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The baseband and intermediate frequency (IF) frequency modulated continuous wave (FMCW) radar receiver topologies are compared on the bases of receiver nonlinearity, time domain interferometry, receiver noise and demodulator port isolation. It is shown that an IF receiver is capable of suppressing distortions, where the same nonlinearity would result in a baseband (or zero-IF) receiver detecting false...
RF signal is ease to be interfered, which makes the signal of transmitting and receiving impure to impact on wireless communication. It is not to be ignored for interfering between transceiver signals in package of transceiver, thus, insulating enough must be taken. In addition, the mount of noise introduced through a main interference source being from contribution of digital signal continuously...
As part of ONR's Integrated Topside (InTop) Program, in 2014 Northrop Grumman delivered a bi-static, active, electronic scanned array (AESA) system, capable of multifunction, simultaneous transmit and receive operation. The system is wide band, transmits high power and has high receive sensitivity. Further, there are simultaneous transmit and receive modes required, in which the transmit AESA radiates...
This paper deals with evaluation and simulation of direct detection radiometer, which operates in the W-frequency band. Radiometers can be used in wide range applications in industry, military and security as well. One of the possible applications where the radiometers can be used is scanning of concealed dangerous objects. Main part of the article deals with the theoretical analysis of the basic...
Image shading in high-field magnetic resonance imaging (MRI) due to radio-frequency (RF) wave propagation effects in biological tissue can be used to measure the electrical conductivity and relative permittivity of tissue in vivo. We describe a method to extract electrical properties of biological tissue from RF-shaded MR images without an explicit RF field mapping. The method is demonstrated on a...
The noise properties of two multi-heterodyne spectrometers based on multi-mode semiconductor lasers (QCLs and ICLs) are investigated to determine their detection performance limitations. Both laser technologies provide well-defined multi-heterodyne beat-note structures suitable for spectroscopic measurements.
We demonstrate low-noise mid-infrared frequency comb generation using a silicon microresonator. Using an integrated PIN-diode detector, we show a transition to a low RF-amplitude-noise state consistent with demonstrations of phase-locking in other microresonator platforms.
Intra-electromagnetic noise coupling paths from RF-digital to RF receiver front end can be either of air, wire conduction, Si substrate or package/board. In this paper air and wire conduction coupling paths analysis is discussed. A miniature magnetic near field probe is applied to scan over the test chip to map magnetic near field at LTE band 1(2.1 GHz range). The map is reviewed to extract those...
Chopper stabilization is the most widely used circuit technique to reduce the influence of the flicker noise in an amplifier. Recently, observation of /ƒ2 input-referred noise in the chopper amplifier with a high-impedance input source was reported. However, the mechanism of this /ƒ2 phenomenon has not been completely analyzed. This paper provides the complete analysis of the noise influence generated...
Towards meeting the continued demand for higher performance in analog/RF ICs, the semiconductor industry has resorted to aggressive design styles. In conjunction with the increased variation of modern processes, aggressive design jeopardizes yield and, by extension, profitability of the design. In an effort to facilitate aggressive high-performance design without compromising production yield, modern...
The level of requirements for a readout front-end electronics dedicated for X-ray imaging applications, such as: high count rate ability of input pulses, low noise, low power dissipation and low silicon area occupation noise, is still increasing. The question: what one can do to minimize silicon area and keep front-end electronics analog parameters at a desirable level at the same time, is still important...
This work proposes an inductorless wideband low noise amplifier (LNA) for multistandard applications. This LNA is based on a self-biased complementary current-reuse common source amplifier on the forward path and a source follower on the feedback, using a gyrator-C like effect to create real valued impedance and an inductive effect, achieving wideband input matching. Designed in IBM 130 nm CMOS process,...
In this paper a highly-linear software defined radio front-end (LNA and Mixer) for wireless sensor networks in the 5.8-to-13 GHz frequency range is presented. It is suitable to IEEE 802.15.4a and IEEE 802.15.4a and upcoming different standards. The RF front-end features a very high robustness to out-of-band interference (OBI) thanks to mixer-based RF blocker filtering. This allows to remove any dedicated...
In this work we propose a measurement setup topology suitable for the automatic DC and low frequency noise (LFN) characterization of field effect transistors at wafer level. The system is composed of source and measure units (SMUs), by a custom-built low noise amplifier (LNA), and by a PC based spectrum analyzer. No bias filters and switch matrices are used, allowing fast switching between DC and...
The measurement and analysis of low level vibrations and Acoustic Emissions in components, fabrications and structures, is often accomplished by the utilisation of multiple distributed piezoelectric sensors. The frequencies of interest usually commence in the upper audio range above 2 kHz, but are more typically ultrasonic frequencies (up to 1MHz). Such measurements are intrinsically limited in terms...
Crossed anisotropy amorphous Co85Zr3Nb12 thin film with total magnetic thickness of 2.0 µm is deposited on to the passivation of a test IC chip to accommodate intra IC chip level digital-to-RF noise suppression and telecommunication performance simultaneously. This technology is applicable to other frequency band in 0.41 to 3 GHz by using Co85−(x+y)Zr3+xNb12+y(x: 0−5.5, y: 0−11.0) film. In-band spurious...
The average smart phone user picks up the device 1,500 times a week. Wireless communication appears to be taking over our lives but it also presents interesting challenges to RF designers. This paper contends that the mobile terminal will emerge as a central command post for most of our daily affairs and will therefore sustain an increasingly heavier load in terms of speed, power dissipation, and...
This paper details the architecture for a minimal commensal radar system which makes use of commercial FM broadcast band transmitters for the detection of aircraft. The architecture, consisting of a RF front-end, digital acquisition and radar signal processing up to the detection stage (after CFAR on a Range-Doppler plot), is intended to be small, easily portable, low power, and yet able to operate...
Detecting a Radio Frequency device such as a Push-to-Talk (PTT) radio has several military and civilian applications. Detecting PTT radios can be used in search and rescue applications and in providing early detection and warning of existing PTT radios that were previously unknown. This study analyzes the ability of using two tone intermodulation distortion as a way of detecting PTT radios, along...
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