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A Short-wave ultra-wideband balanced amplifier with high linearity and lower noise based on balanced structure is presented. The amplifier is realized by Equilibrium structure, Balun broadband matching, Coupler feedback and Power backoff technology. Equilibrium structure is used to greatly improve the second order distortion and Lossless coupler feedback to reduce the noise. The RF frequency is 1...
A W-band double-balanced down-conversion mixer for automotive radars using standard 90 nm CMOS technology is reported. The mixer comprises a double-balanced Gilbert cell with inductive source-degeneration RF transconductance stage for RF-port input matching bandwidth and conversion gain (CG) enhancement, a Marchand balun for converting the single RF input signal to differential signal, a Marchand...
A miniaturized broadband balun IC in 180-nm CMOS is presented for millimeter-wave applications. The balun IC is designed so that high impedance ratio between the even and odd modes is achieved by utilizing Electro-magnetic solver suitable for planer structure. The fabricated balun IC in 180-nm CMOS process occupies only 0.03 mm2. The balun IC exhibits an amplitude imbalance of less than 0.9 dB and...
A short-wave broadband mixer with high linearity based on double-balanced structure is presented. The mixer is realized by double-balanced passive COMS FET array and balun technology. The channel-width and the bias-voltage of the FET are adjusted to optimize the mixer's performance. The balun is implemented by radio frequency ferrite transmission line transformer that has low insertion loss over wide...
An original design and prototype for the first-time reported low-cost inkjet printed 1:4 GHz planar, multi-layer transformer is presented. The proposed transformer is a balun and consists of a three-parallel turns center-tapped primary coil and a two turns, including overpasses, secondary coil for conformal and rollable antenna applications. The hosting substrate is Liquid Crystalline Polymer (LCP)...
This paper presents the design and simulation of High gain Source degenerated Cascode LNA for Wi-max and W-CDMA applications at 3.5GHz. The design uses an enhanced cascade topology to attain improved forward gain and noise figure. Th is design includes lumped elements like inductor, capacitor and resistors to design input and output matching networks. The targeted narrow-band gain, impedance matching...
Two rectennas are presented. One consists of a printed 5Ω antenna, connected to a loaded voltage doubling rectifier through a LC impedance matching network. The other one consists of a printed loop antenna, complex conjugately impedance-matched to the same rectifier. The second rectenna is reduced in size by a factor of more than four with respect to the first rectenna and showing a 55% RF-to-DC power...
A liquid-metal reconfigurable log-periodic balun is presented. The design consists of three sections that can be independently actuated with pressure-driven liquid metal, resulting in a planar balun that is capable of switching between three continuous bands from 1.89 to 8.45 GHz. The two output ports have a magnitude balance within 1 dB and a phase difference within 10° of 180°.
This work presents a development of multi-way transmission-line resistance compression networks (TLRCNs) and their application to rf-to-dc conversion. We derive analytical expressions for the behavior of TLRCNs, and describe two design methodologies applicable to both single- and multi-stage implementations. A 2.45-GHz 4-way TLRCN network is implemented and applied to create a resistance-compressed...
In this paper a highly linear-dual band RF front-end (LNA and Mixer) for IR-UWB (IEEE 802.15.4a) applications is proposed. LNA exploits a common-gate (CG) stage in parallel to a common-source (CS). It performs single-ended to differential-ended operation, avoiding balun stage. It features 18 dB maximum gain, <4 dB noise figure and +4 dBm inband third-order intermodulation intercept (IIP3). A double-peak...
403-MHz fully differential RF LNA was designed and implemented using 0.13 µm CMOS process. This design was targeted for low-power and low-cost direct conversion applications such as short-range radio in biomedical devices. This design consists of a differential CG-CS LNA with a positive- negative-feedback technique. The LNA occupies 150 µm× 120 µm active chip area, which is approximately 50% of that...
A new isolated Drive-by-Microwave (DBM) gate driver with a high-speed voltage monitoring for over current detection is proposed, which is composed of a 2.4GHz GaN/Si DBM transmitter, DBM receiver chip and compact isolated couplers in a low-cost printed circuit board. The fabricated DBM gate driver demonstrates a 200 Mbps isolated data transmission and a GaN power switching device's driving with a...
In this paper it will be shown a way to characterize RF Digital-to-Analog Converters (DACs) by means of Scattering Parameters. This allows an RF engineer, to understand which are the mismatches of a specific device relatively to its ideal behavior. Several measurement results will be presented for different DAC configurations and compared with ideal responses.
A 190.8–244GHz solid-state power amplifier MMIC is presented demonstrating 50–80mW Pout at 0.5mW Pin and 1.77W PDC. This represents >20dB of large-signal gain across 53GHz of high-power bandwidth, where PAE is 2.8–4.5%. This 3-stage amplifier has >28dB S21 gain from 207–271GHz, peak 35dB S21 gain at 220GHz, and >30dB S21 gain from 210–238GHz and from 256–268GHz. A power-cascode cell topology...
A Short-wave ultra-wideband balanced amplifier with high linearity and lower noise based on balanced structure is presented. The amplifier is realized by Equilibrium structure, Balun broadband matching, Coupler feedback and Power backoff technology. Equilibrium structure is used to greatly improve the second order distortion and Lossless coupler feedback to reduce the noise. The RF frequency is 1...
A short-wave broadband mixer with high linearity based on double-balanced structure is presented. The mixer is realized by double-balanced passive COMS FET array and balun technology. The channel-width and the bias-voltage of the FET are adjusted to optimize the mixer's performance. The balun is implemented by radio frequency ferrite transmission line transformer that has low insertion loss over wide...
An olfactory display is a gadget to present scents to a user. In this study, we developed the tablet PC-compatible olfactory display using a surface acoustic wave (SAW) device and eight micropumps. The olfactory display can blend multiple kinds of odorants with the specified recipe. A SAW device can atomize even the scents of low volatile odor compounds which typically require much time to be released...
The ability of a load-independent Padé nonlinear behavioural model to help design the output matching network of a Power Amplifier (PA) is shown for the first time. 50Ω Padé models are extracted at the frequencies of interest, and then the extracted models are used to perform load-pull simulations. The purpose is to find the Smith chart regions for maximum power delivery and drain efficiency in order...
In this paper, the development of a Q-band doubly balanced mixer in 0.15um GaAs pHEMT process is presented. Five-conductor coupled line Marchand balun is designed and utilized for the LO and RF signal input. Instead of using conventional input port matching method, the complex impedance of the diode ring is directly matched with differential single-stub networks between the balun and diode ring, which...
An ultra-low-leakage RF pulse generator capable of producing very narrow RF pulses with small rising and falling time for short-range high-resolution radar and high-data-rate communication systems is developed using 0.18-μm BiCMOS technology. The RF pulse generator exhibits an extremely-low RF leakage implementing the RF leaking suppression technique, in which the RF leaking signal is cancelled by...
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