Power Up Potential Power Amplifier Technologies for 5G Applications

Efficiency Analysis of Concurrently Driven Power Amplifiers

“…6 has an asymptotic limit value, except for some special k values. Both the fundamental components of w 1 and w 2 in i dsp (t) are tending to be 0.25, the DC component in i dsp (t) is approaching an ideal value: 2 π 2 ≈ 0.2026, which the final ideal DE (where GLCM [1, k] is large enough to ensure there is ideally no effect from the inter-modulation products) is approaching π 2 16 ≈ 61.69%. The calculated values fluctuate for some k values like k = 1.5, 2, 2.5, 3…”

“…The rapid evolution of wireless communication systems (WCS), especially the ongoing 5G, along with the Industrial 4.0 [1], [2], leads to a variety of communication standards and additional frequency bands. With the application of technologies like Carrier Aggregation (CA), Software Defined Radio (SDR) and Multiple Input Multiple Output (MIMO), these standards and bands generally result in increasing requirements for radio frequency (RF) transmitters operating in multi-band or multi-standard mode [2]- [5]. As the most challenging and expensive component in the RF front-end of the transmitter, RF power amplifiers (PAs) are expected to handle diverse signals at different frequencies while meeting the requirements of signal quality and power efficiency [6].…”

“…The associate editor coordinating the review of this manuscript and approving it for publication was Jing Bi . however, it is not cost-effective from the network's capital and operating expenses perspective [2], [7]. Hence, a transmitter capable of operating at multiple frequencies concurrently is urgently needed [8].…”

Design of continuous high‐efficiency broadband linear power amplifier using two‐tone signal analysis

“…To achieving maximized data transmission speed, especially the coming 5G, linear PA with broader bandwidth and higher efficiency are urgently required. [1][2][3] Multitudinous of linear technologies are well-developed, such as Doherty technology, pre-distortion technologies, feedback or feedforward technologies and so on. [3][4][5] However, methods involve feed controlling or digital processing will face enormous difficulties with the operating frequency and bandwidth increasing.…”

“…[1][2][3] Multitudinous of linear technologies are well-developed, such as Doherty technology, pre-distortion technologies, feedback or feedforward technologies and so on. [3][4][5] However, methods involve feed controlling or digital processing will face enormous difficulties with the operating frequency and bandwidth increasing. 6,7 By enhancing the performance at output power back off areas, the linear Doherty shows a tremendous linearity with high efficiency when operating at a narrow band, nevertheless, even though latest reported novel Doherty could break the limitation of λ/4 impedance transformer to achieve broader bandwidth, however, the bandwidth and linearity is hard to maintain simultaneously.…”