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This work presents a low-cost Ultra-Wideband (UWB) test-bed for impulse radio communications and sensing. The design was conceived for generic algorithm implementation and testing over a modular and simple architecture. The hardware design is based on commercially available components and is capable of achieving a 1 GHz bandwidth with a central frequency of 4.2525 GHz. The test-bed architecture is...
We present a new circularly polarized microstrip antenna with an airgap for multiple Global Navigation Satellite System (multi-GNSS) receivers. The airgap structure substantially increases antenna gain and bandwidth. We examined the antenna properties by simulation and measurement. The measured results show the −10 dB bandwidth of 4.9% and the maximum antenna gain above 7.0 dBi over the whole multi-GNSS...
In this paper, a directive, robust, and light weight antenna for Unmanned Arial Vehicles (UAV) communication applications is presented. The proposed antenna exhibits dualband operation from 4.53 GHz to 5.16 GHz with a bandwidth of 13.26% and from 5.3 GHz to 5.9 GHz with a bandwidth of 10.7%. Furthermore, it is characterized by good and stable radiation characteristics with overall realized gain of...
5G, the next generation of wireless communications, is focusing on modern antenna technologies like massive MIMO, phased arrays and mm-wave band to obtain data rates up to 10 Gbps. In this paper, we have proposed a new 64 element, 8×8 phased series fed patch antenna array, for 28 GHz, mm-wave band 5G mobile base station antennas. The phased array steers its beam along the horizontal axis to provide...
This paper presents a low voltage 5GHz WLAN receiver (RX) with 0.8V power supply. The RX targets 802.11ax standard implemented in CMOS technology node from 28nm to 14nm whose power supply voltage will decrease to 0.8V. The RX presents three key techniques that overcome the challenges for the low voltage operation. An RF amplifier employs a variable source degeneration to improve the linearity. A quadrature...
This paper describes an op-amp with a novel Class-AB Push-Pull output stage employing a “constant-transconductance” cell for keeping the amplifier gain-bandwidth product constant over different load conditions. A biasing scheme is also examined to define the quiescent current of the op-amp. The circuit is part of the current sensing scheme for a DC-DC Buck converter. The proposed system has been built...
This work exploits the well-known gm over ID methodology to develop a novel approach to optimize the design of regulated cascode amplifiers (RgC). The proposed design framework starts extracting a set of lookup tables describing the circuit's figures of merit as a function of the gm over ID ratio. Due to the feedback topology of the circuit, the performances, in terms of bandwidth, gain, and DC power...
Acoustoelectric imaging (AEI) is a new technique for mapping current densities at high resolution depending on the size of the ultrasound (US) focus. The design and performance of the recording system is crucial for efficient AEI because the amplitude of the AE signal in biological tissue is on the order of a microvolt or less. In this direction, an AE signal processing circuit (AE-SPC), containing...
Acoustoelectric (AE) imaging is a new technique for mapping current densities in the heart and brain at a high resolution determined by the size of the ultrasound (US) focus. Because the amplitude of the AE interaction signal in biological tissue is weak (on order of 1 μV), detection of small currents is challenging with poor signal-to-noise ratio (SNR). Because optimal detection depends on minimizing...
The design of an electrical impedance spectroscopy acquisition and processing system using a 0.13 μm CMOS technology with a 1kHz to 10 GHz functional frequency range is presented. The system is based on a quadrature modulator in a lock-in architecture. The design of each one of the modules of the system is explained, and post-layout simulations are used to validate the main features of the design...
This paper presents a constant bandwidth switched-capacitor programmable-gain amplifier (SC-PGA). By using an adaptive Miller compensation technique for the SC-PGA, our SC-PGA achieves low power consumption and high linearity at various gain conditions. The post-layout simulation results with 0.18 μm CMOS process show that power efficiency is tripled over the SC-PGA without the adaptive Miller compensation...
We present a transimpedance amplifier (TIA) based on a low temperature polysilicon (LTPS) process, which is operated in a rïactive atmosphere of alkali vapor contained in a glass cell. We successfully encapsulated the electronics and present a sealing method for the glass cell, which is compatible with the employed LTPS process and shows long term leak tightness in the ultra high vacuum regime. The...
In this paper a low power, high gain self bias opamp suitable for biomedical applications has been described. A novel trans conductance boosting technique is introduced without having any additional power consumption. A simple technique of biasing the opamp has been introduced for very low offset and without having any requirement for external reference circuit. A prototype of two stage amplifier...
In this paper, three designs of planar antenna is presented. These low profile planar antennas can be used within widely used bands of frequencies that is, between 800MHz to 9GHz (10 bands) of all cellular from 2G to 4G and beyond. In addition, the coverage frequency includes wireless local area networks (WLAN) and WiMax. Significant structural changes are made in one of the latest structure of multiband...
In this paper, a new broadband low noise amplifier (LNA) is proposed. The LNA utilizes a composite NMOS/PMOS cross-coupled transistor pair and a difference amplifier to in-crease the linearity while reducing the noise figure. The introduced approach provides partial cancellation of distortion and noise generated by the input transistors, hence, degrading the overall distortion. The LNA is implemented...
This paper discusses an analytical method for performance estimation of multi-stage transimpedance amplifier (TIA). For high speed and energy efficient optical communication, multi-stage TIA composed of pre-amplifier (PA) and Cherry-Hooper amplifier (CHA) are commonly used. However, it is not clear how to decide design parameters of PA and CHA. Additionally, the number of stages is also a design parameter...
In this paper, three Vivaldi antenna are introduced to compare their performance. As base for our study an ordinary Vivaldi antenna is designed. Then defected ground structures (DGS) are employed to extend the low-end bandwidth limitation and improve the radiation characteristics at lower frequencies. A prototypes with 4 pairs of DGS placed in the antennas is fabricated and experimentally compared...
This paper presents an optical receiver (RX) suitable for amplifying a high-speed PAM-4 signal. To achieve a high gain-bandwidth product at low power consumption, a triple inductively peaked regulated cascode (RGC) transimpedance amplifier is used. The inductors are implemented as small 3D solenoids to reduce chip area and optimized for minimum group delay variation. The receiver further includes...
A D-Band total power radiometer, implemented in an advanced 90 nm SiGe BiCMOS technology is presented. The passive imager front-end consists of D-Band LNA followed by a HBT-based power detector. The LNA achieves 30 dB gain over 28 GHz bandwidth with measured noise figure lower than 7.5 dB. The square-law power detector achieves responsivity of 14.5 kV/W and noise equivalent power (NEP) <1.5 pW/√Hz...
A low-noise and low-power signal conditioning circuit with narrow bandwidth is presented. The circuit cascades three stages. A high current and low supply voltage amplifier as the first stage decreases the thermal noise and power consumption. A differentiator and an integrator are used as the second and third stages to reach the amplification with a narrow bandwidth suitable for microelectromechanical...
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