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An adaptive linearization technique for communication building block

A technology of linearization and signal processing modules, applied in the direction of improving amplifiers to reduce nonlinear distortion, components of amplification devices, improving amplifiers to reduce noise effects, etc., can solve problems such as increasing size and power requirements, and increasing costs

Inactive Publication Date: 2005-01-05
GCT SEMICONDUCTOR INC
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Problems solved by technology

[0006] Current methods of linearizing signal processing blocks, especially the linearization of amplifiers, have many disadvantages
The current method is not a general method that can be applied to many linearization techniques or nonlinear systems
Additionally, these approaches result in increased cost, including increased size and power requirements

Method used

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  • An adaptive linearization technique for communication building block
  • An adaptive linearization technique for communication building block
  • An adaptive linearization technique for communication building block

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Embodiment Construction

[0024] image 3 A preferred embodiment of a linearization device for a signal processing module according to the invention is illustrated. like image 3 As shown, the first preferred embodiment of the linearization device for nonlinear cancellation is general and can be used in any nonlinear system including power amplifier applications. A first preferred embodiment of the linearization device according to the present invention can improve the linearity of a signal processing communication building block or system, preferably with low or minimal overhead in terms of at least one of volume and power requirements.

[0025] like image 3 As shown, the first preferred embodiment of the linearization device has a signal processing module 300 or system, which includes a main signal processing module H 1 and auxiliary compensation build block H 2 . For the signal processing module 300, X is an input function, and Y is a result output function. Main signal module H 1 and auxili...

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Abstract

The present invention is directed to a linearization apparatus and method. Preferred embodiments according to the present invention can combine an auxiliary non-linear block (300) to a functional block of a system to increase linearity of an output signal (520) of the system such as a communication system. System overhead due to the non-linear auxiliary block can be small because of circuit structure, cost and low consumption. Further, the non-linear auxiliary block can be designed so that no feedback path is required. Further preferred embodiments can use a feedback path without loss of stability by using a cancellation apparatus or process based on an averaging detection of the output signal. For example, a feedback loop can detect power leakage in a sideband caused by non-linearities of the communication system.

Description

Background technique [0001] figure 1 The basic concept of operation of the signal processing module 10 within the communication system is illustrated. The signal processing module 10 converts the input signal through signal amplification, filtering and frequency conversion to generate the desired output signal. Therefore, in actual implementation, the signal processing module 10 may include any one of the mixer 12, the amplifier 16, and the filter 14, etc., or even a combination of two or more such function building modules. The basic requirement for a functional building block is to provide a high level of signal integrity, or no collateral damage to the desired signal. The most common impairment to the desired output signal is non-linearity caused by device non-linearities. [0002] The formula for equation (1) shows the effect of this non-ideality when nonlinearity is considered: [0003] Y(t)=a1*x(t)+a2*x 2 (t)+a3*x 3 (t) Equation (1) [0004] where x(t) is the inpu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH03F1/3229H03F1/3223H03F1/32
Inventor 郑会三朴畯培李京浩
Owner GCT SEMICONDUCTOR INC
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