Journal ArticleDOI
Doherty Goes Digital: Digitally Enhanced Doherty Power Amplifiers
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TLDR
In this paper, the authors proposed an active load modulation mechanism for Doherty power amplifiers (PAs), which allows the carrier and peaking amplifiers to operate into optimal load-impedance trajectories that vary according to the amplitude of the input signal.Abstract:
Efficiency enhancement techniques for high-power amplification systems are now mature technologies, with Doherty power amplifiers (PAs) being widely used in field-deployed wireless base stations. A typical Doherty PA consists of two parallel amplifiers (a carrier amplifier, biased in class-AB, and a peaking amplifier, biased in class-C), an input analog splitter, and a nonisolated output power combiner. The operation of the Doherty PA is based on an active load modulation mechanism, which allows the carrier and peaking amplifiers to operate into optimal load-impedance trajectories that vary according to the amplitude of the input signal. This, in principle, results in increasing the average efficiency of the Doherty PA without compromising its linearity.read more
Citations
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Journal ArticleDOI
Generalized Theory and Design Methodology of Wideband Doherty Amplifiers Applied to the Realization of an Octave-Bandwidth Prototype
Ramzi Darraji,Dhruv Bhaskar,Tushar Sharma,Mohamed Helaoui,Pedram Mousavi,Fadhel M. Ghannouchi +5 more
TL;DR: In this article, the authors derived a continuum of Doherty power amplifier (PA) solutions with enhanced load modulation over an extended RF bandwidth, analytically shown that Doherty PAs with efficiency peaks at maximum power and at an arbitrary back-off level can be achieved with numerous configurations of output power combiner.
Journal ArticleDOI
Improved Three-Stage Doherty Amplifier Design With Impedance Compensation in Load Combiner for Broadband Applications
TL;DR: In this paper, an impedance-compensating load combiner is proposed to broaden the bandwidth of the three-stage Doherty power amplifier by employing the output impedances of the peaking amplifiers.
Journal ArticleDOI
Breaking Bandwidth Limit: A Review of Broadband Doherty Power Amplifier Design for 5G
TL;DR: In this article, the authors present a comprehensive review of the Doherty power amplifier bandwidth enhancement techniques proposed in literature in order to provide a thorough understanding of the DPA's broadband design for high-efficiency 5G wireless transmitters.
Journal ArticleDOI
Breaking the Bandwidth Limit: A Review of Broadband Doherty Power Amplifier Design for 5G
TL;DR: These new application scenarios impose stringent requirements on wireless transceiver front ends and call for special considerations at the circuit and system design levels, including power amplifiers (PAs) to accommodate complex modulated signals.
Journal ArticleDOI
Novel Outphasing Power Amplifiers Designed With an Analytic Generalized Doherty–Chireix Continuum Theory
TL;DR: This unified theory developed at the current-source reference planes reveals the performance trade-off achieved by all of the possible power amplifier (PA) combiners within the continuum of solutions and identifies a novel type of dual-input hybrid Chireix–Doherty PA that combines key features of the Doherty and Chirex operations.
References
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Journal ArticleDOI
Optimum operation of asymmetrical-cells-based linear Doherty power Amplifiers-uneven power drive and power matching
TL;DR: In this paper, a Doherty amplifier with uneven input drive and individual matching for the carrier and peaking cells was proposed, where higher input power is delivered to the peaking cell rather than the carrier cell for optimized linear power operation, especially for appropriate load modulation.
Journal ArticleDOI
Frequency Response Analysis and Bandwidth Extension of the Doherty Amplifier
TL;DR: In this paper, a complete frequency response analysis of the Doherty amplifier is presented with the conventional output combining network consisting of two quarter-wavelength (λ/4) transmission lines at a center frequency f 0.
Journal ArticleDOI
Broadband Doherty Power Amplifier via Real Frequency Technique
Guolin Sun,Rolf H. Jansen +1 more
TL;DR: A comprehensive method of designing a broadband Doherty power amplifier is presented, which also takes the output matching networks of both sub-amplifiers into account and the essential limitations of bandwidth extension are discussed.
Journal ArticleDOI
A Modified Doherty Power Amplifier With Extended Bandwidth and Reconfigurable Efficiency
TL;DR: It is theoretically shown that the proposed amplifier can simultaneously provide high efficiency at both full output power and at output power back-off, over a much improved bandwidth compared to the conventional Doherty power amplifier.
Journal ArticleDOI
A Modified Doherty Configuration for Broadband Amplification Using Symmetrical Devices
David Yu-Ting Wu,Slim Boumaiza +1 more
TL;DR: In this paper, a new Doherty amplifier configuration with an intrinsically broadband characteristic is presented based on the synthesis of key ideas derived from the analyses of the load modulation concept and the conventional Doherty amplifiers.