Transceiver and gain flatness adjustment method thereof

Abstract

This invention discloses a transceiver and its gain flatness adjustment method. The transceiver includes a transmit flatness adjustment circuit and a receive flatness adjustment circuit respectively added to the transmit link and receive link. Both the transmit and receive flatness adjustment circuits include multiple resonant units connected in parallel, each resonant unit including a series-connected RF switch and a resonant circuit. The maximum transmit gain fluctuation or maximum receive gain fluctuation under each switch state combination is calculated based on the transmit power or receive power. The optimal switch state combination is determined based on the maximum transmit gain fluctuation or maximum receive gain fluctuation under all switch state combinations, thereby controlling the RF switch state and achieving gain flatness adjustment of the transmit link or receive link. This invention can adapt to gain flatness differences caused by changes in different scenarios, improving the accuracy of gain flatness adjustment.

Description

Technical Field

[0001] This invention belongs to the field of gain flatness adjustment technology, and particularly relates to a transceiver and its gain flatness adjustment method. Background Technology

[0002] The existing methods for adjusting gain flatness mainly include the following:

[0003] (1) Using equalizers for compensation: This method is suitable for higher frequency scenarios, but because the compensation amount of a single equalizer is small, when the flatness fluctuates greatly, multiple stages need to be connected in series, resulting in a very long design link, severe gain attenuation, and inability to achieve flexible adjustment.

[0004] (2) Using a single-stage RLC compensation method: Although this method is simple to design, it cannot be flexibly adjusted, cannot meet the error compensation caused by individual product differences or performance changes, and the compensation effect is not good;

[0005] (3) Using multi-level RLC compensation method: This method has relatively high compensation accuracy, but the design is complex, cannot be flexibly adjusted, and cannot meet the error compensation caused by individual product differences or performance changes.

[0006] For example, Chinese Patent CN116232265A discloses a filter in-band flatness adjustment device and method. This method uses a variable resistor and a resonator connected in series, then in parallel to the filter to adjust in-band ripple. The number of adjustment devices is determined by the number of ripple points, making the adjustment process flexible, controllable, and simple to operate. Another example is Chinese Patent CN117176100A, which discloses a bandpass filter circuit and filter for improving in-band flatness. This circuit connects an equalizer between an LC parallel resonant unit and the output terminal, using the equalizer to improve the insertion loss in the center frequency band, thus flattening the entire channel.

[0007] The above methods are usually designed for the entire full bandwidth scenario, and in actual use, only a certain bandwidth segment is usually selected, which is not flexible enough; the pure hardware design is not convenient to adjust according to the specific use scenario; it cannot meet the requirements of high bandwidth and high flatness with low cost and small size; it cannot handle the function of real-time adjustment due to changes in flatness caused by product aging; and it does not have the function of independent parameter configuration due to differences caused by product consistency. Summary of the Invention

[0008] The purpose of this invention is to provide a transceiver and its gain flatness adjustment method to solve the problems that traditional technologies cannot cope with the differences in gain flatness caused by changes in different scenarios, and the poor accuracy of gain flatness adjustment.

[0009] The present invention solves the above-mentioned technical problems through the following technical solution: a transceiver, comprising a signal control and processing module, a transmit link, a receive link, a circulator, a first coupler and an antenna, wherein the signal control and processing module is connected to the input end of the transmit link and the output end of the receive link, the output end of the transmit link and the input end of the receive link are connected to the circulator, and the circulator is connected to the antenna through the first coupler;

[0010] The transceiver further includes a transmit power detection circuit, a receive power detection circuit, a transmit flatness adjustment circuit, and a receive flatness adjustment circuit; the input and output terminals of the transmit power detection circuit are respectively connected to the first coupler and the signal control processing module, and the input and output terminals of the receive power detection circuit are respectively connected to the second coupler and the signal control processing module in the receive link; the transmit flatness adjustment circuit is located in the intermediate frequency band of the transmit link, and the receive flatness adjustment circuit is located in the radio frequency band of the receive link;

[0011] Both the transmit flatness adjustment circuit and the receive flatness adjustment circuit include multiple resonant units connected in parallel, and each resonant unit includes a radio frequency switch and a resonant circuit connected in series.

[0012] Furthermore, the signal control processing module is configured to calculate the maximum transmit gain fluctuation under each switching state combination in the transmit flatness adjustment circuit based on the transmit power detected by the transmit power detection circuit, determine the optimal switching state combination of the transmit flatness adjustment circuit based on the maximum transmit gain fluctuation under all switching state combinations, and then control the RF switching state of the transmit flatness adjustment circuit to achieve gain flatness adjustment of the transmit link; and to calculate the maximum receive gain fluctuation under each switching state combination in the receive flatness adjustment circuit based on the receive power detected by the receive power detection circuit, determine the optimal switching state combination of the receive flatness adjustment circuit based on the maximum receive gain fluctuation under all switching state combinations, and then control the RF switching state of the receive flatness adjustment circuit to achieve gain flatness adjustment of the receive link.

[0013] This invention adds flatness adjustment circuits to both the transmit and receive links. Based on the actual operating frequency band of the transceiver, the optimal switching state combination is determined by detecting the transmit or receive power, thereby controlling the RF switch states in the flatness adjustment circuits and achieving gain flatness adjustment of the transmit or receive links. This invention achieves gain flatness adjustment through a combination of hardware and software, adapting to gain flatness differences caused by varying scenarios; and by using multiple resonant units, it achieves finer adjustment of gain flatness, improving the accuracy of gain flatness adjustment.

[0014] Furthermore, the transmission link includes a transmission intermediate frequency filter amplifier circuit, a transmission frequency converter circuit, a transmission radio frequency filter circuit, and a transmission power amplifier circuit connected in sequence;

[0015] The receiving link includes a receiving limiting low-noise amplifier circuit, a receiving radio frequency filter circuit, a receiving frequency conversion circuit, a receiving intermediate frequency filter amplifier circuit, and a second coupler connected in sequence.

[0016] Furthermore, the transceiver also includes a transmit gain adjustable amplifier and a receive gain adjustable amplifier, wherein the transmit gain adjustable amplifier is located after the transmit flatness adjustment circuit, and the receive gain adjustable amplifier is located after the receive flatness adjustment circuit.

[0017] The signal control processing module is further configured to adjust the transmit gain adjustable amplifier based on the difference between the transmit power detected by the transmit power detection circuit and the target transmit power, so that the transmit power is within the error range of the target transmit power; and is further configured to adjust the receive gain adjustable amplifier based on the difference between the receive power detected by the receive power detection circuit and the target receive power, so that the receive power is within the error range of the target receive power.

[0018] The addition of transmit flatness adjustment circuits and receive flatness adjustment circuits will cause gain loss in the transmit and receive links. Therefore, gain-adjustable amplifiers are added to the transmit and receive links respectively. The gain-adjustable amplifiers are adjusted according to the difference between the detected power and the corresponding target power to compensate for the gain loss caused by the flatness adjustment circuits.

[0019] Furthermore, the resonant circuit is an RLC resonant circuit.

[0020] Based on the same concept, the present invention also provides a method for adjusting the gain flatness of a transceiver, the transceiver including a transmit link and a receive link, a transmit flatness adjustment circuit is added in the intermediate frequency band of the transmit link, and a receive flatness adjustment circuit is added in the radio frequency band of the receive link. Both the transmit flatness adjustment circuit and the receive flatness adjustment circuit include multiple resonant units connected in parallel, and each resonant unit includes a series radio frequency switch and a resonant circuit.

[0021] The adjustment method includes:

[0022] For each combination of switching states in the transmit flatness adjustment circuit or the receive flatness adjustment circuit, detect the transmit power or receive power corresponding to different frequency points within the operating frequency band;

[0023] Calculate the maximum transmit gain fluctuation or maximum receive gain fluctuation under the corresponding switch state combination based on the transmit power or receive power corresponding to different frequency points within the frequency band.

[0024] The optimal switching state combination for the transmit flatness adjustment circuit or the receive flatness adjustment circuit is determined based on the maximum transmit gain fluctuation or the maximum receive gain fluctuation under all switching state combinations.

[0025] The RF switching states of the transmit flatness adjustment circuit or the receive flatness adjustment circuit are controlled according to the optimal combination of switching states of the transmit flatness adjustment circuit or the receive flatness adjustment circuit, thereby realizing the gain flatness adjustment of the transmit link or the receive link.

[0026] Furthermore, the transmit power at different frequency points within the used frequency band is detected, specifically including:

[0027] For each frequency point within the frequency band used, the transceiver's signal control and processing module generates a transmit intermediate frequency signal based on the frequency point.

[0028] The intermediate frequency signal is processed using the transceiver's transmission link and then radiated outward through the antenna, and the transmission power corresponding to the frequency point is detected.

[0029] Detecting the received power at different frequency points within the used frequency band, specifically including:

[0030] For each frequency point within the frequency band, a reference source is used to generate a radio frequency signal based on the frequency point and radiate it to the transceiver.

[0031] The radiated signal from the reference source is received and processed using the receiving link of the transceiver, and the received power corresponding to the frequency point is detected.

[0032] Furthermore, the maximum transmit gain fluctuation under the corresponding switching state combination is calculated based on the transmit power corresponding to different frequency points within the frequency band, specifically including:

[0033] Select the maximum and minimum transmit power from the transmit power corresponding to different frequency points within the frequency band;

[0034] Calculate the difference between the maximum and minimum transmit power to obtain the maximum transmit gain fluctuation under the corresponding switch state combination;

[0035] The maximum receive gain fluctuation under the corresponding switching state combination is calculated based on the received power at different frequency points within the frequency band, specifically including:

[0036] Select the maximum and minimum received power from the received power corresponding to different frequency points within the frequency band;

[0037] Calculate the difference between the maximum and minimum received power to obtain the maximum received gain fluctuation under the corresponding switching state combination.

[0038] Furthermore, the optimal switching state combination of the transmit flatness adjustment circuit refers to the switching state combination corresponding to the minimum value among the maximum transmit gain fluctuations under all switching state combinations.

[0039] The optimal switching state combination of the receiving flatness adjustment circuit refers to the switching state combination corresponding to the minimum value among the maximum receiving gain fluctuations under all switching state combinations.

[0040] Furthermore, an adjustable transmit gain amplifier is added after the transmit flatness adjustment circuit, and an adjustable receive gain amplifier is added after the receive flatness adjustment circuit.

[0041] The adjustment method further includes:

[0042] Under the optimal switching state combination of the transmit flatness adjustment circuit or the receive flatness adjustment circuit, detect the transmit power or receive power;

[0043] Adjust the transmit gain amplifier according to the difference between the transmit power and the target transmit power so that the transmit power is within the error range of the target transmit power; or, adjust the receive gain amplifier according to the difference between the receive power and the target receive power so that the receive power is within the error range of the target receive power.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0045] This invention adjusts gain flatness through a combination of hardware and software, which can adapt to the differences in gain flatness caused by changes in different scenarios; and achieves finer adjustment of gain flatness through multiple resonant units, thereby improving the accuracy of gain flatness adjustment. Attached Figure Description

[0046] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only one embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a structural block diagram of the transceiver in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the emission flatness adjustment circuit in an embodiment of the present invention;

[0049] Figure 3 This is the insertion loss curve of the transmit flatness adjustment circuit in this embodiment of the invention; where the horizontal axis freq represents the frequency in MHz; and the vertical axis S(2,1) represents the insertion loss in dB.

[0050] Figure 4 This is a flowchart of the transmit gain flatness adjustment in an embodiment of the present invention;

[0051] Figure 5 This is a flowchart of the receiver gain flatness adjustment in an embodiment of the present invention. Detailed Implementation

[0052] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0054] Example 1

[0055] Radio frequency (RF) links typically consist of multiple stages of amplification, filtering, and frequency conversion units. The gain flatness of each component deteriorates within its bandwidth, and cascading multiple stages leads to significant fluctuations in gain flatness across the bandwidth, impacting signal quality. Traditional gain flatness adjustment methods are limited to a fixed bandwidth and cannot be adjusted according to specific usage scenarios or address real-time adjustments needed to accommodate flatness changes caused by product aging. To address the differences in gain flatness across different frequency bands and achieve precise gain flatness adjustment, this invention provides a transceiver with transmit / receive gain flatness adjustment capabilities.

[0056] like Figure 1 As shown, the transceiver provided by the present invention includes a signal control and processing module, a transmit link, a receive link, a circulator, a first coupler, an antenna, a transmit power detection circuit, a receive power detection circuit, a transmit flatness adjustment circuit, and a receive flatness adjustment circuit. The signal control and processing module is connected to the input terminal of the transmit link and the output terminal of the receive link. The output terminal of the transmit link and the input terminal of the receive link are connected to the circulator. The circulator is connected to the antenna through the first coupler. The input and output terminals of the transmit power detection circuit are respectively connected to the first coupler and the signal control and processing module. The input and output terminals of the receive power detection circuit are respectively connected to the second coupler in the receive link and the signal control and processing module. The transmit flatness adjustment circuit is located in the intermediate frequency band of the transmit link, and the receive flatness adjustment circuit is located in the radio frequency band of the receive link.

[0057] like Figure 1As shown, the transmit link includes a transmit intermediate frequency (IF) filter amplifier circuit, a transmit frequency converter circuit, a transmit radio frequency (RF) filter circuit, and a transmit power amplifier circuit connected in sequence; the receive link includes a receive limiting low-noise amplifier circuit, a receive RF filter circuit, a receive frequency converter circuit, a receive IF filter amplifier circuit, and a second coupler connected in sequence. In this embodiment, the transmit flatness adjustment circuit is located between the transmit IF filter amplifier circuit and the transmit frequency converter circuit, and the receive flatness adjustment circuit is located between the receive RF filter circuit and the receive frequency converter circuit.

[0058] The signal control and processing module generates a transmit intermediate frequency (IF) signal based on the frequency points within the operating frequency band; the transmit IF filtering and amplification circuit filters and amplifies the transmit IF signal; the transmit flatness adjustment circuit adjusts the gain flatness of the transmit link based on the filtered and amplified transmit IF signal; the transmit frequency conversion circuit up-converts the transmit IF signal to obtain a transmit radio frequency (RF) signal; the transmit RF filtering circuit filters the transmit RF signal; the transmit power amplification circuit amplifies the power of the filtered transmit RF signal; the first coupler couples a portion of the energy for transmit power detection; the circulator isolates and combines transmit and receive signals; and the transmit power detection circuit detects the transmit power of the portion of energy coupled by the first coupler.

[0059] The receiving limiting low-noise amplifier circuit is used to limit the amplitude and amplify the received RF signal with low noise; the receiving RF filtering circuit is used to filter the received RF signal after low-noise amplification; the receiving flatness adjustment circuit is used to adjust the gain flatness of the receiving link according to the filtered received RF signal; the receiving frequency conversion circuit is used to down-convert the received RF signal to obtain the received intermediate frequency signal; the receiving intermediate frequency filtering and amplification circuit is used to filter and amplify the received intermediate frequency signal; the energy coupled by the second coupler is used for receiving power detection; the receiving power detection circuit is used to detect the received power of the energy coupled by the second coupler.

[0060] Couplers are designed at the ends of both the transmit and receive links to ensure low-loss transmission of normal signals and to couple a very small portion of RF energy for power detection.

[0061] like Figure 2As shown, both the transmit flatness adjustment circuit and the receive flatness adjustment circuit include multiple resonant units connected in parallel. Each resonant unit includes a series-connected RF switch and a resonant circuit. The RF switch is used to control the gating function of the corresponding resonant circuit under the control of the signal control and processing module, and has advantages such as high frequency support, fast switching speed, low insertion loss, and low VSWR. The resonant circuit is used to generate the resonant frequency, exhibiting different insertion loss characteristics at different frequency points. In this embodiment, the resonant circuit adopts an RLC resonant circuit, where R (resistance) can adjust the Q value of the resonant circuit, change the resonance depth, and adjust the degree of change in insertion loss at different frequency points.

[0062] The signal control processing module calculates the maximum transmit gain fluctuation under each switching state combination in the transmit flatness adjustment circuit based on the transmit power detected by the transmit power detection circuit. Based on the maximum transmit gain fluctuation under all switching state combinations, it determines the optimal switching state combination for the transmit flatness adjustment circuit, thereby controlling the RF switching state of the transmit flatness adjustment circuit. Similarly, based on the receive power detected by the receive power detection circuit, it calculates the maximum receive gain fluctuation under each switching state combination in the receive flatness adjustment circuit. Based on the maximum receive gain fluctuation under all switching state combinations, it determines the optimal switching state combination for the receive flatness adjustment circuit, thereby controlling the RF switching state of the receive flatness adjustment circuit. In this embodiment, the signal control processing module is an FPGA and a signal processing unit.

[0063] Based on multiple scenarios in the actual application of the transceiver, a relatively wide frequency band is determined. The number of resonant units in the transmit and receive flatness adjustment circuits is then determined according to this wide frequency band, enabling adjustment of transmit and receive gain flatness within the wider band. Specifically, design and simulation are performed based on the wider frequency band. The basic principle is that the frequency points of each resonant unit are staggered, and the resonance depth varies in a stepwise manner. The number and parameters of the resonant units are determined through simulation and actual debugging.

[0064] In this embodiment, the number of resonant units is 5. Taking a relatively wide frequency band of 500MHz±100MHz as an example, a set of global parameters is simulated, which can satisfy the compensation of nearly 5dB of gain flatness within a 200MHz bandwidth. Assuming that a practical application only uses a narrower frequency band of 500MHz±10MHz, the gain flatness compensation range can be adjusted from 0.3dB to 1.3dB through software control. The specific switching state combinations are shown in Table 1.

[0065] Table 1 Gain flatness compensation values ​​for the 500MHz±10MHz frequency band

[0066] Serial Number Switching states of each resonant unit Compensation value for gain flatness within a 20MHz bandwidth 1 The RF switches of all five resonant units are closed. 0.5dB 2 The radio frequency switches of the 1st, 2nd, 4th, and 5th resonant units are closed. 0.3dB 3 The radio frequency switches of the 3rd, 4th, and 5th resonant units are closed. 1dB 4 The radio frequency switches of the 1st, 4th, and 5th resonant units are closed. 1.2dB 5 The radio frequency switches of the second and third resonant units are closed. 1.3dB

[0067] The insertion loss of the emitter flatness adjustment circuit under a certain combination of switching states was simulated, and the simulation curves are shown below. Figure 3 As shown. By Figure 3 It can be seen that when all five resonant units are working, a gain flatness compensation of nearly 5dB can be achieved within a bandwidth of 500MHz±100MHz, which can meet the needs of most applications; there is a gain flatness compensation of nearly 0.5dB within a bandwidth of 500MHz±10MHz, and by adjusting the switching state, a gain flatness compensation of 0.3dB~1.3dB can be achieved within this bandwidth.

[0068] Adding transmit flatness adjustment circuits and receive flatness adjustment circuits to the transmit and receive links respectively causes gain loss in both links. To solve this problem, this invention adds transmit gain adjustable amplifiers and receive gain adjustable amplifiers to the transmit and receive links respectively. The transmit gain adjustable amplifier is located after the transmit flatness adjustment circuit, and the receive gain adjustable amplifier is located after the receive flatness adjustment circuit. The direction of signal flow out of the transmit flatness adjustment circuit is after the transmit flatness adjustment circuit, and the direction of signal flow out of the receive flatness adjustment circuit is after the receive flatness adjustment circuit. Specifically, a transmit gain adjustable amplifier is added between the transmit flatness adjustment circuit and the transmit frequency conversion circuit, and a receive gain adjustable amplifier is added between the receive intermediate frequency filter amplifier circuit and the second coupler.

[0069] The signal control processing module adjusts the transmit gain adjustable amplifier based on the difference between the transmit power detected by the transmit power detection circuit and the target transmit power, so that the transmit power is within the error range of the target transmit power; and adjusts the receive gain adjustable amplifier based on the difference between the receive power detected by the receive power detection circuit and the target receive power, so that the receive power is within the error range of the target receive power.

[0070] The overall gain is adjusted by adding adjustable transmit and receive amplifiers, which can meet both the gain requirements and the in-band gain flatness requirements.

[0071] This invention places the transmit flatness adjustment circuit in the intermediate frequency (IF) stage of the transmit link and the receive flatness adjustment circuit in the radio frequency (RF) stage of the receive link, employing a simple RLC resonant circuit compensation method, thus reducing cost and complexity. The use of a multi-stage resonant circuit parallel design improves adjustment accuracy over a wider bandwidth, achieving more refined gain flatness adjustment. By controlling the state of the RF switches, the most suitable resonant units can be selected and combined autonomously. This invention couples and collects transmit and receive power to form a negative feedback circuit, automatically selecting the optimal switch state combination based on the detected transmit or receive power levels and in conjunction with software, improving the gain flatness adjustment effect. This invention allows for independent adjustment based on individual product differences, enabling flexible use; it can be adjusted for specific operating frequency bands, allowing for flexible use; and it can adjust in real time for flatness changes caused by aging and other factors.

[0072] Example 2

[0073] Based on the transceiver in Embodiment 1, the gain flatness adjustment method for the transceiver provided by this invention includes transmit gain flatness adjustment and receive gain flatness adjustment. For example... Figure 4 As shown, transmit gain flatness adjustment includes:

[0074] Step A1: For each combination of switching states in the transmit flatness adjustment circuit, detect the transmit power corresponding to different frequency points within the operating frequency band.

[0075] The number of switching state combinations is determined by the number of resonant units in the transmit gain flatness adjustment circuit. For example, with 5 resonant units, there are 32 switching state combinations.

[0076] For each frequency point within the operating frequency band, the transceiver's signal control and processing module generates a transmit intermediate frequency (IF) signal for each frequency point. The transceiver's transmit link processes the transmit IF signal and radiates it outward through the antenna. The transmit power detection circuit detects the transmit power corresponding to each frequency point. For example, for the operating frequency band 500MHz±10MHz, M frequency points are selected to generate transmit IF signals. Each frequency point corresponds to a transmit IF signal and a transmit frequency, thus obtaining M transmit powers for each combination of switching states.

[0077] Step A2: Calculate the maximum transmit gain fluctuation under the corresponding switching state combination based on the transmit power corresponding to different frequency points within the frequency band.

[0078] The maximum and minimum transmit power are selected from the transmit power corresponding to different frequency points within the operating frequency band; the difference between the maximum and minimum transmit power is calculated to obtain the maximum transmit gain fluctuation under the corresponding switching state combination. For example, for the operating frequency band 500MHz±10MHz, the maximum and minimum transmit power are selected from M transmit power values ​​under each switching state combination, and then the maximum transmit gain fluctuation under that switching state combination is calculated.

[0079] Step A3: Determine the optimal switching state combination for the transmit flatness adjustment circuit based on the maximum transmit gain fluctuation under all switching state combinations.

[0080] The optimal switching combination for the transmit flatness adjustment circuit is the switching combination that corresponds to the minimum maximum transmit gain fluctuation among all switching state combinations.

[0081] Step A4: Control the RF switching state of the transmit flatness adjustment circuit according to the optimal switching state combination of the transmit flatness adjustment circuit to realize the gain flatness adjustment of the transmit link.

[0082] like Figure 5 As shown, receiver gain flatness adjustment includes:

[0083] Step B1: For each combination of switching states in the receiver flatness adjustment circuit, detect the received power corresponding to different frequency points within the operating frequency band.

[0084] For each frequency point within the operating frequency band, an additional reference source is needed to generate a transmit intermediate frequency (IF) signal for each frequency point. After processing, the transmit IF signal is radiated to the transceiver via an antenna. The transceiver's receiving link receives and processes the radiated signal from the reference source, and a receive power detection circuit detects the received power at each frequency point. For example, in the operating frequency band of 5500MHz ± 100MHz, M frequency points are selected to radiate radio frequency (RF) signals to the transceiver via the reference source. Each frequency point corresponds to a radiated signal and a receiving frequency, thus yielding M received powers for each combination of switching states.

[0085] Step B2: Calculate the maximum receive gain fluctuation under the corresponding switching state combination based on the received power at different frequency points within the frequency band.

[0086] The maximum and minimum received power are selected from the received power corresponding to different frequency points within the operating frequency band; the difference between the maximum and minimum received power is calculated to obtain the maximum received gain fluctuation under the corresponding switching state combination. For example, for the operating frequency band 5500MHz±100MHz, the maximum and minimum received power are selected from M received power values ​​under each switching state combination, and then the maximum received gain fluctuation under that switching state combination is calculated.

[0087] Step B3: Determine the optimal switching state combination for the receiver flatness adjustment circuit based on the maximum receiver gain fluctuation under all switching state combinations.

[0088] The optimal switching state combination for the receiver flatness adjustment circuit is the switching state combination that corresponds to the minimum value among the maximum receiver gain fluctuations under all switching state combinations.

[0089] Step B4: Control the RF switching state of the receiver flatness adjustment circuit according to the optimal switching state combination of the receiver flatness adjustment circuit to realize the gain flatness adjustment of the receiver link.

[0090] When the frequency band of the transceiver changes, the gain flatness of the transmit and receive links is readjusted according to the gain flatness adjustment method of the present invention, which can cope with the gain flatness differences caused by different scenario changes (such as environmental changes or aging) and improve adaptability.

[0091] In a specific embodiment of the present invention, an adjustable transmission gain amplifier is added between the transmission flatness adjustment circuit and the transmission frequency conversion circuit, and the transmission gain flatness adjustment further includes:

[0092] Step A5: Detect the transmission power under the optimal switching state combination of the transmit flatness adjustment circuit;

[0093] Step A6: Adjust the transmit gain adjustable amplifier according to the difference between the transmit power detected in step A5 and the target transmit power, so that the transmit power is within the error range of the target transmit power.

[0094] In a specific embodiment of the present invention, a receiver gain adjustable amplifier is added between the receiving intermediate frequency filter amplifier circuit and the second coupler, and the receiver gain flatness adjustment further includes:

[0095] Step B5: Detect the received power under the optimal switching state combination of the receiver flatness adjustment circuit;

[0096] Step B6: Adjust the receive gain adjustable amplifier according to the difference between the received power detected in step B5 and the target received power, so that the received power is within the error range of the target received power.

[0097] By adjusting the transmit and receive gain adjustable amplifiers, the gain loss in the transmit and receive links caused by the addition of transmit and receive flatness adjustment circuits is compensated, thus satisfying both gain requirements and in-band gain flatness requirements. For gain flatness differences caused by variations in different scenarios, this invention can achieve automated gain flatness adjustment without manual intervention, greatly improving adjustment efficiency.

[0098] The above description only discloses specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or modifications that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A transceiver, comprising a signal control and processing module, a transmit link, a receive link, a circulator, a first coupler, and an antenna, wherein the signal control and processing module is connected to the input terminal of the transmit link and the output terminal of the receive link, the output terminal of the transmit link and the input terminal of the receive link are connected to the circulator, and the circulator is connected to the antenna via the first coupler; characterized in that: The transceiver further includes a transmit power detection circuit, a receive power detection circuit, a transmit flatness adjustment circuit, and a receive flatness adjustment circuit; the input and output terminals of the transmit power detection circuit are respectively connected to the first coupler and the signal control processing module, and the input and output terminals of the receive power detection circuit are respectively connected to the second coupler and the signal control processing module in the receive link; the transmit flatness adjustment circuit is located in the intermediate frequency band of the transmit link, and the receive flatness adjustment circuit is located in the radio frequency band of the receive link; Both the transmit flatness adjustment circuit and the receive flatness adjustment circuit include multiple resonant units connected in parallel, and each resonant unit includes a radio frequency switch and a resonant circuit connected in series.

2. The transceiver according to claim 1, characterized in that: The signal control processing module is used to calculate the maximum transmit gain fluctuation under each switching state combination in the transmit flatness adjustment circuit based on the transmit power detected by the transmit power detection circuit, determine the optimal switching state combination of the transmit flatness adjustment circuit based on the maximum transmit gain fluctuation under all switching state combinations, and then control the RF switching state of the transmit flatness adjustment circuit to realize the gain flatness adjustment of the transmit link. And it is used to calculate the maximum receive gain fluctuation under each switching state combination in the receive flatness adjustment circuit based on the received power detected by the receive power detection circuit, determine the optimal switching state combination of the receive flatness adjustment circuit based on the maximum receive gain fluctuation under all switching state combinations, and then control the RF switching state of the receive flatness adjustment circuit to realize the gain flatness adjustment of the receive link.

3. The transceiver according to claim 1, characterized in that: The transmission link includes a transmission intermediate frequency filter and amplifier circuit, a transmission frequency converter circuit, a transmission radio frequency filter circuit, and a transmission power amplifier circuit connected in sequence. The receiving link includes a receiving limiting low-noise amplifier circuit, a receiving radio frequency filter circuit, a receiving frequency converter circuit, a receiving intermediate frequency filter amplifier circuit, and a second coupler connected in sequence.

4. The transceiver according to claim 1, characterized in that: The transceiver also includes a transmit gain adjustable amplifier and a receive gain adjustable amplifier, wherein the transmit gain adjustable amplifier is located after the transmit flatness adjustment circuit, and the receive gain adjustable amplifier is located after the receive flatness adjustment circuit. The signal control processing module is also used to adjust the transmit gain adjustable amplifier according to the difference between the transmit power detected by the transmit power detection circuit and the target transmit power, so that the transmit power is within the error range of the target transmit power; It is also used to adjust the receive gain adjustable amplifier based on the difference between the received power detected by the receive power detection circuit and the target received power, so that the received power is within the error range of the target received power.

5. The transceiver according to any one of claims 1 to 4, characterized in that: The resonant circuit is an RLC resonant circuit.

6. A method for adjusting the gain flatness of a transceiver, the transceiver comprising a transmit link and a receive link, characterized in that: A transmit flatness adjustment circuit is added to the intermediate frequency band of the transmit link, and a receive flatness adjustment circuit is added to the radio frequency band of the receive link. Both the transmit flatness adjustment circuit and the receive flatness adjustment circuit include multiple resonant units connected in parallel, and each resonant unit includes a series radio frequency switch and a resonant circuit. The adjustment method includes: For each combination of switching states in the transmit flatness adjustment circuit or the receive flatness adjustment circuit, detect the transmit power or receive power corresponding to different frequency points within the operating frequency band; Calculate the maximum transmit gain fluctuation or maximum receive gain fluctuation under the corresponding switch state combination based on the transmit power or receive power corresponding to different frequency points within the frequency band. The optimal switching state combination for the transmit flatness adjustment circuit or the receive flatness adjustment circuit is determined based on the maximum transmit gain fluctuation or the maximum receive gain fluctuation under all switching state combinations. The RF switching states of the transmit flatness adjustment circuit or the receive flatness adjustment circuit are controlled according to the optimal combination of switching states of the transmit flatness adjustment circuit or the receive flatness adjustment circuit, thereby realizing the gain flatness adjustment of the transmit link or the receive link.

7. The gain flatness adjustment method for a transceiver according to claim 6, characterized in that: Detecting the transmit power at different frequency points within the used frequency band, specifically including: For each frequency point within the frequency band used, the transceiver's signal control and processing module generates a transmit intermediate frequency signal based on the frequency point. The intermediate frequency signal is processed using the transceiver's transmission link and then radiated outward through the antenna, and the transmission power corresponding to the frequency point is detected. Detecting the received power at different frequency points within the used frequency band, specifically including: For each frequency point within the frequency band, a reference source is used to generate a radio frequency signal based on the frequency point and radiate it to the transceiver. The radiated signal from the reference source is received and processed using the receiving link of the transceiver, and the received power corresponding to the frequency point is detected.

8. The gain flatness adjustment method for a transceiver according to claim 6, characterized in that: The maximum transmit gain fluctuation under the corresponding switching state combination is calculated based on the transmit power at different frequency points within the operating frequency band, specifically including: Select the maximum and minimum transmit power from the transmit power corresponding to different frequency points within the frequency band; Calculate the difference between the maximum and minimum transmit power to obtain the maximum transmit gain fluctuation under the corresponding switch state combination; The maximum receive gain fluctuation under the corresponding switching state combination is calculated based on the received power at different frequency points within the frequency band, specifically including: Select the maximum and minimum received power from the received power corresponding to different frequency points within the frequency band; Calculate the difference between the maximum and minimum received power to obtain the maximum received gain fluctuation under the corresponding switching state combination.

9. The gain flatness adjustment method for a transceiver according to claim 6, characterized in that: The optimal switching state combination of the transmit flatness adjustment circuit refers to the switching state combination corresponding to the minimum value among the maximum transmit gain fluctuations under all switching state combinations. The optimal switching state combination of the receiving flatness adjustment circuit refers to the switching state combination corresponding to the minimum value among the maximum receiving gain fluctuations under all switching state combinations.

10. The method for adjusting the gain flatness of a transceiver according to any one of claims 6 to 9, characterized in that: An adjustable transmit gain amplifier is added after the transmit flatness adjustment circuit, and an adjustable receive gain amplifier is added after the receive flatness adjustment circuit. The adjustment method further includes: Under the optimal switching state combination of the transmit flatness adjustment circuit or the receive flatness adjustment circuit, detect the transmit power or receive power; Adjust the transmit gain amplifier according to the difference between the transmit power and the target transmit power so that the transmit power is within the error range of the target transmit power; or, adjust the receive gain amplifier according to the difference between the receive power and the target receive power so that the receive power is within the error range of the target receive power.

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