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In this paper, the process of generating a signal frequency modulated continuous wave (FMCW) using direct digital synthesizer (DDS) will be presented starting from the design process simulation using the software on the computer until the realization and measurement of the generation of such signals on a module DDS, the kits from Analog Devices. Generation conducted a baseband signal with a bandwidth...
Phased array receive/transmit systems are widely used in radar and electronic warfare applications. A low noise receive module for a phased array system operating at 3–6GHz band is designed, produced and validated. The measurement results are compared to the numerical results obtained from AWR Design Environment simulations.
III-nitride light emitting diodes (LEDs) have been used for many applications covering the spectrum of ultraviolet (UV) to visible light (VL). Despite of significant improvements on solid-state lighting, LEDs still suffer significant efficiency loss at high carrier density, commonly referred as "efficiency droop" [1]. However, compared to LEDs, laser diodes (LDs) have higher power per chip...
Traditional flared notch arrays for ultra-wideband phased-array applications are known for excellent matching but have very poor polarization control in the diagonal scan plane. The sliced notch array is a variant of the flared notch that by contrast has excellent cross-polarization performance at all scan angles and frequencies for the same LxWxH size array. In this paper we report the first experimental...
This work presents the development of a low cross-polarization ultra-wideband end-fire notch array element, termed the Sliced Notch Antenna (SNA). The proposed element topology solves the long-standing problem of polarization purity degradation in typical end-fire notch arrays (Vivaldi arrays) when scanned in the non-principal planes by re-configuring the high-profile continuous metal Vivaldi fin...
Traditional flared notch arrays for ultra-wideband phased-array applications are known for excellent matching but have very poor polarization control in the diagonal scan plane. The sliced notch array is a variant of the flared notch that by contrast has excellent cross-polarization performance at all scan angles and frequencies for the same LxWxH size array. In this paper we report the first experimental...
By using partially depleted Ga0.8In0.2As0.16Sb0.84 absorber in GaSb based photodiodes for 2.5 pm wavelength operation, such device achieves high-speed and high-saturation current (3.6 mA/6 GHz) performances with low dark current (0.7μΑ at −2V). Device modeling results suggest that the internal carrier response time limits its dynamic performance.
Software Defined Networking (SDN) is in the process of revolutionizing the way of managing networks by providing a new way to support current and future services. However, by relocating the control functionality in a remote entity, the measurements' accuracy of the resources' utilization becomes more difficult, which complicates the decision making. Although there are previous works focusing on the...
We report on a detector-free on-chip dual frequency comb setup based on terahertz quantum cascade lasers. The presented dual-comb covers a bandwidth of 630 GHz with a centre frequency of 2.5 THz. Instead of a fast detector one of the lasers has been used as a fast detector itself. The frequency comb spacing was analysed using frequency counting techniques revealing an accuracy down to δfrep/fcarrier...
Most of the high speed low power ADCs are interleaved using calibration which have some drawback like calibration time, the complexity associated with calibration algorithm and its circuit implementation. Therefore a single channel calibration-free 12-bit ADC sampling at 600MS/s in 28nm UTBB FDSOI is presented. Selected ADC architecture of mixing Pipelined stage and Asynchronous SAR demonstrates advantages...
Room transfer function (RTF) is the room response observed at a particular listening point due to an impulse generated from an omnidirectional point source. Typically, measured RTFs in practice are often erroneous due to the directivity of the measurement loudspeaker. This paper formulates a spherical harmonic based parameterization of the room response for a directional loudspeaker, and provides...
We report on a monolithic extracting structure for terahertz quantum cascade laser based frequency combs. For a spectral bandwidth of more than 600 GHz at a center frequency of 2.5 THz a frequency comb with well-defined farfield pattern could be achieved. In addition the dynamic range of the frequency comb has been significantly improved.
With the introduction of Fast Fourier Transform (FFT) EMI receivers, the time required to perform electromagnetic interference (EMI) measurements has been drastically reduced. In theory, these instruments allow measuring the whole band at once. However, aspects related to (i) the level and band of input interference, (ii) prescriptions in EMI normative (i.e., CISPR 16-1-1), and (iii) achievable performance...
High frequency (≥20 MHz) phased-array ultrasound transducers exhibit many benefits in biomedical applications. However, high performance array transducers, with high resolution and high sensitivity, are hard to fabricate due to the limitation of their rigorous dimensions. In this study, to achieve a high −6 dB bandwidth, a 20-MHz 64-elements phased-array transducer based on a PMN-0.3PT single crystal...
A new approach for designing a parallel coupled-line coupler with controllable bandwidth is presented. The proposed circuit consists of one coupled-line section and four open- or short-circuited stubs tapped at the ends of coupled lines. The adjustable range of fractional bandwidth is from 7% to 45% controlled by adjusting the impedance of stubs. An experiment coupler operating at 2.5 GHz was fabricated...
In our previous paper we described the sine signal frequency discriminator based on using the special RF equalizer in two channels RF system and these channels amplitude comparative function calculations. In this paper we show its advancement — the new three channels frequency discriminator with an extra RF equalizer. This frequency discriminator can be applied to processing of signals' with spread...
By using type-II absorption-collector interface and graded-bandgap collector in UTC-PDs for zero-bias operation, such photodiode achieves record 3-dB O-E bandwidth (140 GHz) and sub-THz output power (−13.9dBm at 160GHz) among all the reported zero-bias photodiodes.
In this paper is presented a new printed monopole antenna, bio-inspired by jasmine flower, that meets the Federal Communications Commission parameters for ultra-wideband systems. The design of the printed monopole antenna in jasmine flower has developed from a printed monopole antenna with circular geometry, with comparison results. The measured results of bio-inspired antenna in the jasmine flower...
This work presents the design and testing of an integrated 8-channel CMOS biopotential recording chip, consisting of low-noise input stages, tunable second stage, a multiplexer, and two analog-to-digital converters (ADC). Through its variable supply concept, the integrated input-referred noise of the first stage is selectable from 1.5 down to 0.63 μVRMS (ISS = 200 μΑ), which is superior to standard...
A 35–50 GHz mixer module for the Atacama Large Millimeter/submillimeter Array (ALMA) band-1 receiver is presented in this paper. By using triple cascode structure and modified dc bias technique, a mixer with wide intermediate frequency (IF) bandwidth (4–12 GHz), low LO driven power, and high LO-RF isolation is achieved. The chip is further packaged into a module. At LO frequency of 31 GHz, the mixer...
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