Class-b/c doherty power amplifier

A technology of amplifiers and power splitters, applied in power amplifiers, amplifiers, radio frequency amplifiers, etc., can solve problems such as difficult to design DPA, low gain, etc.

Active Publication Date: 2018-05-29
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low gain is a key issue when approaching mmWave, making it difficult to design a DPA with sufficiently high PAE

Method used

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  • Class-b/c doherty power amplifier
  • Class-b/c doherty power amplifier
  • Class-b/c doherty power amplifier

Examples

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Embodiment Construction

[0079] The present technology now will be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the technology are shown. However, the technology may be embodied in many different forms, and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the technology to those skilled in the art. Throughout the description, like reference numerals refer to like elements.

[0080] Figure 1a is a schematic illustration of an amplifier arrangement 100 comprising an input power splitter 101 configured to split an input signal 102 into a power P m The first signal 103 and has power P athe second signal 104 of the second signal 104; the main transistor 105, which is connected to the power splitter and arranged to receive the first signal 103, the main transistor is conf...

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Abstract

It is provided an amplifier arrangement for optimizing efficiency at a peak power level and a back-off power level gamma. The amplifier arrangement comprises an input power splitter dividing an inputsignal into a first signal having a power Pm and a second signal having a power Pa, a main transistor operating in a class-B like mode receiving the first signal, an auxiliary transistor operating ina class-C mode receiving the second signal. The received first and second signals have a phase offset value theta, wherein -pai<theta<pai, the amplifier arrangement further comprises a combining network. Circuit element values of the combining network, the power Pm and the power Pa, the phase offset value theta, a bias condition of the auxiliary transistor; and a relative size Saux of the auxiliary transistor, are based on a predetermined back-off power level gamma, a current scaling factor rc of the auxiliary transistor, a main transistor oversizing factor ro,m, and an auxiliary transistor oversizing factor ro,a, where rc<1, ro,m>=1 and ro,a>=1. It is also provided a method for determining properties for an amplifier arrangement.

Description

technical field [0001] The invention relates to amplifier arrangements, methods for determining properties of amplifier arrangements, computer programs and computer program products. Background technique [0002] Modern communication systems typically employ signals with high peak-to-average power ratio (PAPR) to improve spectral efficiency. However, the efficiency of a conventional Class AB power amplifier (PA) degrades rapidly when the output power backs off from its maximum value. Efficiency in fallback can be improved by incorporating power amplifiers into special transmitter / PA architectures such as Doherty, W.H. Doherty "A New High Efficiency Power Amplifier for Modulated Waves" Institution of Radio Engineers Proceedings, Vol. 24, No. 9 , pp. 1163-1182, September 1936, Inverting or dynamic load modulation. Due to its relative simplicity and high performance, Doherty PAs are widely used in commercial applications. [0003] The basic principle of Doherty operation is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F3/193H03F3/21
CPCH03F1/0288H03F3/193H03F3/211H03F2200/451H03F2203/21106
Inventor W.哈尔伯格M.奥泽恩C.发格
Owner TELEFON AB LM ERICSSON (PUBL)
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