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Wideband and reconfigurable Doherty based amplifier

An amplifier and main amplifier technology, applied in the directions of amplifiers, improving amplifiers to improve efficiency, components of amplifying devices, etc., can solve the problems of limiting Doherty amplifiers, OPBO efficiency deterioration, lack of Doherty amplifiers, etc.

Active Publication Date: 2014-01-08
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In most practical implementations, this thus makes P FEP is a fixed parameter, which limits the potential for using Doherty amplifiers in reconfigurable multi-standard applications
[0021] When broadband / multi-standard equipment is highly required, at the design frequency (typically the center frequency f 0 ) at frequencies other than the deterioration of the efficiency of the OPBO and the reconfigurable P FEP The absence of both is a major drawback of the Doherty amplifier sized according to Table 1

Method used

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  • Wideband and reconfigurable Doherty based amplifier
  • Wideband and reconfigurable Doherty based amplifier
  • Wideband and reconfigurable Doherty based amplifier

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Embodiment Construction

[0051] The invention will now be described with reference to Figures 4-8. Combined with the description of the background technology part Figure 1-3 . Except that the electrical length of the main amplifier transmission line does not necessarily have to be at the center frequency f in all examples and embodiments of the invention 0 beyond a quarter of the wavelength at which figure 1 The topology of the Doherty amplifier in is also used in the power amplifier of the present invention. This will be further explained below.

[0052] The new power amplifier is based on the topology of the Doherty amplifier and provides the same efficiency performance as the Doherty amplifier at the center frequency. Among other things, it has greatly extended bandwidth and provides efficiency curve reconfiguration without any tunable circuit components.

[0053] The invention is not limited to the use of a particular type of transistor. If a power transistor of the FET type (Field Effect T...

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Abstract

The invention provides a power amplifier comprising a main amplifier and an auxiliary amplifier. The power amplifier is arranged to deliver an output power Pout . A First Efficiency Peak (FEP) is defined as the first efficiency peak in the power ratio Pout to Pout max. Pout max is the maximum power output of the power amplifier and PFEP defines the power ratio at the FEP, wherein: the main amplifier is arranged to be biased by a main amplifier bias Vds, m being substantially equal to an auxiliary amplifier bias Vds, m, Vds, a times xb , xb being a main amplifier output current in relation to the maximum current through the main amplifier when Pout=PFEP, and the impedances of a load ZL and a main amplifier transmission line are arranged to be substantially equal. The invention also provides a corresponding method and a node in a wireless communication system comprising the power amplifier.

Description

technical field [0001] The present invention relates to the field of microwave power amplifiers for use in electronic systems, such as radio base stations (RBS) used in wireless communication systems. Background technique [0002] The efficiency of radio and microwave power amplifiers (PAs) continues to be improved in order to reduce their power consumption. The telecommunications industry consumes approximately one percent of the world's annual global energy consumption, a large share of which is allocated to radio base stations (RBS). Therefore, high efficiency power amplifiers are important. In RBS, more than 80% of the energy consumption is related to the radio equipment, amplifiers and cooling system, the number can be reduced by increasing the power amplifier efficiency. [0003] In modern communication standards (eg 3G, 4G, LTE, WiMax, etc.), the desired output signal has a peak-to-average ratio (PAR) of typically 7-10 dB. In order to obtain high average efficiency...

Claims

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Application Information

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IPC IPC(8): H03F1/02
CPCH03F1/0288Y02B60/50
Inventor 戴维·古斯塔夫森克里斯蒂安·法格尔
Owner TELEFON AB LM ERICSSON (PUBL)