Power-Amplifier Stabilization Through Out-of-Band Feedback

Sear, William; Barton, Taylor W.

doi:10.1109/lmwc.2020.3002727

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Since the proposed architecture introduces an explicit low‐frequency feedback structure in the PA, its stability must be analysed to verify that the feedback path for IMD3 suppression will not induce oscillations. The presence of a low frequency feedback path around a PA does not necessarily destabilise the circuit, and in fact can be used as a stabilisation mechanism at the frequencies where the feedback path is present [35]. In this work, the PA is first stabilised following standard RF techniques with a parallel RC network at the gate to ensure unconditional stability in the conventional shorted‐baseband design case.…”

Section: Baseband Feedback Network Stabilitymentioning

confidence: 99%

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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Section: Baseband Feedback Network Stabilitymentioning

confidence: 99%

Wideband IMD3 suppression through negative baseband impedance synthesis

Sear

Barton

2021

IET Microwaves Antenna & Prop

Self Cite

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“…Therefore, developing a power amplifier that can operate reliably and deliver optimal performance across various frequency ranges is a challenging task [1][2]. To tackle these challenges, innovative techniques such as Doherty, Envelope Tracking, and Out phasing have been developed [3][4].…”

Section: ░ 1 Introductionmentioning

confidence: 99%

Design and Implementation of a Two-Frequency Power Amplifier without Interference for Wireless Communication

Saad Ahmed,

Jasim Hadi Al-Chaabawi,

Atiyah Itwayya

2023

IJEER

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In this research paper, we will delve into a type of circuit known as a power amplifier. This circuit is designed to operate at two frequencies, allowing it to perform tasks at each frequency. The main goals of the design are to separate signals and ensure proper operation of the circuit in different modes. One notable feature of this power amplifier is its ability to work without any distortion, especially when both frequencies are used simultaneously. Achieving this has been made possible by combining a method that ensures signal termination with a strategy that enables their separation. To evaluate its performance, we conducted computer simulations as tests using both large signals. The findings indicate a 10.2 decibel increase in amplification, with an output power of 41.2 decibels measured in milliwatts (dBm) and an overall power efficiency of 40.2% at a frequency of 1.8 gigahertz. Furthermore, our research reveals that the suppression of signals for the 1.8 GHz band is reduced by 49 decibels compared to the original signal, while for the 2.6 GHz band, almost all traces of the second harmonic signal are completely eliminated. In addition, we propose a circuit that mitigates mixing outcomes and enhances linearity performance. The EDA software, Path Wave EM Design, is used for simulation purposes.

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Power-Amplifier Stabilization Through Out-of-Band Feedback

Cited by 2 publications

References 11 publications

Wideband IMD3 suppression through negative baseband impedance synthesis

Wideband IMD3 suppression through negative baseband impedance synthesis

Design and Implementation of a Two-Frequency Power Amplifier without Interference for Wireless Communication

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