A 28-/37-/39-GHz Linear Doherty Power Amplifier in Silicon for 5G Applications

Affliate: Georgia Institute of Technology
Author: Hua Wang, Song Hu
Index Terms: Doherty, transformer
Publisher: MTT
Score /5: ⭐️⭐️⭐️⭐️⭐️
Type: Journal
Year: 2019

☘️BackGround

Global spectrum allocations for mm-wave 5G

United States	27.5-28.35GHz	37-38.6GHz	38.6-40GHz	64-71GHz
Europe	24.5-27.5GHz
China	24.5-27.5GHz	37.5-42.5GHz
Japan	27.5-29.5GHz
South Korea	26.5-29.5GHz
Australia	24.25-27.5GHz	39GHz

5G Tech Requirements

1. These 5G waveforms have large peak-to-average power ratios (PAPRs) and lead to circuit design challenges
2. should be energy efficient in power back-off (PBO) to extend the battery life and ease the thermal management.
3. need to be highly linear in a wide power range for both their amplitude and phase responses to ensure the quality of service

Insufficient

1. inefficient active circuits or passive networks.
2. improve the efficiency with increased overhead in the power management unit
3. PBO efficiency enhancement techniques

Tech	Cost
Mode-switching PAs	entail challengs to achieve dynamic powermode switching at the speeds of broadband 5G signals’ envelopes
Outphasing PAs	require the generation of highspeed outphasing signals（需要产生高速outphasing信号）, which demands significant baseband overhead
Envelope tracking (ET) PAs	require high-speed supply modulators with wide dynamic ranges（高速、高动态范围调制器）, and the stateof-
the-art ET designs demonstrate modulation bandwidth only up to tens of megahertz

☘️Innovation Points

☘️Schematic and Performance

☘️Paper in 3 Sentences

☘️References