Amplitude sweep frequency estimation and calibration method for arbitrary waveform generator
A technology of arbitrary waveforms and calibration methods, which is applied in the direction of instruments, measuring devices, and measuring electrical variables, can solve problems such as omissions, achieve the effect of improving accuracy and realizing fully automatic operation
Active Publication Date: 2018-05-11
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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[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 invention provides an amplitude sweep frequency estimation and calibration method for an arbitrary waveform generator. On the basis of cooperation with the existing method for equal-interval acquisition of a calibration sample point, a frequency response curve is obtained by means of linear frequency sweeping; dense sampling is carried out on the frequency response curve to obtain all extremepoints that are required ones for calibrating frequency points; and some non-extreme points are inserted among the extreme points, wherein the number of frequency points of calibrated samples is equalto the number of equal-interval calibrated sample points. Therefore, compared with the prior art, the estimation and calibration method have the same time complexity and no key point of the frequencyresponse curve is missed, so that the full-automatic operation of the amplitude calibration is realized and the amplitude calibration precision is improved. According to the invention, the precisionof calibration data is improved substantially while the time complexity is not enhanced. The estimation and calibration method is especially suitable for an arbitrary waveform generator circuit with the unsatisfactory simulated channel and poor amplitude evenness.
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