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This work presents the design, simulation, fabrication and measurement of a novel set of microstrip filters to perform the task of frequency discriminators. These filters' frequency responses are based on the balanced Gray-code. Results show that the use of the balanced Gray-code, as opposed to the traditional Gray-code, allowed 20% circuit size reduction by using 60% less resonators due to a change...
This paper presents a compact dual-band dual polarized frequency selective surface (FSS) with angular stability for wireless communication applications. The proposed FSS element geometry is composed of a slotted cross dipole combined with four annular rings which are placed to provide symmetry along the conducting patch main axes. Simulation is performed using Ansoft HFSS software to ensure dual band...
Photonic generation of a linear-frequency microwave waveform with ultra-wide frequency tunable range based on dispersion-compensated optoelectronic oscillator (DCOEO) is proposed and experimentally demonstrated. The microwave carrier frequency of the generated linear-frequency microwave waveform varies from 4 GHz to 45 GHz.
In this paper we discuss the design and development of the Radiometer Digital Backend (RDB) of the CubeSat Radiometer Radio Frequency Interference Technology (CubeRRT) validation mission. We present a brief introduction of the mission and the Radio Frequency Interference (RFI) detection and mitigation algorithm. The digital backend developed for the CubeSat is presented. The digital backend has unique...
Atomic force microscopy is a uniquely powerful tool for single molecule research. In addition to high-resolution imaging of static systems, recently developed high-speed atomic force microscopes (HS-AFM) enable the observation of dynamic processes at the nanoscale. HS-AFM instrumentation has been developed by systematically increasing the bandwidth of individual components. However, the phase lag...
This paper presents the integrated design of a magnetically levitated dual-stage positioning system to improve the bandwidth of traditional maglev positioning systems. The primary stage of the proposed dual-stage system is a 6 DOF maglev positioning system, and a specifically designed flexure-based actuator is utilized as the secondary stage to further compensate the error of primary stage. Compared...
We report on metrological-grade saturated absorption spectroscopy of CHF3 at 8.63 μm based on CW distributed-feedback QCL laser and a mid-IR self-frequency referenced optical comb. The experimental setup for the saturation spectroscopy of CHF3 is shown in Fig. 1. A CW DFB-QCL with a maximum output power of ∼40 mW tunable in the wavelength range from 8.55 to 8.65 μm, in coincidence with the us (asymmetric...
Techniques for stabilizing the carrier-envelope offset (CEO) frequency of an optical frequency comb are prerequisites for precision spectroscopy. A 2f-to-3f self-referencing interferometer (SRI) requires only a 2/3-octave bandwidth of supercontinuum (SC) light; however, it has not been regarded as a practical method because the conversion efficiency of third-harmonic generation is much lower than...
An analog all-pass filter based transfer function synthesis method is proposed for realizing multifunctional microwave active circuits. An analog realization is obtained by replacing unit sample delays in an existing digital prototype with a second-order all-pass analog filter. A novel space time array processor (STAP) and a frequency and bandwidth agile multi-band filter have been simulated using...
Ray tracing is a useful tool to model the spatial and temporal propagation parameters of electromagnetic radiation. The model can normally improve by the channel sounding. However, discrepancies may arise between the channel sounding and ray-tracing model due to it needs a wide bandwidth to differentiate the incoming signals, also the antenna radiation pattern may change dramatically over this wide...
Millimeter wave (mmWave) communication has been a key technology for the fifth generation (5G) wireless communications. There have been various mmWave channel measurements. However, many measurements in the literature are conducted with different configurations, which may have large impacts on the propagation channel characteristics, and make the comparison of propagation channel characteristics for...
This paper presents a 3rd order single-bit CT ΔΣ modulator with active-RC integrators using negative-R assistant at virtual ground, which mitigates opamp's requirements including the thermal noise and linearity leading to a drastic power-saving. Fabricated in a 65nm CMOS process, the modulator occupies area of 0.27mm2. It achieves 100.5dB SFDR and 93.1dB DR in 20kHz BW, while consuming only 55μW from...
Modern transmitter architectures make use of multi-input multi-output (MIMO) techniques, employing a high number of RF power amplifiers (PAs) to excite an antenna array. The array elements are often coupled, creating an excitation at the output of the PAs, which is dependent on the outputs of the other elements. Therefore, in this system, the nonlinear behavior of each PA cannot be fully described...
A 300MS/s 12b SAR ADC achieving 61.6dB peak SNDR is presented. It reaches 60.5dB SNDR and 78.7dB SFDR with 0.8Vpp,diff input amplitude at Nyquist. The key elements are a comparator with inverter-based preamplifier and a SAR-based common-mode regulation. The regulation adjusts the common mode on a sample-by-sample basis to improve common-mode rejection. The ADC consumes 7.0mW from a single 0.85V supply,...
A dual-peak maximum achievable gain core design technique is proposed. It has been adopted into a 4-stage wideband amplifier. Implemented in a 65nm CMOS, the amplifier achieves 3dB bandwidth of 30GHz (230∼260GHz), gain of 12.4±1.5dB, and peak PAE of 1.6% while dissipating 23.8mW, which corresponds to the widest bandwidth and highest gain per stage among other reported CMOS amplifiers operating above...
In this paper we propose a bidirectional front-end for resonating sensors with bandwidth control used to remove the high order oscillating modes. The electronic interface is based on an inverter working as amplifier biased by a voltage buffer, both realized in CMOS technology. The bandwidth of the amplifier can be tuned by varying a bias voltage which controls the high cut-off frequency of the front-end...
FFT-based measuring receivers can be used for EMI compliance measurements in accordance with Amendment 1 to 3rd Edition of CISPR 16-1-1 if this standard is referenced in the product standard. The use is motivated by reducing the scan time by several orders of magnitude and to get more insight due to the possibility of applying longer measurement times and enhanced measurement function like the persistence...
The article describes the concept of building a universal modular multi-channel system for measuring, registration and investigation of noise for various electronic devices, including 1/f noise. Main attention is paid to the principles of construction of the measuring channel with low noise, the ability to work at very low frequencies (including DC) without highpass filter, methods of compensation...
An ultra-wideband mm-wave voltage controlled oscillator (VCO) is presented. By utilizing an optimum design of the passives embedding around the core transistor in a Colpitts structure, the VCO tuning range is enhanced. The impact of DC bias on the tuning bandwidth is discussed. The generated second harmonic is efficiently extracted and radiated using a wideband slot antenna. The chip is fabricated...
The rms timing jitter of a phase-locked loop (PLL) is calculated and minimized analytically from the VCO phase noise and the in-band phase noise plateau with and without digital baseband correction in an OFDM system. Subsequently, we present an integrated wideband frequency synthesizer in a 130 nm SiGe BiCMOS technology. An 8.7GHz-11.8GHz PLL using only one VCO is followed by a frequency sixtupler...
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