Method for confirming electromagnetic delay of network analyser and measuring high frequency circuit impedance

A network analyzer, high-frequency circuit technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc.

Active Publication Date: 2011-08-10
QINGDAO HISENSE MOBILE COMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0015] However, in the actual experiment process, it is found that through the compensation method of the prior art, the measured circuit impedance calculated by the network analyzer is still between the actual measured circuit impedance There is a certain phase deviation

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  • Method for confirming electromagnetic delay of network analyser and measuring high frequency circuit impedance
  • Method for confirming electromagnetic delay of network analyser and measuring high frequency circuit impedance
  • Method for confirming electromagnetic delay of network analyser and measuring high frequency circuit impedance

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Embodiment Construction

[0073] The inventors of the present invention have found that the inaccurate testing impedance method of the prior art is mainly due to the fact that the method of the prior art measures the phase deviation caused by the probe by opening or short-circuiting the input end of the probe, so that Electromagnetic delay is used to compensate the phase deviation caused by the probe; however, there may be other factors besides the probe that may cause measurement deviation. When performing electromagnetic delay compensation calibration on the probe, there are two methods, one is after the probe is calibrated , to be welded into the circuit under test, and the other is to solder the ground end of the probe to the ground of the circuit under test, and calibrate the input end in the air or ground; the first method is used for calibration, and the maximum error is "the probe's The grounding point is not consistent with the grounding point of the probe during measurement", resulting in inac...

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Abstract

The invention relates to the mobile communication field, in particular to a technology for impedance measurement on a mobile terminal high-frequency circuit through a network analyzer. A method provided by the technology is used for determining the electromagnetic delay of the network analyzer and measuring the impedance of the high-frequency circuit and comprises the steps as follows: a probe ofthe network analyzer is connected with the high-frequency circuit for measurement to obtain a first reflection coefficient after the network analyzer is calibrated; after the electrical inductance isconnected in series with the high-frequency circuit, the probe of the network analyzer is connected with the circuit that is connected in series with the electrical inductance for measurement to obtain a second reflection coefficient; and the electromagnetic delay of the network analyzer is determined according to the electrical inductance value, the first reflection coefficient and second reflection coefficient. The reflection coefficients are measured before and after the high-frequency circuit is connected in series with the electrical inductance, and both the reflection coefficients can reflect the phase excursion caused by the probe or other factors in the circuit, so that the compensating electromagnetic delay to the phase excursion is determined according to the two reflection coefficient values so as to lead the impedance measurement to be more accurate.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a technique for measuring the impedance of a high-frequency circuit of a mobile terminal through a network analyzer. Background technique [0002] Impedance matching is a technique commonly used in radio technology. In mobile terminals, impedance matching is often applied between cascaded circuits of various parts of a radio frequency (RF) system. In general, the circuits that need to be matched include the matching between the antenna and the low-noise amplifier (LNA), the matching between the power amplifier output (RFOUT) and the antenna, and the matching between the LNA / VCO output and the mixer input. The purpose of matching is to ensure that the signal or energy is effectively transmitted from the "signal source" to the "load". [0003] Parasitic elements such as inductance on wiring, capacitance between board layers, and resistance of conductors in high-frequency circu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/04G01R27/06
Inventor 王国涛
Owner QINGDAO HISENSE MOBILE COMM TECH CO LTD
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