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MOX gas sensors show a wide input resistance variation due to different employed materials, sensor ageing, and temperature variations, when encountering target gases. From the electronics point of view, a wide dynamic range readout interface is needed. The role of the interface is to accommodate the signal received by the sensor in order to be converted into digital or quasi-digital signal. This operation...
To characterize chemoresistive sensors based on novel materials a versatile measurement system is required that is able to accurately control/measure all the quantities of interest (among which test gas mixture composition, relative humidity, sensor surface temperature, sensor resistance). In the last years the authors have developed a laboratory measurement system with these characteristics [1],...
Unmanned aerial vehicles are aggressively entering many fields of scientific research thanks to their versatility, relatively low cost and ease of customization. Among all the envisioned applications, environmental monitoring and disaster recovery are very interesting and promising. In this scenario, drones instrumented with environmental sensors are driven into contaminated or inaccessible areas...
This paper presents a CMOS capacitance-to-digital converter (CDC) for capacitive sensors applications. Off-chip capacitive sensors are fabricated by coating sensing materials on interdigitated electrode (IDE) structure. A CDC consists of a capacitance-to-voltage front-end and 12-bit successive approximation register analog-to-digital converter (SAR-ADC) in a single chip is used for converting sensor...
Approximate computing circuits are considered as a promising solution to reduce the power consumption in embedded data processing. This paper proposes an FPGA implementation for an approximate multiplier based on inexact adder circuits. The performance of the proposed multiplier is evaluated by comparing the power consumption, the accuracy of computation, and the time delay with those of an approximate...
Due to an increasing demand for on-sensor biosignal processing in wireless ambulatory applications, it is crucial to reduce the power consumption and hardware cost of the signal processing units. Discrete Wavelet Transform (DWT) is very popular tool in artifact removal, detection and compression for time-frequency analysis of biosignals and can be implemented as two-branch filter bank. This work proposes...
This work describes an approximate DCT architecture for the High Efficiency Video Coding (HEVC) standard. Since the standard requires to support multiple block sizes, architectures based on exact implementation require a relevant amount of hardware resources, namely multipliers and adders. This work aims to reduce the amount of hardware resources while keeping the rate-distortion performance nearly...
This paper presents the algorithm and architecture for approximate distribute arithmetic (ADA), which tolerates timing faults in SRAM- or ROM-based lookup tables (LUT) at ultra-low voltages by applying fine-grained bit-slice skipping and compensation. A zero count-based timing fault detector is also proposed, where false-negative detections with seriously decreased SNR are completely avoided. The...
This paper presents a Bluetooth Low Energy (BLE) based receiver that features a low power LNA and a novel passive AND function mixer. The entire receiver is designed and simulated in the TSMC 65nm planar CMOS technology. The receiver benefits from a direct down conversion technique where the baseband signals are separated into I/Q paths based on the phase of the signal. The overall input sensitivity...
A highly linear, low noise amplifier (LNA) with cascode topology is presented in this work. The proposed circuit is designed in 45 nm TSMC CMOS technology. The linearity factor is improved with an inter modulation distortion (IMD) technique. The band of operation is around the 2.45 GHz frequency, designed for Bluetooth application prospects. The circuit exhibits a power gain, |S21|, of 14.1 dB and...
This paper provides quite a new approach for analog computing. This work proposes an analog characterization module to imitate (emulate) various analog components as essential technologies for analog reconfigurable system. This module converts an analog input signal into digital by an ADC, makes use of digital signal processing technologies to characterize the signal as expected, and outputs the analog...
In this paper a prototype of a free-space optical communication system is proposed. The transmitter is equipped with a blue 1W LED and a low-cost microcontroller implementing a digital modulation scheme. The receiver converts the incoming light into a current through a photodiode and another identical microcontroller is employed to demodulate and decode the signal, after proper analog amplification...
This paper offers novel insights in the importance of optimal design of the connections between component ground plane and the common reference plane in integrated Silicon circuits while presenting a differential 1.5-2.5 GHz wide bandpass filter design based on lumped elements and manufactured in Global Foundries SiGe 8HP BiCMOS process. Lumped elements are rarely implemented because of their size...
In this work, a regulated high negative voltage generator for biasing single-photon avalanche photodiodes (SPAD) was developed. The circuit provides up to -70 V from a positive voltage source. This circuit allows users to control the negative output voltage using a positive voltage rail, thus eliminating the requirement of a negative voltage for the negative voltage control. This approach simplifies...
Analog FIR filters are critical components of advanced data processing and communication systems. Unlike digital filters, they do not utilize clock signals, but require broad-band analog delay units and variable-gain linear amplifiers. This paper describes a 9-tap linear FIR filter IC with a novel tree-shaped architecture based on an internal transmission line with a special configuration and variable-gain...
In this paper, a novel image sensor architecture based on a clock-less readout is presented. The proposed proof-of-concept consists of only 12x6 pixels and validates the new readout scheme designed for low power application, which is particularly suitable for embedding energy harvesting circuit even though not included into the design. Thanks to the clock-less serial readout with embedded PWM interface,...
This paper presents an alternative to electrical configuration of capacitive energy harvesters with multiple transducers. The configuration is constructed to combine all the transducer outputs into a single output and performs identically to the linear two-port model. Further development of a power electronic interface circuit is investigated by circuit simulation. The circuit is used to convert the...
Modern prostheses aim at restoring the functional and aesthetic characteristics of the lost limb. To foster prosthesis embodiment and functionality, it is necessary to re-establish both volitional control and sensory feedback. Contemporary feedback interfaces presented in research use few sensors and stimulation units to feedback at most two discrete feedback variables (e.g., grasping force and aperture),...
Gesture control plays an increasingly significant role in modern human-machine interactions. This paper presents an innovative method of gesture recognition using flexible capacitive pressure sensor attached on user’s wrist towards computer vision and connecting senses on fingers. The method is based on the pressure variations around the wrist when the gesture changes. Flexible and ultrathin capacitive...
Intracortical microstimulation (ICMS) in the primary somatosensory cortex (S1) offers a potential method to restore somatosensory perception in people that have lost this capacity through injury or disease. Under an Investigation Device Exemption, a twenty-eight year old participant with a long-term cervical spinal cord injury was implanted with two microelectrode arrays in primary motor cortex and...
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