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Integrated doherty type amplifier arrangement with high power efficiency

A multi-integrated technology for amplifiers, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, improved amplifiers to improve efficiency, etc., can solve problems such as unresolved mutual coupling

Inactive Publication Date: 2008-05-14
NXP BV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the above literature does not address the above problems arising from the mutual coupling due to the variable input impedance and variable output load of the main and peak amplifiers in the Doherty amplifier configuration

Method used

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  • Integrated doherty type amplifier arrangement with high power efficiency
  • Integrated doherty type amplifier arrangement with high power efficiency
  • Integrated doherty type amplifier arrangement with high power efficiency

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Embodiment Construction

[0035] Preferred embodiments will now be described in connection with MMIC (Monolithic Microwave Integrated Circuit) technology, which can be used in transceiver design for wireless systems or any other radio frequency (RF) system. Combined with increased performance, the application of MMIC technology has enabled the miniaturization of microwave and millimeter wave systems.

[0036] In mobile RF transceivers of emerging wireless systems such as WCDMA, CDMA2000 or Wireless Local Area Network (WLAN) systems according to IEEE802.11(a) / (g) standards, power amplifiers are used at the transmitter level, where the The modulated RF signal is amplified before being provided to an antenna for wireless transmission. These power amplifiers are the largest power consuming part of these RF transceivers. Using a Doherty type amplifier structure, a high efficiency power amplifier can be provided.

[0037] In the power amplifier structure according to the preferred embodiment, a Doherty typ...

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Abstract

The present invention relates to an integrated Doherty type amplifier arrangement and an amplifying method for such an arrangement, wherein a lumped element hybrid power divider (12) is provided for splitting input signals of main and peak amplifier stages (20, 30, 40) at predetermined phase shifts and non-equal division rates and at least one wideband lumped element artificial line (Zl, Z2) combined with wideband compensation circuit for receiving said first amplified signal and for applying said predetermined phase shift to said first amplified signal and its higher harmonics. Thereby, the low gain of the peak amplifier is compensated by providing the non-equal power splitting at the input. Moreover, the use of the lumped element hybrid power divider leads to an improved isolation between the input ports of the main and peak amplifiers decreasing final distortions of the output signal.

Description

technical field [0001] The present invention relates to an integrated Doherty amplifier structure and a method for amplifying an input signal of such a Doherty amplifier structure. Background technique [0002] In recent years, there has been a strong need to improve the efficiency of power amplifiers used for wireless communications. The use of the Doherty technique allows the efficiency of the power amplifier to be maintained over a wide range of variations in input power. The Doherty amplifier was first proposed by W.H.Doherty in 1936, and the title of W.H.Doherty in Proceedings of the Institute of Radio Engineers, Vol.24, No.9 in September 1936 was "A New High Efficiency Power Amplifier For Modulated Waves" technical paper is discussed. Originally intended for low to medium frequency AM broadcast transmitters, the proposed scheme can be modified and updated to increase the efficiency of high frequency power amplifiers. [0003] In conventional amplifiers there is a di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F1/56H03F3/195
CPCH03F2200/192H03F2200/225H03F2200/198H03F3/195H03F1/565H03F1/0288H01L2224/48091H01L2224/4813H01L2924/00014
Inventor 伊戈尔·布莱德诺夫
Owner NXP BV
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