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Intermediate-frequency detection based vector network analyzer power control method

A vector network analysis and power control technology, applied in the field of vector network analyzer power control, can solve problems such as difficulty in guaranteeing power accuracy and inability to achieve automatic amplitude stabilization, and achieve the goal of improving power accuracy, expanding power scanning range, and improving power accuracy. Effect

Active Publication Date: 2012-11-14
CHINA ELECTRONIS TECH INSTR CO LTD
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Problems solved by technology

And for the test of some high-power devices, when an additional driving amplifier needs to be added outside the network analyzer, the power accuracy of the output of the external amplifier will be more difficult to guarantee.
In addition, this method of amplitude stabilization cannot realize automatic amplitude stabilization in the pulse state

Method used

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  • Intermediate-frequency detection based vector network analyzer power control method
  • Intermediate-frequency detection based vector network analyzer power control method
  • Intermediate-frequency detection based vector network analyzer power control method

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Embodiment Construction

[0019] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

[0020] Such as figure 2 The excitation source shown is divided into two paths through coupler 1, one path is used as a test signal and output through port 1 through coupler 2, and the other path is used as a reference signal to mix with the local oscillator source, and the output R intermediate frequency signal is further divided into two paths, one path Enter the receiver for network parameter calculation, and the other path is band-pass filtered, intermediate frequency detection, logarithmic amplification, and integrated with the control voltage, and the output of the integrator is fed back to the variable attenuator in the excitation source. In this way, the excitati...

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Abstract

The invention discloses an intermediate-frequency detection based vector network analyzer power control method. An excitation source is divided into two paths by couplers, one path serves as testing signals which are outputted through a port via the couplers, the other path serves as reference signals which are in frequency mixing with a local oscillator, outputted intermediate-frequency signals are divided into two paths, the intermediate-frequency signals in one path enter a receiver for network parameter calculation, the intermediate-frequency signals in the other path are integrated with control voltage by means of band-pass filtering, intermediate-frequency detection and logarithmic amplification, output of an integrator is fed back to a variable attenuator in the excitation source, and accordingly, a closed-loop automatic level control link is formed among the excitation source and the intermediate-frequency signals .

Description

technical field [0001] The invention relates to a power control method of a vector network analyzer based on intermediate frequency detection. Background technique [0002] The importance of vector network analyzers in the field of RF, microwave and millimeter wave testing is obvious to all. One of the typical applications is the index test of a wide variety of amplifiers. For example, when measuring the compression point of a high-precision amplifier, it is hoped that the accuracy of the source power output by the test instrument is as high as possible; The source power has a wide power sweep range; when the pulse modulation signal is excited, it is hoped that the pulse power can be accurately controlled. [0003] The power control technology of existing test instruments basically adopts the automatic level control (ALC) technology based on the internal source port for broadband detection. Since the wideband detection is directly performed from the source port, the noise p...

Claims

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Application Information

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IPC IPC(8): H04B17/00H03L5/02H04B17/14
Inventor 李卓明段飞梁胜利曹志英
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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