- Full text PDF available (21)
In this paper we present a new measurement solution for the characterization of high frequency devices under large signal operating conditions. It is shown how a device-under-test (DUT) is put under large signal operating conditions and how one then measures the voltage and current waveforms at the signal ports in order to completely and accurately… (More)
— This paper presents the Volterra input-output map as an extension of the S-parameters towards weakly nonlinear RF and microwave devices. This 'VIOMAP' can be measured and it can be used to predict the behavior of cascaded nonlinear two-ports.
We analyze the input networks of the samplers used in the nose-to-nose calibration method. Our model demonstrates that the required input network conditions are satisfied in this method and shows the interconnection errors are limited to measurement uncertainties of input reflection coefficients and adapter S-parameters utilized during the calibration… (More)
—A new pulsed-IV pulsed-RF measurement system using a large signal network analyzer (LSNA) is proposed to address the problem of desensitization afflicting conventional pulsed-RF measurement systems. Several extraction methods using the entire spectrum measured by the system are presented to extract non-desensitized pulsed-RF S-parameters of a transistor.… (More)
OBJECTIVES The aim of this study was to evaluate the effectiveness of a new minimally invasive surgical procedure, the Trans-obturator Vaginal Tape (TOT) in the treatment of female urodynamic stress incontinence (USI) and to analyse functional results and quality of life after one year of follow up. MATERIAL AND METHOD 120 consecutive women with stress… (More)
A measurement and black-box modeling technique is described enabling the characterization of nonlinear microwave components under periodic large-signal excitation. First, the mathematical model is theoretically described. The model is based on the assumption that the superposition principle holds for the effect of all spectral components, except the… (More)
— Using a nonlinear black-box model based on the Volterra theory it is possible to describe the nonlinear behavior of a high frequency amplifier. Acquiring only a strongly reduced set of measurements it is easy to predict the load impedance curves anywhere on a Smith Chart. The classic load-pull approach involves the acquisition of a large amount of data… (More)
—It is shown in this paper how the classical concept of the " network analyser " can be extended towards modulated and large-signal operating conditions. The concept is demonstrated by measuring the saturated behaviour of a MMIC amplifier, excited by modulated signals with CDMA characteristics. It is then illustrated how the measured data can be used to… (More)
— Novel generic frequency domain behavioural models are constructed for mixers and amplifiers. The modelling is based upon three concepts: time-invariant describing functions, linearisation and multidimensional curve fitting. The model parameters can be calculated based upon measured or simulated data. Model performance is illustrated on practical examples.
—The modeling and balancing of IQ modulators and the development of linearization techniques for power amplifiers (PA) such as output baseband modulation (OBM) benefit from the availability of linear and nonlinear MIMO Volterra system parameters involving both baseband and RF signals. A triggered LSNA system is reported for this purpose. By synchronizing… (More)