Efficient Doherty Feed-forward Linear Power Amplifier for CDMA 2000 Base-Station Applications

Dalwadi, Gaurav; Shah, Brijesh; Verma, Vivek; Kurkure, Girish; Sharma, Ram; Bhatnagar, Pulkit

doi:10.1109/icscn.2008.4447157

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Where V=[f 1 (8) µ A and µ P represent the iteration factor for vector V and vector P, respectively, e A,k =Gr k -H(V k R A,k ), e P,k =θ k -Φ(F(r k )). H(·) represents the AM/AM conversion of PA, Φ(·) represents the AM/PM conversion, θ k is the phase of input signal.…”

Section: Polynomial Based Pre-distortion Methodsmentioning

confidence: 99%

“…Therefore, measures should be taken to eliminate (mitigate) the negative effects that PAs nonlinearity introduces. Various methods have been proposed in the past years such as feed-forward technique [1], Linear amplification with Non-linear Components (LINC) technique [2], digital pre-distortion techniques, etc.. Among these techniques, the digital base-band pre-distortion techniques are the most promising one and it has attracted more and more attention nowadays due to its excellent performance and its easiness in hardware implementation.…”

Section: Introductionmentioning

confidence: 98%

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Analysis on Polynomials Employed in Pre-Distortion for Power Amplifiers

Zhong

Jiang

et al. 2010

2010 IEEE 72nd Vehicular Technology Conference - Fall

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In this paper, we focus on three different polynomial formats used in power amplifiers (PAs) pre-distortions. The nonlinearity of AM/AM and AM/PM introduced by power amplifiers are revealed by the transfer characteristics of PAs. We pick out the most effective polynomial format in evaluation of relative MSE (RMSE), the convergence speeds and the power spectral density (PSD). Such effective polynomial format is of great importance in PAs pre-distortion based on polynomial methods, in which the pre-distortion can be made more stable. The above mentioned aspects are all demonstrated through computer simulations and corresponding analysis.

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Section: Polynomial Based Pre-distortion Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Analysis on Polynomials Employed in Pre-Distortion for Power Amplifiers

Zhong

Jiang

et al. 2010

2010 IEEE 72nd Vehicular Technology Conference - Fall

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“…Numerous efficiency enhancement techniques such as Envelope Elimination and Restoration (EER) (or Kahn) [6] [7], Envelope Tracking (ET) [8] [9], Linear Amplification using Nonlinear Components (LINC) [10], and Symmetrical and Asymmetrical Doherty have been proposed [11] [12]. Although, EER and LINC are providing better performance than ET, their circuit implementation is more complex and involved tedious tuning process.…”

mentioning

confidence: 99%

Modified Output Combining 3-Stage Doherty Power Amplifier Design for LTE Micro eNodeB

Shah¹,

Thakker²,

Dalwadi³

et al. 2015

IJWMT

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This paper presents a highly efficient modified output combining 3-stage Doherty Power Amplifier (DPA) design using low power LDMOS transistor for Band 40, TD-LTE Micro eNodeB. In this design, modified output combining technique has been used in the output section which meets the output power requirements of Micro eNodeB which cannot be achieved by conventional 3-stage DPA. The modified DPA design achieves 65.3% power added efficiency (PAE) at 39 dBm average output power with 20 MHz LTE signal using 15 watt LDMOS Transistor. 3-stage modified output combining technique increases the linear output power by 1.1 dB and increases the Gain flatness versus power level. The use of Digital Pre-Distortion (DPD) along with modified 3-stage DPA design achieves the linearity requirements as per the 3GPP specifications. The modified DPA combining technique has provided potential economical solution by using low power LDMOS transistor with an advantage of high efficiency.

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