U. Pursche , J. Flucke, A. Wentzel, S. Freyer, C. Meliani, and W. Heinrich

Published in:

IEEE Trans. Instrum. Meas., vol. 59, no. 9, pp. 2431-2436 (2010).

Abstract:

This paper reports on a broadband dc ground isolated 20-Ω absorber for powers of up to 20 W. The realized absorber achieves reflections (referenced to 20Ω) below-10 dB over almost two frequency decades from less than 50  Hz to 2 GHz. It can be used as load resistor in the characterization of power amplifiers, particularly switch-mode ones, where broadband non-50-Ω loads are required for measurement purposes. An additional advantage is that no bias-T is needed with this solution. This reduces measurement uncertainties due to the parasitics of the bias-T. Using the distributed concept offers a generic technique to realize such loads and also for other impedance values and other applications.

Index Terms:

Absorber, broadband, distributed structure, load, power amplifier, switch mode, termination.

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