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A Broadband Asymmetrical GaN MMIC Doherty Power Amplifier with Compact Size for 5G Communications
| Content Provider | MDPI |
|---|---|
| Author | Cheng, Peisen Wang, Quan Li, Wei Jia, Yeting Liu, Zhichao Feng, Chun Jiang, Lijuan Xiao, Hongling Wang, Xiaoliang |
| Copyright Year | 2021 |
| Description | This paper proposes a broadband asymmetrical monolithic microwave integrated circuit (MMIC) Doherty power amplifier (DPA) using 0.25-μm gallium-nitride process with a compact chip size of 2.37 × 1.86 mm2 for 5G communication. It adopts an unequal Wilkinson’s power divider with a ratio of 2.5:1, where 71.5% of the total power is transferred to the main amplifier for higher gain. Different input matching networks are used to offset phase difference while completing impedance conversion. This design also applies a novel topology to solve the problem of large impedance transformer ratio (ITR) in conventional DPA, and it optimizes the ITR from 4:1 to 2:1 for wider band. Moreover, most of the components of the DPA including power divider and matching networks use lumped inductors and capacitors instead of long transmission line (TL) for a smaller space area. The whole circuit is designed and simulated using Agilent’s advanced design system (ADS). The simulated small-signal gain of DPA is 8–11 dB and the saturation output power is more than 39.5 dBm with 800 MHz band from 4.5 GHz to 5.3 GHz. At 6-dB output power back-off, the DPA demonstrates 38%–41.3% power added efficiency (PAE), whereas 44%–54% PAE is achieved at saturation power. |
| Starting Page | 311 |
| e-ISSN | 20799292 |
| DOI | 10.3390/electronics10030311 |
| Journal | Electronics |
| Issue Number | 3 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-01-28 |
| Access Restriction | Open |
| Subject Keyword | Electronics Telecommunications Asymmetrical Doherty Power Amplifier (dpa) Monolithic Microwave Integrated Circuit (mmic) Gallium-nitride (gan) |
| Content Type | Text |
| Resource Type | Article |
