CN113438066B - Multi-channel device and signal processing method for multi-channel device - Google Patents
Multi-channel device and signal processing method for multi-channel device Download PDFInfo
- Publication number
- CN113438066B CN113438066B CN202110985242.0A CN202110985242A CN113438066B CN 113438066 B CN113438066 B CN 113438066B CN 202110985242 A CN202110985242 A CN 202110985242A CN 113438066 B CN113438066 B CN 113438066B
- Authority
- CN
- China
- Prior art keywords
- channel signal
- signal
- channel
- amplitude
- sampling point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
Abstract
A multi-channel device and a signal processing method for a multi-channel device, comprising: each signal channel is used for carrying out analog-to-digital conversion on channel signals input from the outside and then outputting the channel signals to the control processing module, or carrying out digital-to-analog conversion on the channel signals output by the control processing module and then outputting the channel signals to external equipment; the control processing module is used for acquiring a current channel signal and a reference channel signal, and performing phase compensation on the current channel signal according to a phase offset value between the current channel signal and the reference channel signal, the amplitude of the current channel signal and the clock period of the multi-channel device so as to compensate the phase offset between the current channel signal and the reference channel signal, so that signals transmitted in each signal channel in the multi-channel device are aligned.
Description
Technical Field
The invention relates to the technical field of multi-channel equipment, in particular to multi-channel equipment and a signal processing method for the multi-channel equipment.
Background
The multi-channel device refers to a device having a plurality of analog channels, such as a waveform generator, a digital oscilloscope, and the like, and due to the influence of factors such as the non-strict consistency of analog device distribution parameters and PCB routing lengths in each analog channel, signals with the same frequency and phase have phase shift when being transmitted by different analog channels, so that the signals of each channel input or output in the multi-channel device are not completely consistent.
The development of the electronic technology, the communication technology and the like in the world is fast, the signal frequency is higher and higher, the signal bandwidth is larger and higher, the sampling rate is higher and higher, and the influence of the distribution parameters of analog devices and the PCB level routing delay on analog signals is larger and larger. With the increase of complexity of electronic systems, single analog signal systems or digital systems are decreasing, and more are digital-analog hybrid systems; in a multi-channel device, analog signals and digital signals are converted to each other, but the distribution parameters of analog devices are not consistent from channel to channel, and the PCB wiring is different, so that signals from the digital domain to the analog domain or from the analog domain to the digital domain have more or less different phase offsets. In a test measurement system, channel-to-channel signal misalignment is intolerable, meaning that the test measurements are inaccurate.
Two prior art methods are used to eliminate the influence of phase offset values between channels, the first method involves conversion from digital domain to analog domain, such as a digital signal source, and a user compensates for the phase offset caused by a channel by adjusting the initial phase of an output signal of the channel of the digital signal source, but this is troublesome because different phase offset values need to be set at different frequencies; different initial phase values are required to be set under different frequencies and different parameters, so that the operation is troublesome; therefore, this method can be applied only to a signal generating apparatus and is not suitable for a test apparatus such as a digital oscilloscope. The second method, which involves converting the analog domain to the digital domain, such as a digital oscilloscope, achieves the purpose of eliminating the phase offset by adjusting the sampling clock phase of an analog-to-digital converter (ADC), has a drawback that the device needs to ensure that a phase-locked loop is locked when adjusting the phase, and the phase-locked loop needs time, and there is no way to output a signal in real time or output an erroneous signal.
Disclosure of Invention
The invention mainly solves the technical problem of being able to compensate the phase offset of each signal channel of a multi-channel device in the digital domain to align the signals transmitted in each signal channel.
According to a first aspect, there is provided in an embodiment a multi-channel device comprising:
each signal channel is used for receiving an externally input channel signal, performing analog-to-digital conversion on the externally input channel signal and outputting the externally input channel signal to the control processing module, or each signal channel is used for receiving a channel signal output by the control processing module, performing digital-to-analog conversion on the channel signal output by the control processing module and outputting the channel signal to external equipment;
the control processing module is connected with the plurality of signal channels and is used for acquiring a current channel signal and a reference channel signal and performing phase compensation on the current channel signal according to a phase deviation value between the current channel signal and the reference channel signal, the amplitude of the current channel signal and the clock period of the multi-channel equipment so as to align the phases of the current channel signal and the reference channel signal; the reference channel signal is a channel signal transmitted in a selected one of the plurality of signal channels, and the current channel signal is a channel signal transmitted in any one of the plurality of signal channels except the reference channel signal.
According to a second aspect, there is provided in an embodiment a signal processing method for a multi-channel device, comprising:
acquiring a current channel signal and a reference channel signal;
according to a phase deviation value between the current channel signal and the reference channel signal, the amplitude of the current channel signal and the clock period of the multi-channel equipment, performing phase compensation on the current channel signal so as to align the phases of the current channel signal and the reference channel signal;
the reference channel signal is a channel signal transmitted in a selected one of a plurality of signal channels in a multi-channel device, and the current channel signal is a channel signal transmitted in any one of the signal channels except the reference channel signal.
According to the multi-channel device and the signal processing method for the multi-channel device of the embodiment, each signal channel is used for performing analog-to-digital conversion on an externally input channel signal and outputting the channel signal to the control processing module, or performing digital-to-analog conversion on the channel signal output by the control processing module and outputting the channel signal to external equipment; the control processing module is used for acquiring a current channel signal and a reference channel signal, and performing phase compensation on the current channel signal according to a phase offset value between the current channel signal and the reference channel signal, the amplitude of the current channel signal and the clock period of the multi-channel device so as to compensate the phase offset between the current channel signal and the reference channel signal, so that signals transmitted in each signal channel in the multi-channel device are aligned.
Drawings
FIG. 1 shows a conventionalAA schematic diagram of a multi-channel device for converting signal processing in the digital domain to signals in the analog domain;
FIG. 2 is a schematic diagram of phase shift between analog signals;
FIG. 3 is a schematic diagram of a prior art multi-channel device for converting signal processing in the analog domain into signals in the digital domain;
FIG. 4 is a schematic diagram of phase shifts between discrete digital signals;
FIG. 5 is a schematic diagram of a multi-channel device according to an embodiment;
fig. 6(a) is a schematic waveform diagram of the current channel signal and the reference channel signal before right shift compensation, and fig. 6(b) is a schematic waveform diagram of the current channel signal before and after right shift compensation;
FIG. 7(a) is a schematic waveform diagram of the current channel signal and the reference channel signal before left shift compensation, and FIG. 7(b) is a schematic waveform diagram of the current channel signal before and after left shift compensation;
FIG. 8 is a flow diagram of a signal processing method for a multi-channel device of an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
First, a principle of generating a phase shift between signal channels in a multi-channel device is explained, where the multi-channel device includes two types of devices, one is a device that converts a signal in a digital domain into a signal in an analog domain and outputs the signal in the analog domain, such as a waveform generator and a digital signal source; the other is a device that converts externally input signal processing in the analog domain into a signal in the digital domain and outputs the signal in the digital domain, such as a digital oscilloscope. The principles of phase offset generation between the individual signal paths in the two types of multi-path devices described above are also different and will be described in more detail below.
(1) As shown in fig. 1, fig. 1 is a schematic structural diagram of a conventional multi-channel device for converting signal processing in a digital domain into signals in an analog domain. DAC _1, …, DAC _ n represent n digital-to-analog conversion modules (DACs) in a multi-channel device, and analog channel _1, …, analog channel _ n represent n analog channels in the multi-channel device, wherein DAC _1 and analog channel _1 constitute signal channels _1, …, and DAC _ n and analog channel _ n constitute signal channel _ n. The programmable logic device outputs digital signals to each DAC, the digital signals are converted into analog signals through the DAC, the analog signals enter the respective analog channels, the distribution parameters of the analog devices are inconsistent and PCB wiring is different, and as shown in FIG. 2, phase deviation exists in the analog signals output by the analog channels finally. The multichannel equipment is assumed to be a digital signal source with a high sampling rate, two paths of analog signals with the same frequency and phase are originally output, and as a result, the two paths of output analog signals have phase deviation due to analog channels.
(2) Fig. 3 is a schematic structural diagram of a conventional multi-channel device for converting signal processing in an analog domain into signals in a digital domain, as shown in fig. 3. ADC _1, …, ADC _ n represent n analog-to-digital converters (ADCs) of the multi-channel device, analog channel _1, …, analog channel _ n represent n analog channels of the multi-channel device, where ADC _1 and analog channel _1 constitute signal channel _1, … ADC _ n and analog channel _ n constitute signal channel _ n. External input signals reach corresponding ADCs after passing through the analog channels, sampling of the ADCs follows clock beats, and due to inconsistent distribution parameters of analog devices and PCB wiring differences, phase deviation exists in signals finally sent to the ADCs, and as shown in FIG. 4, discrete digital signals converted by the ADCs still have the skew. Assuming that the multi-channel device is a digital oscilloscope with a high sampling rate, the delay timing of signals of two channels is measured, and the test measurement of the digital oscilloscope is inaccurate due to the phase offset introduced by the analog channel.
In the embodiment of the invention, one signal channel is selected from a plurality of signal channels of the multi-channel equipment to be used as a reference signal channel, and channel signals transmitted in the rest signal channels are compensated by taking a channel signal transmitted in the reference signal channel as a reference so as to align signals transmitted in all the signal channels in the multi-channel equipment.
As shown in fig. 5, an embodiment of the present invention provides a multi-channel device, including: a plurality of signal channels 101 and a control processing module 102, wherein the plurality of signal channels 101 are all connected with the control processing module 102.
Each signal channel 101 is configured to receive an externally input channel signal, perform analog-to-digital conversion on the externally input channel signal, and output the externally input channel signal to the control processing module 102, that is, convert an externally input analog domain signal into a digital domain signal, and finally output the digital domain signal to the control processing module 102 for subsequent processing.
In one embodiment, signal path 101 includes: the device comprises a first analog channel and an analog-to-digital conversion module.
The first analog channel is used for receiving an externally input channel signal.
The analog-to-digital conversion module is connected with the first analog channels in a one-to-one correspondence manner, and is configured to perform analog-to-digital conversion on channel signals output by the first analog channels and output the channel signals to the control processing module 102.
Or, each signal channel 101 is configured to receive a channel signal output by the control processing module 102, perform digital-to-analog conversion on the channel signal output by the control processing module, and output the channel signal to an external device, that is, convert a digital domain signal output by the control processing module 102 into an analog domain signal, and finally output the analog domain signal to the external device.
In one embodiment, signal path 101 includes: a digital-to-analog conversion module and a second analog channel.
The digital-to-analog conversion module is used for receiving the compensated channel signal output by the control processing module, performing digital-to-analog conversion on the compensated channel signal and outputting a compensated analog channel signal;
the second analog channels are connected with the digital-to-analog conversion modules in a one-to-one correspondence mode, and the second analog channels are used for receiving the compensated analog channel signals output by the digital-to-analog conversion modules and outputting the analog channel signals to external equipment.
The control processing module 102 is configured to obtain a current channel signal and a reference channel signal, and perform phase compensation on the current channel signal according to a phase offset value between the current channel signal and the reference channel signal, an amplitude of the current channel signal, and a clock cycle of the multi-channel device to obtain a compensated channel signal; the reference channel signal is a channel signal transmitted in a selected one of the plurality of signal channels, and the current channel signal is a channel signal transmitted in any one of the plurality of signal channels except the reference channel signal. In this embodiment, the control processing module may be any existing control processing chip, such as a programmable logic device.
Since the phase offset between the signal channels in the multi-channel device is a relative value, it is necessary to select one signal channel as a reference standard, select one signal channel among the plurality of signal channels in the multi-channel device as a reference signal channel, and align the remaining signal channels to the reference signal channel. In this embodiment, if a signal channel is on the right of the reference signal channel, the signal channel needs to be shifted left to align with the reference signal channel; if a signal channel is to the left of the reference signal channel, then the signal channel needs to be shifted to the right to align with the reference signal channel.
In an embodiment, performing phase compensation on the current channel signal according to a phase offset value between the current channel signal and the reference channel signal, an amplitude of the current channel signal, and a clock cycle of the device, to obtain a compensated channel signal, includes:
acquiring each sampling point in a current channel signal to obtain a plurality of first sampling points; and according to the phase deviation value between the current channel signal and the reference channel signal, the amplitude of each first sampling point and the clock period of the multi-channel equipment, performing left shift or right shift on the first sampling points in the clock direction to obtain the amplitudes of the plurality of compensated first sampling points, namely obtaining the compensated channel signal.
In summary, in this embodiment, any one of the plurality of signal channels is used as the current signal channel, the channel signal transmitted in the current signal channel is the current channel signal, the channel signal transmitted in the reference signal channel is the reference channel signal, and the detailed description is performed according to the phase offset relationship between the current channel signal and the reference channel signal.
(1) When the right shift of the current channel signal is required to remove the phase offset, as shown in fig. 6(a) and 6(b), fig. 6(a) is a waveform diagram of the current channel signal and the reference channel signal before the right shift compensation, and fig. 6(b) is a waveform diagram of the current channel signal before and after the right shift compensation. In fig. 6(a), waveforms of points a and B are waveforms of a current channel signal before compensation, the points a and B are first sampling points at two adjacent sampling moments, waveforms of points E and D are waveforms of a reference channel signal, the point E is a sampling point in the reference channel signal having the same amplitude as the point a, and the point D is a sampling point in the reference channel signal having the same amplitude as the point B. Although it is theoretically desirable that the point a can be moved to the point E and the point B can be moved to the point D, because the frequency and phase of the clock signal are fixed, each sampling point must be output on the clock edge, and therefore the desired output is not actually generated directly, and the point B is moved to the point C, the point a remains constant, and the point C and the point D are essentially on the same straight line, but have different amplitudes. Considering only A, B points, it is desirable to output as points E and D after phase shifting, and the phase shift value T1 may be input by a user, which may be obtained through a previous experiment. Because the sampling points are generated and output on the clock edge in the digital domain, the points E and D are not generated in the digital domain, but the point D can be replaced by the point C, and the point C is on the same clock edge as the point B, so that the amplitude value of the point C can be obtained through a simple proportional relation, and the problem of eliminating the phase shift becomes the problem of how to obtain the amplitude of the point C.
The proportional relationship according to fig. 6(a) yields:
the amplitude of point C can then be found by the following equation:
wherein the content of the first and second substances,
is the sum of the current channel signalsPhase offset values between reference channel signals;
clock cycles for multi-channel devices;
is the amplitude of the first sample point B;
the amplitude of the first sampling point A is shown, and the first sampling point A is the sampling point of the first sampling point B at the previous sampling moment;
is the amplitude of the compensated first sample point B.
After determining the amplitudes of the compensated first sampling points for all the first sampling points in the current channel signal according to the formula for calculating the amplitude of the point C, the compensated current channel signal can be obtained, as shown in fig. 6(b), the dotted line Y1 is the current channel signal after right shift compensation, and the solid line X1 is the current channel signal before right shift compensation.
(2) When the current channel signal needs to be left-shifted to remove the phase offset, as shown in fig. 7(a) and 7(b), fig. 7(a) is a waveform diagram of the current channel signal and the reference channel signal before left-shift compensation, and fig. 7(b) is a waveform diagram of the current channel signal before and after left-shift compensation. In fig. 7(a), waveforms of points F and G are waveforms of a current channel signal before compensation, the points F and G are first sampling points at two adjacent sampling moments, waveforms of points I and J are waveforms of a reference channel signal, the point I is a sampling point in the reference channel signal having the same amplitude as the point F, and the point J is a sampling point in the reference channel signal having the same amplitude as the point G. Although it is theoretically desirable that F point can be moved to I point and G point can be moved to J point, because the frequency and phase of the clock signal are fixed, each sampling point must be output on the clock edge, and therefore the desired output is not actually generated directly, but F point is moved to H point output and G point is moved to K point output, H point and I point are essentially on the same straight line, and K point and J point are essentially on the same straight line, but different in amplitude. Considering only F, G points, it is desirable to output as I point and J point after phase shifting, and the phase shift value T1 may be input by a user, which may be obtained through a previous experiment. Because the sampling points are generated and output on the clock edge in the digital domain, the I point and the J point cannot be generated in the digital domain, but the I point can be replaced by the H point, the H point is on the same clock edge as the F point, the J point can be replaced by the K point, and the K point and the G point are on the same clock edge, so that the amplitude value of the H point can be obtained through a simple proportional relation, and the problem of eliminating the phase shift becomes the problem of how to obtain the amplitude of the H point.
The proportional relationship according to fig. 7(a) yields:
the amplitude of the H-point can then be obtained by the following equation:
wherein the content of the first and second substances,
is the phase offset value between the current channel signal and the reference channel signal;
clock cycles for multi-channel devices;
is the amplitude of the first sample point F;
the amplitude of the first sampling point G is shown, and the first sampling point F is the sampling point of the first sampling point G at the previous sampling moment;
is the amplitude of the compensated first sample point F.
In addition, the amplitude of the point K is also calculated in the manner described above for calculating the amplitude of the point H, which is not described herein again, and the amplitude of all the compensated first sampling points is finally obtained, so that the compensated current channel signal can be obtained, as shown in fig. 7(b), the dashed line Y2 is the current channel signal after left shift compensation, and the solid line X2 is the current channel signal before left shift compensation.
In the embodiment of the present invention, after the channel signals transmitted in each signal channel compensate the phase offset of each channel signal with respect to the reference channel signal according to the left shift or the right shift, the channel signals transmitted in the plurality of signal channels may be completely aligned. In addition, since the first sampling point corresponding to the channel signal transmitted in each signal channel is stable, the point obtained by calculating the left shift or the right shift of the first sampling point is also stable, and the jitter is not increased.
Based on the multi-channel device, as shown in fig. 8, an embodiment of the present invention further provides a signal processing method for a multi-channel device, which is applied to a control processing module and includes steps 201 to 202, which are described in detail below.
Step 201: and acquiring a current channel signal and a reference channel signal.
Step 202: and performing phase compensation on the current channel signal according to the phase deviation value between the current channel signal and the reference channel signal, the amplitude of the current channel signal and the clock period of the multi-channel device to obtain a compensated channel signal.
The reference channel signal is a channel signal transmitted in a selected one of a plurality of signal channels in the multi-channel device, and the current channel signal is a channel signal transmitted in any one of the signal channels except the reference channel signal.
In an embodiment, performing phase compensation on the current channel signal according to a phase offset value between the current channel signal and the reference channel signal, an amplitude of the current channel signal, and a clock cycle of the device, to obtain a compensated channel signal, includes:
step 2021: acquiring each sampling point in a current channel signal to obtain a plurality of first sampling points;
step 2022: and according to the phase deviation value between the current channel signal and the reference channel signal, the amplitude of each first sampling point and the clock period of the multi-channel equipment, performing left shift or right shift on the first sampling points in the clock direction to obtain the amplitudes of the plurality of compensated first sampling points, namely obtaining the compensated channel signal.
In one embodiment, when the first sampling point is shifted to the right in the clock direction, the compensated amplitude of the first sampling point is obtained according to the following formula:
wherein the content of the first and second substances,
is the phase offset value between the current channel signal and the reference channel signal;
clock cycles for multi-channel devices;
is the amplitude of the first sample point B;
the amplitude of the first sampling point A is shown, and the first sampling point A is the sampling point of the first sampling point B at the previous sampling moment;
is the amplitude of the compensated first sample point B.
In another embodiment, when the first sampling point is shifted left in the clock direction, the compensated amplitude of the first sampling point is obtained according to the following formula:
wherein the content of the first and second substances,
is the phase offset value between the current channel signal and the reference channel signal;
clock cycles for multi-channel devices;
is the amplitude of the first sample point F;
the amplitude of the first sampling point G is shown, and the first sampling point F is the sampling point of the first sampling point G at the previous sampling moment;
is the amplitude of the compensated first sample point F.
It should be noted that, the signal processing method provided by the embodiment of the present invention has been described in detail in the above embodiments, and is not described herein again.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (8)
1. A multi-channel device, comprising:
each signal channel is used for receiving an externally input channel signal, performing analog-to-digital conversion on the externally input channel signal and outputting the externally input channel signal to the control processing module, or each signal channel is used for receiving a channel signal output by the control processing module, performing digital-to-analog conversion on the channel signal output by the control processing module and outputting the channel signal to external equipment;
the control processing module is connected with the plurality of signal channels and is used for acquiring a current channel signal and a reference channel signal and performing phase compensation on the current channel signal according to a phase deviation value between the current channel signal and the reference channel signal, the amplitude of the current channel signal and the clock period of the multi-channel equipment so as to align the phases of the current channel signal and the reference channel signal; the reference channel signal is a channel signal transmitted in a selected one of the plurality of signal channels, and the current channel signal is a channel signal transmitted in any one of the plurality of signal channels except the reference channel signal;
according to the phase deviation value between the current channel signal and the reference channel signal, the amplitude of the current channel signal and the clock period of the multi-channel device, the phase compensation is carried out on the current channel signal, and the phase compensation method comprises the following steps:
acquiring each sampling point in a current channel signal to obtain a plurality of first sampling points;
and according to the phase deviation value between the current channel signal and the reference channel signal, the amplitude of each first sampling point and the clock period of the multi-channel equipment, performing left shift or right shift on the first sampling points in the clock direction to obtain the amplitudes of the plurality of compensated first sampling points, namely obtaining the compensated channel signal.
2. The multi-channel device of claim 1, wherein the signal channels comprise:
the first analog channel is used for receiving an externally input channel signal;
the analog-to-digital conversion module is connected with the first analog channels in a one-to-one correspondence manner, and is used for performing analog-to-digital conversion on channel signals output by the first analog channels and outputting the channel signals to the control processing module.
3. The multi-channel device of claim 1, wherein the signal channels comprise:
the digital-to-analog conversion module is used for receiving the compensated channel signal output by the control processing module, performing digital-to-analog conversion on the compensated channel signal and outputting a compensated analog channel signal;
and the second analog channels are connected with the digital-to-analog conversion modules in a one-to-one correspondence manner and are used for receiving the compensated analog channel signals output by the digital-to-analog conversion modules and outputting the analog channel signals to external equipment.
4. The multi-channel device of claim 1, wherein the obtaining of the compensated plurality of first sample points based on a phase offset value between the current channel signal and the reference channel signal, an amplitude of each of the first sample points, and a clock period of the multi-channel device comprises:
when the first sampling point is shifted to the right in the clock direction, the amplitude of the compensated first sampling point is obtained according to the following formula:
wherein the content of the first and second substances,
is the phase offset value between the current channel signal and the reference channel signal;
clock cycles for multi-channel devices;
is the amplitude of the first sample point B;
being a first sampling point AAmplitude, wherein the first sampling point A is a sampling point of the first sampling point B at the previous sampling moment;
is the amplitude of the compensated first sample point B.
5. The multi-channel device of claim 1, wherein the obtaining of the compensated plurality of first sample points based on a phase offset value between the current channel signal and the reference channel signal, an amplitude of each of the first sample points, and a clock period of the multi-channel device comprises:
when the first sampling point is shifted left in the clock direction, the amplitude of the compensated first sampling point is obtained according to the following formula:
wherein the content of the first and second substances,
is the phase offset value between the current channel signal and the reference channel signal;
clock cycles for multi-channel devices;
is the amplitude of the first sample point F;
the amplitude of the first sampling point G is shown, and the first sampling point F is the sampling point of the first sampling point G at the previous sampling moment;
is the amplitude of the compensated first sample point F.
6. A signal processing method for a multi-channel device, comprising:
acquiring a current channel signal and a reference channel signal;
according to a phase deviation value between the current channel signal and the reference channel signal, the amplitude of the current channel signal and the clock period of the multi-channel equipment, performing phase compensation on the current channel signal so as to align the phases of the current channel signal and the reference channel signal;
the reference channel signal is a channel signal transmitted in a selected one of a plurality of signal channels in a multi-channel device, and the current channel signal is a channel signal transmitted in any one of the signal channels except the reference channel signal;
according to the phase deviation value between the current channel signal and the reference channel signal, the amplitude of the current channel signal and the clock period of the multi-channel device, the phase compensation is carried out on the current channel signal, and the phase compensation method comprises the following steps:
acquiring each sampling point in a current channel signal to obtain a plurality of first sampling points;
and according to the phase deviation value between the current channel signal and the reference channel signal, the amplitude of each first sampling point and the clock period of the multi-channel equipment, performing left shift or right shift on the first sampling points in the clock direction to obtain the amplitudes of the plurality of compensated first sampling points, namely obtaining the compensated channel signal.
7. The method of claim 6, wherein deriving the compensated plurality of first sample points based on a phase offset value between the current channel signal and the reference channel signal, an amplitude of each first sample point, and a clock period of the multi-channel device comprises:
when the first sampling point is shifted to the right in the clock direction, the amplitude of the compensated first sampling point is obtained according to the following formula:
wherein the content of the first and second substances,
is the phase offset value between the current channel signal and the reference channel signal;
clock cycles for multi-channel devices;
is the amplitude of the first sample point B;
the amplitude of the first sampling point A is shown, and the first sampling point A is the sampling point of the first sampling point B at the previous sampling moment;
is the amplitude of the compensated first sample point B.
8. The method of claim 6, wherein deriving the compensated plurality of first sample points based on a phase offset value between the current channel signal and the reference channel signal, an amplitude of each first sample point, and a clock period of the multi-channel device comprises:
when the first sampling point is shifted left in the clock direction, the amplitude of the compensated first sampling point is obtained according to the following formula:
wherein the content of the first and second substances,
for the current channel signal and referencePhase offset values between channel signals;
clock cycles for multi-channel devices;
is the amplitude of the first sample point F;
the amplitude of the first sampling point G is shown, and the first sampling point F is the sampling point of the first sampling point G at the previous sampling moment;
is the amplitude of the compensated first sample point F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110985242.0A CN113438066B (en) | 2021-08-26 | 2021-08-26 | Multi-channel device and signal processing method for multi-channel device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110985242.0A CN113438066B (en) | 2021-08-26 | 2021-08-26 | Multi-channel device and signal processing method for multi-channel device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113438066A CN113438066A (en) | 2021-09-24 |
| CN113438066B true CN113438066B (en) | 2021-11-30 |
Family
ID=77797977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110985242.0A Active CN113438066B (en) | 2021-08-26 | 2021-08-26 | Multi-channel device and signal processing method for multi-channel device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113438066B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516361A (en) * | 2012-06-27 | 2014-01-15 | 美国博通公司 | Compensation for lane imbalance in a multi-lane analog-to-digital converter (ADC) |
| CN107863967A (en) * | 2017-11-15 | 2018-03-30 | 中国电子科技集团公司第四十研究所 | A kind of multi-channel synchronous output calibrating installation and method |
| CN111929682A (en) * | 2020-07-22 | 2020-11-13 | 西安瑞得空间信息技术有限公司 | Airborne DBF-TOPS SAR imaging method based on range-direction blocking |
| CN112162281A (en) * | 2020-08-28 | 2021-01-01 | 西安电子科技大学 | Multi-channel SAR-GMTI image domain two-step processing method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100758302B1 (en) * | 2005-12-01 | 2007-09-12 | 한국전자통신연구원 | Apparatus and Method for Phase Recovery and I/Q Imbalance Compensation in a quadrature demodulating receiver |
| US8749410B1 (en) * | 2012-12-19 | 2014-06-10 | Broadcom Corporation | Calibration of interleaving errors in a multi-lane analog-to-digital converter |
| CN107809292A (en) * | 2017-10-09 | 2018-03-16 | 武汉滨湖电子有限责任公司 | A kind of transmission channel multichannel phase means for correcting and bearing calibration |
-
2021
- 2021-08-26 CN CN202110985242.0A patent/CN113438066B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516361A (en) * | 2012-06-27 | 2014-01-15 | 美国博通公司 | Compensation for lane imbalance in a multi-lane analog-to-digital converter (ADC) |
| CN107863967A (en) * | 2017-11-15 | 2018-03-30 | 中国电子科技集团公司第四十研究所 | A kind of multi-channel synchronous output calibrating installation and method |
| CN111929682A (en) * | 2020-07-22 | 2020-11-13 | 西安瑞得空间信息技术有限公司 | Airborne DBF-TOPS SAR imaging method based on range-direction blocking |
| CN112162281A (en) * | 2020-08-28 | 2021-01-01 | 西安电子科技大学 | Multi-channel SAR-GMTI image domain two-step processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113438066A (en) | 2021-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1058387B1 (en) | System with adjustable ADC clock phase | |
| KR101418339B1 (en) | Apparatus of Digital-data Transmission for Controling Multi-channel SQUID System | |
| US10057048B2 (en) | Data handoff between randomized clock domain to fixed clock domain | |
| JP2000341123A (en) | A/d converter and calibration device | |
| CN112260890B (en) | Digital array time delay measuring method | |
| TWI704773B (en) | Analog to digital converter device and method for calibrating clock skew | |
| WO2017113305A1 (en) | Correction device and method | |
| US6809668B2 (en) | Interleaving A/D conversion type waveform digitizer module and a test apparatus | |
| US20160182076A1 (en) | Background Calibration for Digital-to-Analog Converters | |
| JP2009267931A (en) | Analog-to-digital conversion apparatus, analog-to-digital conversion method, tester, and program | |
| CN113438066B (en) | Multi-channel device and signal processing method for multi-channel device | |
| JP4365970B2 (en) | Arbitrary waveform generator and test apparatus equipped with the arbitrary waveform generator | |
| JP2005318630A (en) | Method for phase-shifting bits in digital signal pattern | |
| JP5243401B2 (en) | Electric waveform generator and optical transmitter | |
| US20110181298A1 (en) | Measurement apparatus and test apparatus | |
| JP2008147922A (en) | A/d converting device | |
| CN111641414B (en) | DAC multichip synchronizer based on group delay filter | |
| JP2008278304A (en) | Signal converter | |
| JP4493145B2 (en) | Arbitrary waveform generator | |
| US8406283B2 (en) | Modulation apparatus, test apparatus and correction method | |
| WO2021204387A1 (en) | Circuit for converting a signal between digital and analog | |
| JP2010021665A (en) | Data receiver | |
| CN116991198B (en) | Waveform generator, multi-signal channel delay correction method and medium | |
| CN114465693B (en) | Short-distance multi-node 10MHz signal synchronization method | |
| TW201933785A (en) | Analog-to-digital converter calibration system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |