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Broadband 20- \Omega 20-W Load Suitable for Characterization of Switch-Mode Amplifiers

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6 Author(s)
Pursche, U. ; Ferdinand-Braun-Inst. fur Hochstfrequenztechnik, Berlin, Germany ; Flucke, J. ; Wentzel, A. ; Freyer, S.
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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 20 Ω) below -10 dB over almost two frequency decades from less than 50 MHz 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.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:59 ,  Issue: 9 )