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Signal sampling test method

A technology of signal sampling and testing methods, applied in the direction of frequency measurement devices, etc., can solve problems such as exceeding the sampling range, and achieve the effect of expanding the sampling range

Active Publication Date: 2012-10-24
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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Problems solved by technology

[0009] Therefore, when sampling a very high frequency sinusoidal signal (eg, over 40M), the very high frequency sinusoidal signal may exceed the range of sampling that can be achieved by prior art testing machines

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Embodiment Construction

[0024] In order to make the content of the present invention clearer and easier to understand, the content of the present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0025] figure 2 A schematic diagram of the principle of the signal sampling testing method according to the first embodiment of the present invention is schematically shown.

[0026] The signal sampling test method according to the first embodiment of the present invention includes:

[0027] The first step: detecting the starting point T0 of the sinusoidal signal as the signal Fout to be sampled, so that the testing machine and the sinusoidal signal can be synchronized in timing.

[0028] Second step: using the testing machine to randomly generate a plurality of periodic pulse sampling signals (square wave signals), wherein each periodic pulse sampling signal in the plurality of periodic pulse sampling signals is generated separately, and The...

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Abstract

The invention provides a signal sampling test method which includes: step 1 testing the starting point of sinusoidal signals serving as signals to be sampled so as to lead a tester and the sinusoidal signals to perform timing synchronization; step 2 using the tester to randomly generate a plurality of periodic pulse sampling signals and using the plurality of periodic pulse sampling signals to take samples from the signals to be sampled so as to obtain discrete sampling values, wherein each of the plurality of periodic pulse sampling signals is independently generated; and step 3 combining the discrete sampling values obtained by using the plurality of periodic pulse sampling signals to take samples from the signals to be sampled to obtain the final discrete sampling value of the signals to be sampled. Therefore, the signal sampling test method can enlarge the sampling range capable of being achieved by the tester.

Description

technical field [0001] The invention relates to the field of signal testing, and more specifically, the invention relates to a signal sampling testing method. Background technique [0002] Signal sampling is also called signal sampling, which is the discretization of the signal in time, that is, the instantaneous value is taken point by point on the analog signal x(t) according to a certain time interval △t. It is realized by multiplying the sampling pulse and the analog signal. [0003] According to the sampling theorem, during the conversion process of analog / digital signals, when the sampling frequency is greater than twice the highest frequency in the signal to be sampled (signal to be tested), the digital signal after sampling completely retains the information in the original signal. Moreover, a sampling frequency that is 2.56 times to 4 times the frequency of the signal to be sampled can obtain a better sampling effect. [0004] That is to say, in order to test the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
Inventor 王磊
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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