Impact of the Input Baseband Impedance on the Instantaneous Bandwidth of Wideband Power Amplifiers

Barros, Diogo R.; Nunes, Luís C.; Cabral, Pedro M.; Pedro, José C.

doi:10.1109/mwsym.2019.8700872

Cited by 2 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…31. This result complements the IMD3 measurements that were performed in [13], by showing that even if one could filter out the outof-band IMD components at the output, the improper input baseband profile also generates in-band distortion that can only be removed with DPD.…”

Section: Table I Model Parameterssupporting

confidence: 76%

“…For PA1, both the simulated and measured average efficiencies have a sharp degradation of nearly 8% immediately above 200 MHz, where the impedance presented by the IMN at the baseband is closer to the parallel resonance. This is also the frequency region where the linearity of the PA is most degraded with an increase in the third-order IMD power of 15 dB, with respect to the initial tone separation of 10 MHz, as presented in the conference article [13].…”

Section: Table I Model Parametersmentioning

confidence: 85%

“…However, the input baseband impedance impact on the wideband PA's efficiency is still largely unexplored and commonly ignored during the design stage. Only more recently, the mechanism of efficiency degradation associated with the input baseband impedance was introduced in [13], explaining that if it is not properly addressed, a bias fluctuation is generated, inducing a severe linearity and efficiency degradation in scenarios that require a very wide instantaneous bandwidth.…”

mentioning

confidence: 99%

“…Therefore, the aim of this article is to expand the analysis presented in [13], explaining in a comprehensive, qualitative, and quantitative way, how the bias fluctuation generated by the baseband impedance terminations affects the PA performance This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see http://creativecommons.org/licenses/by/4.0/ when excited with a wideband signal.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Impact of the Input Baseband Terminations on the Efficiency of Wideband Power Amplifiers Under Concurrent Band Operation

Barros

Nunes

Cabral

et al. 2019

IEEE Trans. Microwave Theory Techn.

Self Cite

View full text Add to dashboard Cite

This article presents a theoretical explanation of the efficiency degradation in wideband radio frequency power amplifiers (RFPAs) under concurrent dual-band operation that is still visible after eliminating all known causes related to the output matching network (OMN). First, the origin of this degradation, identified by the reduction of the PA's efficiency and linearity, is traced to the input baseband impedance terminations. Then, a theoretical model that describes the phenomenon and qualitatively predicts the efficiency variation under concurrent dual-band operation is presented using a simple model based on two-tone excitation. Finally, the proposed explanation is confirmed by comparing the efficiency performance of two 30-W GaN RFPAs of distinct instantaneous bandwidth determined by different input video-bandwidth terminations, under two-tone and concurrent dual-band operation. This article shows that, in addition to the adequate OMN design, an optimal input baseband impedance profile is also an important design constraint needed to keep the efficiency and linearity performance of RFPAs, for scenarios that require a wide instantaneous bandwidth.

show abstract

Section: Table I Model Parameterssupporting

confidence: 76%

Section: Table I Model Parametersmentioning

confidence: 85%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations