High-speed-digital-demodulation-based power control system and method of vector network analyzer

A technology of vector network analysis and digital detection, applied in general control systems, control/regulation systems, program control, etc., can solve problems such as low power control accuracy, wide bandwidth of analog circuits, and large noise, so as to simplify hardware design and improve Accuracy, the effect of improving the signal-to-noise ratio

Active Publication Date: 2015-04-22
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Application Information

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Problems solved by technology

[0007] Since these two schemes are completely realized by analog circuits, the bandwidth of analog circuits is relatively wide, and the noise is large, resulting in relatively low power control accuracy.

Method used

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  • High-speed-digital-demodulation-based power control system and method of vector network analyzer
  • High-speed-digital-demodulation-based power control system and method of vector network analyzer
  • High-speed-digital-demodulation-based power control system and method of vector network analyzer

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Embodiment 1

[0039] like image 3 As shown, the principle block diagram of the network analyzer power control system based on high-speed digital detection in this embodiment includes:

[0040] Excitation signal source 101, attenuator 102, first coupler 103, second coupler 104, mixer 105, local oscillator 106, power amplifier 107, bandpass filter 108, test channel 109, reference channel 110, CPU111 and the drive amplifier 112;

[0041] Wherein, the excitation signal source 101 is connected to the input end of the first coupler 103 through the attenuator 102;

[0042] The first output end of the first coupler 103 is connected to the input end of the second coupler 104, and the second output end thereof is connected to the first input end of the 105 mixer;

[0043] The second input end of the mixer 105 is connected to the local oscillator source 106, and its output end is connected to the bandpass filter 108 through the power amplifier 107;

[0044] The bandpass filter 108 is connected to th...

Embodiment 2

[0052] Existing vector network analyzer power control technology, whether it adopts broadband detection directly from the output port of the microwave signal source or narrowband detection at intermediate frequency, is implemented by analog circuits. Above MHz, the noise is still relatively large. Taking the AD8310 integrated logarithmic detector with high performance indicators on the market as an example, the detection sensitivity is about -70dBm and the linearity is 0.4dB. It is still difficult to meet the requirements of 0.1dB power accuracy and Wider power range.

[0053] like Figure 4 As shown, the flow chart of the power control method of the vector network analyzer based on high-speed digital detection in this embodiment includes:

[0054] Step 401, the excitation signal generated by the excitation signal source is divided into a test signal and a reference signal through the first coupler coupler;

[0055] Step 402, the test signal is output through the output port...

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Abstract

The invention provides a high-speed-digital-demodulation-based power control system and method of a vector network analyzer. On the basis of the digital demodulation and processing way, nearly all digital filters with any random bandwidths can be designed by using a digital signal processing technology, thereby improving the signal to noise ratio of demodulation and achieving an objective of enlarging a power scanning range. The digital demodulation link of the vector network analyzer has high linearity, so that the power control accuracy is improved. With the power control method for digital demodulation and processing, the designs of circuits of microwave detector and a log amplifier and the like are not needed, thereby simplifying the loop hardware design. Because demodulation is carried out on the intermediate frequency without limitation of a signal source frequency range, the same set of amplitude stabilization system can be applied to power control of the vector network analyzer in different power ranges as long as the intermediate frequency is not changed.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave energy testing, in particular to a vector network analyzer power control system and method based on high-speed digital detection. Background technique [0002] With the wide adoption of various advanced digital modulation techniques in broadband digital communication systems, in order to reduce the bit error rate of the system, designers not only need to care about the amplitude-frequency characteristics of the entire RF transceiver system, but also require the phase-frequency characteristics of the entire RF transceiver system. Take measurements. Vector network analyzer is a general microwave and millimeter wave measurement instrument. For the so-called co-frequency components with the same input and output frequencies such as amplifiers, filters, duplexers, etc. widely used in radio frequency transceiver systems, it can realize the amplitude-frequency and Accurate measurement of ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/042
CPCG05F1/66
Inventor 李卓明李树彪刘丹梁胜利曹志英段飞
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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