A Closed-Form Design Technique for Ultra-Wideband Doherty Power Amplifiers

Toward a More Generalized Doherty Power Amplifier Design for Broadband Operation

“…Table I shows a comparison between different DPA topologies, from which it can be seen that for ߙ = 1/√2 the generalized DPA is reduced to the parallel DPA and for ߙ = 1 the generalized DPA is reduced to the conventional DPA, implying that parallel DPA and conventional DPA are essentially a subset of the generalized DPA. In addition, it is observed that the DPA designs reported in [27], [29] and [28] have α=0.6, 0.6 and 0.4, respectively. Hence, the method presented in this paper helps classifying various DPA topologies.…”

“…The same output combiner structure was adopted in [27] and [28] [ 29], an approach to find the exact values of this combiner parameters was presented, however, the approach provided sophisticated formulae that permitted negative characteristic impedances for TL2 and TL3. Moreover, other techniques have been proposed to design wideband DPAs such as digital DPA [5], three-way sequential DPA [30], and DPA with an output combiner comprised of a branch-line coupler [31].…”

Enhancing Power Efficiency of Doherty Power Amplifiers Using Windowing Based Crest Factor Reduction Technique

“…For the experimental evaluation of the proposed method a 12 W GaN based Doherty power amplifier [24] was used, whose photo is shown in Fig. 5(a).…”

“…Therefore, it is generally simplified into Wiener, Hammerstein, WienerHammerstein or generalized memory polynomial models (GM P DP D ) [20]. GM P DP D reduces Volterra's model complexity [20][21][22][23][24]. For this work, indirect learning architecture has been used to construct the GM P DP D , which eliminated the need for a model assumption and parameter estimation of the power amplifier [21,22].…”

A Broadband High-Efficiency Doherty Power Amplifier With Integrated Compensating Reactance

“…To overcome this problem, various design approaches have been proposed to extend the bandwidth of DPA [7]- [21]. A transformer-less load-modulated architecture was proposed in [8], which extended the bandwidth by eliminating the use of output impedance transformer and offset lines.…”