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We present ultra-wideband zero-bias Schottky diode detector modules with monolithically integrated log-spiral antenna. Detectors exhibit a broad-band response with a stronger roll-off above 800 GHz and the minimum noise-equivalent power of 10 pW/√Hz. The intrinsic diode response time to a short THz radiation has been measured to be less than 25ps.
It is well known that a spin-torque microwave detector (STMD) can be used for the determination of a frequency of an external microwave signal. We show that application of two independent STMDs connected in parallel at microwaves can substantially decrease the frequency determination error. We believe that obtained results are important for the practical development and performance optimization of...
Silicon detectors have been used in astrophysics satellites and particle detectors for high energy physics (HEP) experiments. For HEP applications, EMC studies have been conducted in silicon detectors to characterize the impact of external noise on the system. They have shown that problems associated with the new generation of silicon detectors are related with interferences generated by the power...
Using terahertz waves for imaging is gaining increased interest. A CMOS cascode amplifier biased near the threshold voltage of a MOSFET for terahertz direct detection is proposed. A test chip composed of 4×4 pixel CMOS terahertz imaging array is designed and fabricated on the basis of a low-cost 180-nm CMOS process technology. Each pixel consists of a microstrip patch antenna, an impedance-matching...
The correlation methods for signal receiving are widely used due to wideband electronics systems development. This technique gives high improvements for device features. Correlation methods are nowadays used in microwave metrology, radiolocation, medicine and in military applications in particular. In this place it should be mentioned: FMCW radars, noise radars, direction finding systems for electromagnetic...
Direct detection mm/sub-mm wave warm-carrier bipolar narrow-gap Hg1−xCdxTe semiconductor bolometers that can be used as sensitive elements in THz sensitive arrays, are considered. The response of Hg1−xCdxTe warm-electron bolometer was measured in ν=0.037−1.54 THz frequency range at T=68-300 K. In the detector (bolometer) considered the electromagnetic wave heats electrons and holes there, creates...
Conventional analog frequency discriminator is based on delay line. In this paper an idea of obtaining the signal's frequency by applying a passive equalizer as a frequency selective element is proposed. The prototype of the frequency discriminator was modeled, manufactured and characterized in 100–512 MHz frequency range.
This paper describes a design and realization of an affordable band-pass mesh filter as an element of a cheap sub-THz band spectrometer. The complete spectrometer system is to be built of a number of detectors of the THz radiation based on metal-oxide-semiconductor field-effect transistors monolithically integrated with planar narrow-band antennas fabricated on a thin substrate. The role of the filters...
We have developed a wide frequency tunable Continuous Wave (CW) Terahertz (THz) Signal Generator (SG) on the principle of Difference Frequency Generation (DFG) in a Gallium Phosphide (GaP) crystal. The CW THz SG has the merits of high resolution, high accuracy, wide dynamic range, high stability, high durability, easy operation/maintenance, and low cost. Combining the CW THz SG as a light source with...
This paper describes a new method for high accuracy determination of instantaneous frequency and linearity of frequency modulated continuous wave systems. The presented setup reduces the frequency measurement to a phase measurement based on Six-Port interferometer with a delay line. To extend the range of possible input frequencies and power levels, a calibration method and the appropriate correction...
This paper reports a phase detector MMIC operating in the frequency range of DC to 40 GHz, with an average power conversion gain of 11 dB with wideband input matching. The MMIC is realized in 0.25 µm SiGe HBT technology. The phase detector is dedicated to form a Costas loop for broadband binary phase shift keyed signals.
The design of a four-port scalar reflectometer operating at center frequency 2.4 GHz is presented in this paper. The proposed reflectometer is constructed from two 10 dB branch-line couplers, which are produced in microstrip line technique. Parameters of the realized device are in good agreement with simulation results. Directivity of the two couplers is over 22 dB at the center frequency. The reflection...
This research presents a preliminary study of human body electromagnetic radiation (EMR) for stroke patients. The stroke patients were divided into two categories: right and left hemisphere. A total number of 199 volunteers consisting of 84 right hemisphere and 115 left hemisphere stroke patients undertaking treatment participated in this experiment. The frequency readings were collected around the...
The spread of rumors on social media, especially in time-sensitive situations such as real-world emergencies, can have harmful effects on individuals and society. In this work, we developed a human-machine collaborative system on Twitter for fast identification of rumors about real-world events. The system reduces the amount of information that users have to sift through in order to identify rumors...
Partial discharge (PD) is the main cause of the failure of power apparatus insulation. The detection of PD in the early stage is useful to understand the condition of power apparatus, to design predictive maintenance program, and to prevent the breakdown of power apparatus. PD signal can be detected by the sensor. This paper deals with design of resistor capacitor (RC) circuit as PD detector. The...
A technique is presented to improve both the input 1-dB compression point (IP1dB) and the third-order intercept point (IP3) of a mixer using real-time knowledge of the incident RF power to the mixer plus look-up tables (LUTs) that contain measured performance data of mixer under different bias conditions. The concept is applied to an active mixer designed in-house on 130 nm CMOS technology. The mixer...
The observation of corona discharge points on the surfaces of the insulating materials and conductors seem to be quite crucial during the corona researches. The ‘solar blind’ ultraviolet imaging detector cameras have performed efficiently in detecting corona discharge in power facilities. In order to investigate the negative dc corona effects on ultraviolet photon count, a corona measurement system...
Radio frequency (RF) power meter is useful device for design of wireless communication systems and for many other applications. It is important device for RF design engineers in order to measure the level (strength) of electromagnetic (EM) field at any point from transmitter. For example, using RF meter, we can check if the EM field is below the specific allowed level for human health. Moreover, we...
We study the response of a graphene photothermoelectric-based detector illuminated by two continuous-wave optical beams. The power and frequency dependence of the photoresponse are used to probe the graphene hot-electron cooling rates and mechanisms.
Computer aided design and simulations are an integral part in the development process of integrated circuits. In order to evaluate the electromagnetic compatibility (EMC) of integrated circuits in simulation, simulation models of the EMC measurement setup and the EMC measurement device are needed. In this work, an electromagnetic interference (EMI) receiver simulation model is presented. The EMI-reciever...
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