Architecture and Analysis of Sub-Nyquist Rate Sampling for Behavioral Modeling of Wideband Power Amplifiers

Youngcheol PARK  Hyunchul KU  

IEICE TRANSACTIONS on Electronics   Vol.E93-C    No.10    pp.1544-1547
Publication Date: 2010/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.1544
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: Electronic Components
beharvioral model,  memory effect,  power amplifier,  sampling,  

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For the modeling of power amplifiers (PAs) using sub-Nyquist-rate sampling (sub-sampling), a quadratic down-converting architecture with a parallel-cascade method is suggested. Its performance was analyzed regarding the sampling rate below the input Nyquist rate. As a result, the model from the sub-sampling below the input Nyquist rate characterized long-term memory effects whereas the memoryless model could not. The measurement results from RF PAs with the mWiMAX signal verified the modeling performance of this architecture. Also, for the modeling of memoryless PAs, it was shown that this sub-sampled model is still effective regardless of the sampling rate.