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Circuit for restraining LO leakage

A technology of local oscillator leakage and circuit, applied in the field of communication, can solve the problems of non-strict quadrature phase, high cost and large volume of high-performance filters

Inactive Publication Date: 2008-01-16
SHANGHAI HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Among them, I / Q quadrature up-conversion is generally seldom used in broadband software radio base stations due to the existence of two-way signal amplitude imbalance, non-strictly orthogonal phase and cost, and is only used in some special occasions
[0010] In practical application, the above scheme has the following problems: high cost, large volume, affecting manufacturability and system reliability
[0011] The main reason for this situation is that the cost of high-performance filters is very high. If a multi-stage filter is used, it is also necessary to consider matching and compensating for sound velocity such as signal attenuation, which will further increase the cost; in addition, in some cases of high linearity requirements In this case, it is usually necessary to add a multi-stage filter, or even equipped with a cavity filter, which increases the volume

Method used

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] In general, the principle of the present invention is to couple the local oscillator output signal in the cancellation channel, and through delay, amplitude and phase adjustment, the amplitude of the signal output by the cancellation channel is the same as that of the mixer output signal, and the phase difference is 180 degrees , and then added to the output signal of the mixer, thereby achieving the effect of canceling the leakage of the local oscillator signal. In addition, in order to reduce the magnitude of the phase adjustment, the time delay of the cancellation channel can be adjusted as required. Moreover, when it is found that the suppression effect of the single loop on the local oscillation leakage is not up to the requirement of the index, the do...

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Abstract

The related circuit to suppress intrinsic leakage comprises: coupling the intrinsic output signal in the second branch as kill channel, delaying, regulating on amplitude and phase to let signal from kill channel with same amplitude and opposite phase to the one from mixer; then, superposing signals; besides, if failing to index requirement, adding the third branch composed by the third / fourth directional coupler and a second vector modulator for further suppression. This invention has reliable performance with small size and low cost.

Description

technical field [0001] The invention relates to the communication field, in particular to software radio technology. Background technique [0002] Software radio is an open structure that connects standardized and modular hardware functions through a general hardware platform, and then loads software to realize various types of radio communication systems. There are two basic ideas of software radio: the first is to put A / D / A (analog / digital / analog conversion) as close as possible to the antenna end; the second is to use software to complete as many radio functions as possible. Software radio has the advantages of modularization, standardization, openness, flexible implementation, software upgrade, and flexible system configuration, so it will be widely used in future wireless communication systems, such as the third generation mobile communication (The Third Generation, referred to as "3G") middle. [0003] At present, with the development of Very Large Scale Integration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H03D7/18
Inventor 彭清泉
Owner SHANGHAI HUAWEI TECH CO LTD
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