Method for generating stable square wave in which rising edge and falling edge can be independently adjusted
A generation method, independent adjustment technology, applied in pulse processing, electrical components, pulse shaping, etc., can solve the problems of square wave jitter, the solution cannot be realized, etc., and achieve the effect of high square wave accuracy
Active Publication Date: 2018-11-06
成都玖锦科技有限公司
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Problems solved by technology
With this scheme, when the set square wave period and pulse width are integer multiples of the sampling period, the generated square wave is stable, but if it is not an integer multiple, some schemes cannot be realized, while others can be realized. But it will cause jitter in the square wave
There are also some analog comparators to generate square waves, which are difficult to independently and accurately adjust the rising and falling edges of the square wave
Method used
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[0009] Combine below Figure 1 to Figure 3 , the present invention is described in further detail.
[0010] refer to Figure 1-Figure 3 , a method for generating a stable square wave whose upper and lower edges can be independently adjusted comprises the following steps: (A) according to the frequency control word FCW, the direct digital frequency synthesizer is controlled to generate two exactly the same sine wave signals, that is, two sine wave signals The frequency, amplitude and phase of the wave signal are exactly the same. Described frequency control word FCW=(f / f s )·2 N , the resulting sine wave expression is as follows:
[0011]
[0012] The amplitude of the sine wave generated by the direct digital frequency synthesizer has been normalized. In the actual FPGA fixed-point implementation, the amplitude is 2 to the Nth power, so all normalized amplitudes need to be multiplied by 2 Nth power and round up. (B) Calculate the upper and lower amplitude thresholds TH...
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The invention particularly relates to a method for generating a stable square wave in which a rising edge and a falling edge can be independently adjusted. The method comprises the following steps: (A) generating two completely the same sinusoidal signals; (B) performing peak clipping processing on one sinusoidal signal according to upper and lower amplitude thresholds THRr1 and THRr2 of the rising edge; and performing peak clipping processing on the other sinusoidal signal according to the upper and lower amplitude thresholds THRf1 and THRf2 of the falling edge; (C) moving the above two quasi-square waves up and down on amplitude coordinates, so that the centers of the quasi-square waves are zero;(D) then multiplying a corresponding gain to normalize the amplitude thereof; and (E) gatingthe square waves of the rising edge and the falling edge through a switch to obtain the square wave in which the rising edge and the falling edge can be independently adjusted. By processing the two identical sinusoidal signals, the independent and accurate adjustment of the rising edge and the falling edge of the output square wave is realized, and meanwhile, the square wave generation accuracy is very high by adoption of the method, and it is very convenient.
Description
technical field [0001] The invention relates to the technical field of electronic testing and measurement, in particular to a method for generating a stable square wave whose upper and lower edges can be independently adjusted. Background technique [0002] In the prior art, solutions for realizing a square wave in a digital manner are basically generated by means of a counter. With this scheme, when the set square wave period and pulse width are integer multiples of the sampling period, the generated square wave is stable, but if it is not an integer multiple, some schemes cannot be realized, while others can be realized. But it will cause jitter in the square wave. There are also some analog comparators to generate square waves, which are difficult to independently and accurately adjust the rising and falling edges of the square wave. Contents of the invention [0003] The purpose of the present invention is to provide a method for generating a stable square wave whose...
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IPC IPC(8): H03K5/12H03K5/08H03K5/02
CPCH03K5/02H03K5/08H03K5/12
Inventor 庞豪王江刘刚
Owner 成都玖锦科技有限公司