A New Approach to Design a Broadband Doherty Power Amplifier via Dual-Transformation Real Frequency Technique

Meng, Fan; Zhu, Xiao‐Wei; Xia, Jing; Yu, Chao

doi:10.1109/access.2018.2868238

Cited by 20 publications

(9 citation statements)

References 33 publications

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“…According to (14)- (16), the real parts of Z M and Z A can be properly controlled by setting the values of…”

Section: Proposed Output Matching Network Synthesis Methods a Dermentioning

confidence: 99%

“…The values of d 1 and c 2 , for given frequency, are then deduced using 17- (18). Subsequently, the values of d 2 , c 1 and θ are determined numerically while satisfying 14- (16). So far, the values of…”

Section: Proposed Output Matching Network Synthesis Methods a Dermentioning

confidence: 99%

“…The associate editor coordinating the review of this manuscript and approving it for publication was Xiu Yin Zhang. multi-band CA), multiple techniques have been proposed to enhance the operation bandwidth of DPAs, including: multistage topologies [11], [12], a multi-way architecture [13], a bandwidth-estimation-method to design the combiner circuitry [14], simplfied real frequency technique based methodology to synthesize the combining network [15], [16], current-biased DPA techniques [17], an auxiliary-reactancecompensation approach [18], and various modified DPA configurations [19]- [23].…”

Section: Lte-advanced (Lte-mentioning

confidence: 99%

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Two-Port Network Theory-Based Design Method for Broadband Class J Doherty Amplifiers

Fang

Jundi

et al. 2019

IEEE Access

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This paper proposes a new methodology for designing wideband Class J Doherty power amplifiers (DPAs). The paper begins by presenting a network analysis that leads to a set of design equations to govern the synthesis of the combiner network parameters that satisfy Class J load requirements. The combiner network produces a complex-to-complex Doherty load modulation capable of avoiding potential transistor voltage clipping due to a mismatch between the fundamental and harmonic impedances. Consequently, this method improves the high power AM-AM characteristic and reduces the DPA's peak power variation versus frequency. A wideband Class J DPA was designed as a proof-of-concept demonstrator to operate from 2.7 GHz to 4.3 GHz. Under continuous wave stimuli, over the entire band, the measured AM-AM distortion in the Doherty region of the fabricated DPA was found to be lower than 1.2 dB with a relatively constant output power of 38.9 ± 0.3 dBm at saturation. Moreover, good drain efficiencies of about 42% and 54% were recorded at 6-dB output back-off and saturation powers, respectively. In addition, the linearizability of the fabricated DPA was confirmed under both intra-and inter-band carrier-aggregated signal stimuli. In fact, measurements using an 80 MHz inter-band carrier-aggregated signal revealed that the proposed DPA could deliver an adjacent channel leakage ratio of better than −48 dBc after digital pre-distortion with a good average drain efficiency of 45%-49% over the entire band of interest.

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“…According to (14)- (16), the real parts of Z M and Z A can be properly controlled by setting the values of…”

Section: Proposed Output Matching Network Synthesis Methods a Dermentioning

confidence: 99%

Section: Proposed Output Matching Network Synthesis Methods a Dermentioning

confidence: 99%

Section: Lte-advanced (Lte-mentioning

confidence: 99%

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Two-Port Network Theory-Based Design Method for Broadband Class J Doherty Amplifiers

Fang

Jundi

et al. 2019

IEEE Access

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“…Therefore, how to enhance the bandwidth of DPA so that DPA can continue to play an important role in 5G communication systems has become a huge challenge for PA research. In recent years, several technologies have been proposed to solve this problem, such as simplified real frequency technology (SR FT) [12]- [14], post matching technology [15]- [17], continuous mode DPA [CM-DPA] [18]- [20]. Apart from these technologies, the expansion of the DPA bandwidth can also be effectively realized by improving the load modulation network (LMN) architecture, which is easy to be implemented.…”

Section: Introductionmentioning

confidence: 99%

A Broadband Doherty Power Amplifier With a New Load Modulation Network

et al. 2021

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In this paper, we proposed a new load modulation method to improve bandwidth and efficiency at output power back-off (OBO) of the Doherty Power Amplifier (DPA). The quarter wavelength transmission line behind the combination point of the impedance inverter was replaced with a dualfrequency matching circuit to matche the impedance value of the combination point to the load impedance in this method. The dual-frequency matching was used to compensate for the frequency dispersion effect that occurs in the traditional impedance inverter network and to a certain extent solves the bandwidth limitation of the Doherty power amplifier. To verify the proposed theory, a broadband high-efficiency power amplifier was designed and manufactured for 5G mobile communications. Measurement results show that the designed DPA is in the range of 2.4-3.7GHz, the saturated output power is above 42dBm, the saturated drain efficiency is 61.2%-68.4%, and the 6dB back-off efficiency is 49.7%-61.4%.INDEX TERMS Doherty, load modulation network, dual-band, broadband, high efficiency, 5G

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“…[10][11][12] Recently, several broadband PAs have also been reported based on RFT or SRFT. [13][14][15][16] In these designs, however, all distributed elements in the synthesized MN are in series. This is quite unfriendly for DC feed, which is usually provided through an extra shunted short stub.…”

Section: Introductionmentioning

confidence: 99%

A novel direct matching network synthesis technique and its application to broadbandclass‐Jpower amplifier

Zeng

Chen

Wang

et al. 2020

Int J RF Microw Comput Aided Eng

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A novel direct matching network (MN) synthesis method improving the conventional simplified real frequency technique (SRFT) is presented in this article. By straightforwardly optimize the characteristic impedance (physical width) and electrical length (physical length) of each distributed element in a preselected configuration, the proposed method has one more degree of design freedom by comparison with the SRFT, and therefore increases design flexibility and matching effects. To demonstrate its effectiveness, a broadband class-J power amplifier (PA) is devised for which both the input and output MNs are realized using the proposed method. The simultaneous manipulation of fundamental and second harmonic impedances is successfully realized by defining a novel target function that indicates the degree of proximity for the realized impedances to the optimal transistor impedances. Comprehensive equations and complete design procedures of the new technique are given. The measured class-J PA implemented for verification achieves an output power of 39.2 to 42.3 dBm and power-added efficiency of 61.8% to 71.6% over the frequency range of 2.5 to 3.8 GHz using a 10-W GaN HEMT. A 20-MHz LTE-A signal is employed to validate the linearization capability of this class-J PA. An adjacent channel leakage ratio level around −43.8 dBc is achieved after utilizing digital predistortion technique.

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A New Approach to Design a Broadband Doherty Power Amplifier via Dual-Transformation Real Frequency Technique

Cited by 20 publications

References 33 publications

Two-Port Network Theory-Based Design Method for Broadband Class J Doherty Amplifiers

Two-Port Network Theory-Based Design Method for Broadband Class J Doherty Amplifiers

A Broadband Doherty Power Amplifier With a New Load Modulation Network

A novel direct matching network synthesis technique and its application to broadbandclass‐Jpower amplifier

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