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High efficiency linear transmitter

A signal transmitter, non-linear technology, applied in the field of transmitters, can solve problems such as adverse effects of LINC transmitter 100 recombination efficiency

Inactive Publication Date: 2011-08-24
AGENCY FOR SCI TECH & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is an adverse effect on the recombination efficiency of the LINC transmitter 100

Method used

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  • High efficiency linear transmitter
  • High efficiency linear transmitter
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Embodiment Construction

[0025] Various embodiments of the present invention are directed to high efficiency linear transmitters that can be used in wireless products involving high linear radio frequency (RF) power amplification. Examples of such wireless products include 3G mobile phones, 4G mobile phones, wireless local area network (WLAN) devices, and multiple-input and multiple-output (MIMO) WLAN devices. Other examples include software-determined radio and cognitive radio. Additionally or alternatively, linear transmitters may be used in the base station.

[0026] For the sake of brevity and clarity, aspects of various embodiments of the invention are described here in the context of a linear transmitter. However, it does not exclude that various embodiments can be applied to other systems, devices, and / or processes, and the basic principles generally exist in various embodiments of the present invention, such as expected operation, function and characteristics.

[0027]As described in more de...

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Abstract

A highly efficient linear transmitter uses a control module to compare an input signal with a threshold. The transmitter includes one or more power amplifiers (230a, 230b), a component separator (210b) and a combiner (240). The power amplifiers are coupled to a first power supply voltage (Vd) and a second power supply voltage (Vd / ss). Above the threshold the input signal is applied directly to the separator and a first power supply voltage is selected for the power amplifiers. When the input signal is below the threshold the input to the separator is multiplied by a factor ss and the power amplifiers are compensated by applying a second power supply voltage (Vd / ss). Components include LINC (constant amplitude variable phase) signals.

Description

technical field [0001] The present invention generally relates to transmitters. More specifically, various aspects of the invention relate to high efficiency linear transmitters. Background technique [0002] Achieving spectral efficiency is an important issue for wireless communications because the available radio frequency (RF) spectrum is a limited natural resource. Spectrally efficient linear modulation schemes with varying signal amplitudes have been used in new generations of wireless systems, such as 3G-based systems, Wireless Local Area Network (WLAN)-based systems, and Worldwide Interoperability for Microwave Access (WiMAX)-based systems . [0003] The current demand for cost reduction has led to the development of basic base station systems to multi-carrier type base station systems. In a multi-carrier base station system, RF carriers with fluctuating envelopes are combined to form a composite source signal. This combination of multiple RF carriers increases th...

Claims

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Application Information

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IPC IPC(8): H03F3/20H03F3/24
CPCH03F3/211H03F3/24H03F1/0244H03F1/0294H03F2200/511
Inventor 时波
Owner AGENCY FOR SCI TECH & RES
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