CN110348157A - The noise simulation method and system of dynamic comparer - Google Patents
The noise simulation method and system of dynamic comparer Download PDFInfo
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- CN110348157A CN110348157A CN201910648799.8A CN201910648799A CN110348157A CN 110348157 A CN110348157 A CN 110348157A CN 201910648799 A CN201910648799 A CN 201910648799A CN 110348157 A CN110348157 A CN 110348157A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/20—Design optimisation, verification or simulation
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Abstract
The invention discloses a kind of noise simulation method of dynamic comparer and systems, this method comprises: offset voltage source will be connected between the positive input terminal and negative input end of the dynamic comparer；Set the voltage value in the offset voltage source to the voltage of the positive input terminal and the voltage difference of the negative input end；Multi simulation running is carried out to the dynamic comparer, counts the number of the positive output end output 0 of the dynamic comparer to obtain the probability value of the positive output end output 0；The noise power value of the dynamic comparer is solved according to the probability value of gaussian probability distribution function and positive output end output 0.The noise simulation method and system can emulate the noise of dynamic comparer.
Description
Technical field
The present invention relates to Design of A/D Converter fields, especially with regard to a kind of noise simulation method of dynamic comparer
And system.
Background technique
In Design of A/D Converter, the noise Simulation of comparator is more applicable to static comparison device.In continuous
In the static comparison device emulation of time system, DC voltage source device is added in two input terminals of comparator, by noise and directly
Stream emulation checks input noise at noise bandwidth using the afterbody amplification output of comparator as final output observation point
The value of integrated square curve is equivalent input noise energy.However in the emulation of dynamic comparer, dynamic comparer application
In discrete time system, dynamic comparer can not be suitable in simulations due to being frequently subjected to clock signal control
The emulation mode of static comparison device.
At this stage, since dynamic comparer has many advantages, such as that speed is fast, low in energy consumption is widely used to many analog-to-digital conversions
Among the design of device, finding the emulation mode for being suitable for dynamic comparer has valuable help to the design of analog-digital converter.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of noise simulation method of dynamic comparer and systems, can be to dynamic ratio
Noise compared with device is emulated.
To achieve the above object, the present invention provides a kind of noise simulation methods of dynamic comparer.This method comprises: will
Offset voltage source is connected between the positive input terminal and negative input end of the dynamic comparer；By the voltage value in the offset voltage source
It is set as the voltage of the positive input terminal and the voltage difference of the negative input end；Multi simulation running is carried out to the dynamic comparer,
The number of the positive output end output 0 of the dynamic comparer is counted to obtain the probability value of the positive output end output 0；According to
Gaussian probability distribution function and the probability value of positive output end output 0 solve the noise energy of the dynamic comparer
Value.
In one embodiment of the present invention, according to gaussian probability distribution function and the positive output end output 0 it is general
The noise power value that rate solves the dynamic comparer includes: useCome
The noise power value is solved, wherein σ2For the noise power value, P′0′For the probability value of positive output end output 0, VOSFor
The voltage value in the offset voltage source；M is noise mean value, wherein m=0.
In one embodiment of the present invention, Multi simulation running is carried out to the dynamic comparer, counts the Dynamic comparison
The number of the positive output end output 0 of device includes: when the positive output end is defeated to the probability value for obtaining the positive output end output 0
When 0 probability value is greater than 20% out, the voltage value in the offset voltage source is increased, emulation statistics is re-started, works as institute
When stating the probability value of positive output end output 0 less than 10%, the voltage in the offset voltage source is reduced, emulation is re-started
Statistics, until the probability value of statistics is within 10%~20%.
The present invention also provides a kind of noise Simulation systems of dynamic comparer comprising: dynamic comparer, offset voltage
Source, emulation statistical module.
Offset voltage source is connected between the positive input terminal and negative input end of the dynamic comparer, and voltage value is set
For the voltage of the positive input terminal and the voltage difference of the negative input end；Emulate statistical module and the dynamic comparer phase coupling
It closes, for exporting 0 number to the positive output end that the dynamic comparer carries out Multi simulation running and counts the dynamic comparer
To obtain the probability value of the positive output end output 0；Noise power value solves module and is coupled with the emulation statistical module,
For solving making an uproar for the dynamic comparer according to the probability value of gaussian probability distribution function and positive output end output 0
Acoustic energy value.
In one embodiment of the present invention, noise power value solves module according to gaussian probability distribution function and described
It includes: use that the probability of positive output end output 0, which solves the noise power value of the dynamic comparer,Solve the noise power value, wherein σ2For the noise power value,
P′0′For the probability value of positive output end output 0, VOSFor the voltage value in the offset voltage source；M is noise mean value, wherein m
=0.
In one embodiment of the present invention, the noise Simulation system further include: voltage value adjusts module, voltage value tune
Mould preparation block is coupled with the offset voltage source and the emulation statistical module, for working as the general of positive output end output 0
When rate value is greater than 20%, the voltage value in the offset voltage source is increased, is also used to work as the general of positive output end output 0
When rate value is less than 10%, the voltage in the offset voltage source is reduced.
Compared with prior art, the noise simulation method and system of dynamic comparer according to the present invention, utilizes noise
Physical characteristic realizes the noise Simulation of dynamic comparer using gaussian probability distribution function, is suitable for discrete-time system.
Detailed description of the invention
Fig. 1 is the noise Simulation that the positive-negative input end of dynamic comparer according to an embodiment of the present invention links together
As a result；
Fig. 2 is making an uproar for the indirect offset voltage source of the positive-negative input end of dynamic comparer according to an embodiment of the present invention
Acoustic simulation result；
Fig. 3 is the noise simulation method of dynamic comparer according to an embodiment of the present invention；
Fig. 4 is the noise Simulation system of dynamic comparer according to an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
Inventor analyzes the prior art, finds the noise simulation method of existing comparator just in static state
Comparator is only applicable to continuous time system, lacks applicability for discrete-time system, but dynamic comparer is extensive
Among design applied to analog-to-digital conversion device, therefore it is highly desirable to develop noise simulation method to dynamic comparer.
Based on the above issues, inventor has carried out some researchs, inventor find noise be due to a large amount of electronics with
Caused by machine moves, each electronics has relatively independent statistical law, and total amplitude obeys gaussian probability distribution function.I.e.Wherein σ2For noise energy, noise mean value m=0.
Based on the studies above, inventor has also carried out following tests, is first connected to the positive and negative both ends of dynamic comparer
Together, as shown in Figure 1, due to noise voltage Normal Distribution, so if noise Simulation is carried out to comparator, comparator
Ideal output result is as shown in Figure 1, comparator output high level and the low level probability of output are 50%.
Then offset voltage VOS will be added between the positive and negative both ends of dynamic comparer, as shown in Fig. 2, discovery comparator is defeated
1 number will increase out, export 0 probability and will reduce.Although at this time noise be still be desired for 0 normal distribution, only
Have noise voltage below-VOS when, comparator could export 0.VOS is a known numerical value at this time, comparator output 0
Probability P′0′It can count and obtain, only one unknown number σ in the gaussian probability distribution function of normal distribution, therefore can count
Calculation obtains σ, to acquire noise energy.
Based on the studies above, the present invention provides a kind of noise simulation method of dynamic comparer and systems, can be to dynamic
The noise of state comparator is emulated, and can be adapted for discrete-time system.
As shown in figure 3, in one embodiment, the noise simulation method of dynamic comparer includes step S1~step S4.
In step sl, offset voltage source will be connected between the positive input terminal of dynamic comparer and negative input end.
In step s 2, the voltage value in offset voltage source is set to the voltage of positive input terminal and the voltage of negative input end
Difference.
In step s3, Multi simulation running is carried out to dynamic comparer, counts time of the positive output end output 0 of dynamic comparer
Number is to obtain the probability value of positive output end output 0.In simulations, simulation times should be sufficiently large to embody noise in sample
It is normal distribution in space, such as 500,1000.
In step s 4, dynamic ratio is solved according to the probability value of gaussian probability distribution function and positive output end output 0
Compared with the noise power value of device.
Specifically, dynamic comparer is solved according to the probability of gaussian probability distribution function and positive output end output 0
Noise power value includes: useSolve noise power value, wherein σ2To make an uproar
Acoustic energy value, P′0′For the probability value of positive output end output 0, VOSFor the voltage value in offset voltage source；M is noise mean value, wherein m
=0.
Obtaining σ, to SNDR (sinad ratio) and ENOB, (modulus turns in Design of A/D Converter so as to calculate it
The number of significant digit of parallel operation) influence.For example, the sinad ratio of the analog-digital converter with 12 comparatorsWherein, N is the number of comparator, and N=12 is the defeated of dynamic comparer
Enter voltage,For the power of input signal,For quantizing noise, σ2For comparator noise.ENOB (has
Imitate digit)=(SNDR-1.76)/6.02
In one embodiment, Multi simulation running is carried out to dynamic comparer, counts the positive output end output 0 of dynamic comparer
Number to obtain positive output end output 0 probability value include: when positive output end output 0 probability value be greater than 20% when, will
The voltage value in offset voltage source is increased, and emulation statistics is re-started, when the probability value of positive output end output 0 is less than 10%
When, the voltage in offset voltage source is reduced, re-start emulation statistics, until statistics probability value 10%~20% it
It is interior.It is arranged within 10%~20% by the probability value that will export 0, the accuracy of noise Simulation can be increased.
Based on same inventive concept, the present invention also provides a kind of noise Simulation systems of dynamic comparer, such as Fig. 4 institute
Show, in one embodiment, which includes: dynamic comparer 10, offset voltage source 11, emulation statistical module
12, noise power value solves module 13.
Offset voltage source 11 is connected between the positive input terminal and negative input end of dynamic comparer 10, and voltage value is set
For the voltage of positive input terminal and the voltage difference of negative input end.
Emulation statistical module 12 is coupled with dynamic comparer 10, for carrying out Multi simulation running to dynamic comparer 10 and uniting
The number of the positive output end output 0 of meter dynamic comparer 10 is to obtain the probability value of positive output end output 0.
Noise power value solve module 13 and emulation statistical module 12 be coupled, be used for according to gaussian probability distribution function with
And the probability value of positive output end output 0 solves the noise power value of dynamic comparer 10.
Specifically, noise power value solve module 13 according to gaussian probability distribution function and positive output end output 0 it is general
The noise power value that rate solves dynamic comparer 10 includes: useTo ask
Noise power value is solved, wherein σ2For noise power value, P′0′For the probability value of positive output end output 0, VOSFor offset voltage source 11
Voltage value；M is noise mean value, wherein m=0.
Preferably, noise Simulation system further includes voltage value adjustment module 14.Voltage value adjusts module 14 and offset voltage
Source 11 and emulation statistical module 12 are coupled, when the probability value for exporting 0 when positive output end is greater than 20%, by offset voltage
The voltage value in source 11 is increased, and is also used to when the probability value of positive output end output 0 is less than 10%, by offset voltage source 11
Voltage is reduced.It is arranged within 10%~20% by the probability value that will export 0, the accurate of noise Simulation can be increased
Degree.
In conclusion the present invention is as caused by the random motion of a large amount of electronics using noise, each electronics has
The characteristics of relatively independent statistical law, total amplitude obeys gaussian probability distribution function, to realize discrete time system
The noise Simulation of the dynamic comparer of system.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (6)
1. a kind of noise simulation method of dynamic comparer characterized by comprising
Offset voltage source will be connected between the positive input terminal and negative input end of the dynamic comparer；
Set the voltage value in the offset voltage source to the voltage of the positive input terminal and the voltage difference of the negative input end；
To the dynamic comparer carry out Multi simulation running, count the dynamic comparer positive output end output 0 number to
Obtain the probability value of the positive output end output 0；
Making an uproar for the dynamic comparer is solved according to the probability value of gaussian probability distribution function and positive output end output 0
Acoustic energy value.
2. the noise simulation method of dynamic comparer as described in claim 1, which is characterized in that be distributed letter according to gaussian probability
The noise power value that the probability of several and described positive output end output 0 solves the dynamic comparer includes:
UsingSolve the noise power value, wherein σ2For the noise
Energy value, P′0′For the probability value of positive output end output 0, VOSFor the voltage value in the offset voltage source；M is noise mean value,
Wherein, m=0.
3. the noise simulation method of dynamic comparer as described in claim 1, which is characterized in that the dynamic comparer into
Row Multi simulation running counts the number of the positive output end output 0 of the dynamic comparer to obtain the positive output end output 0
Probability value includes:
When the probability value of positive output end output 0 is greater than 20%, the voltage value in the offset voltage source is increased, weight
Newly carry out emulation statistics, when the positive output end output 0 probability value less than 10% when, by the voltage in the offset voltage source into
Row reduces, and re-starts emulation statistics, until the probability value of statistics is within 10%~20%.
4. a kind of noise Simulation system of dynamic comparer characterized by comprising
Dynamic comparer；
Offset voltage source is connected between the positive input terminal and negative input end of the dynamic comparer, and voltage value is arranged to
The voltage difference of the voltage of the positive input terminal and the negative input end；
Statistical module is emulated, is coupled with the dynamic comparer, for carrying out Multi simulation running to the dynamic comparer and uniting
The number of the positive output end output 0 of the dynamic comparer is counted to obtain the probability value of the positive output end output 0；
Noise power value solves module, is coupled with the emulation statistical module, be used for according to gaussian probability distribution function and
The probability value of the positive output end output 0 solves the noise power value of the dynamic comparer.
5. the noise Simulation system of dynamic comparer as described in claim 1, which is characterized in that noise power value solves module
The noise energy of the dynamic comparer is solved according to the probability of gaussian probability distribution function and positive output end output 0
Value includes:
UsingSolve the noise power value, wherein σ2For the noise
Energy value, P′0′For the probability value of positive output end output 0, VOSFor the voltage value in the offset voltage source；M is noise mean value,
Wherein, m=0.
6. the noise Simulation system of dynamic comparer as described in claim 1, which is characterized in that the noise Simulation system is also
Include:
Voltage value adjusts module, is coupled with the offset voltage source and the emulation statistical module, for when described just defeated
When the probability value of outlet output 0 is greater than 20%, the voltage value in the offset voltage source is increased, is also used to when described just defeated
When the probability value of outlet output 0 is less than 10%, the voltage in the offset voltage source is reduced.
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| CN201910648799.8A CN110348157B (en) | 2019-07-18 | 2019-07-18 | Noise simulation method and system of dynamic comparator |
| PCT/CN2020/102870 WO2021008621A1 (en) | 2019-07-18 | 2020-07-17 | Noise simulation method and system for dynamic comparator, and storage medium and computer device |
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| WO2021008621A1 (en) | 2021-01-21 |
| CN110348157B (en) | 2022-04-12 |
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