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the elements of the equivalent circuit at a given bias point; the optimisation routine varies them until the S-parameters of the equivalent circuit are as close as possible to the measured ones, in the whole frequency band of interest. Alternatively, Y -parameters or any other linear equivalent parameters can be tted. The optimisation can be performed for each bias point separately or for all the data from all bias points of interest at once [29]. In the former case, the risk is that the optimised values of the parasitic elements vary from bias point to bias point, contrary to the assumption: this is an indication of bad topology or bad optimisation. In the latter case, the parasitics are forced to have the same values at all bias points; however, the numerical burden greatly increases. In both the cases, the optimisation algorithm risks to get trapped in local minima, never reaching the absolute minimum. The goal function is usually not very sensitive to some elements, whose values are therefore rather uncertain. This can be a problem for some applications: for example, the gate resistance in an FET is dif cult to extract from normal, operating-point Sparameters, but its value is meaningful for the evaluation of the noise performances of the device. If this is the case, it is wise to adopt the global tting procedure, also including special bias point as in the two-tier procedure (see below). On the other hand, this approach has a remarkable advantage: it is very easy to change or adjust the topology of the equivalent circuit and have a fast feedback on its tting accuracy. In addition, it is not restricted or dedicated to any topology or device, and there is no need to develop dedicated software.

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for evaluating the acceptability of methods of analysis as well as guidelines on single-laboratory and interlaboratory validation of methods [75 78]. For singlelaboratory validation, CCMAS defends the harmonized IUPAC guidelines [4]. On the international level, also ILAC provides guidelines on pro ciency testing [79] and accreditation [80, 81] (Table 3). 8.2.3.3 Approaches for Evaluating Acceptable Methods of Analysis The purpose of an analytical method is the deliverance of a qualitative and/or quantitative result with an acceptable uncertainty level. Therefore, theoretically, validation boils down to measuring uncertainty . In practice, method validation is done by evaluating a series of method performance characteristics, such as precision, trueness, selectivity/speci city, linearity, operating range, recovery, LOD, limit of quanti cation (LOQ), sensitivity, ruggedness/robustness, and applicability. Calibration and traceability have been mentioned also as performance characteristics of a method [2, 4]. To these performance parameters, MU can be added, although MU is a key indicator for both tness for purpose of a method and constant reliability of analytical results achieved in a laboratory (IQC). MU is a comprehensive parameter covering all sources of error and thus more than method validation alone.

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Figure 7.26 HSDPA power vs. required average cell throughput [18].

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As in the previous interferometer, the exiting light beams cannot interfere, since one of them is linearly polarized at 45 and the other is circularly polarized. If an analyzer is rotated in front of the interfering light beams coming out of the beam splitter, the interference pattern appears, since only the components along the axis of the polarizer, forming an angle y with the x axis will pass through it. It can be proved that the interference patterns transmitted with the analyzer at an angle y and at an angle y 90 are complementary. The phase depends on the angle of the analyzer, but for this arrangement with a nonpolarizing beam splitter, the fringe contrast is maximum only at the analyzer angles y 45 . 2.3. COHERENCE REQUIREMENTS The size (spatial coherence) and monochromaticity (temporal coherence) of the light source must satisfy certain minimum requirements that depend on the geometry of the system, as described by Hansen (1955, 1984) and by Birch (1979). It is interesting to know that if the optical element under test has very steep re ections, the state of polarization of the light may change in the re ection, introducing changes in the contrast (Ferguson, 1982). However, in most of the cases, the important factor in the contrast is the coherence of the light source. 2.3.1. Spatial Coherence The light source for interferometry must satisfy some minimum requirements of spatial as well as temporal coherence, depending on the interferometer con guration and the speci c application and needs. As described in 1, Section 1.1.2., some gas or vapor lamps can be used in conjunction with a small pinhole to illuminate an interferometer. These lamps with the pinhole do not have perfect

The Generic PDF Parser dialog box is the same as the PDF Image Import dialog box. The method of selecting a given page from within the multi-page document is exactly the same as discussed earlier when we looked at importing PDFs with the

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