Inverted asymmetric Doherty power amplifier driven by two-stage symmetric Doherty amplifier

325W HVHBT Doherty Final and LDMOS Doherty Driver with 30dB Gain and 54% PAE Linearized to -55dBc for 2c11 6.5dB PAR

“…We observed greater than 54% PAE at 75W (48.77dBm) average output power with 30dB gain while achieving -55dBc linearized ACPR at 5MHz offset using a 2C11 WCDMA input signal with 6.5dB PAR. This same lineup also achieved 48.5% PAE at 50W (47dBm) average output power with 29.5dB gain while achieving -55dBc linearized ACPR at 5MHz offset using a 2C11 WCDMA input signal with 8.0dB PAR, exceeding results reported for 2-stage results reported for GaN [4] and LDMOS [5].…”

A Doherty Power Amplifier with Large Back‐Off Power Range Using Integrated Enhancing Reactance

“…To further improve the back-off efficiency, various DPAs, such as asymmetric DPAs and multistage DPAs, have been investigated to achieve large BOP range [13][14][15][16]. These two kinds of DPAs utilize excessive modulation current of the peaking amplifier to achieve enlarged load span of the carrier amplifier for extended BOP range, leading to tradeoffs between design complexity, cost, and power utilization factor.…”

A high‐linearity Doherty power amplifier using Metamaterial based on ferroelectric ceramics

“…To fulfill these requirements, some techniques have been proposed. [1][2][3][4][5] The technique based on adaptive input-power distribution is introduced to enhance linearity and efficiency of DPA in. 1 And linear amplification using nonlinear components technique is presented in 2 to improve the linearity of highefficiency nonlinear amplifier by driving them with constantenvelope signals.…”

“…Besides, the bandwidth extension technique of the GaN DPA is also proposed for improving efficiency and linearity. 3 In addition, the wideband phase inverter and Composite Right/Left-handed (CRLH) transmission lines structures are also adopted to suppress harmonic, 4,5 which the linearity of DPA is improved obviously. However, the phase of these presented DPAs cannot be change flexibly to desired level, and the improving of IMD3 is very limited.…”

“…In addition to interport isolation measurement for dual port antenna, the envelope correlation coefficient over the required frequency range has been calculated and plotted using S 11 , S 22 , and S 21 measurement results to endorse the performance of dual port implemented antenna for diversity applications. 1,4 MIMO techniques are also very useful to improve the performance of wireless and mobile communication systems by minimizing the multi path propagation effect. 5,6 The MIMO antenna plays an important role to improve the overall performance of MIMO systems.…”