Low radio frequency impedance measuring equipment

A technology of impedance measurement and low radio frequency, which is applied in the field of radio frequency, can solve the problems of high standing wave measurement precision, poor impedance precision and precision problems, and achieve the effect of simple structure, high measurement precision and low cost

Active Publication Date: 2010-07-21
成都芯通软件有限公司
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Problems solved by technology

Even so, the voltage standing wave ratio corresponding to the 1Ω order impedance in the 50Ω system is 50:1, so the measurement accuracy of such a high standing wave and the impedance accuracy converted from the high standing wave are very poor.
[0006] The goal of the device proposed in this patent is to solve the accuracy problem faced by using a vector network analyzer to measure low radio frequency impedance in the order of 1Ω

Method used

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Embodiment Construction

[0028] All the features disclosed in this specification, or all disclosed methods or steps in the process, except for mutually exclusive features and / or steps, can be combined in any manner.

[0029] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless specifically stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is just one example of a series of equivalent or similar features.

[0030] The present invention is a low radio frequency impedance measuring device. A first impedance transformation microstrip line, a second impedance transformation microstrip line and a coaxial transition are sequentially connected between the measured low radio frequency impedance circuit and the coaxial test port of a vector network analyzer Microstrip line (that is, the low RF impedance end of the low RF impedance microstrip circuit is connected with the low...

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Abstract

The invention discloses low radio frequency impedance measuring equipment used for assisting radio frequency power amplifier development. The measuring equipment comprises a 50ohm coaxial matched load (1), a coaxial micro-strip transition connector (2), a low radio frequency impedance circuit (3) which is to be measured and additionally provided with two impedance-changing micro strips and a micro strip OSL correction printed circuit board (4); wherein the two impedance-changing micro strips (b and c) improve impedance level of a low radio frequency impedance micro strip circuit (a) to the level which can be accurately measured by a vector network analyzer, thus eliminating big error caused by measuring low radio frequency impedance directly; and a micro strip OSL correcting element eliminates testing error induced by coaxial test port and micro strip circuit transition part, thus measuring accuracy is further improved. The invention has the advantages of simple structure, good measuring accuracy and low cost.

Description

Technical field [0001] The invention relates to radio frequency, in particular to a low radio frequency impedance measurement device. Background technique [0002] In the process of developing RF power amplifiers, in order to reduce the amount of debugging required on the actual microstrip circuit board, simulation software is often used to optimize the design of the RF power amplifier matching circuit, so that the external system impedance 50Ω is transformed by the microstrip matching circuit in the power transistor The impedance obtained by the end face is as close as possible to the target impedance derived from the power transistor model, and the theoretical expected result given by the simulation is regarded as the ultimate goal that the actual circuit is expected to achieve. However, due to the inherent errors of the power transistor model, the simulation software algorithm error, and the difference between the simulation circuit model and the actual circuit implementation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
Inventor 钟名庆
Owner 成都芯通软件有限公司
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