High-precision power servo method and vector signal transceiver

Abstract

The invention belongs to the technical field of PXIe measuring instruments, and particularly relates to a high-precision power servo method and a vector signal transceiver, the vector signal transceiver comprises a vector signal generator, an analog front end and a vector signal analyzer, the vector signal generator comprises a first debugging module, and the analog front end comprises a second debugging module. The vector signal analyzer comprises a power monitoring module, a logic calculation module and a control module, power servo is carried out in a signal generation stage and a signal link stage through the regulation and control module, and a power regulation and control value is distributed to the main regulation and control module and the micro regulation and control module through a power distribution algorithm, the micro regulation and control module carries out gear quantization on a power regulation and control value to realize linear regulation and control on a power numerical value, and a relatively large dynamic range and relatively high servo precision are achieved on the premise of not influencing a signal-to-noise ratio of a signal; and meanwhile, the control module limits the regulation and control times, so that the regulation and control delay of the system is in a control range.

Description

Technical Field

[0001] The present invention belongs to the technical field of PXIe measuring instruments, and particularly relates to a high-precision power servo method and a vector signal transceiver. Background Art

[0002] With the rapid development of communication and radar technologies, the demand for high-performance, multi-channel, and miniaturized radio frequency signal sources is increasing day by day. Although traditional bench-top vector signal generators are powerful, they generally have problems such as large volume, high price, and poor channel scalability, and are difficult to meet the requirements of modern applications such as MIMO, 5G, and phased array radars. The PXIe (PCI eXtensions for Instrumentation Express) bus technology has become an ideal solution to solve this problem due to its high bandwidth, low latency, and modular characteristics. A vector signal transceiver (VST) based on the PXIe architecture integrates a system for signal generation, frequency agility, fast power control, signal acquisition, and spectral feature extraction and calculation. The vector signal generator (VSG) and the vector signal analyzer (VSA) are integrated in a single module to achieve high-resolution frequency and power control. With the rapid development of signal processing technologies, unprecedented high requirements have been put forward for the accuracy, dynamic range, and real-time performance of signal power control. However, traditional power servo methods are often limited by a single component or a simple feedback control loop, and it is difficult to achieve large dynamic range and high-precision power regulation while ensuring signal quality.

[0003] There are mainly two existing power servo schemes. The first one is achieved by amplitude modulation of the generated signal waveform in the digital domain during the signal generation stage. This scheme can achieve relatively high power servo accuracy, but it is limited by the internal resources of the FPGA and the bit width of the power regulation variable. At the same time, considering the signal-to-noise ratio requirement, the regulation range of power servo during the signal generation stage is not very large, usually not greater than 20 dB. The second one is to perform gain control through a digital controlled attenuator in the signal link. This scheme is simple to implement, but due to the large gain control step value of the digital controlled attenuator, poor linearity, large influence by temperature and frequency, and poor consistency, it cannot achieve high power servo accuracy.

[0004] In a complex electromagnetic environment, the interference received by the signal is diverse. Due to the simple feedback mechanism of traditional methods, it is difficult to respond to these changes quickly and accurately, resulting in a decrease in power control accuracy. At the same time, increasing the dynamic range of power control often comes at the cost of signal quality, especially in application scenarios where high signal-to-noise ratio needs to be maintained, and this contradiction is particularly prominent. Summary of the Invention

[0005] The object of the present invention is to provide a high-precision power servo method and system for a vector signal transceiver, so as to solve at least one problem existing in the background art.

[0006] To achieve the above object, the present invention provides a high-precision power servo method for a vector signal transceiver.

[0007] In a first aspect, an embodiment of the present application provides a high-precision power servo method for a vector signal transceiver to perform power servo on a signal power. The vector signal transceiver includes a vector signal generator and a vector signal analyzer. The vector signal generator includes a first debugging module, and the vector signal analyzer includes a power monitoring module, a logic calculation module, and a control module. The vector signal generator generates an input signal to a device under test, and the device under test outputs a measured signal to the vector signal analyzer. The vector signal transceiver performs power servo simultaneously in a signal generation stage and a signal link stage. The method includes the following steps:

[0008] The power monitoring module obtains the current power value of the output signal and sends the current power value to the control module;

[0009] The control module pre-configures control parameters, and the control parameters include a target power value;

[0010] The control module determines whether the current power value is the same as the target power value. If not, it sends the current power value and the target power value to the logic calculation module;

[0011] The logic calculation module calculates and obtains a power regulation value according to the current power value and the target power value, and sends the power regulation value to the first regulation module;

[0012] The first regulation module regulates the power of the output signal according to the power regulation value to reach the target power value.

[0013] In some embodiments, before the regulation module regulates the power of the output signal according to the power regulation value to reach the target power value, it further includes:

[0014] The control parameters further include a reference power value. The control module selects a suitable reference power value according to the target power value and sends the reference power value to the first regulation module;

[0015] The first regulation module regulates the power of the output signal according to the reference power value and the power regulation value to reach the target power value.

[0016] In some embodiments, the vector signal transceiver further includes an analog front end, the analog front end includes a second regulation module, the control module distributes the power regulation value to the first regulation module and the second regulation module according to a first preset rule, the second regulation module roughly adjusts the power regulation value with a second preset step size, and the first regulation module finely adjusts the power regulation value with a first preset step size to reach the target power value.

[0017] In some embodiments, the second preset step size is greater than the first preset step size.

[0018] In some embodiments, the control parameter further includes a regulation reference value l, the regulation reference value l is an integer multiple of the first preset step size, and the first preset rule includes: judging the magnitude of the power adjustment value and the regulation reference value l, the part of the power adjustment value exceeding the regulation reference value l is sent to the second regulation module, the second regulation module regulates one regulation reference value l each time, and the part of the power regulation value not exceeding the regulation reference value l is sent to the first regulation module.

[0019] In some embodiments, the control parameter further includes a preset reference power range and a bit width parameter, a power gear mapping table is preset in the control module, the power gear mapping table is obtained by multiplying the preset reference power range by the bit width parameter, and the control module multiplies the power regulation value by the bit width parameter to obtain a power regulation gear value.

[0020] In some embodiments, the control parameter further includes the upper and lower limits of the first regulation module and the second regulation module, the regulation range of the first regulation module is m, the regulation gear accuracy of the first regulation module is n, and the corresponding regulation gear is It further includes a gear shifting strategy:

[0021] After distributing the power adjustment value according to the first preset rule, calculate and obtain the remaining adjustable values of the first regulation module and the second regulation module in combination with the upper and lower limits of the first regulation module and the second regulation module, judge the positivity and negativity of the remaining adjustable values. If the remaining adjustable gear value is positive, then

[0022] The control module judges that the power regulation gear value received by the first regulation module is greater than Then increase the power regulation value of the second regulation module by one regulation reference value l, and subtract the regulation gear value of the first regulation module by

[0023] The control module judges that the power regulation gear value received by the first regulation module is less than 0, then increase the power regulation value of the second regulation module by one regulation reference value l, and increase the regulation gear value of the first regulation module by

[0024] If the remaining adjustable value is negative, the adjustment values of the first adjustment module and the second adjustment module are output according to the upper and lower limit values.

[0025] In some embodiments, before the first adjustment module and the second adjustment module adjust the power of the output signal according to the power adjustment value to reach the target power value, it further includes:

[0026] Judge whether the current power value reaches the target power value. If it reaches, jump out of the power control loop;

[0027] If not, when the loop control times is less than the maximum loop times, calculate and obtain the power adjustment value;

[0028] Judge whether the magnitude of the power adjustment value exceeds the upper and lower limit values of the first power adjustment module and the second adjustment module. If so, jump out of the power control loop; if not, send it to the first power adjustment module and the second adjustment module for power adjustment, and the loop control times i = 1; when the loop control times is equal to the maximum loop times, jump out of the power control loop;

[0029] The maximum loop times is q.

[0030] In some embodiments, the power monitoring module includes a sampling module. The power monitoring module obtains the current power value of the output signal, and further includes: the sampling module samples the output signal to obtain a sampling value, and the power monitoring module calculates the mean square value of the sampling value to obtain the current power value.

[0031] In some embodiments, the power monitoring module includes a frequency-domain conversion module. The power monitoring module obtains the current power value of the output signal, and further includes: the frequency-domain conversion module performs a discrete Fourier transform or a fast Fourier transform on the output signal to obtain a first frequency spectrum, and the power monitoring module calculates the sum of squares of the frequency components of the first frequency spectrum to obtain the current power value.

[0032] In a second aspect, the present application further provides a vector signal transceiver. The vector signal transceiver includes a vector signal generator, an analog front end, and a vector signal analyzer. The vector signal generator includes a first debugging module, the analog front end includes a second debugging module, and the vector signal analyzer includes a power monitoring module, a logic calculation module, and a control module, which are used for the vector signal transceiver to perform high-precision servo on the power of the output signal in the signal generation stage and the signal link stage using the method described in any one of the foregoing embodiments.

[0033] In a third aspect, the present application further provides a computer-readable medium, on which a computer program is stored. When the computer program is executed, it can implement a high-precision power servo method described in any one of the foregoing embodiments.

[0034] A high-precision power servo method and system for a vector signal transceiver provided by the present application, through the collaborative work of a control module, a power monitoring module, a logic calculation module, and a regulation module, performs closed-loop power regulation synchronously in the signal generation and signal link stages, ensuring rapid and accurate reaching of the target power, having low servo delay, and combining high precision, strong anti-interference, and wide compatibility, and can be applied to scenarios such as 5G base stations and satellite communications that require precise power control. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a flowchart of the high-precision power servo method provided by an embodiment of the first aspect of the present invention;

[0036] Figure 2 is a schematic block diagram of a vector signal transceiver provided by an embodiment of the first aspect of the present invention;

[0037] Figure 3 is a schematic block diagram of the servo method provided by an embodiment of the first aspect of the present invention;

[0038] Figure 4 is a flowchart of a method provided by another embodiment of the first aspect of the present invention;

[0039] Figure 5 is a flowchart of a method provided by another embodiment of the first aspect of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the accompanying drawings.

[0042] As used in this specification, terms such as "component", "unit", "system", etc. are used to represent computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and a computer. By way of illustration, an application running on a computing device and the computing device can both be components. One or more components can reside in a process and an execution thread, and the components can be located on one computer and distributed between two or more computers. In addition, these components can be executed from various computer-readable media storing various data structures. Components can communicate, for example, through local and remote processes according to a signal having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system, and a network, such as the Internet interacting with other systems through a signal).

[0043] Since the signal generation stage realizes power servo by amplitude modulating the generated signal waveform in the digital domain, it is limited by the internal resources of the FPGA and the bit width of the power regulation variable. At the same time, considering the signal-to-noise ratio requirement, the regulation range of power servo in the signal generation stage is limited; while in the signal link, gain control is performed through a digital controlled attenuator. However, due to the large gain control step value of the digital controlled attenuator, poor linearity, and large influence by temperature and frequency, the consistency is poor, and a high power servo accuracy cannot be achieved.

[0044] Furthermore, the present application provides a method and system for high-precision power servo.

[0045] The present invention provides a high-precision power servo method for testing the power servo of a system. Specifically, it can be applied to the signal output power servo of a transmitter end, such as a vector signal generator, and can also be applied to the power servo of a transmission signal in a signal link, such as an analog front end, to generate a signal that meets the target power value. It does not strictly depend on special system hardware, and for other types of waveform generators or front-end gain control systems, power servo can also be performed, and the power servo configuration can be flexibly adjusted according to attenuators and sampling chips with different specification parameters to match the power servo accuracy.

[0046] Figure 1 is a flowchart of the high-precision power servo method provided by an embodiment of the first aspect of the present invention.

[0047] Figure 2 is a schematic block diagram of a vector signal transceiver provided by an embodiment of the first aspect of the present invention.

[0048] Figure 3 is a schematic block diagram provided by an embodiment of the first aspect of the present invention.

[0049] Combined withFigure 2 and Figure 3 As shown, the vector signal transceiver includes a vector signal generator 1 and a vector signal analyzer 3. The vector signal generator 1 includes a first debugging module 40. The vector signal analyzer 3 includes a power monitoring module 20, a logic calculation module 30, and a control module 10. The vector signal generator 1 generates an input signal to the device under test (DUT). The DUT outputs a measured signal to the vector signal analyzer 3. The vector signal transceiver performs power servo during both the signal generation stage and the signal link stage. Combining Figure 1 As shown, the method includes the following steps:

[0050] Step S1, the power monitoring module 20 obtains the current power value of the output signal and sends the current power value to the control module 10;

[0051] Step S2, the control module 10 pre-configures control parameters, and the control parameters include a target power value;

[0052] Step S3, the control module 10 determines whether the current power value is the same as the target power value. If not, it sends the current power value and the target power value to the logic calculation module 30;

[0053] Step S4, the logic calculation unit calculates a power regulation value based on the current power value and the target power value and sends the power regulation value to the first regulation module 40;

[0054] Step S5, the first regulation module 40 regulates the current power value of the output signal according to the power regulation value to reach the target power value.

[0055] In this embodiment, the control module 10 determines the power regulation value based on the current power value and the target power value obtained by the power monitoring module 20, and sends it to the first regulation module 40 for power regulation, so that the signal generator outputs a signal with the target power value to the DUT.

[0056] Figure 4 It is a flowchart of the method provided by another embodiment of the first aspect of the present invention.

[0057] As Figure 4 shown, in some embodiments, before the first regulation module 40 regulates the power of the output signal according to the power regulation value to reach the target power value, it further includes:

[0058] Step S11, the control parameters further include a reference power value. The control module 10 selects a suitable reference power value according to the target power value and sends the reference power value to the first regulation module 40.

[0059] Step S12: The first regulation module 40 regulates the power of the output signal according to the reference power value to approximate the target power value.

[0060] Specifically, the first regulation module 40 has a need for large-range regulation, that is, the reference power value needs to vary within a certain range rather than being fixed. By adjusting the reference power value, the regulation range of the first regulation module 40 can reach a quite large dynamic range:

[0061] The control module 10 selects a suitable reference power value for the first regulation module 40 to make the current power value as close as possible to the target power value, reducing the number of regulations and the power servo delay.

[0062] In some embodiments, the vector signal transceiver further includes an analog front end 2, and the analog front end 2 includes a second regulation module 50. The control module 10 distributes the power regulation value to the first regulation module 40 and the second regulation module 50 according to a first preset rule. The second regulation module 50 roughly adjusts the power regulation value with a second preset step size, and the first regulation module 40 finely adjusts the power regulation value with the second preset step size to reach the target power value. The second preset step size is greater than the first preset step size.

[0063] In this embodiment, the second regulation module 50 is configured in the analog front end 2 to perform power servo on the signal link. Specifically, the second regulation module 50 is a digital control attenuator with a maximum attenuation value of 30 dB. Implementably, attenuators with different attenuation specifications can be selected according to the test system configuration, and the present application does not limit this.

[0064] The power servo method provided in this embodiment performs power servo on both the vector signal generator 1 and the analog front end 2 at the same time, divides the power control amount into two parts through a specific algorithm, and regulates the vector signal generator 1 and the analog front end 2 respectively. This method can achieve a large dynamic range and high servo accuracy, and has good linearity without affecting the signal-to-noise ratio.

[0065] In some embodiments, the control parameter further includes a regulation reference value l, and the regulation reference value l is an integer multiple of the first preset step size. The first preset rule includes: judging the magnitude of the power adjustment value and the regulation reference value l, and sending the part of the power adjustment value that exceeds the regulation reference value l to the second regulation module 50. The second regulation module 50 regulates one regulation reference value l each time, and sending the part of the power regulation value that does not exceed the regulation reference value l to the first regulation module 40.

[0066] In this embodiment, the first preset step of the second regulation module 50 is 0.5 dB, that is, the regulation value of the second regulation module 50 must be an integer multiple of 0.5 dB. In this embodiment, calculations are performed in units of 2 dB to determine that the regulation reference value l is 2 dB. The part exceeding 2 dB is adjusted by the second regulation module 50, and the part less than 2 dB is adjusted by the first regulation module 40. Implementably, different regulation reference values can be selected according to the test system configuration to meet the needs of the test system, and this application does not limit this.

[0067] In some embodiments, the power monitoring module 20 and the control module 10 are configured in the vector signal analyzer 3 to monitor the signal power and feedback the power regulation value to the first regulation module 40 and the second regulation module 50. Since the power attenuation linearity of the second regulation module 50 is poor, a power gear mapping table is preset in the control module 10. The control parameters also include a preset reference power range and a bit width parameter. The power gear mapping table is obtained by multiplying the preset reference power range by the bit width parameter. In this embodiment, the preset reference power range is 0 - (-100 dB), and the bit width parameter takes the 18-bit gear value. 18 bits are 262,144 gears, and each gear in the total 100 dB gears is about 0.00038 dB, with high precision. Implementably, the user can also select other bit width parameters. The higher the precision, the higher the power servo precision, and the higher the requirements for the product hardware, such as 1 bit, 8 bits, 24 bits, and this application does not limit this.

[0068] In some embodiments, the upper and lower limits of the first regulation module and the second regulation module are further included. The regulation range of the first regulation module is m, the regulation gear precision of the first regulation module is n, and the corresponding regulation gear is The power servo method further includes a gear shifting method:

[0069] The control module determines that the power regulation gear value received by the first regulation module is greater than Then increase the power regulation value of the second regulation module by a regulation reference value l, and subtract the regulation gear value of the first regulation module by

[0070] The control module determines that the power regulation gear value received by the first regulation module is less than 0, then increase the power regulation value of the second regulation module by a regulation reference value l, and increase the regulation gear value of the first regulation module by

[0071] If the remaining adjustable value is negative, then output the adjustment values of the first regulation module and the second regulation module according to the upper and lower limits.

[0072] In this embodiment, the regulation range of the first regulation module is 3 dB, the regulation gear precision is 0.05 dB, and the corresponding regulation range is 0 - 60.

[0073] If the control module 10 determines that the power regulation gear value received by the first regulation module 40 is greater than 60, it subtracts 40 from the power regulation gear value, and the power regulation value of the second regulation module 50 increases by 2 dB.

[0074] If the control module 10 determines that the power regulation gear value received by the first regulation module 40 is less than 0, it adds 40 to the power regulation gear value, and the power regulation value of the second regulation module 50 decreases by 2 dB.

[0075] In this embodiment, the power adjustment range of 0 - (-100) dB is mapped to a total of 2000 items in the power gear mapping table. In this embodiment, the adjustment range of the first regulation module 40 is 3 dB (±1.5 dB), and there is only a total scale gear range of 60. Therefore, we preset a complete power gear mapping table with 2000 items in the control module 10, and by moving the look-up table according to the regulation reference value as the rom base address, the 100 dB regulation range can be covered, as shown in the following table:

[0076]

[0077] In some embodiments, it further includes, after allocating the power regulation value according to the first preset rule, calculating and obtaining the remaining adjustable values of the first regulation module 40 and the second regulation module 50 in combination with the upper and lower limits of the first regulation module 40 and the second regulation module 50, and judging the positivity and negativity of the remaining adjustable values. If the remaining adjustable gear value is positive, the first regulation module 40 is adjusted to the range of 0 - 60 and then the adjustment value of the second regulation module 50 is recalculated; if the remaining adjustable value is negative, the adjustment values of the first regulation module 40 and the second regulation module 50 are output according to the upper and lower limits.

[0078] Specifically, for example, currently a total of 29 dB needs to be adjusted. The second regulation module 50 has already been adjusted by 28 dB and can still be adjusted by 2 dB. The remaining adjustable gear value is positive. The first regulation module 40 can still be adjusted by 3 dB (±1.5 dB). At this time, the power gear value of the first regulation module 40 is 65 (>60). Therefore, the control module 10 adjusts the power regulation gear value of the first regulation module 40 by (-40), and the power regulation value of the second regulation module 50 is adjusted by 2 dB to 30 dB, and then the first regulation module 40 is adjusted by (-1 dB) to get 29 dB.

[0079] In some embodiments, the power monitoring module 20 includes a sampling module. The power monitoring module 20 obtains the current power value of the output signal, and further includes: the sampling module samples the output signal to obtain a sampling value, and the power monitoring module 20 calculates the mean square value of the sampling value to obtain the current power value.

[0080] Specifically, in this embodiment, for a segment of output signal, the average of the squared values of its ADC sampling values is calculated, that is, the instantaneous power of the output signal is averaged over a given time. For a simple output signal, only simple summation and division operations are involved; for a specific number of accumulations of powers of 2, division can also be replaced by shift operations, reducing the computational complexity relatively, improving the computational speed while reducing the occupation of on-chip computing resources and enhancing the overall performance of the test system.

[0081] In this embodiment, the output signal is a simple single-tone signal, and there is no need to analyze its time-frequency characteristics. Using the above-mentioned time-domain averaging algorithm can achieve the required computational accuracy.

[0082] In this embodiment, the sampling values of the sampling module are quantized into 16-bit signed numbers, and its theoretical range is ±32768. To limit the input power within a safe range and at the same time reduce the variable bit width required for power calculation, ±8192 is taken as its maximum input gear range. Therefore, only a 24-bit variable is needed to represent the current power value without exceeding the limit. The power monitoring module 20 calculates the current power value according to the input gear value of the sampling module, calculates the corresponding power regulation gear value every 0.1 dB, determines which gear of the power gear mapping table it is in, and then combines the target power value to achieve a regulation accuracy of 0.1 dB.

[0083] In some embodiments, the power monitoring module 20 includes a frequency-domain conversion module. The power monitoring module 20 obtains the current power value of the output signal, and further includes: the frequency-domain conversion module performs a discrete Fourier transform or a fast Fourier transform on the output signal to obtain a first spectrum, and the power monitoring module 20 calculates the sum of squares of the frequency components of the first spectrum to obtain the current power value.

[0084] Specifically, in this embodiment, the output signal is first converted from the time domain to the frequency domain to obtain the spectrum of the output signal. According to the type of the output signal, for example, for a discrete signal, a frequency-domain representation is obtained through a discrete Fourier transform (DFT) or a fast Fourier transform (FFT); for a continuous signal, a frequency-domain representation is obtained through a Fourier transform (FT).

[0085] In this embodiment, according to Parseval's theorem, the average power of the output signal can be obtained by calculating the sum of the squares of the modulus values of the frequency components in the frequency domain.

[0086] Figure 5 It is a flowchart of a method provided by another embodiment of the first aspect of the present invention.

[0087] As Figure 5 shown, in some embodiments, before the first regulation module 40 and the second regulation module 50 regulate the power of the output signal according to the power regulation value to reach the target power value, it further includes:

[0088] Step S41, determine whether the current power value reaches the target power value. If it reaches, jump out of the power control loop;

[0089] Step S42, if not, when the loop control count is less than the maximum loop count, calculate and obtain the power regulation value;

[0090] Step S43, determine whether the magnitude of the power regulation value exceeds the upper and lower limits of the first regulation module 40 and the second regulation module 50. If so, jump out of the power control loop; if not, send it to the first power regulation module 40 and the second regulation module 50 for power regulation, and the loop control count i = 1; when the loop control count is equal to the maximum loop count, jump out of the power control loop.

[0091] In some embodiments, the maximum loop count is q. In this embodiment, the maximum loop count is taken as 8. Its main time consumption lies in the selection of the gate length for calculating the time-domain average power and the serial port data sending time. The total time required is (12.8 + 14)×8 = 214.4 us, ensuring that the power servo delay is within a certain range.

[0092] In this embodiment, through the collaborative control of the first regulation module 40 and the second regulation module 50, combined with the dynamic reference value adjustment and 18-bit quantization mapping table technology, 0.1-level high-precision power regulation is achieved. The system adopts a regulation reference value allocation strategy and a redundant gear-shifting mechanism, supports 100dB wide dynamic range regulation, and can adaptively calculate the power value in both time domain and frequency domain dual modes to balance the requirements of speed and precision. It breaks through the dependence of traditional systems on special hardware, has low servo delay, and has high precision, strong anti-interference ability and wide compatibility, and can be applied to scenarios such as 5G base stations and satellite communications that require precise power control.

[0093] In a second aspect, the present application also provides a vector signal transceiver, including a vector signal generator 1, an analog front end 2, and a vector signal analyzer 3. The vector signal generator 1 includes a first debugging module 40, the analog front end 2 includes a second debugging module 50, and the vector signal analyzer 3 includes a power monitoring module 20, a logic calculation module 30, and a control module 10, which are used to perform high-precision servo on the signal power by using a high-precision power servo method of any of the foregoing embodiments during the signal generation stage and the signal link stage of the vector signal transceiver.

[0094] Among them, the vector signal generator 1, the analog front end 2, and the vector signal analyzer 3 are PXIe measurement instrument boards, and the number of each type of board can be one or more.

[0095] The PXIe vector signal transceiver provided in this embodiment has high-precision power servo, high servo efficiency, and good linearity.

[0096] In a third aspect, the present application further provides a computer-readable medium, on which a computer program is stored, and when the computer program is executed, it can implement a high-precision power servo method for a vector signal transceiver according to any one of the foregoing embodiments.

[0097] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision power servo method, characterized in that, For a vector signal transceiver to perform power servo on a signal, the vector signal transceiver includes a vector signal generator and a vector signal analyzer. The vector signal generator includes a first debugging module, and the vector signal analyzer includes a power monitoring module, a logic calculation module, and a control module. The vector signal generator generates an input signal to a device under test, and the device under test outputs a measured signal to the vector signal analyzer. The vector signal transceiver performs power servo during both the signal generation stage and the signal link stage. The method includes the following steps: The power monitoring module obtains the current power value of the output signal and sends the current power value to the control module; The control module pre-configures control parameters, and the control parameters include a target power value; The control module determines whether the current power value is the same as the target power value. If not, it sends the current power value and the target power value to the logic calculation module; The logic calculation module calculates a power regulation value based on the current power value and the target power value and sends the power regulation value to the first regulation module; The first regulation module regulates the power of the output signal according to the power regulation value to reach the target power value.

2. The high-precision power servo method according to claim 1, characterized in that Before the first regulation module regulates the power of the output signal according to the power regulation value to reach the target power value, it further includes: The control parameters further include a reference power value. The control module selects a suitable reference power value according to the target power value and sends the reference power value to the first regulation module; The first regulation module regulates the power of the output signal according to the reference power value to approach the target power value.

3. The high-precision power servo method according to claim 2, wherein The vector signal transceiver further includes an analog front end. The analog front end includes a second regulation module. The control module distributes the power regulation value to the first regulation module and the second regulation module according to a first preset rule. The second regulation module coarsely adjusts the power regulation value with a second preset step size, and the first regulation module finely adjusts the power regulation value with a first preset step size to reach the target power value; The second preset step size is greater than the first preset step size.

4. The high-precision power servo method according to claim 3, characterized in that, The control parameters further include a regulation reference value l, and the regulation reference value l is an integer multiple of the first preset step size. The first preset rule includes: judging the magnitude of the power adjustment value and the regulation reference value l. The part of the power adjustment value that exceeds the regulation reference value l is sent to the second regulation module, and the second regulation module regulates one regulation reference value l each time. The part of the power regulation value that does not exceed the regulation reference value l is sent to the first regulation module.

5. The high-precision power servo method according to claim 4, characterized in that, The control parameters further include a preset reference power range and a bit width parameter. A power gear mapping table is pre-set in the control module, and the power gear mapping table is obtained by multiplying the preset reference power range by the bit width parameter. The control module multiplies the power regulation value by the bit width parameter to obtain a power regulation gear value.

6. The high-precision power servo method according to claim 5, characterized in that The control parameters further include the upper and lower limits of the first regulation module and the second regulation module. The regulation range of the first regulation module is m, the regulation gear accuracy of the first regulation module is n, and the corresponding regulation gear is It further includes a shifting method: After allocating the power adjustment value according to the first preset rule, calculate the remaining adjustable values of the first control module and the second control module in combination with the upper and lower limits of the first control module and the second control module, and judge the positivity and negativity of the remaining adjustable values. If the remaining adjustable gear value is positive, then The control module determines that the power regulation gear value received by the first regulation module is greater than then increase the power regulation value of the second regulation module by one regulation reference value l, and subtract the regulation gear value of the first regulation module by If the control module determines that the power regulation gear value received by the first regulation module is less than 0, the power regulation value of the second regulation module is increased by one regulation reference value l, and the regulation gear value of the first regulation module is increased If the remaining adjustable value is negative, output the adjustment values of the first control module and the second control module according to the upper and lower limit values.

7. The high-precision power servo method according to claim 6, characterized in that Before the first control module and the second control module adjust the power of the output signal according to the power control value to reach the target power value, it further includes: Judge whether the current power value reaches the target power value. If it reaches, jump out of the power control loop; If it does not reach, when the loop control times is less than the maximum loop times, calculate and obtain the power control value; Judge whether the magnitude of the power control value exceeds the upper and lower limit values of the first control module and the second control module. If so, jump out of the power control loop; if not, send it to the first control module and the second control module for power control, and the loop control times i = 1; when the loop control times is equal to the maximum loop times, jump out of the power control loop; The maximum loop times is q.

8. The high-precision power servo method according to claim 1, wherein The power monitoring module includes a sampling module. The power monitoring module obtains the current power value of the output signal. It further includes: the sampling module samples the output signal to obtain a sampling value, and the power monitoring module calculates the mean square value of the sampling value to obtain the current power value.

9. The high-precision power servo method according to claim 1, wherein The power monitoring module includes a frequency domain conversion module. The power monitoring module obtains the current power value of the output signal. It further includes: the frequency domain conversion module performs discrete Fourier transform or fast Fourier transform on the output signal to obtain a first frequency spectrum, and the power monitoring module calculates the sum of squares of the frequency components of the first frequency spectrum to obtain the current power value.

10. A vector signal transceiver, characterized in that, It includes a vector signal generator, an analog front end and a vector signal analyzer. The vector signal generator includes a first debugging module, the analog front end includes a second debugging module, and the vector signal analyzer includes a power monitoring module, a logic calculation module and a control module, which are used for the vector signal transceiver to perform high-precision servo on the power of the signal in the signal generation stage and the signal link stage by using any one of the methods recited in claims 1 to 9.

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