Linear Doherty PA at 5 GHz

Musolff, Christian; Kamper, Michael; Fischer, Georg

doi:10.1109/mmm.2014.2367862

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…The Doherty structure using active load modulation (LM) is also considered one of the most promising design methods for this SDC [3], because of its simple structure, efficient operation over a large output power range, and linear potential introduced by the cancellation between the carrier and peaking transistors [4].…”

Section: Rules and Strategiesmentioning

confidence: 99%

“…As shown in (2), the linearity of DPAs is determined by the carrier PA because the contribution of a peaking PA does not act directly on the output power but rather via the active LM. However, in practice, the output power of the peaking PA can also be transferred from the nonideal components directly into the load; thus, the linearity of the DPA could be enhanced [3]. The linearity of the amplifier is determined solely by the carrier amplifier at low power levels due to the shutting down of the peaking PA.…”

Section: Theory and Designmentioning

confidence: 99%

“…Therefore, the carrier amplifier is always biased at class AB to achieve better linearity and efficiency. When the DPA reaches high power levels, appropriate phase shifting and amplitude adjustment can improve the entire linearity of the amplifier, utilizing the harmonic and intermodulation product cancellation between the carrier PA and the peaking PA [3], [5]. Therefore, the DPA is capable of operating linearly and more efficiently than for conventional class-AB operation PAs [4].…”

Section: Theory and Designmentioning

confidence: 99%

See 2 more Smart Citations

Canceling Intermodulation Products: A High-Efficiency and Linear-Asymmetric Doherty PA

Tian

You

et al. 2019

IEEE Microwave

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Section: Rules and Strategiesmentioning

confidence: 99%

Section: Theory and Designmentioning

confidence: 99%

Section: Theory and Designmentioning

confidence: 99%

See 1 more Smart Citation

Canceling Intermodulation Products: A High-Efficiency and Linear-Asymmetric Doherty PA

Tian

You

et al. 2019

IEEE Microwave

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Wideband IMD3 suppression through negative baseband impedance synthesis

Sear

Barton

2021

IET Microwaves Antenna & Prop

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This article presents a power amplifier (PA) linearisation approach based on synthesising a negative impedance termination at the baseband frequency. Negative baseband termination has been previously shown to suppress intermodulation distortion (IMD) products in power amplifiers. Here, this effect is synthesised using a passive feedback network between the drain and gate bias paths of the PA, so that the IMD is suppressed without an increase in the system complexity. The design targets IMD3 suppression at the PA's 3-dB compression point (P3dB), enabling linear operation into compression, therefore, resulting in improved device utilisation and efficiency. Based on simulation of the feedback response over a 1-200 MHz frequency range, a network topology is designed that provides both the bias structure and the appropriate transfer function for IMD3 suppression, demonstrating the first reported practical structure to realize this behaviour over a wide range of baseband frequencies. Two different transfer functions are implemented and compared in performance to the nominal design case with standard baseband terminations. Due to the feedback nature of the approach, stability is also addressed. The 2.14-GHz proof-ofconcept prototype with feedback exhibits up to 9.5 dB suppression of the two-tone IMD3 over 10-150 MHz tone spacing, without reducing the CW performance of the PA.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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