CN103178809A - Method and module for DDS (direct digital synthesizer) pulse edge adjusting and pulse signal generator - Google Patents
Method and module for DDS (direct digital synthesizer) pulse edge adjusting and pulse signal generator Download PDFInfo
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Abstract
The invention discloses a method and a system for DDS (direct digital synthesizer) pulse edge adjusting and a pulse signal generator. The pulse signal generator comprises input equipment, a microprocessor, a DDS module and a digital-analog converter in sequential connection, the DDS module comprises a phase accumulator, an amplitude converting module, a pulse-width adjusting module and an edge adjusting module, the edge adjusting module comprises a detection module, a rising edge adjusting module and a falling edge adjusting module, the detection module is used for detecting arrival time of a rising edge and arrival time of a falling edge of initial pulse signal data, the rising edge adjusting module is used for realizing rising edge adjusting of the initial pulse signal data according to an upper stepping value, and the falling edge adjusting module is used for realizing falling edge adjusting of the initial pulse signal data according to a lower stepping value. Compared with the prior art, by the technical scheme, quick rising and falling of pulse signal edges can be realized when frequency is low, the duty ratio is extremely low, and large-scale accurate pulse signal edge adjusting can also be realized.
Description
Technical field
The application relates to electronic instrumentation, relates in particular to a kind of DDS porch control method, module and pulse signal generator.
Background technology
DDS(Direct Digital Synthesizer, Direct Digital Synthesizer) can produce the Pulse of Arbitrary waveform, the method for the edge employing of regulating impulse at present has: a kind of is the adjusting of using the hardware circuit of discrete component composition; Another kind is for different rise and fall edges, the mode regulating impulse edge of corresponding impulse waveform data stuffing to the wave memorizer of DDS.But the scope that the porch of these two kinds of methods is regulated is all very little, all can not realize fast rise and the decline at pulse signal edge when the low frequency pulse.The size at second method edge can be subject to the impact of pulse signal frequency in addition; The edge time very large (Millisecond) during the low frequency pulse, can not set quick edge is the time very little (nanosecond) at pulse signal edge; Be subject to the restriction of waveform length, the duty ratio of low frequency pulse can not be set very little (general minimum can only be transferred to 0.1%); If want to obtain different impulse waveforms, when namely changing the frequency, edge of pulse and pulsewidth, again upgrade Wave data, particularly need to change for a long time the parameters of pulse when the length of Wave data is very large.
Summary of the invention
The technical problem underlying that the application will solve is, provide a kind of fast rise that can realize the pulse signal edge when low frequency and decline and duty ratio minimum, and DDS porch control method, module and the pulse signal generator at regulating impulse signal edge with a wide range of precise.
The application provides a kind of DDS porch control method on the one hand, comprises the following steps:
Generate the inceptive impulse signal data according to the pulse signal parameter of user's input;
Detect the arrival moment of rising edge and the trailing edge of inceptive impulse signal data;
According to the rising edge that detects and trailing edge, the inceptive impulse signal data is carried out the edge adjusting, comprise: from rising edge arrives constantly, clock cycle of every mistake, the amplitude of sampled point is increased progressively according to the rising step value, until the amplitude of sampled point is incremented to the maximum amplitude of pulse signal; From trailing edge arrives constantly, clock cycle of every mistake, the amplitude of sampled point is successively decreased according to the decline step value, until the amplitude of sampled point is decremented to the minimum amplitude of pulse signal;
Pulse data signal after regulating through the edge is carried out digital-to-analogue conversion, the pulse signal after output edge adjusting.
Further, rising step value and decline step value obtain or set in advance according to rising time and the trailing edge Time Calculation of the pulse signal of user input respectively.
Further, the computing formula of rising step value and decline step value is respectively:
Wherein, △ rise is the rising step value, and △ fall is the decline step value, T
rThe rising time of the pulse signal of expression user input, T
fThe trailing edge time of the pulse signal of expression user input, A is inceptive impulse signal maximum amplitude, F
sBe sample frequency.
Further, the pulse signal parameter of user's input comprises frequency, pulsewidth, rising time and the trailing edge time of pulse signal.
The another aspect of the application provides a kind of DDS module, comprising:
Phase accumulator is used for frequency control word according to user's input and carries out phase-accumulatedly at each work clock in the cycle, produces the corresponding phase value of inceptive impulse signal data; Described frequency control word is obtained by the frequency inverted of inceptive impulse signal;
The amplitude modular converter is for phase value being converted to the amplitude of inceptive impulse signal data;
The pulse-width regulated module is used for the pulsewidth according to the pulse-width regulated inceptive impulse signal data of user's input;
The edge adjustment module is used for the edge of inceptive impulse signal data is regulated, and the pulse data signal after output edge adjusting, and the edge adjustment module comprises:
Detection module, for detection of the arrival of the rising edge of inceptive impulse signal data constantly and the arrival of the trailing edge moment;
The rising edge adjustment module is used for realizing according to upper step value the rising edge adjusting of inceptive impulse signal data;
The trailing edge adjustment module is used for realizing according to lower step value the trailing edge adjusting of inceptive impulse signal data.
Further, the rising edge adjustment module clock cycle of every mistake, increases progressively the amplitude of sampled point, until the amplitude of sampled point is incremented to the maximum amplitude of pulse signal from rising edge arrives constantly according to the rising step value; The trailing edge adjustment module clock cycle of every mistake, is successively decreased the amplitude of sampled point, until the amplitude of sampled point is decremented to the minimum amplitude of pulse signal from trailing edge arrives constantly according to the decline step value.
Further, rising step value and decline step value obtain or set in advance according to rising time and the trailing edge Time Calculation of the pulse signal of user input respectively.
Further, the computing formula of rising step value and decline step value is respectively:
Wherein, △ rise is the rising step value, and △ fall is the decline step value, T
rThe rising time of the pulse signal of expression user input, T
fThe trailing edge time of the pulse signal of expression user input, A is the maximum amplitude of inceptive impulse signal, F
sBe sample frequency.
The another aspect of the application provides a kind of pulse signal generator, comprising:
Comprise the input equipment, microprocessor, DDS module and the digital to analog converter that connect successively;
Input equipment is used for providing input interface, receives the pulse signal parameter of user's input;
Microprocessor is used for obtaining frequency control word, pulsewidth count value, rising step value and the step value and export to the DDS module of descending;
The DDS module is used for according to pulse signal parameter generating inceptive impulse signal data, and the arrival moment of the rising edge of detection inceptive impulse signal data and the arrival of trailing edge are constantly; According to the rising edge that detects and trailing edge, the inceptive impulse signal data is carried out the edge adjusting, comprise: from rising edge arrives constantly, clock cycle of every mistake, the amplitude of sampled point is increased progressively rear output according to the rising step value, until the amplitude of sampled point is incremented to the maximum amplitude of pulse signal; From trailing edge arrives constantly, clock cycle of every mistake, with the amplitude of sampled point according to the rear output of successively decreasing of decline step value, until the amplitude of sampled point is decremented to the minimum amplitude of pulse signal;
Digital to analog converter is used for the pulse data signal after regulating through the edge of reception DDS module output, and the pulse data signal after regulating through the edge is carried out digital-to-analogue conversion, the pulse signal after output edge adjusting.
Further, the pulse signal parameter of user's input comprises frequency, pulsewidth, rising time and the trailing edge time of pulse signal, microprocessor becomes frequency control word with the frequency inverted of pulse signal, the pulse width conversion of pulse signal is become the pulsewidth count value, the DDS module produces the inceptive impulse signal data according to frequency control word and pulsewidth count value, and microprocessor calculates rising step value and decline step value according to maximum amplitude and the sample frequency of rising time, trailing edge time, pulse signal.
Effective effect of the application is: DDS porch control method, module and pulse signal generator that the application provides, make the fast rise that realizes the pulse signal edge when the low frequency and decline and duty ratio minimum by the edge adjustment module, and regulating impulse signal edge with a wide range of precise.
Description of drawings
Fig. 1 is a kind of pulse signal generator structured flowchart of the embodiment of the present application;
Fig. 2 is the flow chart of a kind of DDS porch control method of the embodiment of the present application;
Fig. 3 is a kind of inceptive impulse signal of the embodiment of the present application and the pulse signal schematic diagram of output after the edge adjustment module is regulated;
Fig. 4 is the application's pulse signal edge adjusting schematic diagram.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
As shown in Figure 1, a kind of pulse signal generator that the application provides comprises the input equipment 1, microprocessor 2, DDS module 3 and the D/A converter module 4 that connect successively.Wherein, DDS module 3 comprises phase accumulator 31, amplitude modular converter 32, pulse-width regulated module 33 and edge adjustment module 34.Edge adjustment module 34 comprises again rising edge adjustment module 341, trailing edge adjustment module 342 and detection module 343.
Input equipment 1 is used for providing input interface, receives the pulse signal parameter of user's input; In a kind of specific embodiment, the pulse signal parameter of user's input comprises frequency, pulsewidth, rising time and the trailing edge time of pulse signal.Microprocessor 2 is used for obtaining frequency control word, pulsewidth count value, rising step value and the step value and export to DDS module 3 of descending, in the present embodiment, rising step value and decline step value obtain according to rising time and the trailing edge Time Calculation of the pulse signal of user input respectively, in other embodiment, rising step value and decline step value also can set in advance, and the computing formula of rising step value and decline step value is respectively:
Wherein, △ rise is the rising step value, and △ fall is the decline step value, T
rThe rising time of the pulse signal of expression user input, T
fThe trailing edge time of the pulse signal of expression user input, A is inceptive impulse signal maximum amplitude, F
sSample frequency for digital to analog converter (DAC).In the present embodiment, △ rise, △ fall and A adopt digital quantity to represent.
The phase accumulator 31 of DDS module 3 is used for carrying out in the cycle at each work clock according to frequency control word phase-accumulated, produces the corresponding phase value of inceptive impulse signal data; In the present embodiment, microprocessor 2 becomes the frequency inverted of pulse signal frequency control word and flows to phase accumulator 31.In other embodiment, frequency control word also can be pre-stored within the FREQUENCY CONTROL register, exports to phase accumulator 31 by the FREQUENCY CONTROL register in use.Amplitude modular converter 32 is used for phase value is converted to the amplitude of inceptive impulse signal data.Pulse-width regulated module 33 is used for the pulsewidth according to the pulse-width regulated inceptive impulse signal data of user's input.Edge adjustment module 34 is used for the edge of inceptive impulse signal data is regulated, and the pulse data signal after output edge adjusting.Detection module 343 in edge adjustment module 34 is for detection of the arrival moment of the rising edge of inceptive impulse signal data and the arrival moment of trailing edge.Rising edge adjustment module 341 is used for realizing according to the rising step value rising edge adjusting of inceptive impulse signal data, the mode that realizes is: rising edge adjustment module 341 is from rising edge arrives constantly, in clock cycle of every mistake, the amplitude of sampled point is increased progressively according to the rising step value, until the amplitude of sampled point is incremented to the maximum amplitude of pulse signal.Maximum amplitude refers to the high level amplitude of the pulse signal that needs produce.Trailing edge adjustment module 342 is used for realizing according to lower step value the trailing edge adjusting of inceptive impulse signal data, the mode that realizes is, trailing edge adjustment module 342 is from trailing edge arrives constantly, in clock cycle of every mistake, the amplitude of sampled point is successively decreased according to the decline step value, until the amplitude of sampled point is decremented to the minimum amplitude of pulse signal.Minimum amplitude refers to the low level amplitude of the pulse signal that needs produce.Digital to analog converter 4 is used for the pulse data signal after regulating through the edge of reception DDS module 3 outputs, and the pulse data signal after regulating through the edge is carried out digital-to-analogue conversion, the pulse signal after output edge adjusting.Bit wide that it should be noted that pulse data signal is often greater than the data bit width of digital to analog converter, the high significance bit of pulse data signal is connected to during specific implementation so the data input port of digital to analog converter.
Based on above-mentioned pulse signal generator, as shown in Figure 2, a kind of DDS porch control method that the application provides comprises the following steps:
Step S100 is according to the pulse signal parameter generation inceptive impulse signal data of user's input.
The user can pass through input equipment input pulse signal parameter, enter in the DDS module by microprocessor, these parameters comprise frequency, pulsewidth, rising time and the trailing edge time of pulse signal, microprocessor 2 calculates respectively rising step value △ rise and decline step value △ fall according to above-mentioned formula (1) and (2), and exports to the edge adjustment module of DDS module.Phase accumulator carries out phase-accumulated according to frequency control word at each work clock in the cycle, produce the corresponding phase value of inceptive impulse signal data, the amplitude modular converter is converted to this phase value the amplitude of inceptive impulse signal data, and the pulse-width regulated module is wanted the pulse-width regulated of inceptive impulse signal data the pulsewidth that obtains for the user according to the pulsewidth of user input.Waveform Figure 101 corresponding to a kind of inceptive impulse signal data of the embodiment of the present application as shown in Fig. 3 (A) expression.
The amplitude that step S101, detection module detect sampled point is minimum amplitude or maximum amplitude, if minimum amplitude, if execution in step S102 is maximum amplitude, execution in step S103.
Step S102, the rising edge that detects pulse data signal arrives constantly, and when the rising edge arrival not detected during the moment, the amplitude of each sampled point is made as minimum amplitude, and the data of sampled point are outputed to digital to analog converter.When the rising edge arrival being detected during the moment, from the rising edge arrival moment (a point as shown in Figure 4), the rising edge of inceptive impulse signal data is regulated.
The method that the detection method constantly that arrives rising edge can adopt the amplitude with the amplitude of current sampling point and last sampled point to compare, if the difference of the amplitude of the amplitude of current sampling point and last sampled point greater than default first threshold, thinks that rising edge arrives.Rising edge arrival detection method constantly also can adopt other detection method of the prior art.
in a kind of specific embodiment, in the rising edge regulating step, according to the clock of setting, clock cycle of every mistake, the rising edge adjustment module of edge adjustment module increases progressively the amplitude of sampled point according to rising step value △ rise, until the amplitude of sampled point is incremented to the maximum amplitude of pulse signal, be about to the amplitude of sampled point from minimum amplitude, the amplitude of next sampled point is that minimum amplitude adds rising step value △ rise, the amplitude of each sampled point afterwards is to increase rising step value △ rise on the basis of last sampled point amplitude, and the amplitude after increasing progressively replaces with the amplitude of current sampling point, and the data of the sampled point after replacing output to digital to analog converter.Rising time for the pulse signal of satisfying the demand, amplitude after increasing progressively after each amplitude increases progressively and the maximum of required pulse compare, if the amplitude of a certain sampled point (c point as shown in Figure 4) surpasses the maximum amplitude of pulse signal, the amplitude of this sampled point is replaced with the maximum amplitude of pulse signal, and stop the rising edge adjusting.
In a kind of specific embodiment, in the rising edge regulating step, according to the clock frequency of setting, the inceptive impulse signal data is sampled, but to each sampled point, increase rising step value △ rise on the basis of last sampled point amplitude, and the amplitude after increasing progressively replaces with the amplitude of current sampling point, and the data of the sampled point after replacing output to digital to analog converter.And the maximum of the amplitude after increasing progressively and required pulse compares, if the amplitude of a certain sampled point surpasses the maximum amplitude of pulse signal, the amplitude of this sampled point replaced with the maximum amplitude of pulse signal, and stops rising edge and regulate.
Stop rising edge and regulate rear steering step S101.
Step S103, the trailing edge that detects pulse data signal arrives constantly, and when the trailing edge arrival not detected during the moment, the amplitude of each sampled point is made as maximum amplitude, and the data of sampled point are outputed to digital to analog converter.When the trailing edge arrival being detected during the moment, from the trailing edge arrival moment (b point as shown in Figure 4), the rising edge of inceptive impulse signal data is regulated.
The method that the detection method constantly that arrives trailing edge can adopt the amplitude with the amplitude of current sampling point and a rear sampled point to compare, if the difference of the amplitude of the amplitude of current sampling point and a rear sampled point greater than default Second Threshold, thinks that trailing edge arrives.Trailing edge arrival detection method constantly also can adopt other detection method of the prior art.
in a kind of specific embodiment, in the trailing edge regulating step, according to the clock of setting, clock cycle of every mistake, the trailing edge adjustment module of edge adjustment module is successively decreased the amplitude of sampled point according to decline step value △ fall, until the amplitude of sampled point is decremented to the minimum amplitude of pulse signal, be about to the amplitude of sampled point from maximum amplitude, the amplitude of next sampled point is that maximum amplitude deducts decline step value △ fall, the amplitude of each sampled point afterwards is to reduce decline step value △ fall on the basis of last sampled point amplitude, and the amplitude after successively decreasing replaces with the amplitude of current sampling point, and the data of the sampled point after replacing output to digital to analog converter.Be the trailing edge time of the pulse signal of satisfying the demand, amplitude after successively decreasing after each amplitude is successively decreased and the minimum value of required pulse compare, if the minimum amplitude of extra pulse signal at the bottom of the amplitude of a certain sampled point (d point as shown in Figure 4), the amplitude of this sampled point is replaced with the minimum amplitude of pulse signal, and stop the trailing edge adjusting.
In a kind of specific embodiment, in the trailing edge regulating step, according to the clock frequency of setting, the inceptive impulse signal data is sampled, but to each sampled point, reduce decline step value △ fall on the basis of last sampled point amplitude, and the amplitude after successively decreasing replaces with the amplitude of current sampling point, and the data of the sampled point after replacing output to digital to analog converter.And the minimum value of the amplitude after successively decreasing and required pulse compares, if the minimum amplitude of the low extra pulse signal of the amplitude of a certain sampled point replaces with the amplitude of this sampled point the minimum amplitude of pulse signal, and stops trailing edge and regulates.
Stop trailing edge and regulate rear steering step S101.
Step S104 carries out digital-to-analogue conversion to the pulse data signal after regulating through the edge, the pulse signal after output edge adjusting.
The inceptive impulse signal data through the adjusting of edge adjustment module after again through being exportable pulse signal be used to wanting to obtain after digital to analog converter conversion, be corresponding oscillogram 201 after the inceptive impulse signal data of the embodiment of the present application is regulated through the edge adjustment module as shown in Fig. 3 (B).
To obtain following two formula (3) and (4) after above-mentioned formula (1) and (2) distortion,
Can find out from top two formula (3) and (4), rising step value △ rise and decline step value △ fall are less, the rising time T of porch
rWith the trailing edge time T
fJust larger, rising step value △ rise and decline step value △ fall are larger, the rising time T of the porch that obtains
rWith the trailing edge time T
fJust less.Therefore at sample frequency F
sIn the constant situation of maximum amplitude A, as long as change rising step value △ rise and decline step value △ fall, just can change the edge slope of pulse signal, thereby realize the edge adjusting of pulse signal.
Require the edge to be at least 2 sampling periods in practical application, as △ rise be namely
The time, min(T
r) be
Make that △ rise is 1, obtain max(T
f) be
In like manner, as △ fall be
The time, min(T
r) be
Make that △ fall is 1, obtain max(T
f) be
As seen when A digital quantity very large (30 powers such as 2), it is very large that adjustable range is regulated at the edge of pulse signal, can be adjusted to second (s) level from nanosecond (ns) level.
The output frequency of DDS pulse is
Wherein FTW is frequency control word, and N is the bit wide of DDS phase accumulator, F
sIt is sample frequency.Even still can keep the rise and fall edge of (nanosecond) fast when low frequency, during low frequency, pulsewidth is very little, and rise and fall are along very fast, and pulsewidth can be very little, therefore can accomplish minimum duty ratio.
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace.
Claims (10)
1. a DDS porch control method, is characterized in that, comprises the following steps:
Generate the inceptive impulse signal data according to the pulse signal parameter of user's input;
Detect the arrival moment of rising edge and the trailing edge of described inceptive impulse signal data;
According to the rising edge that detects and trailing edge, described inceptive impulse signal data is carried out the edge adjusting, comprise: from rising edge arrives constantly, clock cycle of every mistake, the amplitude of sampled point is increased progressively according to the rising step value, until the amplitude of sampled point is incremented to the maximum amplitude of pulse signal; From trailing edge arrives constantly, clock cycle of every mistake, the amplitude of sampled point is successively decreased according to the decline step value, until the amplitude of sampled point is decremented to the minimum amplitude of pulse signal;
Pulse data signal after regulating through the edge is carried out digital-to-analogue conversion, the pulse signal after output edge adjusting.
2. the method for claim 1, is characterized in that, described rising step value and decline step value obtain or set in advance according to rising time and the trailing edge Time Calculation of the pulse signal of user input respectively.
3. method as claimed in claim 2, is characterized in that, the computing formula of described rising step value and decline step value is respectively:
Wherein, △ rise is the rising step value, and △ fall is the decline step value, T
rThe rising time of the pulse signal of expression user input, T
fThe trailing edge time of the pulse signal of expression user input, A is the maximum amplitude of inceptive impulse signal, F
sBe sample frequency.
4. the method for claim 1, is characterized in that, the pulse signal parameter of described user's input comprises frequency, pulsewidth, rising time and the trailing edge time of inceptive impulse signal.
5. DDS module comprises:
Phase accumulator is used for frequency control word according to user's input and carries out phase-accumulatedly at each work clock in the cycle, produces the corresponding phase value of inceptive impulse signal data; Described frequency control word is obtained by the frequency inverted of inceptive impulse signal;
The amplitude modular converter is for described phase value being converted to the amplitude of inceptive impulse signal data;
The pulse-width regulated module is used for the pulsewidth according to the described inceptive impulse signal data of pulse-width regulated of user's input;
It is characterized in that, also comprise:
The edge adjustment module is used for the edge of described inceptive impulse signal data is regulated, and the pulse data signal after output edge adjusting;
Described edge adjustment module comprises:
Detection module, for detection of the arrival of the rising edge of described inceptive impulse signal data constantly and the arrival of the trailing edge moment;
The rising edge adjustment module is used for realizing according to upper step value the rising edge adjusting of described inceptive impulse signal data;
The trailing edge adjustment module is used for realizing according to lower step value the trailing edge adjusting of described inceptive impulse signal data.
6. DDS module as claimed in claim 5, it is characterized in that, described rising edge adjustment module from rising edge arrives constantly, clock cycle of every mistake, the amplitude of sampled point is increased progressively according to the rising step value, until the amplitude of sampled point is incremented to the maximum amplitude of pulse signal; Described trailing edge adjustment module clock cycle of every mistake, is successively decreased the amplitude of sampled point, until the amplitude of sampled point is decremented to the minimum amplitude of pulse signal from trailing edge arrives constantly according to the decline step value.
7. DDS module as claimed in claim 6, is characterized in that, described rising step value and decline step value obtain or set in advance according to rising time and the trailing edge Time Calculation of the pulse signal of user input respectively.
8. DDS module as claimed in claim 7, is characterized in that, the computing formula of described rising step value and decline step value is respectively:
Wherein, △ rise is the rising step value, and △ fall is the decline step value, T
rThe rising time of the pulse signal of expression user input, T
fThe trailing edge time of the pulse signal of expression user input, A is inceptive impulse signal maximum amplitude, F
sBe sample frequency.
9. a pulse signal generator, is characterized in that, comprises the input equipment, microprocessor, DDS module and the digital to analog converter that connect successively;
Described input equipment is used for providing input interface, receives the pulse signal parameter of user's input;
Described microprocessor is used for obtaining frequency control word, pulsewidth count value, rising step value and the step value and export to the DDS module of descending;
Described DDS module is used for according to pulse signal parameter generating inceptive impulse signal data, detects described inceptive impulse signal data rising edge arrival constantly and the arrival of the trailing edge moment; According to the rising edge that detects and trailing edge, described inceptive impulse signal data is carried out the edge adjusting, comprise: from rising edge arrives constantly, clock cycle of every mistake, the amplitude of sampled point is increased progressively rear output according to the rising step value, until the amplitude of sampled point is incremented to the maximum amplitude of pulse signal; From trailing edge arrives constantly, clock cycle of every mistake, with the amplitude of sampled point according to the rear output of successively decreasing of decline step value, until the amplitude of sampled point is decremented to the minimum amplitude of pulse signal;
Described digital to analog converter is used for the pulse data signal after regulating through the edge of reception DDS module output, and the pulse data signal after regulating through the edge is carried out digital-to-analogue conversion, the pulse signal after output edge adjusting.
10. pulse signal generator as claimed in claim 9, it is characterized in that, the pulse signal parameter of described user's input comprises the frequency of pulse signal, pulsewidth, rising time and trailing edge time, described microprocessor becomes frequency control word with the frequency inverted of pulse signal, the pulse width conversion of pulse signal is become the pulsewidth count value, described DDS module produces the inceptive impulse signal data according to frequency control word and pulsewidth count value, described microprocessor is according to rising time, the trailing edge time, the maximum amplitude of pulse signal and sample frequency are calculated rising step value and decline step value.
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