated carbon (TAC) electrochemically deposited polyaniline (PANI) for battery-free heart-pulse-rate monitor is reported. In this study, TAC prepared by pyrolysis, exhibiting nanosheet-type morphology high specific surface area of ≈1440 m2 g-1 , PANI onto cloth. The TAC- PANI- based demonstrates an electrochemical performance superior that symmetric...

This letter generalizes the fundamental limit theory in switched-capacitor (SC) converters. The proposed 1995 sets voltage-gain-ratio (VCR) boundaries for a specific number of k flying capacitors SC converter. Although this is valid positive VCR, another condition must be satisfied negative VCR. Moreover, only proved using single-input single-output converters, whereas multiple-input multiple-output (MIMO) converter implementation desirable some applications. Therefore, extends to include...

This article presents an end-to-end microwave-based system to detect the glucose level in aqueous solutions through a noninvasive scheme. A microwave signal is generated and transmitted sample under test (i.e., glucose–water solution). The received then conditioned using low-noise amplifier (LNA), bandpass filter (BPF), RF detector. change dc output voltage on receiver side used as new way level. proposed sensor implemented two microstrip patch antennas that resonate at 5.7 GHz are...

Powerline interference is one of the most dominant problems in detection and processing biopotential signals. This work presents a new fully integrated notch filter exhibiting high linearity low power consumption. High preserved utilizing active-RC approach while IC implementation achieved through replacing passive resistors by R-2R ladders achieving area saving approximately 120 times. The design optimized for operation using an efficient circuit topology ultra-low operational amplifier....

Switched-capacitor converter (SCC) features a compact solution due to its magnetic-less structure, which fulfills the high density requirement in low power applications. Compared other SCC topologies, Fibonacci switched-capacitor (FSC) utilizes least number of flying capacitors perform any voltage conversion. This paper proposes monolithic voltage-scalable FSC, can be used energy harvesting The challenges implement on-chip FSC are addressed. parasitic charge loss is substantial FSC....

This work presents a near-infrared spectroscopy-based technique to measure the glucose concentration in an aqueous solution. A light source sends optical energy through glucose-water The transmitted solution is received by photodetector and conditioning circuit that includes operational amplifier low-pass filter remove high-frequency noise. intensity converted DC voltage found be inversely proportional experimental results for range of 0-4000 mg/dL confirm expected theoretical behavior....

Synthesizing the switched-capacitor (SC) converter to perform certain voltage conversions is considered a challenge in SC design. This paper presents systematic approach synthesize an optimal for multiple voltage-gain-ratio (VCR) applications. The optimization methodology based on minimum number of components, i.e. capacitors and switches. exploits canonical model presented [8] which ensures that using Fibonacci fundamental limit. Moreover, method this paper, controller circuit designed...

Low frequency continuous time filters are essential analog blocks for biomedical applications.Integrating such having large constants is difficult as it requires component values.A novel approach to scale down the pole presented.A 5-bit reduction in cut off achieved.This made possible through adding a passive resistor forward path of op-amp based integrator introducing difference term frequency.Also, filter topology modified avoid changing quality factor.As an example, 2 nd order low pass...

This study describes a non-invasive method for measuring the glucose level in aqueous solutions using microwave-based system. The test sample (i.e., glucose-water solution) is subjected to microwave signal. Two RF microstrip patch antennas manufactured an FR-4 substrate and resonating at 5.7 GHz are used create suggested sensor. solution placed between two antennas. An electronic conditioning circuit analog readout circuit) condition received A novel measure amount of observe variation DC...

Utilizing R-2R ladders in design of active-RC approach promotes IC implementation low frequency filters and leads to high linear power solution for biomedical applications. However, area limits operation this few tens Hz. This range is sufficient designing 60Hz powerline notch filter, but lowpass filers requires much lower pole frequencies. paper investigates the use other type (R-αR) filter design. It shows that R-1R, R-0.5R R-0.1R provide better than counterparts pass with ultra-low...

This paper provides a way to model the multiple-input multiple-out (MEMO) Fibonacci (FSC) and Series-parallel (SPSC) switched-capacitor converters. The models are constructed by relating extreme levels of input output voltage, i.e minimum voltage maximum which identifies conversion ratio converter. proposed verified experimentally using 3-stage FSC SPSC experimental results in good agreement with models.

The frequency-to-voltage converter is a versatile circuit that translates variations in frequency to corresponding voltage level. However, converting high-frequency signals into DC output has been challenging task. This paper proposes new, yet simple, approach for the of sinusoidal signals. conversion achieved by utilizing attenuation band filter. provides clear mathematical model and relation between levels, with merely passive components efficient power consumption. technique implemented...

This brief provides a simple yet novel structure to achieve voltage conversion ratio (VCR) that exceeds the theoretical attainable VCR of topological switched-capacitor DC-DC converters (SCC). Typically, SCC terminals are connected input voltage, output or ground reference. The proposed in this utilizes ground-connected and instead connecting them negative provided by negator stage. Here, two types used as case studies: Series-parallel (SPSC) Fibonacci (FSC). model for is constructed...

In this letter, a reconfigured switched-capacitor converter (SCC) is proposed that capable of achieving seven negative voltage conversion ratios (VCRs) using only three flying capacitors and minimum number switches. The used to drive white-LED backlight (WLB) in cellular phones for various conditions. VCR realized with single-input single-output structure 10 CMOS switches capacitors. SCC has an advantage choosing buck/boost voltages the WLBs black light tested experimentally low input mV 0.5...

<p>This paper provides a simple yet novel structure to achieve voltage conversion ratio (VCR) that exceeds the theoretical attainable VCR of topological switched-capacitor DC-DC converters (SCC). Typically, SCC terminals are connected input voltage, output or ground reference. The proposed in this utilizes ground-connected and instead connecting them negative provided by negator stage. Here, two types used as case studies: Series-parallel (SPSC) Fibonacci (FSC). model for is...