Highly Efficient Concurrent Power Amplifier With Controllable Modes

Sun, Yi-Ran; Zhu, Xiao‐Wei; Zhai, Jianfeng; Zhang, Lei; Meng, Fan

doi:10.1109/tmtt.2015.2486759

Cited by 15 publications

(11 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, in this paper, in-band continuous mode transferring (CMT) technique is employed to design broadband DPAs. By transferring operation between class-J continuum and class-F −1 continuum, the second harmonic space covers the whole edge of the Smith chart [27], [28]. It will be validated in this paper that the in-band CMT technique is suitable to realize broadband DPAs.…”

Section: Introductionmentioning

confidence: 82%

See 1 more Smart Citation

Broadband Doherty Power Amplifier With Transferable Continuous Mode

Gan

Shi

et al. 2020

IEEE Access

View full text Add to dashboard Cite

In this paper, in-band continuous mode transferring (CMT) method is presented for designing broadband Doherty power amplifier (DPA). Specifically, transferable continuous mode, transferring between class-J continuum to class-F −1 continuum, is introduced into DPA at output back-off (OBO) power level for improving bandwidth and efficiency. For validation, a broadband DPA with operation mode transferring from continuous class-J to continuous class-F −1 is designed, fabricated and measured. Experimental results show the drain efficiencies (DEs) of the fabricated DPA are 46.3%-57.7% and 58.4%-69.1% at 6 dB OBO and peaking power levels over 1.7-2.6 GHz. The saturation power of this DPA is 43.1-45.2 dBm with a gain of 9.1-11.2 dB in the interested band. Furthermore, when the fabricated DPA is stimulated by a 20 MHz wideband signal with a peak-to-average power ratio (PAPR) of 7.05 dB at 2.4 GHz, the measured average power is 36.5 dBm with an average DE of 45.7%, and the measured adjacent channel leakage ratios (ACLRs) are −31.9 dBc and −50.4 dBc before and after DPD technique, respectively. INDEX TERMS Broadband power amplifier, Doherty, in-band continuous mode transferring.

show abstract

Section: Introductionmentioning

confidence: 82%

“…At the OBO power level, the normalized first three harmonic impedance spaces of class-J continuum can be derived as [20], While the first three harmonic impedance spaces of the continuous class-F −1 mode can be described as [28],…”

Section: A In-band Cmt At Obo Power Levelmentioning

confidence: 99%

Broadband Doherty Power Amplifier With Transferable Continuous Mode

Gan

Shi

et al. 2020

IEEE Access

View full text Add to dashboard Cite

show abstract

“…In recent years, the CPA has attracted more and more scholars, and many approaches have been reported regarding the study of related CPA technologies. Examples of these studies are the traditional CPA which operates at two fixed frequencies [3], [7], [9], re-configurable CPA, which could work at several different concurrent combinations [10], [11] or applications for other amplifier's structures like concurrent low noise amplifier [8], [12], concurrent Doherty amplifiers [13], uneven concurrent Doherty amplifiers [7], continuous Class-J mode concurrent Doherty [3] dual-band class-E CPA using right/left transmission lines [14], harmonic tune CPAs [5], [15], and Class-F CPA using load coupling networks [16]. These studies are of great values, and stimulated the development of CPA related technologies, like new concurrent structures [10] and digital pre-distortion technologies for CPAs [17], [18], multi-mode PAs [4], [11], [12] and CA technologies [19].…”

Section: Introductionmentioning

confidence: 99%

Efficiency Analysis of Concurrently Driven Power Amplifiers

Tian

et al. 2020

IEEE Access

View full text Add to dashboard Cite

In this work, the properties of a two-tone signal driven concurrent power amplifier (CPA) are analyzed extensively. Firstly, the characteristics of two-tone signals are discussed to explain the nonlinearity and efficiency of two-tone signal driven CPA. Secondly, a method of how to solve the efficiency of a twotone signal driven CPA is proposed in this paper with a detailed calculation procedure and complete theory. Finally, a general empirical expression to calculate the drain efficiency (DE) of CPA versus the frequency ratio and the amplitude ratio of the two carriers is proposed. Simulation results and experimental verifications are given to validate the proposed analytical formulation to predict the efficiency of CPAs when driven with balanced or imbalanced two-tone signals.

show abstract

“…It has become a significant issue to broaden the bandwidth of the power amplifier (PA) for the designers. Nowadays, with the application of ultra‐broadband matching technique, many single‐ended PAs can exceed one octave working bandwidth . The large peak‐to‐average power ratios (PAPRs) of the modulated signal require the PAs to be operated at back‐off (BO) power levels.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, with the application of ultra-broadband matching technique, many single-ended PAs can exceed one octave working bandwidth. [2][3][4][5] The large peak-to-average power ratios (PAPRs) of the modulated signal require the PAs to be operated at back-off (BO) power levels. But the efficiency of the single-ended PA decreases quickly when the power is backed off.…”

Section: Introductionmentioning

confidence: 99%

A postmatching concurrent dual-band Doherty power amplifier with enhanced bandwidth

Meng

Zhu

Xia

et al. 2018

Int J RF Microw Comput Aided Eng

Self Cite

View full text Add to dashboard Cite

In this article, a postmatching concurrent dual‐band (C‐DB) Doherty power amplifier (DPA) is proposed to enhance the bandwidth in each frequency band. The relationship between the phases of carrier and peaking impedance inverting networks (IINs) and the bandwidth of the C‐DB DPA is analyzed for the first time. By designing the carrier and peaking IINs with appropriate minimum phase delays, the bandwidth of C‐DB DPA can be enhanced and balanced in both frequency bands. Based on postmatching technique, load impedance at the combining point is optimized by comparing the DPA's bandwidth at back‐off and saturation. A high‐efficiency C‐DB DPA working at 2.0‐2.4 and 3.2‐3.6 GHz (400 MHz bandwidth each) is designed and fabricated based on commercial gallium nitride HEMTs to validate the proposed technique. Measurement results show that the DPA has a 6 dB back‐off efficiency of 54%‐57% and a saturated efficiency of 70%‐71% at 2.0‐2.4 GHz. At 3.2‐3.6 GHz, the efficiency of 52%‐55% at 6 dB back‐off and 65%‐71% at saturation can be obtained. Modulated signals are also employed to excite the DPA at the two bands. The DPA can achieve an average efficiency of more than 47% at 7 dB back‐off with excellent linearity by utilizing digital predistortion.

show abstract

Highly Efficient Concurrent Power Amplifier With Controllable Modes

Cited by 15 publications

References 12 publications

Broadband Doherty Power Amplifier With Transferable Continuous Mode

Broadband Doherty Power Amplifier With Transferable Continuous Mode

Efficiency Analysis of Concurrently Driven Power Amplifiers

A postmatching concurrent dual-band Doherty power amplifier with enhanced bandwidth

Contact Info

Product

Resources

About