Title :
Calibration of a metallic access network analyzer
Author :
Boets, Patrick ; Van Biesen, Leo ; Temmerman, Serge
Author_Institution :
Dept. Elec, Free Univ. Brussel, Brussels, Belgium
fDate :
6/24/1905 12:00:00 AM
Abstract :
A calibration approach is proposed to compensate for the systematic errors when the input reflection coefficient of a metallic access network cable is obtained using single port measurements from an access network analyzer. The analyzer is a versatile instrument and uses optimal cable matching and internal balancing to achieve maximum measurement resolution. The analyzer uses test-leads connected to a fixed bridge structure, but with an adaptable balance and match impedance, and two variable synchronous acquisition channels so that the calibration can be split up into the non-parametric determination of the fixed part and a parametric determination of the variable part. The outcome of the non-parametric calibration is nine frequency dependent coefficients, and shows as an important side product the autobalance procedure. The parametric calibration will result in two 35 item sets of coefficients of rational functions in the S-domain. The parametric calibration depends on frequency domain system identification where the order of the numerator and denominator polynomials of the rational functions are not fixed.
Keywords :
S-parameters; bridge circuits; calibration; digital subscriber lines; frequency-domain analysis; impedance matching; network analysers; rational functions; telecommunication cables; S-domain rational functions; adaptable balance bridge; analyzer internal balancing; analyzer test-leads; autobalance procedure; calibration procedures; fixed bridge structure; fixed part nonparametric determination; frequency dependent coefficients; frequency domain system identification; impedance matching bridge; measurement resolution; metallic access network analyzers; network cable input reflection coefficient; optimal cable matching; parametric calibration; rational function coefficient sets; rational function denominator polynomials; rational function numerator polynomials; single port measurement systematic errors; subscriber loop applications; variable part parametric determination; variable synchronous acquisition channels; Bridges; Calibration; Frequency dependence; Frequency domain analysis; Impedance; Instruments; Polynomials; Reflection; System identification; Testing;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2002. IMTC/2002. Proceedings of the 19th IEEE
Print_ISBN :
0-7803-7218-2
DOI :
10.1109/IMTC.2002.1007119