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Local oscillator IQ signal phase and amplitude calibration device

A technique of amplitude calibration and phase calibration, which is applied in electrical components, transmission systems, transmitter monitoring, etc., can solve problems such as readjustment or calibration research, and achieves avoiding image suppression problems, wide correction range, and flexible and diverse working methods Effect

Active Publication Date: 2015-01-28
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, there is little research on the readjustment or calibration of the LO signal after the LO source generates the LO signal.

Method used

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  • Local oscillator IQ signal phase and amplitude calibration device
  • Local oscillator IQ signal phase and amplitude calibration device
  • Local oscillator IQ signal phase and amplitude calibration device

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Embodiment Construction

[0020] In order to make the purpose and technical route of the present invention clearer, the implementation of the present invention will be further described in detail below through specific examples and in conjunction with the accompanying drawings.

[0021] The phase calibration circuit 102 is connected to the output end of the local oscillator source 101, and adjusts the phases of the I-channel signal and the Q-channel signal to make the phases of the output local oscillator signals quadrature-matched. The output terminal of the phase calibration circuit 102 is connected to the input terminal of the amplitude calibration circuit 103 .

[0022]The input end of the amplitude calibration circuit 103 is connected to the output end of the phase calibration circuit 102 , so that the two local oscillator signals pass through the amplitude calibration circuit 103 to obtain amplitude balance. The output terminal of the amplitude calibration circuit 103 is connected to an external ...

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Abstract

The invention discloses a local oscillator IQ signal phase and amplitude calibration device, and belongs to the technical field of radio frequency integrated circuits. Phase calibration and amplitude calibration of two paths of IQ signals by adding an amplitude calibration module and a phase calibration module to an output end port of a local oscillator. The method is suitable for various wireless transceivers, electronic interference machines, vector network analyzers in modern microwave measurement instruments, microwave sweep signal generators and other devices, is particularly suitable for phase calibration and amplitude calibration of local oscillator signals at a satellite navigation radio frequency front end, and can conveniently realize correction and calibration work in a digital-analog combined mode according to the parameters in a digital signal control simulation circuit. A calibration circuit is good in performance, wide in correction range, high in correction capacity, convenient to control, feasible, flexible and diverse in work mode and good in application prospect.

Description

technical field [0001] The invention relates to a phase-amplitude calibrating device, in particular to the field of integrated circuits suitable for calibrating the phase-amplitude of a local oscillator signal at a radio frequency front end. Background technique [0002] In recent years, direct down-conversion receivers have received more and more attention because they can be integrated on a single chip, and because quadrature frequency conversion technology can effectively avoid the problem of image rejection in wireless receivers and image rejection in wireless transmitters. With spurious problems, the orthogonal frequency conversion technology is more and more widely used in various wireless transceivers. Orthogonal frequency conversion technology uses RF signals and IQ two-way local oscillator signals that are orthogonal to each other to perform quadrature mixing to achieve frequency conversion operations. [0003] Local oscillators are widely used in modern electronic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/11H04B17/21H04B1/40
Inventor 刘言李斌刘林海田素雷张晓峰赵建欣陈明辉
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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