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This paper presents the needed interface geometry from device characterization process that is required for a comprehensive set of load-pull data. It also shows the method to obtain this geometry when the dielectric material used for characterizing the active device is different from the one used for the amplifier. The basics of load-pull method for device characterization are used to make the case...
A square holey cladding waveguide is designed and fabricated to support TE and TM polarizations for 180 GHz to 360 GHz chip-to-chip communication. The mode profile and normalized output power of the waveguide are simulated. A fabricated waveguide is tested using a vector network analyzer for mode mapping and loss measurements. The mode profile was mapped using a 250 μm pinhole stepped across the waveguide...
Fast tuning of a new evanescent-mode cavity tuner is demonstrated to optimize amplifier device power-added efficiency in simulations. The tuning is accomplished by adjusting the two resonant frequencies of the two-element tuner network with a modified interval halving approach. The tuner model is used to adjust the load impedance presented to a power amplifier device. Simulation results show that...
A new approach is introduced for wireless detection of electromagnetic signals generated at low frequencies on macula by light pulses. The signal detection is based on a resonant condition created externally and no part of the device touches the patient. Since most biological signals are excited at low frequencies, the proposed method will be applicable to other wireless detection systems including...
This paper presents a multi-phase clock generation technique, which employs coupled oscillators with capacitive-coupling to achieve both low-power and low-noise characteristics. An oscillator core equipped with both dual tanks and adaptive biasing feedback is proposed. To prove the concept, a four-core coupled oscillator is fabricated in a 130nm CMOS RF SOI process. The VCO RFIC achieves measured...
Simulation results for several novel shapes of dielectric inserts that can serve as effective process seals for a standard WR-90 waveguide-to-coax adapter are presented. The objective of the design is to modify a standard adapter as a convenient wave launching structure for the measurement of fields in the interior regions of a complex machine. Modifying the geometry of the process seal insert has...
This work presents the study of a 5 GHz synthesized Chebyshev combline filter and its potential use in a self-structuring filter prototype. The self-structuring filter prototype will be a system where the center frequency and bandwidth can be controlled by an algorithm to produce the desired bandpass filter response. The impact of tuning capacitances on the insertion loss, 3 dB bandwidth and percent...
This paper presents a GaN-on-Si HEMT Class AB Power Amplifier (PA) delivering watt level power in the 870 MHz band with a power added efficiency (PAE) of 55.4% at 30dBm, and ACPR of −35.5dBc for a 3.84MHz WCDMA signal with 7.5dB PAPR. The PA achieves 45.2% fractional bandwidth, spanning from 600–950 MHz with more than 10dB gain. This PA was implemented using surface mount components that have values...
A highly efficient two-stage 15 GHz fully-integrated GaN power amplifier (PA) designed for 5G communication is reported. SPICE simulations show this two-stage PA achieves an output 1 dB compression POUT, 1dB = 32.2 dBm with 28.2 dB gain and 30.0% PAE (power-added efficiency) for CW operation at 15 GHz. Its PAE reaches 38.7% at POUT = 34.0 dBm with a gain of 22.0 dB. Simulations also suggest that dynamic...
Unconditional stability is often a desired criterion in amplifier design. The Smith Tube, a three-dimensional cylindrical extension of the Smith Chart with center frequency represented on the height axis, can be used as a tool to design an unconditionally stable amplifier. The stability circles taken over frequency are extended into a stability surface in the Smith Tube representing regions of stability...
Carrier aggregation supports an increased total bandwidth, data rate and utilization of available fragmented spectrum, where the latter is a core component of next generation Wi-Fi and Cellular networks, including 5G. Wireless communications receivers with intra-band non-contiguous CA, employing conventional complex mixers and base-band circuitry, are desirable, however risks of VCO injection pulling...
In this paper, we present two microwave devices at 1 GHz for next-generation wireless communication systems. The first device is a magnet-less circulator that consists of three resonant branches connected in a delta topology and spatio-temporally modulated with 120 deg phase difference between each other. The proposed circulator is fully compatible with standard CMOS technologies and holds the promise...
A numerical method developed for a time-domain propagator solution of Maxwell's equations is presented. Numerical equations for the present time fields at each grid point are expressed as a combination of the adjacent previous time fields. A primary advantage of the Propagator Method is that all fields are coincident in time and space. The methods discussed here include extrapolation in time, necessary...
This paper introduces a broadband conductor-backed coplanar waveguide (CBCPW) to double-sided parallel strip line (DSPSL) transition structure. The performance is demonstrated in a back-to-back (B2B) configuration on 0.127 mm thick FR408 with relative permittivity of 3.75 and loss tangent of 0.018. AWR AXIEM and ANSYS HFSS simulations have been used to optimize all the structures. Simulation and measurement...
Future RF photonic systems offer the promise of wideband front-end operation, but are limited by linearity in the electrical-to-optical conversion process. This paper presents a fifth-order polynomial predistortion circuit for optical Mach-Zehnder modulator linearization. Inclusion of independently tunable polynomial coefficients provides the flexibility to suppress both third-order (IM3) and fifth-order...
This paper presents a 3-FET stacked K/Ka-band class-AB power amplifier (PA) implemented in the GLOBALFOUNDRIES 45nm SOI process that is particularly optimized for future high-performance energy-efficient 5G mm-Wave transceiver front-ends. With a 2.9V power supply, the PA achieves 13.1dB power gain and a saturated output power (Psat) of 16.2dBm with a maximum power-added efficiency (PAE) of 41.5% at...
To lower the overall cost of an optical cavity biosensor, while still taking advantages of highly sensitive Fabry-Perot based optical cavity structures, we have proposed the use of two low cost, off-the-shelf laser diodes and employ a scaled differential calculation method instead of monitoring the intensity changes of a single laser diode. This paper describes three of the benefits of using the scaled...
Low-profile, power-efficient antennas are required for body-worn devices applicable for long-term healthcare monitoring. The paper is focused on the fabrication of fold cylindrical helix (FCH) antennas, and measurement of their performance on the human body. The study considers one-element and two-element FCH arrays. It is found that the fabricated FCH antenna can excite the same on-body propagation...
This paper focuses on analyzing orbital angular momentum in radio frequency systems by studying Laguerre-Gaussian beams. A MATLAB toolkit for optics has been utilized to provide a predictive framework for generating and multiplexing signals that experience orbital angular momentum at 73 GHz. A horn antenna and spiral phase plates are used to verify MATLAB results. Comparing the two methods in terms...
Multi-function monolithic microwave integrated circuits (MMIC) such as those used in phased array radar systems are typically implemented using processes that incorporate both enhancement and depletion-mode FETs. Although the combination of the two FET types is ideal for integrating digital content on MMICs, these processes have frequency and power density limitation. If an integrated solution could...
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