Method and device for detecting standing-wave ratio of radio frequency front-end product
A radio frequency front-end, standing wave ratio technology, applied in the field of communication radio frequency, can solve the problem of source mismatch error, frequency response error, affecting the accuracy of traditional standing wave ratio, etc., and achieve the effect of reducing detection error
Active Publication Date: 2013-05-08
成都芯通软件有限公司
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However, in the process of standing wave detection, there is a directional error D in the directional coupler due to the forward and reverse power of the coupler; when the standing wave ratio is detected, the equivalent source standing wave ratio from the load to the source direction will not be It is completely equal to 1, so that part of the signal reflected by the load under test will be reflected back and forth between the load under test and the source, causing an error in the detection of the standing wave ratio, that is, the source mismatch error M related to reflection S ; The frequency response error caused by the frequency response characteristics of the internal components of the RF front-end product, that is, the frequency response error T of the reflection path caused by the reflection tracking inside the RF front-end product and the detection circuit R
Due to the existence of the above three errors, it is bound to affect the accuracy of traditional VSWR detection
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[0027] Such as figure 1 As shown, using the present invention to detect standing wave ratio includes three steps. First, connect and detect related devices of radio frequency front-end products and input signals to radio frequency front-end products, that is, connect radio frequency products with signal sources and amplitude-phase receivers, and control signal The source inputs signals to the RF front-end products. Second, open-circuit calibration and calculation of the return loss detection value S 11M1 , short circuit calibration and calculation of return loss detection value S 11M2 , load calibration and calculate return loss detection value S 11M3 , and calculate the directivity error D, source mismatch error Ms, frequency response error T R , that is, the antenna port of the RF front-end product is connected to the open circuit, short circuit, and matching load in turn, that is, the antenna port of the RF front-end product passes through the three calibration modes ...
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The invention discloses a method for detecting a standing-wave ratio of a radio frequency front-end product, the device mainly connects an antenna port of the radio frequency front-end product with an opener, a short circuiter and a matching load to calculate a direction error D, a source mismatching error Ms and a frequency response error TR when the standing wave detected, and then connects theantenna port with a mismatching load to calculate the standing-wave ratio. The invention further discloses a device related to the method for detecting the standing-wave ratio of the radio frequency front-end product. Through the application of the invention, the standing-wave ratio is detected so that the direction error D, the source mismatching error Ms and the frequency response error TR can be avoided, therefore, the detection error of the standing-wave ratio can be reduced.
Description
technical field [0001] The invention relates to the field of communication radio frequency, in particular to a method and a device for detecting the standing wave ratio of a radio frequency front-end product. Background technique [0002] In the current radio frequency front-end products of wireless communication, the power amplifier outputs a high-power radio frequency signal and is connected to the antenna for transmission. In order to detect the mismatch of the antenna in time and protect the power amplifier, standing wave detection is generally performed at the antenna port. However, in the process of standing wave detection, there is a directional error D in the directional coupler due to the forward and reverse power of the coupler; when the standing wave ratio is detected, the equivalent source standing wave ratio from the load to the source direction will not be It is completely equal to 1, so that part of the signal reflected by the load under test will be reflected...
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IPC IPC(8): G01R27/06
Inventor 汪洪川
Owner 成都芯通软件有限公司