Broadband three-dimensional stacked SiP frequency source internal calibration circuit and method

Abstract

The invention provides a broadband three-dimensional stacked SiP frequency source internal calibration circuit and method, the circuit comprises a SiP frequency source module, and a test tool module is adopted to calibrate the SiP frequency source module; the SiP frequency source module comprises a miniaturized control unit, a broadband frequency synthesis circuit, a numerical control attenuator and an amplifier. The test tool module comprises a power measuring instrument and a computer control unit. The internal calibration method is used for calibrating the attenuation in the numerical control attenuator based on the circuit. The calibrated broadband three-dimensional stacked SiP frequency source obtains an attenuation code corresponding to the output frequency from the memory in the on-machine working process, controls the attenuator to realize output power adjustment, and keeps the power consistency of broadband output. According to the broadband three-dimensional stacked SiP frequency source, the problem of large output power fluctuation of the broadband three-dimensional stacked SiP frequency source can be well solved, and compared with analog leveling means such as using an equalizer and increasing transition matching, the broadband three-dimensional stacked SiP frequency source adopts a very simple digital-analog hybrid scheme, and is better in calibration effect and easy to miniaturize and integrate.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency microwave power calibration, and in particular to a broadband three-dimensional stacked SiP frequency source internal calibration circuit and method. Background Art

[0002] As the signal source of various electronic systems, the consistency of the output signal amplitude of the frequency source affects the system performance. This problem is particularly evident in broadband microwave electronic systems. With the rapid development of technology, the system has put forward higher requirements on the broadband output power fluctuation of the frequency source. On the other hand, with the development of system-level packaging, the three-dimensional stacking architecture has become an advanced design method for miniaturization and high integration of frequency sources in the RF microwave field. The frequency source designed and implemented using SiP (System in Package) packaging technology has great advantages in miniaturization and lightweight. SiP three-dimensional stacking architecture such as Figure 1 shown.

[0003] In the miniaturized broadband frequency source realized by the three-dimensional stacked SiP architecture, there will be amplitude consistency problems caused by vertical transition between upper and lower layers of broadband RF signals, multiple channels, and manufacturing process precision, which will directly affect the amplitude consistency of the broadband frequency source output signal. Using three-dimensional electromagnetic simulation to optimize circuit layout / wiring, add equalizers, increase transition matching design, and push amplifier saturation can improve signal amplitude consistency, but the amplitude control capability is limited, especially in the case of non-monotonic broadband amplitude-frequency response, traditional means such as equalization have limited effectiveness.

[0004] The study found that the amplitude consistency problem of the frequency source output signal can be calibrated when the system is applied. However, with the development trend of miniaturization and high integration of microwave systems, the frequency source as the signal source is urgently needed to have an internal calibration function to avoid the problem of difficulty in calibration after the accumulation of amplitude imbalance between multi-functional modules in the system, which can effectively save system control resources. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, a first aspect of the present invention provides a broadband three-dimensional stacked SiP frequency source internal calibration circuit.

[0007] A second aspect of the present invention provides a broadband three-dimensional stacked SiP frequency source internal calibration method.

[0008] The present invention provides a broadband three-dimensional stacked SiP frequency source internal calibration circuit, comprising a SiP frequency source module, and a test fixture module is used to calibrate the SiP frequency source module;

[0009] The SiP frequency source module includes:

[0010] A miniaturized control unit, which is used to receive input information from an external circuit and has a storage function, and generates a control command according to the input information from the external circuit, wherein the control command includes a frequency control signal and an attenuation code control signal;

[0011] A broadband frequency synthesis circuit, connected to the miniaturized control unit, for synthesizing a baseband signal and a spread spectrum signal according to a frequency control signal;

[0012] A digitally controlled attenuator, connected to the miniaturized control unit and the broadband frequency synthesis circuit, respectively, for attenuating the baseband signal or the spread spectrum signal according to the attenuation code control signal to form an attenuated signal;

[0013] an amplifier, connected to the digitally controlled attenuator, for amplifying the attenuated signal and forming an output frequency signal;

[0014] The test fixture module comprises:

[0015] A power measuring instrument, connected to the amplifier, for detecting the power value corresponding to any frequency point of the output frequency signal;

[0016] A computer control unit connected to the power measuring instrument for acquiring the collected data of the power measuring instrument; the computer control unit is also connected to a miniaturized control unit for sending a frequency control code and calibrating an attenuation code table according to the collected data;

[0017] The computer control unit calibrates the attenuation code table according to the collected data, the calibrated attenuation code table is stored in the miniaturized control unit, and the miniaturized control unit generates an attenuation code control signal according to the attenuation code table.

[0018] The broadband three-dimensional stacked SiP frequency source internal calibration circuit according to the above technical solution of the present invention may also have the following additional technical features:

[0019] In the above technical solution, the miniaturized control unit includes a control subunit and a storage subunit, the storage subunit is used to store external circuit input information, and the control subunit is used to generate a control command according to the external circuit input information;

[0020] The control subunit and the storage subunit are independent devices; or, the control subunit and the storage subunit are integrated devices.

[0021] In the above technical solution, the maximum attenuation of the digitally controlled attenuator is greater than the maximum fluctuation of the output signal power of the broadband frequency synthesis circuit.

[0022] The present invention provides a broadband three-dimensional stacked SiP frequency source internal calibration method, which uses an internal calibration circuit as described in any one of the above technical solutions to calibrate the broadband three-dimensional stacked SiP frequency source, and the method includes:

[0023] S1. Set the attenuation of the digital controlled attenuator in the full frequency band to the maximum value, use the computer control unit to control the output frequency of each frequency point of the SiP frequency source, and use the power measuring instrument to collect the power value corresponding to each frequency point;

[0024] S2. Setting the calibration times, and using the computer control unit to assign values ​​and make numerical judgments on the calibration times;

[0025] S3. When the number of calibration times is equal to 1, the computer control unit calculates the pre-attenuation code of the current frequency point according to the maximum attenuation of the digitally controlled attenuator, the power target value and the measured frequency power value, configures the attenuation of the digitally controlled attenuator according to the calculated pre-attenuation code, and uses the power measuring instrument to re-collect the frequency power value corresponding to the current frequency point, and determines whether the degree of deviation of the frequency power value from the power target value meets the threshold requirement. If it meets the threshold requirement, the current attenuation of the frequency point is used as the attenuation after calibration;

[0026] S4. When the degree to which the frequency power value deviates from the power target value does not meet the threshold requirement, the count value of the number of calibrations is increased by 1, and it is determined whether the current frequency power value is greater than the power target value. According to different judgment results, the attenuation value used in the last calibration, the power target value, and the frequency power value collected in the last calibration are used to calculate the attenuation code of the frequency. According to the calculated attenuation code, the attenuation value of the digital attenuator is configured, and the frequency power value corresponding to the current frequency is recollected using the power measuring instrument. It is determined whether the degree to which the frequency power value deviates from the power target value meets the threshold requirement. If it meets the threshold requirement, the current attenuation value of the frequency is used as the attenuation value after calibration. If it does not meet the threshold requirement, the above process is repeated until the measured frequency power value meets the threshold requirement.

[0027] S5. After all frequency points are calibrated, an attenuation code table is formed according to the calibrated attenuation values ​​of all frequency points, and the attenuation code table is saved in the miniaturized control unit.

[0028] In the above technical solution, the power target value is between the minimum power value of all frequency points when the attenuation of the digital controlled attenuator is 0 and the maximum power value of all frequency points when the attenuation of the digital controlled attenuator is the maximum attenuation.

[0029] In the above technical solution, step S1 includes:

[0030] S11, setting the attenuation of the digital controlled attenuator in the full frequency band to a maximum value M, and writing it into the miniaturized control unit;

[0031] S12, setting a frequency point variable x; wherein the initial value of the frequency point variable x is 0;

[0032] S13, add 1 to the frequency variable x count and assign it to x, overwriting the previous value of x, that is, x=x+1;

[0033] S14, the computer control unit sends a frequency code for controlling the output frequency of the SiP frequency source module to the miniaturized control unit, and the miniaturized control unit generates a frequency control signal according to the frequency code to control the output frequency of the broadband frequency synthesis circuit at the current frequency point;

[0034] S15, using a power measuring instrument to collect the power value corresponding to the current frequency point output by the SiP frequency source module;

[0035] S16. Determine whether the frequency variable x is less than the total number of frequency points, that is, determine whether the measurement of the power values ​​of all frequency points under the maximum attenuation value is completed; if it is less than, return to step S13; otherwise, execute step S2.

[0036] In the above technical solution, step S2 includes:

[0037] S21, initialize the frequency point variable x, even if x is equal to 0;

[0038] S22, the frequency point variable x count is increased by 1, and the value is assigned to x, covering the previous value of x, that is, x=x+1;

[0039] S23, the computer control unit sends a frequency code for controlling the output frequency of the SiP frequency source module to the miniaturized control unit, and the miniaturized control unit generates a frequency control signal according to the frequency code to control the output frequency of the broadband frequency synthesis circuit at the current frequency point;

[0040] S24, setting the calibration times variable n, the initial value of which is 0;

[0041] S25, adding 1 to the calibration times variable n, and assigning the value to n, overwriting the previous value of n, that is, n=n+1;

[0042] S26. Determine whether n is equal to 1. If n is equal to 1, execute step S3; if n is greater than 1, execute step S4.

[0043] In the above technical solution, step S3 includes:

[0044] S31, calculating the pre-attenuation code of the current frequency point, including:

[0045] a fx1 =M-(P0-P fx_M )

[0046] Among them, a fx1represents the pre-attenuation code of the current frequency point x, M represents the maximum attenuation of the digital attenuator, P0 represents the power target value, P fx_M It indicates the frequency power value of the xth frequency point measured when the attenuation of the digital controlled attenuator is M;

[0047] S32, according to the calculated pre-attenuation code, the attenuation of the digital controlled attenuator is configured to be a fx1 ;

[0048] S33, using a power measuring instrument to re-collect the frequency power value corresponding to the current frequency;

[0049] S34, judging whether the degree to which the frequency power value deviates from the power target value meets the threshold requirement, including:

[0050]

[0051] in, Indicates the attenuation of the digital controlled attenuator is The frequency power value of the xth frequency point measured at , s represents the set threshold;

[0052] When the power value of the frequency point deviates from the power target value to the extent that it meets the threshold requirement, the current attenuation of the frequency point is as the attenuation after calibration; if it does not meet the threshold requirement, return to step S25 and re-calibrate.

[0053] In the above technical solution, step S4 includes:

[0054] S41, judging whether the power value of the current frequency point is greater than the power target value, including:

[0055]

[0056] in, Indicates the frequency power value of frequency point x after the n-1th calibration;

[0057] S42: When the frequency power value is greater than or equal to the power target value, the attenuation code of the frequency is calculated, including:

[0058]

[0059] S43, when the frequency power value is less than the power target value, the attenuation code of the frequency is calculated, including:

[0060]

[0061] in, Indicates the attenuation code of frequency point x at the nth calibration; Indicates the attenuation code of frequency point x at the n-1th calibration;

[0062] S44, the attenuation of the digital controlled attenuator is configured according to the calculated attenuation code:

[0063] S45, using a power measuring instrument to re-collect the frequency power value corresponding to the current frequency;

[0064] S46, judging whether the degree to which the frequency power value deviates from the power target value meets the threshold requirement, including:

[0065]

[0066] in, Indicates the attenuation of the digital controlled attenuator is The frequency power value of the xth frequency point measured at the time is the frequency power value after the nth calibration;

[0067] When the power value of the frequency point deviates from the power target value to the extent that it meets the threshold requirement, the current attenuation of the frequency point is as the attenuation after calibration; if it does not meet the threshold requirement, return to step S25 and re-calibrate.

[0068] In the above technical solution, step S5 includes:

[0069] After all frequency points are calibrated, an attenuation code table is formed according to the calibrated attenuation of all frequency points, and the attenuation code table is saved in the miniaturized control unit to complete the calibration; during the operation of the calibrated broadband three-dimensional stacked SiP frequency source on the machine, the attenuation code corresponding to the output frequency is obtained from the miniaturized control unit to control the CNC attenuator to achieve output power adjustment.

[0070] In summary, due to the adoption of the above technical features, the beneficial effects of the present invention are:

[0071] In view of the problem of large power fluctuation of the output signal of the current broadband three-dimensional stacked SiP frequency source, the present invention provides a broadband three-dimensional stacked SiP frequency source internal calibration circuit and method, which can effectively improve the amplitude consistency of the output signal of the broadband three-dimensional stacked SiP frequency source. Specifically, the present invention can better solve the problem of large output power fluctuation of the broadband three-dimensional stacked SiP frequency source, and the theoretical calibration accuracy reaches 1 / 2 of the accuracy of the digital attenuator. Compared with analog leveling methods such as using an equalizer and increasing transition matching, the present invention adopts a minimalist digital-analog hybrid solution, which has better calibration effect and is easy to miniaturize and integrate.

[0072] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0074] Figure 1 This is a schematic diagram of the three-dimensional stacking architecture of the SiP frequency source;

[0075] Figure 2 1 is a circuit schematic diagram of a broadband three-dimensional stacked SiP frequency source internal calibration circuit according to an embodiment of the present invention;

[0076] Figure 3 It is a flow chart of a broadband three-dimensional stacked SiP frequency source internal calibration method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0077] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0078] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0079] Refer to the following Figures 1 to 3 The broadband three-dimensional stacked SiP frequency source in-source calibration circuit and method provided according to some embodiments of the present invention are described.

[0080] Some embodiments of the present application provide a broadband three-dimensional stacked SiP frequency source internal calibration circuit.

[0081] The first embodiment of the present invention proposes a broadband three-dimensional stacked SiP frequency source internal calibration circuit, the circuit structure can be adopted as follows Figure 1 The circuit structure shown adopts a three-dimensional stacking architecture, in which the RF signal has a vertical transition; it has the characteristics of being small in size and conforming to the SiP packaging standards published in the RF microwave industry.

[0082] Specifically, Figure 2 As shown, the internal calibration circuit includes a SiP frequency source module, and the SiP frequency source module is calibrated by a test fixture module; the SiP frequency source module includes a miniaturized control unit, a broadband frequency synthesis circuit, a digitally controlled attenuator and an amplifier. The test fixture module includes a power measuring instrument and a computer control unit.

[0083] A miniaturized control unit is used to receive external circuit input information and has a storage function, and generates a control command according to the external circuit input information, wherein the control command includes a frequency control signal and an attenuation code control signal.

[0084] Specifically, the miniaturized control unit mainly includes control and storage functional parts. The control and storage can be integrated together to realize the control unit function, or they can be independent devices connected together in a certain way to jointly realize the miniaturized control unit function.

[0085] In a specific embodiment, the miniaturized control unit includes a control subunit and a storage subunit, wherein the storage subunit is used to store external circuit input information, and the control subunit is used to generate a control command according to the external circuit input information; wherein the control subunit and the storage subunit can be independent devices or integrated devices. The use of integrated devices can improve the miniaturization and integration of the entire circuit.

[0086] With the above arrangement, the miniaturized control unit can receive and process the input information of the external circuit according to the control protocol to issue the control command, and has the storage function that the stored information is not cleared after the system loses power.

[0087] The broadband frequency synthesis circuit is connected to the miniaturized control unit and is used to synthesize the baseband signal and the spread spectrum signal according to the frequency control signal. Specifically, the output signal of the broadband frequency synthesis circuit is a broadband signal, which generally includes the synthesis of the baseband signal and the spread spectrum signal. The spread spectrum signal can be a frequency division signal, a frequency multiplication signal, or both signals, and is mainly used to output the corresponding frequency according to the frequency control signal issued by the miniaturized control unit.

[0088] The digitally controlled attenuator is connected to the miniaturized control unit and the broadband frequency synthesis circuit, respectively, and is used to attenuate the baseband signal or the spread spectrum signal according to the attenuation code control signal to form an attenuation signal. Specifically, the digitally controlled attenuator can make corresponding attenuation on the power of the radio frequency signal (the output signal of the broadband frequency synthesis circuit) according to the attenuation code control signal. Its applicable frequency should cover the output frequency of the broadband frequency synthesis circuit. Preferably, the maximum attenuation of the digitally controlled attenuator should be greater than the maximum fluctuation of the output signal power of the broadband frequency synthesis circuit.

[0089] The amplifier is connected to the digitally controlled attenuator and is used to amplify the attenuated signal and form an output frequency signal; its applicable frequency covers the output frequency of the broadband frequency synthesis circuit.

[0090] The power measuring instrument is connected to the amplifier and is used to detect the power value corresponding to any frequency point of the output frequency signal; its start and stop can be controlled by the computer control unit.

[0091] A computer control unit is connected to the power measuring instrument and is used to obtain the collected data of the power measuring instrument; the computer control unit is also connected to the miniaturized control unit and is used to send a frequency control code and calibrate the attenuation code table according to the collected data. The computer control unit calibrates the attenuation code table according to the collected data, and the calibrated attenuation code table is stored in the miniaturized control unit. The miniaturized control unit can generate an attenuation code control signal according to the calibrated attenuation code table.

[0092] A second embodiment of the present invention proposes a broadband three-dimensional stacked SiP frequency source internal calibration method, which uses an internal calibration circuit as described in any of the above embodiments to calibrate the broadband three-dimensional stacked SiP frequency source, and the method includes steps S1-S5.

[0093] S1. Set the attenuation of the digital controlled attenuator in the whole frequency band to the maximum value, use the computer control unit to control the output frequency of each frequency point of the SiP frequency source, and use the power measuring instrument to collect the power value corresponding to each frequency point.

[0094] S2. Set the calibration times, and use the computer control unit to assign values ​​and make numerical judgments on the calibration times.

[0095] S3. When the number of calibration times is equal to 1, the computer control unit calculates the pre-attenuation code of the current frequency point according to the maximum attenuation of the digitally controlled attenuator, the power target value and the measured frequency power value, configures the attenuation of the digitally controlled attenuator according to the calculated pre-attenuation code, and uses the power measuring instrument to re-collect the frequency power value corresponding to the current frequency point, and determines whether the degree to which the frequency power value deviates from the power target value meets the threshold requirement. If it meets the threshold requirement, the current attenuation of the frequency point is used as the attenuation after calibration.

[0096] S4. When the degree to which the frequency power value deviates from the power target value does not meet the threshold requirement, the count value of the number of calibrations is increased by 1, and it is determined whether the current frequency power value is greater than the power target value. According to different judgment results, the attenuation code of the frequency is calculated using the attenuation used in the last calibration, the power target value, and the frequency power value collected in the last calibration. The attenuation of the CNC attenuator is configured according to the calculated attenuation code, and the frequency power value corresponding to the current frequency is recollected using the power measuring instrument. It is determined whether the degree to which the frequency power value deviates from the power target value meets the threshold requirement. If it meets the threshold requirement, the current attenuation of the frequency is used as the attenuation after calibration. If it does not meet the threshold requirement, the above process is repeated until the measured frequency power value meets the threshold requirement.

[0097] S5. After all frequency points are calibrated, an attenuation code table is formed according to the calibrated attenuation values ​​of all frequency points, and the attenuation code table is saved in the miniaturized control unit.

[0098] In some embodiments, the power target value is between the minimum power value of all frequency points when the attenuation of the digitally controlled attenuator is 0 and the maximum power value of all frequency points when the attenuation of the digitally controlled attenuator is the maximum attenuation.

[0099] In a specific embodiment, according to Figure 2 After the circuit shown in the figure constructs a broadband three-dimensional stacked SiP frequency source internal calibration circuit, Figure 3 As shown, the calibration process mainly includes the following contents, wherein step S1 is decomposed into steps S11-S16; step S2 is decomposed into steps S21-S26; step S3 is decomposed into steps S31-S34; step S4 is decomposed into steps S41-S46.

[0100] S11, setting the attenuation of the digital controlled attenuator in the full frequency band to a maximum value M, and writing it into the miniaturized control unit.

[0101] S12. Set a frequency point variable x; wherein x is a natural number, and the initial value of the frequency point variable x is 0.

[0102] S13, add 1 to the frequency point variable x count and assign it to x, overwriting the previous value of x, that is, x=x+1.

[0103] S14, the computer control unit sends a frequency code to the miniaturized control unit to control the output frequency of the SiP frequency source module, and the miniaturized control unit generates a frequency control signal according to the frequency code to control the output frequency f of the broadband frequency synthesis circuit at the current frequency point x .

[0104] S15. Use a power measuring instrument to collect the power value P corresponding to the current frequency point output by the SiP frequency source module. fx_M .

[0105] S16. The computer control unit determines whether the frequency variable x is less than the total number of frequency points, that is, determines whether the measurement of the power values ​​of all frequency points under the maximum attenuation value is completed; if it is less than, return to step S13; otherwise, enter step S21.

[0106] S21. Initialize the frequency point variable x, even if x is equal to 0.

[0107] S22. The frequency point variable x counts up by 1 and is assigned to x, overwriting the previous value of x, that is, x=x+1.

[0108] S23, the computer control unit sends a frequency code to the miniaturized control unit to control the output frequency of the SiP frequency source module, and the miniaturized control unit generates a frequency control signal according to the frequency code to control the output frequency f of the broadband frequency synthesis circuit at the current frequency point x .

[0109] S24. Set the calibration times variable n, where n is a natural number and its initial value is 0.

[0110] S25. Add 1 to the calibration times variable n and assign the value to n, overwriting the previous value of n, that is, n=n+1.

[0111] S26. The computer control unit determines whether n is equal to 1. If n is equal to 1, the process proceeds to step S31; if n is greater than 1, the process proceeds to step S41.

[0112] S31, calculating the pre-attenuation code of the current frequency point, including:

[0113]

[0114] in, Indicates the pre-attenuation code of the current frequency point x, M indicates the maximum attenuation of the digital attenuator, P0 indicates the power target value, It indicates the frequency power value of the xth frequency point measured when the attenuation of the digital attenuator is M.

[0115] S32, the attenuation of the digital controlled attenuator is configured according to the calculated pre-attenuation code:

[0116] S33. Use the power measuring instrument to re-collect the frequency power value corresponding to the current frequency.

[0117] S34, judging whether the degree to which the frequency power value deviates from the power target value meets the threshold requirement, including:

[0118]

[0119] in, Indicates the attenuation of the digital controlled attenuator is The frequency power value of the xth frequency point measured at the time t, s represents the set threshold. Specifically, the set threshold s can be the minimum step of the attenuation amount of the digital controlled attenuator.

[0120] When the power value of the frequency point deviates from the power target value to the extent that it meets the threshold requirement, the current attenuation of the frequency point is as the attenuation after calibration; if it does not meet the threshold requirement, return to step S25 and re-calibrate.

[0121] S41, judging whether the power value of the current frequency point is greater than the power target value, including:

[0122]

[0123] in, Indicates the frequency power value of frequency point x after the n-1th calibration. Step S42 or step S43 is executed according to the judgment result.

[0124] S42: When the frequency power value is greater than or equal to the power target value, the attenuation code of the frequency is calculated, including:

[0125]

[0126] S43, when the frequency power value is less than the power target value, the attenuation code of the frequency is calculated, including:

[0127]

[0128] in, Indicates the attenuation code of frequency point x at the nth calibration; Indicates the attenuation code of frequency point x during the n-1th calibration.

[0129] S44, the attenuation of the digital controlled attenuator is configured according to the calculated attenuation code:

[0130] S45. Use the power measuring instrument to re-collect the frequency power value corresponding to the current frequency.

[0131] S46, judging whether the degree to which the frequency power value deviates from the power target value meets the threshold requirement, including:

[0132]

[0133] in, Indicates the attenuation of the digital controlled attenuator is The frequency power value of the xth frequency point measured at the time is the frequency power value after the nth calibration.

[0134] When the power value of the frequency point deviates from the power target value to the extent that it meets the threshold requirement, the current attenuation of the frequency point is as the attenuation after calibration; if it does not meet the threshold requirement, return to step S25 and re-calibrate.

[0135] S5. After all frequency points are calibrated, an attenuation code table is formed according to the calibrated attenuation of all frequency points, and the attenuation code table is saved in the miniaturized control unit to complete the calibration; during the operation of the calibrated broadband three-dimensional stacked SiP frequency source on the machine, the attenuation code corresponding to the output frequency is obtained from the miniaturized control unit to control the digitally controlled attenuator to achieve output power adjustment.

[0136] In a specific embodiment, the above method is used to perform power calibration of a 0.2 GHz to 20 GHz broadband three-dimensional stacked SiP frequency source, so that the output power fluctuation of the SiP frequency source in the full frequency band is within ±1dB, meeting the system application requirements.

[0137] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0138] Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A broadband three-dimensional stacked SiP frequency source internal calibration circuit, characterized in that: It includes a SiP frequency source module, and a test fixture module is used to calibrate the SiP frequency source module; The SiP frequency source module includes: A miniaturized control unit, which is used to receive input information from an external circuit and has a storage function, and generates a control command according to the input information from the external circuit, wherein the control command includes a frequency control signal and an attenuation code control signal; A broadband frequency synthesis circuit, connected to the miniaturized control unit, for synthesizing a baseband signal and a spread spectrum signal according to a frequency control signal; A digitally controlled attenuator, connected to the miniaturized control unit and the broadband frequency synthesis circuit, respectively, for attenuating the baseband signal or the spread spectrum signal according to the attenuation code control signal to form an attenuated signal; an amplifier, connected to the digitally controlled attenuator, for amplifying the attenuated signal and forming an output frequency signal; The test fixture module comprises: A power measuring instrument, connected to the amplifier, for detecting the power value corresponding to any frequency point of the output frequency signal; A computer control unit connected to the power measuring instrument for acquiring the collected data of the power measuring instrument; the computer control unit is also connected to a miniaturized control unit for sending a frequency control code and calibrating an attenuation code table according to the collected data; The computer control unit calibrates the attenuation code table according to the collected data, the calibrated attenuation code table is stored in the miniaturized control unit, and the miniaturized control unit generates an attenuation code control signal according to the attenuation code table.

2. The broadband three-dimensional stacked SiP frequency source internal calibration circuit according to claim 1, characterized in that: The miniaturized control unit comprises a control subunit and a storage subunit, wherein the storage subunit is used to store external circuit input information, and the control subunit is used to generate a control command according to the external circuit input information; The control subunit and the storage subunit are independent devices; or, the control subunit and the storage subunit are integrated devices.

3. The broadband three-dimensional stacked SiP frequency source internal calibration circuit according to claim 1, characterized in that: The maximum attenuation of the digitally controlled attenuator is greater than the maximum fluctuation of the output signal power of the broadband frequency synthesis circuit.

4. A broadband three-dimensional stacked SiP frequency source internal calibration method, characterized in that: The method of calibrating a broadband three-dimensional stacked SiP frequency source by using an internal calibration circuit as claimed in any one of claims 1 to 3 comprises: S1. Set the attenuation of the digital controlled attenuator in the full frequency band to the maximum value, use the computer control unit to control the output frequency of each frequency point of the SiP frequency source, and use the power measuring instrument to collect the power value corresponding to each frequency point; S2. Setting the calibration times, and using the computer control unit to assign values ​​and make numerical judgments on the calibration times; S3. When the number of calibration times is equal to 1, the computer control unit calculates the pre-attenuation code of the current frequency point according to the maximum attenuation of the digital controlled attenuator, the power target value and the measured frequency power value, configures the attenuation of the digital controlled attenuator according to the calculated pre-attenuation code, and uses the power measuring instrument to re-collect the frequency power value corresponding to the current frequency point, and determines whether the degree of deviation of the frequency power value from the power target value meets the threshold requirement. If it meets the threshold requirement, the current attenuation of the frequency point is used as the attenuation after calibration; S4. When the degree to which the frequency power value deviates from the power target value does not meet the threshold requirement, the count value of the number of calibrations is increased by 1, and it is determined whether the current frequency power value is greater than the power target value. According to different judgment results, the attenuation value used in the last calibration, the power target value, and the frequency power value collected in the last calibration are used to calculate the attenuation code of the frequency. According to the calculated attenuation code, the attenuation value of the digital attenuator is configured, and the frequency power value corresponding to the current frequency is recollected using the power measuring instrument. It is determined whether the degree to which the frequency power value deviates from the power target value meets the threshold requirement. If it meets the threshold requirement, the current attenuation value of the frequency is used as the attenuation value after calibration. If it does not meet the threshold requirement, the above process is repeated until the measured frequency power value meets the threshold requirement. S5. After all frequency points are calibrated, an attenuation code table is formed according to the calibrated attenuation values ​​of all frequency points, and the attenuation code table is saved in the miniaturized control unit.

5. The broadband three-dimensional stacked SiP frequency source internal calibration method according to claim 4, characterized in that: The power target value is between the minimum power value of all frequency points when the attenuation of the digital controlled attenuator is 0 and the maximum power value of all frequency points when the attenuation of the digital controlled attenuator is the maximum attenuation.

6. The broadband three-dimensional stacked SiP frequency source internal calibration method according to claim 4, characterized in that: Step S1 includes: S11, setting the attenuation of the digital controlled attenuator in the full frequency band to a maximum value M, and writing it into the miniaturized control unit; S12, setting a frequency point variable x; wherein the initial value of the frequency point variable x is 0; S13, add 1 to the frequency variable x count and assign it to x, overwriting the previous value of x, that is, x=x+1; S14, the computer control unit sends a frequency code for controlling the output frequency of the SiP frequency source module to the miniaturized control unit, and the miniaturized control unit generates a frequency control signal according to the frequency code to control the output frequency of the broadband frequency synthesis circuit at the current frequency point; S15, using a power measuring instrument to collect the power value corresponding to the current frequency point output by the SiP frequency source module; S16. Determine whether the frequency variable x is less than the total number of frequency points, that is, determine whether the measurement of the power values ​​of all frequency points under the maximum attenuation value is completed; if it is less than, return to step S13; otherwise, execute step S2.

7. The broadband three-dimensional stacked SiP frequency source internal calibration method according to claim 6, characterized in that: Step S2 includes: S21, initialize the frequency point variable x, even if x is equal to 0; S22, the frequency point variable x count is increased by 1, and the value is assigned to x, covering the previous value of x, that is, x=x+1; S23, the computer control unit sends a frequency code for controlling the output frequency of the SiP frequency source module to the miniaturized control unit, and the miniaturized control unit generates a frequency control signal according to the frequency code to control the output frequency of the broadband frequency synthesis circuit at the current frequency point; S24, setting the calibration times variable n, the initial value of which is 0; S25, adding 1 to the calibration times variable n, and assigning the value to n, overwriting the previous value of n, that is, n=n+1; S26. Determine whether n is equal to 1. If n is equal to 1, execute step S3; if n is greater than 1, execute step S4.

8. The broadband three-dimensional stacked SiP frequency source internal calibration method according to claim 7, characterized in that: Step S3 includes: S31, calculating the pre-attenuation code of the current frequency point, including: a fx1 =M-(P0-P fx_M ) Among them, a fx1 Indicates the pre-attenuation code of the current frequency point x, M indicates the maximum attenuation of the digital attenuator, P0 indicates the power target value, It indicates the frequency power value of the xth frequency point measured when the attenuation of the digital controlled attenuator is M; S32, the attenuation of the digital controlled attenuator is configured according to the calculated pre-attenuation code: S33, using a power measuring instrument to re-collect the frequency power value corresponding to the current frequency; S34, judging whether the degree to which the frequency power value deviates from the power target value meets the threshold requirement, including: in, Indicates the attenuation of the digital controlled attenuator is The frequency power value of the xth frequency point measured at , s represents the set threshold; When the power value of the frequency point deviates from the power target value to the extent that it meets the threshold requirement, the current attenuation of the frequency point is as the attenuation after calibration; if it does not meet the threshold requirement, return to step S25 and re-calibrate.

9. The broadband three-dimensional stacked SiP frequency source internal calibration method according to claim 8, characterized in that: Step S4 includes: S41, judging whether the power value of the current frequency point is greater than the power target value, including: in, Indicates the frequency power value of frequency point x after the n-1th calibration; S42: When the frequency power value is greater than or equal to the power target value, the attenuation code of the frequency is calculated, including: S43, when the frequency power value is less than the power target value, the attenuation code of the frequency is calculated, including: in, Indicates the attenuation code of frequency point x at the nth calibration; Indicates the attenuation code of frequency point x at the n-1th calibration; S44, the attenuation of the digital controlled attenuator is configured according to the calculated attenuation code: S45, using a power measuring instrument to re-collect the frequency power value corresponding to the current frequency; S46, judging whether the degree to which the frequency power value deviates from the power target value meets the threshold requirement, including: in, Indicates the attenuation of the digital controlled attenuator is The frequency power value of the xth frequency point measured at the time is the frequency power value after the nth calibration; When the power value of the frequency point deviates from the power target value to the extent that it meets the threshold requirement, the current attenuation value a of the frequency point is fxn as the attenuation after calibration; if it does not meet the threshold requirement, return to step S25 and re-calibrate.

10. The broadband three-dimensional stacked SiP frequency source internal calibration method according to claim 4, characterized in that: Step S5 includes: After all frequency points are calibrated, an attenuation code table is formed according to the calibrated attenuation of all frequency points, and the attenuation code table is saved in the miniaturized control unit to complete the calibration; during the operation of the calibrated broadband three-dimensional stacked SiP frequency source on the machine, the attenuation code corresponding to the output frequency is obtained from the miniaturized control unit to control the CNC attenuator to achieve output power adjustment.

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