A Study on the Bandwidth of the Transformer Matching Circuits

Tanaka, Satoshi

doi:10.1587/transfun.2021gcp0002

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…Furthermore, in the case of the differential method, there are additional merits such as the reduction in the influence of the emitter parasitic inductor, cancelation of the 2nd harmonic, and the reduction in the power supply bypass capacitance value. We believe that the differential method is desirable as a power combining technology for HPUE-compatible PAs [42].…”

Section: Output Power Combining Technologymentioning

confidence: 99%

Evolution of Power Amplifiers for Mobile Phone Terminals from the 2nd Generation to the 5th Generation

Tanaka

Mukai

Imai

et al. 2022

IEICE Trans. Electron.

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Mobile phone systems continue to evolve from the 2nd generation, which began in the early 1990s, to the 5th generation, which is now in service. Along with this evolution, the power amplifier (PA) is also evolved. The characteristics required for PA are changing with each generation. In this paper, we will give an overview of the evolution of PAs from the 2nd generation mobile phones such as GSM (global system for mobile communications) to the 5th generation mobile phones that is often called NR (new radio), in particular, the circuit system. Specifically, the following five items will be described. (1) Ramp-up and ramp-down power control circuit corresponding to GSM, (2) Self-bias circuit technology for improving linearity that becomes important after W-CDMA (wideband code division multiple access), (3) Power mode switching methods for improving efficiency at low output power, (4) Power combining methods that have become important since LTE (long term evolution), and (5) Backoff efficiency improvement methods represented by ET (envelop tracking) and Doherty PA.

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Section: Output Power Combining Technologymentioning

confidence: 99%