The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present a non-contact, on-wafer, broadband device and component testing methodology scalable to the THz band. The “contactless” probe setup is based on radiative coupling of vector network analyzer test ports onto the coplanar waveguide environment of monolithic devices and integrated circuits. Efficient power coupling is achieved via planar, broadband, antennas that act as the “virtual” probe-tips...
A novel technique for verifying the calibration of systems, such as vector network analyzers, used for measuring air-filled metal-pipe rectangular waveguides is presented. The key aspect of the proposed method is that the verification device can be reconfigured to enable its characteristics to be changed by known amounts. The device introduces relative changes in its reflected and transmitted waves...
This paper describes the scattering parameters magnitude measurement and uncertainty comparison using different vector network analyzer (VNA) calibration algorithms at millimeter frequencies with WR10 (75 to 110 GHz) waveguides. The state of the art two port calibration algorithms Thru-Reflect-Line (TRL) and Quick Short-Open-Load-Thru (QSOLT) are considered in this comparison. The dimensional measurements...
Inherent low frequency noise is a ubiquitous phenomenon, which limits operation and performance of electronic devices and circuits. This limiting factor is very important for nanoscale electronic devices, such as 2D semiconductor devices. In this work, low frequency noise in high mobility single crystal MoS2 grown by chemical vapor deposition (CVD) is investigated. The measured low frequency noise...
Most microwave power standards adopt calorimetry techniques to calibrate the effective efficiency of a thermistor mount as transfer standard. Correction factor of the calorimeter is the key coefficent. To correct the influence of the power loss of the transmission line to the thermopile in the calorimeter, a thin copper flat foil will usually be put before the mount's input port to terminate the signal,...
A three-harmonic time-domain load-pull measurement system, which operates up to 40 GHz for the highest harmonic, is demonstrated. The system uses a 50-GHz nonlinear vector network analyzer. The load generator is comprised of three synchronized signal generators and a harmonic combining network using cascaded broadband diplexers, as well as an optional mechanical tuner. Load-pull measurements are validated...
This paper reports the first experimental application of the recently reported quasi-exact inverse (QEI) for memory-polynomial or memory-spline models in the design of a digital predistorter (DPD) linearizing a power amplifier (PA). In comparison to indirect learning architecture, where the coefficients of the DPD are extracted by swapping the input and output variable in any PA model, the DPD extraction...
Application of the unscented transformation (UT) and higher order unscented transformation (HOUT) are considered for uncertainty analysis. Using the principle that a set of discretely sampled points can be used to calculate mean and covariance, we can analyze nonlinear systems without the linearization steps and without defining the Jacobian matrix. An important example is presented.
We demonstrate characterization of an on-chip spiral inductor up to 40 GHz based on a one-tier multi-line TRL method and compare it with a conventional two-tier method. We provide details of the calibration standard design. Monte-Carlo based uncertainty analyses demonstrate the repeatability of the measurement results. A comparison of the measurement results with full-wave simulation results shows...
This paper proposes a 2-D rational function based behavioral modeling approach for concurrent dual-band trans-mitters. It has been shown with measurement data that the recursive property of rational function model, being closer to the physical analogy of PA as feedback system, allows for more accurate modeling. Based on good performance of 2-D rational function, a novel two-step model has been proposed...
This p aper deals with the measurement of cell suspensions at millimeter wave frequencies between 30 GHz and 110 GHz using a CPW test fixture and an on-wafer network analyzer set-up. The measurement results show that yeast cell suspension with concentration as low as 4 million cells/ml or 4 cells/nl can be distinguished from water by their dielectric constants at millimeter wave frequencies. High...
By using a neural network approach that takes into account input/output relationship data along with derivative information in the training process, a fast and straightforward methodology to obtain the quasi-static model of GaN FETs is introduced. This method uses data obtained from pulsed I/V and S-parameter measurements to train three different neural networks which model the drain current, as well...
A fast characterization method to determine the optimal second harmonic injection required at the input for enhancing the efficiency of RF power amplifiers is demonstrated. The second harmonic is injected with a small frequency offset to automatically sweep the phase during one modulation cycle. The power amplifier performance figures of merit are characterized over the second-harmonic amplitude and...
Broadband microwave receivers with electronic warfare applications often exhibit frequency variations that degrade performance. Most notably, a negative gain slope is inherent to an RF/Microwave receiver chain, in-part, because of attenuation that results from frequency-dependent ohmic losses in the dielectric. We present a novel approach to tunable gain slope equalization that solves this problem...
This paper presents a method of vector network analyzer calibration using ‘Thru-Short-Delay’ for one-port measurements, which is expected to give a comparable accuracy to the TRL technique as it does not accompany cable movements. It uses a one-port VNA (Vector Network Analyzer) to avoid cable movements with ‘OSL’ (Open-Short-Load) calibration standards, which are widely used for one-port measurements,...
This article presents a new method of accuracy verification of calibrated vector network analyzers based on the modified calibration comparison technique. The method is of particular interest for low frequency ranges as well as for cost-effective S-parameter measurement systems where the use of conventional ripple test and precision reference air line standards may be impractical and/or relatively...
A novel measurement approach combined with measuring line is proposed and investigated to complete the work of multifrequency signal measurement. Namely, the signal is measured by using microwave measuring line based on space Fourier transformation (SFT) method. In addition, good result is obtained through the method, when simulation is taken in LabVIEW and automatic measuring line system is used...
A novel and a robust synthesis technique for designing broad-band matching network is described. Such a matching network will be designed as a band-pass filter that provides broad-band match while absorbing device parasitic within the matching network. This matching network is used in designing a broad-band class AB power amplifier with a flat large signal gain of 12 dB with ±1 dB variation at saturation...
A method is introduced for determination of a vector network analyzer's calibration residual errors for measurement of the reflection coefficient. The method utilizes unscented Kalman filtering and spline interpolation time domain techniques. All three residual errors are calculated by processing the measured reflection coefficient of a single verification device, such as an air line terminated with...
Mm-wave pulse profile measurements can present challenges in part due to high multiplication factors sometimes needed, the position of stimulus modulation (often part way in a multiplier chain), video poles present in some of the elements and generally more difficult linearity questions. These issues have been explored in the 80–500 GHz range and the behavior between modulation and final multiplication...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.