Doherty Goes Digital: Digitally Enhanced Doherty Power Amplifiers
| Autor: | Ramzi Darraji, Pedram Mousavi, Fadhel M. Ghannouchi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Engineering
Radiation business.industry Amplifier 020208 electrical & electronic engineering RF power amplifier Electrical engineering Power bandwidth Transistor array 020206 networking & telecommunications 02 engineering and technology Condensed Matter Physics Modulation Current sense amplifier 0202 electrical engineering electronic engineering information engineering Electronic engineering Linear amplifier Bridged and paralleled amplifiers Electrical and Electronic Engineering business |
| Zdroj: | IEEE Microwave Magazine. 17:41-51 |
| ISSN: | 1527-3342 |
| Popis: | Efficiency enhancement techniques for high-power amplification systems are now mature technologies, with Doherty power amplifiers (PAs) being widely used in field-deployed wireless base stations. A typical Doherty PA consists of two parallel amplifiers (a carrier amplifier, biased in class-AB, and a peaking amplifier, biased in class-C), an input analog splitter, and a nonisolated output power combiner. The operation of the Doherty PA is based on an active load modulation mechanism, which allows the carrier and peaking amplifiers to operate into optimal load-impedance trajectories that vary according to the amplitude of the input signal. This, in principle, results in increasing the average efficiency of the Doherty PA without compromising its linearity. |
| Databáze: | OpenAIRE |
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