Low radio frequency impedance measuring equipment

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,...

AI Technical Summary

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

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