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This paper proposes a high resolution wideband calibration procedure for RF time-domain measurement of nonlinear devices. This calibration is based on the use of wideband multi-sine signal and is applied to a 4 channel Track and Hold Amplifier (THA) based measurement setup. The absolute magnitude and phase calibration is performed with a calibrated coherent interleaving sampling oscilloscope as reference...
In this paper an analytical derivation of vector network analyzer (VNA) measurement uncertainties due to non-ideal calibration standards for unknown thru calibration (UOSM or UXYZ) is presented. Simple equations for the sensitivity coefficients are obtained. This allows a deep insight into the error propagation mechanism as well as an easy implementation into calibration software.
Process variations influence the accuracy of designs and yield in production. This paper addresses the implementation of these variations in large signal FET models, with particular attention on the organization of measurements as to speed up the direct extraction of the model parameters.
A novel extended formulation of the “continuous mode” voltage waveform equation is presented for RF power amplifiers. This leads to the complete determination of a new design tool termed the “second harmonic clipping contour”. This tool allows the designer to quantify the effect of a non ideal fundamental load impedance on the Class B/J second harmonic matching conditions. This tool is shown to enable...
This paper is concerned with the behavioral modeling and predistortion of power amplifiers used with discontinguous multi-band signals with wide band separation. A new 2D multisine excitation signal is proposed to assist with the system identification of such PAs. The experimental application of this new 2D multisine excitation to a GaN HEMT PA reveals that the normalized PA outputs of both band saturates...
Hybrid Filter Banks (HFBs) are becoming essential systems for several RF applications, such as the development of advanced mixed-domain receivers for Cognitive-Radio scenarios. For the proper design of its digital part, an accurate representation of its analog block transfer function becomes mandatory. In this paper, a new method to measure the response of the HFB Analysis Filter Bank (AFB) is reported...
We analyze the uncertainties of a complex permittivity extraction procedure based on uncorrected scattering-parameter measurements of coplanar waveguides of different lengths. The uncertainty calculations are performed with the Monte-Carlo method and the sensitivity analysis implemented in the NIST Microwave Uncertainty Framework. We investigate the uncertainty contributions of the input quantities...
Vector Network Analysis can be applied to equipment where the input and output ports are spatially disparate and not easily connected to conventional network analyzer equipment by adding a fiber optic transmitter and a fiber optic receiver connected by fiber optic cable. Due to the very low distortion of fiber optic cable, long lengths of this cable may be used to perform measurements without introducing...
The manuscript presents a comparison between nonlinear and linear de-embedding procedures for the identification of the I/V dynamic characteristics at the transistor current-generator plane. These approaches, without the need for modeling device trapping and thermal effects, allow to retrieving the waveforms of the electrical quantities at the current generator that governs device performance in terms...
A new microwave method capable of contactless thickness measurement of metal sheets with high resolution has been proposed. First experimental results in X-band are reported. The method is based on precise interferometric phase evaluation of a signal reflected step by step from two surfaces of a metal sheet whose thickness is to be measured. This is achieved using interference between the reflected...
Precision coaxial airline electrical characteristics can be derived from their physical properties such as physical dimensions and material properties. Characterizing a precision airline requires accurate physical measurements of the airline's internal diameter, lengths of outer and center conductors, pin depth, surface finish and material properties. Characteristic impedance, which is calculated...
For the first time, intermodulation distortion of micro-electromechanical capacitive switches in the actuated state was analyzed both theoretically and experimentally. The distortion, although higher than that of switches in the suspended state, was found to decrease with increasing bias voltage but to depend weakly on modulation frequencies between 55 kHz and 1.1 MHz. This dependence could be explained...
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