A Calibration Method for Amplitude Sweep Estimation of Arbitrary Waveform Generator
A technique of arbitrary waveform and calibration method, applied in instruments, measuring devices, measuring electrical variables, etc., can solve problems such as omission, and achieve the effect of improving accuracy and realizing fully automatic operation.
Active Publication Date: 2019-09-24
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology
[0017] Aiming at the problem of missing "key points" when the existing arbitrary waveform generator calibrates the frequency points at equal intervals, the present invention provides an arbitrary waveform generator amplitude sweep frequency estimation calibration method, by first obtaining the extreme point of the frequency response curve The method ensures that the key points of the frequency response curve are not missed, and the accuracy of the amplitude calibration is improved.
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[0038] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:
[0039] combine image 3 and Figure 4 , a method for estimating and calibrating the amplitude sweep frequency of an arbitrary waveform generator, which cooperates with the existing method for obtaining calibration samples at equal intervals, includes the following steps:
[0040] Step 1: The output terminal of the arbitrary waveform generator is connected to the input terminal of the spectrum analyzer through the RF coaxial cable, and the rear end of the arbitrary waveform generator is connected to the corresponding interface of the spectrum analyzer through LAN, GPIB or serial port.
[0041] Step 2: The arbitrary waveform generator performs a linear frequency sweep, the spectrum analyzer maintains the maximum frequency response curve, and reads the frequency response data through LAN, GPIB or serial port to obtain the fre...
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The present invention provides a method for estimating and calibrating amplitude sweep frequency of an arbitrary waveform generator. By cooperating with the existing method of obtaining calibration sample points at equal intervals, the frequency response curve is obtained by linear sweep mode, and the frequency response curve is intensively sampled. , to obtain each extreme point, these points are the points that must be selected for the calibration frequency points, and then insert some non-extreme points in the extreme points, and the number of calibration sample frequency points obtained is the same as the number of equally spaced calibration samples, so in Compared with the original technology, the time complexity does not increase, and it is guaranteed that no "key point" of the frequency response curve is missed, which not only realizes the fully automatic operation of the amplitude calibration, but also improves the accuracy of the amplitude calibration. The invention greatly improves the accuracy of the calibration data without increasing the time complexity, and is especially suitable for an arbitrary waveform generator circuit with unsatisfactory analog channels and insufficient amplitude flatness.
Description
technical field [0001] The invention relates to the field of amplitude calibration of arbitrary waveform generators, in particular to a method for estimating and calibrating amplitude sweep frequency of arbitrary waveform generators. Background technique [0002] Arbitrary waveform generator is an editable multifunctional signal generating device, which can generate regular waveforms such as sine, square wave, pulse wave, etc., and can also generate special application waveforms such as electrocardiogram, multi-tone, Gaussian pulse, etc., which can be applied to integrated Circuit testing, complex electromagnetic environment construction, satellite navigation communication testing and other fields. [0003] Arbitrary waveform generators have high operating bandwidth performance, wide dynamic output range and high control precision requirements, which put forward extremely high requirements for the design of signal analog channels. When the hardware circuit is relatively fix...
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IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 滕友伟刘宇逄锦昊吴恒奎
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP