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We summarize several lines of investigation of foundry-processed patch-antenna-coupled Si MOSFETs as plasmonic detectors of THz radiation. First, we explore detection at frequencies as high as 4.3 THz, about one hundred times higher than the transit-time-limited cut-off frequency of the devices, searching for the fundamental limits of the detection principle. Then, we address the much-debated issue...
A mm-wave delay locked loop (DLL) using a full rate sub-psec phase detector (PD) is presented. The PD employs a differential lumped hybrid coupler to create and combine quadrature phase components of the input signals and performs amplitude measurement in order to measure phase difference between the input signals. The DLL and PD were implemented using the TSMC 40nm LP CMOS process and measured using...
A fast protein concentration measurement system with two-port FPW (flexural plate wave) biosensors using a frequency-shift readout technique is presented in this paper. The proposed frequency-shift readout method employs a peak detecting scheme to measure the amount of resonant frequency shift. The frequency sweep range of the linear frequency generator is limited in 2 MHz to 10 MHz according to the...
Surface acoustic wave (SAW) devices are used as sensing elements in the best performing portable chemical detectors. The SAW device, with a selectively absorbing chemical coating, serves as a mass sensor which preferentially responds to various chemical exposures. To obtain the highest performance, a number of criteria must be optimized, including SAW microwave insertion loss, impedance matching,...
By combing ultra-fast photonic-transmitter-mixers and envelop detectors with record-high modulation (26 GHz) and video bandwidths (37 GHz), respectively, error-free on-off-keying wireless transmission at W-band with data rate as high as 25 Gbit/sec can be achieved.
In this publication an integrated reflectometer in SiGe BiCMOS technology for sensor readout at 62 GHz is presented. The circuit includes an oscillator, a six-port reflectometer, and a dummy sensor for verification purposes. The circuit has a bandwidth of 8GHz at a center frequency of 62 GHz. It operates at 3.75V supply voltage and consumes 282 mW. The measurement principle is demonstrated and the...
We demonstrate a dipole antenna that utilizes surface plasmons for enhanced sensitivity of narrowband coherent terahertz detection. We also describe properties of a multiband dipole detector that would allow for enhanced sensitivity at multiple frequencies.
Shortcomings of the traditional bit error rate (BER) analyzing method of digital communication systems are analyzed. Based on the amplitude probability distribution (APD) principles which are introduced in this paper, the method is improved. The error probability algorithm, which contains amplitude and phase elements of interference signals, of binary digital communication system based on APD is also...
The main problem in fire detection using linear detectors, independently of its type, is a precise distance determination of fire from control equipment. This work presents experimental results realized on three different types of coaxial cables: RG U/6, RG 178 B/U and RG 122/U produced in cable factory in Jagodina, as well as simulation results realized in Pspice computer simulator. The aim of this...
In this publication a fully integrated multiprobe reflectometer at 122 GHz is presented. It can be used for readout of resonator-based dielectric sensors for measurement of chemical, biological, or medical liquids. The circuit consists of a voltage-controlled oscillator, an amplitude modulator, a capacitive tapped line, four power detectors, and a dummy sensor. The circuit is operated from a 3.75-V...
Modern equipment for azimuth measurements of radiant source antenna perform pulse measurements. This paper presents pulse measurements on application-specific portable wideband microwave detector that is capable to measure azimuth, received signal power level, frequency, and pulse parameters. The considered power level is form −80 up to −20dBm, and frequency band from 11 up to 15GHz with resolution...
Based on a low-cost, micromachined IR source with subsequent gas specific filter, photoacoustic spectroscopy (PAS) was investigated in a non-resonant operating mode of a gas chamber. In addition, non-dispersive infrared (NDIR) transmission measurements based on a thermopile detector were used to expand the measurement range, but also for monitoring purposes. Compared to many existing systems using...
In the power system, neutral grounding is usually adopted in small current neutral grounding system whose voltage grade does not exceed 60kV. In this way, if a single-phase ground fault occurs, due to that line voltage is still symmetric and fault-phase grounding current is very small, this system can still run 1 to 2 hours to improve the power supply reliability. However, in order to prevent the...
A recent work has presented closed-form expressions for the response of a twisted-wire pair (TWP) above ground illuminated by an external plane wave. This work addresses the same topic from an experimental point of view, The proposed setup consists of a TWP terminated with passive networks equipped with radio-frequency detectors. The measurement procedure and its relevant technical issues are discussed...
Multispectral photometry is often required to distinguish samples in flow injection analysis and flow cytometry; however, the cost of multiple light detectors, filters, and optical paths contribute to the high cost of multicolor and spectral detection systems. This paper describes frequency division multiplexing (FDM), a simple approach for performing multi-wavelength absorbance photometry with a...
In this work the applicability of single crystalline PIN-PMN-PT in cpyroelectric detectors was evaluated and compared with high-quality Mn-doped PMN-28PT and standard LTO. Pyroelectric and dielectric measurements confirmed an increased processing and operating temperature range due to higher phase transitions of PIN-PMN-PT. Pyroelectric coefficient of 705–770 µC/m2K was obtained with PIN-PMN-PT, which...
In this study, a novel zero-crossing detector has been designed and implemented that operates as quite steady under the distorted grids due to harmonics. For this aim, a circuit has been designed using UA741, an operational amplifier, which is not affected owing to instant spikes and sags on the signals of current or voltage. Most of the zero-crossing detectors presented in the literature recently...
As Fizeau interferometer(FI) produces linear fringes which can be conveniently detected by a linear detector, the direct detection Doppler lidar based on Fizeau fringe technique may prior to that based on Fabry-Perot fringe technique. The principle of Fizeau fringe technique and the retrieved method for Doppler frequency are discussed elaborately. In order to further study the Fizeau fringe imaging...
In this paper, a CMOS peak detector is proposed. The proposed peak detection is based on signal's slope variation and it can be easily exploited for positive as well as negative peak detection. Besides it can also be used for multiple peak detection without needing resetting operation, making the circuit implementation quite simple. A switched-capacitor-based (SC-based) implementation is given along...
This paper compares different detection methods of radio broadcast frequencies to reduce dynamic PSD. It starts with spectrum analyzer-based measurements on the power lines to get experience with the ingress caused by the radio stations. Then a short wave radio detector algorithm is presented. Detailed analyses are made using this detector in conjunction with hundred thousands of PLC channels of devolos...
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