CN109639278A - The timing compensation method and device of multichannel time-interleaved AD C - Google Patents
The timing compensation method and device of multichannel time-interleaved AD C Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/1205—Multiplexed conversion systems
- H03M1/123—Simultaneous, i.e. using one converter per channel but with common control or reference circuits for multiple converters
Abstract
The invention discloses the timing compensation method and devices of multichannel time-interleaved AD C a kind of, this method comprises: the periodic signal for setting duration is inputted the calibration ADC；Selected sampled point is obtained from each initial samples point of the calibration ADC；The time bias value of each selected sampled point is determined according to each initial samples point of the calibration ADC and the periodic signal；Actual samples point of at least one the described acquisition ADC in the setting duration is compensated using the time bias value of each selected sampled point.In the program, time bias can be carried out for the actual samples point of at least one acquisition ADC within the set duration, so as to avoid the mismatch of at least one acquisition ADC timing.
Description
Technical field
The present invention relates to field of communication technology, espespecially a kind of multichannel time interleaving analog-digital converter (Analog to
Digital Converter, ADC) timing compensation method and device.
Background technique
With complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor,
CMOS) the development of integrated circuit technology, digital circuit relative to analog circuit have integrated level it is high, it is anti-interference it is strong, be easily achieved
And the advantages that at low cost, therefore the commonly used digital circuitry instead analog circuit of people completes signal processing.However, real world is mould
Quasi-, such as sound, image, temperature and pressure signal, it is therefore desirable to analog- and digital- interface, i.e. ADC and digital analog converter
(Digital to Analog Converter, DAC).
In order to by real world time and amplitude on be all that continuous analog input signal is converted into digital signal, it is first
Analog input signal will first be sampled, be converted under the action of sampling pulse it is discrete on some times, i.e., with every
The sample of signal value sequence of certain period of time replaces original analog signal, but amplitude is still continuous sampled value, then
It is approximately limited multiple discrete amplitudes, this is both quantization.Signal after quantization can be carried out coding and convert
For digital signal.And sampling thheorem is exactly to describe the most important basic theories of command, control, communications, and information process field.
Sampling thheorem can be decomposed in field of signal processing from two stages: on the one hand describe adopting to signal
Sample process, this stage are to carry out discretization to analog input signal, are converted into the signal sample of discrete time discrete amplitude
This sequence；It is the process for carrying out rebuilding to restore the analog signal of input to obtained sample sequence on the other hand,
This stage generally requires low-pass filter and digital analog converter part to realize.Entire restructuring procedure is equivalent to interpolation fitting, this
In have a frequency band limitation to input signal, the half of its highest frequency no more than system sampling frequency, therefore low sampling
The signal that rate needs to acquire high bandwidth just needs to use multiple ADC parallel connection acquisition techniques and realizes.
In today that cost is controlled, may be implemented to acquire under low sampling rate especially in zero-if architecture wide
In the case where bandwidth, multichannel time-interleaved AD C is a kind of feasible mode, and basic principle is as shown in Figure 1, with M ADC
It is parallel under same clock frequency, different clocks phase that analog input signal is sampled, finally in order by M ADC
Output sequence merge into all the way signal output.M channel time interlocks ADC in the case where keeping single channel ADC precision, and sample rate improves
M times.But multichannel time-interleaved AD C, there is also serious defect, the sampling time sequence mismatch in channel will limit M-ADC's
Sampling performance.
As shown in Figure 1, ADC1、…ADCM-1Successively input waveform is sampled, is divided between adjacent time sampling twice
Ts=1/fs, stagger successively fixed 2 π of a phase/M and be equivalent to and the sample rate of ADC is improved into M after Back end data recombination
Times, and resolution ratio maintains the numerical value of low speed ADC, that is, uses the ADC parallel acquisition of multi-disc low-speed high-resolution, realize high-speed,
High-resolution acquisition system, to solve the contradiction of monolithic ADC medium-rate and resolution ratio.Fig. 2 provides 4 road ADC acquisition simulation
The process example of signal.
Figure it is seen that the clock of 4 road ADC needs strictly to differ certain phase, otherwise collected signal can be produced
Raw distortion, as shown in figure 3, sequential logic mismatch can to acquire signal generation deflection, the performance on frequency domain is exactly should not have
It will appear signal (spur in Fig. 3) in frequency, this generates very big interference to demodulating system.Therefore, it is a kind of right to need at present
The method that the sequential logic mismatch of multichannel time-interleaved AD C compensates.
Summary of the invention
The embodiment of the present invention provides the timing compensation method and device of multichannel time-interleaved AD C a kind of, to realize pair
The sequential logic mismatch of multichannel time-interleaved AD C compensates.
According to embodiments of the present invention, the timing compensation method of multichannel time-interleaved AD C a kind of is provided, when the multichannel
Between staggeredly ADC include calibration ADC and at least one acquisition ADC, comprising:
The periodic signal for setting duration is inputted into the calibration ADC；
Selected sampled point is obtained from each initial samples point of the calibration ADC；
According to it is described calibration ADC each initial samples point and the periodic signal determine each selected sampled point when
Between offset；
Using each selected sampled point time bias value to it is described at least one acquisition ADC in the setting duration
Actual samples point compensates.
Specifically, obtaining selected sampled point from each initial samples point of the calibration ADC, specifically include:
First initial samples point and the last one initial samples point will be removed in each initial samples point of the calibration ADC
Except initial samples point generate initial samples point sequence；
Whole initial samples points in the initial samples point sequence are chosen as selected sampled point；Alternatively, described in choosing
The initial samples point of even number position is as selected sampled point in initial samples point sequence；Alternatively, choosing the initial samples point sequence
The initial samples point of odd positions is as selected sampled point in column.
Specifically, determining that each select is adopted according to each initial samples point of the calibration ADC and the periodic signal
The time bias value of sampling point, specifically includes:
Sampled point is selected for each, is executed:
First adjacent with current selected sampled point two sides is obtained from each initial samples point of the calibration ADC
Initial samples point is referred to reference to initial samples point and second；
Calculate the first reference sample point sampling instant and described second with reference to initial samples point sampling instant
The intermediate samples moment；
The intermediate samples moment corresponding sampled value is obtained from the periodic signal, obtains the current selected sampling
The sampled value of the ideal point of point；
According to described first with reference to the sampled value of initial samples point, the sampled value of the second reference initial samples point, institute
State the sampled value of current selected sampled point and the ideal point of the current selected sampled point sampled value determine it is described current
The time bias value of selected sampled point.
Specifically, according to the sampled value of the first reference initial samples point, the described second adopting with reference to initial samples point
The sampled value of the ideal point of sample value, the sampled value of the current selected sampled point and the current selected sampled point determines institute
The time bias value for stating current selected sampled point, specifically includes:
The time bias value Δ t of the current selected sampled point is determined according to following formula:
Wherein, Y1Sampled value, Y for the first reference initial samples point3For the described second adopting with reference to initial samples point
Sample value, Y2For the sampled value of the current selected sampled point, Y0For the sampling of the ideal point of the current selected sampled point
Value, β=Δ t/T, T indicate the sampling period.
Specifically, using the time bias value of each selected sampled point at least one acquisition ADC in the setting
Actual samples point in duration compensates, and specifically includes:
ADC is acquired for each, is executed:
The sampling with each selected sampled point is obtained in the actual samples point in the setting duration from current acquisition ADC
Moment identical actual samples point, obtains compensating sampling point；
The sampling instant of corresponding compensating sampling point is repaid using the time bias value complement of each selected sampled point.
According to embodiments of the present invention, the timing compensation device of multichannel time-interleaved AD C a kind of, the multichannel are also provided
Time-interleaved AD C includes calibration ADC and at least one acquisition ADC, comprising:
Input module, the periodic signal for that will set duration input the calibration ADC；
Module is obtained, for obtaining selected sampled point from each initial samples point of the calibration ADC；
Determining module determines each for each initial samples point and the periodic signal according to the calibration ADC
The time bias value of selected sampled point；
Compensating module, for using the time bias value of each selected sampled point at least one acquisition ADC in institute
The actual samples point stated in setting duration compensates.
Specifically, the acquisition module, is specifically used for:
First initial samples point and the last one initial samples point will be removed in each initial samples point of the calibration ADC
Except initial samples point generate initial samples point sequence；
Whole initial samples points in the initial samples point sequence are chosen as selected sampled point；Alternatively, described in choosing
The initial samples point of even number position is as selected sampled point in initial samples point sequence；Alternatively, choosing the initial samples point sequence
The initial samples point of odd positions is as selected sampled point in column.
Specifically, the determining module, is specifically used for:
Sampled point is selected for each, is executed:
First adjacent with current selected sampled point two sides is obtained from each initial samples point of the calibration ADC
Initial samples point is referred to reference to initial samples point and second；
Calculate the first reference sample point sampling instant and described second with reference to initial samples point sampling instant
The intermediate samples moment；
The intermediate samples moment corresponding sampled value is obtained from the periodic signal, obtains the current selected sampling
The sampled value of the ideal point of point；
According to described first with reference to the sampled value of initial samples point, the sampled value of the second reference initial samples point, institute
State the sampled value of current selected sampled point and the ideal point of the current selected sampled point sampled value determine it is described current
The time bias value of selected sampled point.
Specifically, the determining module, for according to the described first sampled value, second ginseng with reference to initial samples point
Examine the ideal of the sampled value of initial samples point, the sampled value of the current selected sampled point and the current selected sampled point
The sampled value of point determines the time bias value of the current selected sampled point, is specifically used for:
The time bias value Δ t of the current selected sampled point is determined according to following formula:
Wherein, Y1Sampled value, Y for the first reference initial samples point3For the described second adopting with reference to initial samples point
Sample value, Y2For the sampled value of the current selected sampled point, Y0For the sampling of the ideal point of the current selected sampled point
Value, β=Δ t/T, T indicate the sampling period.
Specifically, the compensating module, is specifically used for:
ADC is acquired for each, is executed:
The sampling with each selected sampled point is obtained in the actual samples point in the setting duration from current acquisition ADC
Moment identical actual samples point, obtains compensating sampling point；
The sampling instant of corresponding compensating sampling point is repaid using the time bias value complement of each selected sampled point.
The present invention has the beneficial effect that:
The embodiment of the present invention provides the timing compensation method and device of multichannel time-interleaved AD C a kind of, by that will set
The periodic signal of duration inputs the calibration ADC；Selected sampled point is obtained from each initial samples point of the calibration ADC；Root
The time bias value of each selected sampled point is determined according to each initial samples point and the periodic signal of the calibration ADC；
Actual samples using the time bias value of each selected sampled point at least one described acquisition ADC in the setting duration
Point compensates.In the program, time benefit can be carried out for the actual samples point of at least one acquisition ADC within the set duration
It repays, so as to avoid the mismatch of at least one acquisition ADC timing.
Detailed description of the invention
Fig. 1 is the schematic illustration of multichannel time alternative ADC in the prior art；
Fig. 2 is the schematic diagram that 4 road ADC acquire analog signal in the prior art；
Fig. 3 is distorted signal schematic diagram corresponding with Fig. 2；
Fig. 4 is a kind of structural schematic diagram of multichannel time-interleaved AD C in the embodiment of the present invention；
Fig. 5 is a kind of flow chart of the timing compensation method of multichannel time-interleaved AD C in the embodiment of the present invention；
Fig. 6 is the schematic diagram of ideal point and actual samples point in the embodiment of the present invention；
Fig. 7 is each point line schematic diagram based on Fig. 6 in the embodiment of the present invention；
Fig. 8 is a kind of structural schematic diagram of the timing compensation device of multichannel time-interleaved AD C in the embodiment of the present invention.
Specific embodiment
In order to realize that the sequential logic mismatch to multichannel time-interleaved AD C compensates, it is more that the embodiment of the present invention provides one kind
Channel time interlocks the timing compensation method of ADC, and multichannel time-interleaved AD C includes calibration ADC and at least one acquisition ADC,
As shown in figure 4, calibration ADC is ADC0, at least one acquisition ADC is ADC1-ADCN, the process of this method is as shown in figure 5, execute
Steps are as follows:
S51: the periodic signal input calibration ADC of duration will be set.
Wherein, setting duration can be determined according at least one acquisition ADC, same at least one acquisition ADC to ensure
Step specifically can be set as the duration that at least one acquisition ADC is acquired every time；Periodic signal can be set according to actual needs
It is fixed, for example, it may be simple tone signal, is also possible to historical signal.
S52: selected sampled point is obtained from each initial samples point of calibration ADC.
The periodic signal of ADC acquisition within the set duration is calibrated, obtained sampled point can be defined as initial samples point, by
It is many in each initial samples point of calibration ADC, it can therefrom selected part or all as selected sampled point.
S53: determine that the time of each selected sampled point mends according to each initial samples point of calibration ADC and periodic signal
Repay value.
S54: the reality using the time bias value of each selected sampled point at least one acquisition ADC within the set duration
Sampled point compensates.
In the program, time bias can be carried out for the actual samples point of at least one acquisition ADC within the set duration, from
And it can be to avoid the mismatch of at least one acquisition ADC timing.
Specifically, above-mentioned S52's obtains selected sampled point from each initial samples point of calibration ADC, real process is specifically wrapped
It includes:
By in each initial samples point for calibrating ADC in addition to first initial samples point and the last one initial samples point
Initial samples point generate initial samples point sequence；
Whole initial samples points in initial samples point sequence are chosen as selected sampled point；Alternatively, choosing initial samples
The initial samples point of even number position is as selected sampled point in point sequence；Alternatively, choosing odd positions in initial samples point sequence
Initial samples point as selected sampled point.
It, can not due to first initial samples point and only one adjacent initial samples point of the last one initial samples point
Using the method in the present embodiment, therefore, the two initial samples points can be excluded, each initial samples of ADC will be calibrated
Initial samples point in point in addition to first initial samples point and the last one initial samples point generates initial samples point sequence.
Then whole initial samples points in initial samples point sequence are chosen as selected sampled point；It can also choose initial
The initial samples point of even number position in point sequence is sampled as selected sampled point；Odd number in initial samples point sequence can also be chosen
The initial samples point of position is as selected sampled point.Here three kinds of selection modes are only listed, can be adopted there are also many modes
With no longer repeating one by one here.
Specifically, determining each select according to each initial samples point and periodic signal of calibration ADC in above-mentioned S53
The time bias value of sampled point, realization process specifically include:
Sampled point is selected for each, is executed；
First adjacent with current selected sampled point two sides is obtained from each initial samples point of calibration ADC with reference to initial
Sampled point and second refers to initial samples point；
Calculate the intermediate samples of the sampling instant of the first reference sample point and the sampling instant of the second reference initial samples point
Moment；
Intermediate samples moment corresponding sampled value is obtained from periodic signal, obtains the ideal of current selected sampled point
The sampled value of point；
It is adopted according to first with reference to the sampled value of initial samples point, sampled value, the current selected of the second reference initial samples point
The sampled value of the ideal point of the sampled value and current selected sampled point of sampling point determines the time bias of current selected sampled point
Value.
Specifically, can determine the time bias value Δ t of current selected sampled point according to following formula:
Wherein, Y1Sampled value, Y for the first reference initial samples point3For the sampling of the second reference initial samples point
Value, Y2For the sampled value of the current selected sampled point, Y0For the sampled value of the ideal point of the current selected sampled point, β
=Δ t/T, T indicate the sampling period.
The derivation process of the formula is described below.
As shown in fig. 6, if it is ideal sampling clock, then sampling instant X1、X0、X3It certainly is equally spaced, correspondence
Sampled value be respectively Y1、Y0、Y3, but in reality, be all equal interval sampling there is no this any moment, sometimes can
Fall in X2Point, i.e. sampling clock deflection situation, corresponding collected value is Y2。
These are put and carries out line analysis, as shown in fig. 6, Δ t indicates the skewed clock generated, that is, current selected
The time bias value of sampled point, T indicate the sampling period, and wherein T=1/f, f are sample frequency, it is assumed that β=Δ t/T, according to triangle
Formula relationship has:
To under the conversion of above-mentioned two formula, have:
It can also be obtained from Fig. 7:
FX0=FB+BX0=FB+Y1
EX0=ED+DX0=ED+Y3 (5)
Theorem proving Y can be used0For the intermediate point of FE, this conclusion is directly used herein, no longer carries out process derivation,
Have:
Y0=(FX0+EX0)/2 (6)
Therefore, have:
In formula 7, only one β of unknown number, Y0It can be found out in the comparison of wave shape of front and back.Therefore, Δ t can be from the formula
In find out.By the formula, the time bias value of each selected sampled point can be found out.
Specifically, the time bias value using each selected sampled point in above-mentioned S54 is setting at least one acquisition ADC
Actual samples point in timing is long compensates, and realization process specifically includes:
ADC is acquired for each, is executed:
The sampling instant with each selected sampled point is obtained from the actual samples point of current acquisition ADC within the set duration
Identical actual samples point, obtains compensating sampling point；
The sampling instant of corresponding compensating sampling point is repaid using the time bias value complement of each selected sampled point.
Due to getting the time bias value of each selected sampled point, so that it may to each acquisition ADC in setting duration
The actual samples point of interior identical sampling instant compensates.
Based on the same inventive concept, the embodiment of the present invention provides the timing compensation device of multichannel time-interleaved AD C a kind of,
Multichannel time-interleaved AD C includes calibration ADC and at least one acquisition ADC, and the structure of the device is as shown in Figure 8, comprising:
Input module 81, the periodic signal for that will set duration input calibration ADC；
Module 82 is obtained, for obtaining selected sampled point from each initial samples point of calibration ADC；
Determining module 83 determines that each select is adopted for each initial samples point and periodic signal according to calibration ADC
The time bias value of sampling point；
Compensating module 84 is setting at least one acquisition ADC for the time bias value using each selected sampled point
Actual samples point in duration compensates.
In the program, time bias can be carried out for the actual samples point of at least one acquisition ADC within the set duration, from
And it can be to avoid the mismatch of at least one acquisition ADC timing.
Specifically, obtaining module 82, it is specifically used for:
By in each initial samples point for calibrating ADC in addition to first initial samples point and the last one initial samples point
Initial samples point generate initial samples point sequence；
Whole initial samples points in initial samples point sequence are chosen as selected sampled point；Alternatively, choosing initial samples
The initial samples point of even number position is as selected sampled point in point sequence；Alternatively, choosing odd positions in initial samples point sequence
Initial samples point as selected sampled point.
Specifically, determining module 83, is specifically used for:
Sampled point is selected for each, is executed:
First adjacent with current selected sampled point two sides is obtained from each initial samples point of calibration ADC with reference to initial
Sampled point and second refers to initial samples point；
Calculate the intermediate samples of the sampling instant of the first reference sample point and the sampling instant of the second reference initial samples point
Moment；
Intermediate samples moment corresponding sampled value is obtained from periodic signal, obtains the ideal of current selected sampled point
The sampled value of point；
It is adopted according to first with reference to the sampled value of initial samples point, sampled value, the current selected of the second reference initial samples point
The sampled value of the ideal point of the sampled value and current selected sampled point of sampling point determines the time bias of current selected sampled point
Value.
Specifically, determining module 83, for according to first with reference to initial samples point sampled value, second refer to initial samples
The sampled value of the ideal point of sampled value, the sampled value of current selected sampled point and the current selected sampled point put determines current
The time bias value of selected sampled point, is specifically used for:
The time bias value Δ t of current selected sampled point is determined according to following formula:
Wherein, Y1Sampled value, Y for the first reference initial samples point3For the described second adopting with reference to initial samples point
Sample value, Y2For the sampled value of the current selected sampled point, Y0For the sampling of the ideal point of the current selected sampled point
Value, β=Δ t/T, T indicate the sampling period.
Specifically, compensating module 84, is specifically used for:
ADC is acquired for each, is executed:
The sampling instant with each selected sampled point is obtained from the actual samples point of current acquisition ADC within the set duration
Identical actual samples point, obtains compensating sampling point；
The sampling instant of corresponding compensating sampling point is repaid using the time bias value complement of each selected sampled point.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
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.
Although alternative embodiment of the invention has been described, created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So the following claims are intended to be interpreted as include can
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of timing compensation method of multichannel time interleaving digital analog converter ADC, the multichannel time-interleaved AD C include
Calibrate ADC and at least one acquisition ADC characterized by comprising
The periodic signal for setting duration is inputted into the calibration ADC；
Selected sampled point is obtained from each initial samples point of the calibration ADC；
Determine that the time of each selected sampled point mends according to each initial samples point of the calibration ADC and the periodic signal
Repay value；
Reality using the time bias value of each selected sampled point at least one described acquisition ADC in the setting duration
Sampled point compensates.
2. the method as described in claim 1, which is characterized in that obtained from each initial samples point of the calibration ADC selected
Sampled point specifically includes:
By in each initial samples point of the calibration ADC in addition to first initial samples point and the last one initial samples point
Initial samples point generate initial samples point sequence；
Whole initial samples points in the initial samples point sequence are chosen as selected sampled point；Alternatively, choosing described initial
The initial samples point of even number position in point sequence is sampled as selected sampled point；Alternatively, choosing in the initial samples point sequence
The initial samples point of odd positions is as selected sampled point.
3. the method as described in claim 1, which is characterized in that according to each initial samples point of the calibration ADC and institute
The time bias value that periodic signal determines each selected sampled point is stated, is specifically included:
Sampled point is selected for each, is executed:
First reference adjacent with current selected sampled point two sides is obtained from each initial samples point of the calibration ADC
Initial samples point and second refers to initial samples point；
Calculate the centre of the sampling instant of the first reference sample point and the sampling instant of the second reference initial samples point
Sampling instant；
The intermediate samples moment corresponding sampled value is obtained from the periodic signal, obtains the current selected sampled point
The sampled value of ideal point；
According to described first with reference to initial samples point sampled value, described second with reference to initial samples point sampled value, described work as
The sampled value of the ideal point of the sampled value of preceding selected sampled point and the current selected sampled point determines the current selected
The time bias value of sampled point.
4. method as claimed in claim 3, which is characterized in that according to the sampled value of the first reference initial samples point, institute
Second is stated with reference to the sampled value of initial samples point, the sampled value of the current selected sampled point and the current selected sampled point
The sampled value of ideal point determines the time bias value of the current selected sampled point, specifically includes:
The time bias value Δ t of the current selected sampled point is determined according to following formula:
Wherein, Y1Sampled value, Y for the first reference initial samples point3For the sampling of the second reference initial samples point
Value, Y2For the sampled value of the current selected sampled point, Y0For the sampled value of the ideal point of the current selected sampled point, β
=Δ t/T, T indicate the sampling period.
5. the method as described in claim 1-4 is any, which is characterized in that use the time bias value pair of each selected sampled point
Actual samples point of at least one the described acquisition ADC in the setting duration compensates, and specifically includes:
ADC is acquired for each, is executed:
The sampling instant with each selected sampled point is obtained in the actual samples point in the setting duration from current acquisition ADC
Identical actual samples point, obtains compensating sampling point；
The sampling instant of corresponding compensating sampling point is repaid using the time bias value complement of each selected sampled point.
6. a kind of timing compensation device of multichannel time-interleaved AD C, the multichannel time-interleaved AD C include calibration ADC and
At least one acquisition ADC characterized by comprising
Input module, the periodic signal for that will set duration input the calibration ADC；
Module is obtained, for obtaining selected sampled point from each initial samples point of the calibration ADC；
Determining module determines each selected for each initial samples point and the periodic signal according to the calibration ADC
The time bias value of sampled point；
Compensating module sets at least one acquisition ADC described for the time bias value using each selected sampled point
Actual samples point in timing is long compensates.
7. device as claimed in claim 6, which is characterized in that the acquisition module is specifically used for:
By in each initial samples point of the calibration ADC in addition to first initial samples point and the last one initial samples point
Initial samples point generate initial samples point sequence；
Whole initial samples points in the initial samples point sequence are chosen as selected sampled point；Alternatively, choosing described initial
The initial samples point of even number position in point sequence is sampled as selected sampled point；Alternatively, choosing in the initial samples point sequence
The initial samples point of odd positions is as selected sampled point.
8. device as claimed in claim 6, which is characterized in that the determining module is specifically used for:
Sampled point is selected for each, is executed:
First reference adjacent with current selected sampled point two sides is obtained from each initial samples point of the calibration ADC
Initial samples point and second refers to initial samples point；
Calculate the centre of the sampling instant of the first reference sample point and the sampling instant of the second reference initial samples point
Sampling instant；
The intermediate samples moment corresponding sampled value is obtained from the periodic signal, obtains the current selected sampled point
The sampled value of ideal point；
According to described first with reference to initial samples point sampled value, described second with reference to initial samples point sampled value, described work as
The sampled value of the ideal point of the sampled value of preceding selected sampled point and the current selected sampled point determines the current selected
The time bias value of sampled point.
9. device as claimed in claim 8, which is characterized in that the determining module, for initial according to first reference
Sampled value, the sampled value of the current selected sampled point and the institute of the sampled value of sampled point, the second reference initial samples point
The sampled value for stating the ideal point of current selected sampled point determines the time bias value of the current selected sampled point, specific to use
In:
The time bias value Δ t of the current selected sampled point is determined according to following formula:
Wherein, Y1Sampled value, Y for the first reference initial samples point3For the sampling of the second reference initial samples point
Value, Y2For the sampled value of the current selected sampled point, Y0For the sampled value of the ideal point of the current selected sampled point, β
=Δ t/T, T indicate the sampling period.
10. the device as described in claim 6-9 is any, which is characterized in that the compensating module is specifically used for:
ADC is acquired for each, is executed:
The sampling instant with each selected sampled point is obtained in the actual samples point in the setting duration from current acquisition ADC
Identical actual samples point, obtains compensating sampling point；
The sampling instant of corresponding compensating sampling point is repaid using the time bias value complement of each selected sampled point.
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| CN201811551852.4A CN109639278A (en) | 2018-12-19 | 2018-12-19 | The timing compensation method and device of multichannel time-interleaved AD C |
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