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Predistortion linearizer with bridge topology having an equalizer stage for each bridge arm

A linearizer and equalizer technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, amplifiers, electrical components, etc., can solve the problems of difficulty in controlling the frequency characteristics of linearization circuits, etc.

Inactive Publication Date: 2011-08-17
TESAT SPACECOM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Parasitics within the linearizing bridge make it difficult to control the frequency characteristics of the linearizing circuit
Adjustment to the desired characteristic is in principle only possible in a limited frequency range

Method used

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  • Predistortion linearizer with bridge topology having an equalizer stage for each bridge arm
  • Predistortion linearizer with bridge topology having an equalizer stage for each bridge arm
  • Predistortion linearizer with bridge topology having an equalizer stage for each bridge arm

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Experimental program
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Embodiment Construction

[0024] figure 1 A circuit diagram of a linearizing bridge according to the prior art is shown with a 90° hybrid 1 at the input, a phase shifter 2 and a 90° hybrid 9 at the circuit output. A vector superposition of linear (ie power-dependent) signals is performed here. Furthermore, a distortion generator 3 and an attenuator 6 are connected between non-linear (ie distortion-induced) signals.

[0025] Here, the signal first passes through the distortion generator 3 in the non-linear bridge arm. As the signal power increases, here the signal deviates from the small-signal characteristic in amplitude and phase at the output of the distortion generator. At this time, the amplitude is compressed at least once, such as figure 1 as shown. The necessary run-time difference between the two bridge arms can be achieved in the small-signal output control by means of the adjustable phase shifter 2 in the linear bridge arms.

[0026] In the non-linear bridge arm, the adjustable attenuato...

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Abstract

The invention relates to a predistortion linearizer for a power amplifier using a bridge topology, having the advantages that an equalizer stage (4 and, respectively, 5) is arranged in the linear and non-linear bridge arm (7 and, respectively, 8). This equalizer stage serves to compensate for the frequency response of the complex expansion of the bridge. The equalizers insert adjustable transmission functions in the linear and non-linear bridge arms, and therefore the linearizer compensates for the individual non-linear frequency response of a power amplifier, said frequency response varying within a production batch.

Description

technical field [0001] The present invention relates to a predistortion linearizer for a power amplifier using a bridge topology. Background technique [0002] Information technology workloads for aerospace equipment should be able to transmit large amounts of information while keeping the mass of the device as small as possible. Since new high-efficiency modulation methods and multicarrier methods increasingly require large bandwidths, wideband linearizers are important modules of the transmission unit which are transparent to the carrier frequency and the various modulation methods. [0003] Power amplifiers have non-linear characteristics that behave differently within a batch and depend heavily on frequency. Linearizing bridges according to the current state of the art only allow an adaptation of their non-linear compensation for a part of the operating frequencies, whereas for the remaining frequencies in the usable frequency band this linearization does not correspond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH03F1/3241H03F1/3276
Inventor A·M·希拉D·洛伊希特W·格罗斯M·尤齐H·施赖伯
Owner TESAT SPACECOM
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