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Broadband impedance matching for band-pass RF power amplifiers targeting Software Defined Radios (SDR) is reviewed with emphasis on the power supply voltage and how higher voltage operation could improve power versus bandwidth. Measured data on a 100 watts CW GaN amplifier operating at 100 V over the 500 MHz–2 GHz frequency band are shown to support the analysis. Results show that amplifier operation...
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...
Passive 180° phase-shifters (rat-race or monolithically integrated equivalent) have usually a frequency bandwidth narrower than an octave. A differential amplifier structure provides a very large operating bandwidth, and allows an easy MMIC integration.
DC microgrid is becoming popular due to high efficiency, reliability and easy integration of renewable sources. Droop controller based distributed technique is used in dc microgrid for proportional power sharing among sources. However, due to interconnecting cable impedance, trade-off exists between power sharing accuracy and voltage regulation. Centralized controller achieves these objectives using...
This paper discusses the loaded Q-bandwidth of non-Foster matched electrically small antenna(ESA) in the VHF/UHF band. The non-Foster circuit (NFC) is based on resonant tunnel diode (RTD) operating at negative differential resistance (NDR) region. A low quality factor (Q<1) across the matching bandwidth has been attained to ensure that the energy losses are minimum within the resonant circuit....
The aim of this work is to develop a dedicated low power transmitter interface for high-speed data transmission in CMOS 130 nm technology. Such interface is necessary in complex ASICs working at high frequencies and processing large amounts of data, in particular it is needed in advanced detector readout systems of particle physics experiments. New multichannel readout ASICs, capable to transmit data...
The present work proposes a novel DTMOS based current controlled conveyor (CCCII). The proposed DTMOS technique reduces the power consumption, reduces the voltage requirement to ±0.5V, and enhances the linearity of CCCII with low circuit complexity. The performance and validity of the proposed circuit has been verified by using it in a multifunction biquad filter using PSPICE, 0.18μm CMOS technology...
This work investigates the suitability of transmission-line resistance compression networks (TLRCNs) for energy recovery applications in wideband microwave outphasing transmitters. In order to successfully recover microwave power without introducing distortion in the outphasing transmitter, the energy recovery network must remain both efficient and impedance-matched at its input port over variations...
This paper discusses the use of an electrically small inverted L antenna for vehicular high-frequency (HF) communications. Questions related to the antenna height and tuning above infinite PEC ground, along with the decoupling from a vehicle are considered. It is demonstrated that the antenna can be easily tuned by means of commercially available passive elements, while the decoupling may be implemented...
In this work, we propose a PMOS based wide swing cascode current mirror (WSSCM) for 0.35 um CMOS-MEMS technology. The proposed circuit shows a high bandwidth current mirror with high output resistance capability operating at low voltage levels. Noise, output resistance and bandwidth analysis are presented. CADENCE SPECTRE circuit design tool using MIMOS 0.35 um and BSIM3 transistor models is used...
An impedance matching method applicable to UHF-RFID tags mounted on optical discs, where the main radiating element is the disc metallic layer (from now on optical disc-based tags) is presented in this paper. Such a method provides a very simple analytical approach and allows us to obtain any arbitrary matching level at the desired frequency, by using only one reactive element as a matching network...
This paper demonstrates a method to achieve low input impedance and a non-constant gain-bandwidth product using SiGe NPN and PNP devices in order to attain a large bandwidth and gain in transimpedance amplifiers (TIA) for optical communication. The major obstacle to achieving wide bandwidth and high gain in a TIA design is the large parasitic capacitance associated with the input photo-diode. This...
Recent advances in technology have driven renewed interest in the design of CMOS negative capacitance circuits for diverse applications such as wideband metamaterials and radio frequency integrated circuits. In practice, the particular CMOS fabrication process generally limits the practical range of capacitance values and bandwidths that can be achieved. In addition, the reactive component of the...
A transimpedance amplifier is a common preamplifier solution for a capacitive charge/current detector, and is widely used in optical communication. The concept is ideal for a mass spectrometry (MS) system, in particular the Fourier-Transform Ion Cyclotron Resonance (FT-ICR) MS, the MS with the highest resolution and the highest mass accuracy. To push the performance toward a prospective goal of single-ion...
This paper presents a folding scheme to address fundamental issues of planar electrically small resonant antennas with small radiation resistance, high Q factor, and narrow bandwidth. Two printed folded helical antennas are investigated as examples of small antennas for GSM1800/1900 bands. Dramatic bandwidth enhancements of as much as 66% and 163% are found, respectively, for folded helical dipole...
A novel and simple structure for improving CMRR is introduced. This structure can be added to the circuits like folded cascode amplifier, telescopic amplifier, current buffers, .etc to improve the CMRR of these circuits. This simple and effective circuit uses common mode deviating technique to improve CMRR at least 12dB while preserves CMRR bandwidth which is a novel technique in order to improve...
This paper presents the design of a wide bandwidth high performance CMOS realization of dual-output second generation current conveyor (CCII±) at 32nm technology node. HSPICE simulation shows that voltage and current bandwidths in excess of 10GHz are obtained, thus making the module quite suitable for applications in the microwave range of frequencies. Besides, the circuit is able to operate at reduced...
This paper presents the design of a wide bandwidth high performance CNFET realization of dual-output second generation current conveyor (CCII±) at 32nm technology node. HSPICE simulation shows that voltage and current bandwidths in excesss of 22GHz are obtained, thus making the module quite suitable for applications in the microwave range of frequencies. Besides, the circuit is able to operate at...
This paper presents the investigation of vertically folded monopoles on a circuit board, where the two radiation arms are at the top and bottom dielectric surfaces, respectively, connected through vias at the end. It basically maintains the same antenna area of a printed monopole since the clearance is necessary on the opposite side. Two types of miniaturized resonant folded monopoles including L-shape...
A technique for power-bandwidth scaling of a current feedback amplifier (CFA) is presented. By employing current gain, instead of the feedback resistance, to alter the closed-loop bandwidth of the CFA, the proposed approach is shown to provide 30% quiescent power savings for a bandwidth variation of 10MHz to 100MHz. Parasitic extracted simulations are performed in a 0.18μm CMOS process with a power...
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