Memory models for behavioral modeling and digital predistortion of envelope tracking power amplifiers

Tafuri, Felice Francesco; Sira, Daniel; Nielsen, Troels S.; Jensen, Ole Kiel; Mikkelsen, Jan H.; Larsen, Torben

doi:10.1016/j.micpro.2015.01.006

Cited by 11 publications

(3 citation statements)

References 27 publications

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“…fs,ch and fp,ch are the start and stop frequencies, respectively, of the desired channel. [6], each for a different number of coefficients.…”

Section: Behavioral Modeling Resultsmentioning

confidence: 99%

“…Other causes of hysteresis effects include the dynamic variation of the amplifier chip temperature [12]. The PA operation under time-varying supply voltage in the ET scenario can also cause an additional hysteresis effect in the AM/PM conversion [6], [13]. We use the FIR filter in cascade with the static AM/PM nonlinear model in order to consider the hysteresis behavior in the AM/PM nonlinearity.…”

Section: Hysteresis Effectsmentioning

confidence: 99%

“…An important property of the Saleh model for the constantsupply voltage is that it can be mathematically inverted to obtain a digital predistortion [14]- [15]. The modulated supply voltage vs is considered a new independent variable in a DISO DPD modeling scenario to account for the nonlinear distortion due to the dynamic variation of the supply voltage [4], [6], [13], [11]. This section presents the DPD model which consists of two functions, the AM/AM DPD function which is used to linearize the PA gain, and the AM/PM DPD function which is used to linearize the PA phase.…”

Section: Proposed Digital Predistortionmentioning

confidence: 99%

See 2 more Smart Citations

Hysteresis nonlinearity modeling and linearization approach for Envelope Tracking Power Amplifiers in wireless systems

Al-kanan

Tafuri²,

2018

Microelectronics Journal

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Novel Dual-Input Single-Output (DISO) behavioral modeling and linearization techniques for Envelope Tracking Power Amplifiers (ET PAs) in wireless application are presented in this paper. The proposed modeling approach applies the Hammerstein structure for the Amplitude-to-Phase (AM/PM) conversion. An extension of the Saleh AM/PM model is also proposed to model the static nonlinearity in the ET PA AM/PM conversion. This paper presents a new linearization technique for ET PAs by inverting the proposed ET PA model and using it as a Digital Predistortion (DPD). The measurement results show that both the proposed model and DPD can clearly outperform both the original Saleh model and the DPD based on the Saleh model inversion. Compared to the state-of-the-art behavioral models for ET PAs, the proposed model and DPD can offer an improved complexity-accuracy trade-off thanks to the lower number of coefficients.

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“…fs,ch and fp,ch are the start and stop frequencies, respectively, of the desired channel. [6], each for a different number of coefficients.…”

Section: Behavioral Modeling Resultsmentioning

confidence: 99%