Transceiver and gain flatness adjusting method thereof

Abstract

The invention discloses a transceiver and a gain flatness adjusting method thereof. The transceiver comprises a transmitting flatness adjusting circuit and a receiving flatness adjusting circuit which are additionally arranged in a transmitting link and a receiving link respectively. Each of the transmitting flatness adjusting circuit and the receiving flatness adjusting circuit comprises a plurality of resonance units which are connected in parallel, and each resonance unit comprises a radio frequency switch and a resonance circuit which are connected in series; the maximum transmitting gain fluctuation or the maximum receiving gain fluctuation under each switch state combination is calculated according to the transmitting power or the receiving power, the optimal switch state combination is determined according to the maximum transmitting gain fluctuation or the maximum receiving gain fluctuation under all the switch state combinations, and then the radio frequency switch state is controlled. And the gain flatness adjustment of the transmitting link or the receiving link is realized. According to the invention, the method can adapt to the gain flatness difference caused by different scene changes, and improves the adjustment precision of the gain flatness.

Description

Technical Field

[0001] The present invention belongs to the technical field of gain flatness adjustment, and in particular relates to a transceiver and a gain flatness adjustment method thereof. Background Art

[0002] The existing gain flatness adjustment methods mainly include the following: (1) Using equalizer compensation: This method is suitable for higher frequency scenarios. However, since the compensation amount of a single equalizer is small, when the flatness fluctuates greatly, multiple stages are required in series, resulting in a very long design link, severe gain attenuation, and inability to achieve flexible adjustment. (2) Using a single-stage RLC compensation method: Although this method is simple in design, it cannot be adjusted flexibly and cannot meet the error compensation caused by individual differences or performance changes of products, and the compensation effect is poor; (3) Using multi-stage RLC compensation method: The compensation accuracy of this method is relatively high, but the design is complex and cannot be flexibly adjusted. It cannot meet the error compensation caused by individual differences or performance changes of products.

[0003] For example, Chinese Patent Publication No. CN116232265A discloses a filter in-band flatness adjustment device and method. This device uses a variable resistor and resonator connected in series, then connected in parallel to the filter to adjust in-band fluctuations. Adjustment devices are configured based on the number of fluctuation points, making the adjustment process flexible, controllable, and simple to operate. Another example is Chinese Patent Publication No. CN117176100A, which discloses a bandpass filter circuit and filter with improved in-band flatness. This device connects an equalizer between the LC parallel resonant unit and the output port, using it to increase insertion loss in the center frequency band and flatten the entire channel.

[0004] The above method can usually only be designed for the entire full-bandwidth scenario. In actual use, only a certain bandwidth segment is usually selected, which is not flexible enough. The pure hardware design is not convenient for adjustment according to specific usage scenarios. It cannot take into account the requirements of high bandwidth and high flatness with low cost and small size. It cannot respond to changes in flatness due to product aging and other reasons and make real-time adjustments. It does not have the function of independent parameter configuration due to differences caused by product consistency. Summary of the Invention

[0005] The object of the present invention is to provide a transceiver and a gain flatness adjustment method thereof, so as to solve the problems that conventional technologies cannot cope with the gain flatness differences caused by changes in different scenarios and the gain flatness adjustment accuracy is poor.

[0006] The present invention solves the above-mentioned technical problems through the following technical solutions: a transceiver, comprising a signal control processing module, a transmission link, a reception link, a circulator, a first coupler, and an antenna, wherein the signal control processing module is connected to an input end of the transmission link and an output end of the reception link, the output end of the transmission link and the input end of the reception link are connected to the circulator, and the circulator is connected to the antenna via the first coupler; 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 of the transmit power detection circuit are respectively connected to the first coupler and the signal control processing module, and the input and output of the receive power detection circuit are respectively connected to the second coupler and the signal control processing module in the receive chain; the transmit flatness adjustment circuit is provided in the intermediate frequency band of the transmit chain, and the receive flatness adjustment circuit is provided in the radio frequency band of the receive chain; The transmission flatness adjustment circuit and the reception flatness adjustment circuit both include a plurality of resonance units connected in parallel, and each resonance unit includes a radio frequency switch and a resonance circuit connected in series.

[0007] Furthermore, the signal control processing module is configured to calculate the maximum transmit gain fluctuation under each switch state combination in the transmit flatness adjustment circuit based on the transmit power detected by the transmit power detection circuit, determine the optimal switch state combination of the transmit flatness adjustment circuit based on the maximum transmit gain fluctuation under all switch state combinations, and thereby control the RF switch 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 switch state combination in the receive flatness adjustment circuit based on the receive power detected by the receive power detection circuit, determine the optimal switch state combination of the receive flatness adjustment circuit based on the maximum receive gain fluctuation under all switch state combinations, and thereby control the RF switch state of the receive flatness adjustment circuit to achieve gain flatness adjustment of the receive link.

[0008] The present invention adds flatness adjustment circuits to both the transmit and receive links. Based on the actual frequency band of the transceiver, the optimal switch state combination is determined by detecting transmit or receive power. This control then controls the RF switch state in the flatness adjustment circuit, achieving gain flatness adjustment for both the transmit and receive links. This invention uses a combination of software and hardware to adjust gain flatness, adapting to differences in gain flatness caused by varying scenarios. Multiple resonant units enable finer adjustment of gain flatness, improving the accuracy of gain flatness adjustment.

[0009] Furthermore, the transmission chain includes a transmission intermediate frequency filter amplifier circuit, a transmission frequency conversion circuit, a transmission radio frequency filter circuit and a transmission power amplifier circuit connected in sequence; The receiving chain includes a receiving amplitude 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 which are connected in sequence.

[0010] Furthermore, the transceiver further includes a transmission gain adjustable amplifier and a reception gain adjustable amplifier, wherein the transmission gain adjustable amplifier is provided after the transmission flatness adjustment circuit, and the reception gain adjustable amplifier is provided after the reception flatness adjustment circuit; The signal control processing module is further 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; and is also used to adjust the receive gain adjustable amplifier according to 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.

[0011] The addition of a transmit flatness adjustment circuit and a receive flatness adjustment circuit will cause gain loss in the transmit chain and the receive chain. Therefore, a gain-adjustable amplifier is added to the transmit chain and the receive chain respectively. The gain-adjustable amplifier is 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 circuit.

[0012] Furthermore, the resonant circuit is an RLC resonant circuit.

[0013] Based on the same concept, the present invention also provides a gain flatness adjustment method for a transceiver. The transceiver includes a transmitting chain and a receiving chain. A transmitting flatness adjustment circuit is added in the intermediate frequency band of the transmitting chain, and a receiving flatness adjustment circuit is added in the radio frequency band of the receiving chain. The transmitting flatness adjustment circuit and the receiving flatness adjustment circuit each include a plurality of resonance units connected in parallel, and each resonance unit includes a radio frequency switch and a resonance circuit connected in series. The adjustment method includes: For each switch state combination in the transmit flatness adjustment circuit or the receive flatness adjustment circuit, detecting the transmit power or receive power corresponding to different frequency points within the frequency band; Calculate the maximum transmission gain fluctuation or the maximum reception gain fluctuation under the corresponding switch state combination according to the transmission power or reception power corresponding to different frequency points in the used frequency band; determining an optimal switch state combination of the transmit flatness adjustment circuit or the receive flatness adjustment circuit according to the maximum transmit gain fluctuation or the maximum receive gain fluctuation under all switch state combinations; The RF switch state of the transmission flatness adjustment circuit or the reception flatness adjustment circuit is controlled according to the optimal switch state combination of the transmission flatness adjustment circuit or the reception flatness adjustment circuit to achieve gain flatness adjustment of the transmission link or the reception link.

[0014] Furthermore, the transmission power corresponding to different frequency points in the used frequency band is detected, specifically including: For each frequency point within the used frequency band, the signal control processing module of the transceiver generates a transmit intermediate frequency signal according to the frequency point; The transmitting intermediate frequency signal is processed by the transmitting link of the transceiver and then radiated outward through the antenna, and the transmitting power corresponding to the frequency point is detected; Detect the received power corresponding to different frequency points within the frequency band, including: For each frequency point within the used frequency band, a reference source is used to generate a radio frequency signal according to the frequency point and radiate the signal to the transceiver; The radiation signal of the reference source is received and processed by the receiving link of the transceiver, and the receiving power corresponding to the frequency point is detected.

[0015] Furthermore, the maximum transmit gain fluctuation under the corresponding switch state combination is calculated based on the transmit power corresponding to different frequency points within the used frequency band, specifically including: Select the maximum transmit power and the minimum transmit power among the transmit powers corresponding to different frequency points within the frequency band; Calculate the difference between the maximum transmit power and the minimum transmit power to obtain the maximum transmit gain fluctuation under the corresponding switch state combination; The maximum receive gain fluctuation under the corresponding switch state combination is calculated based on the receive power corresponding to different frequency points within the frequency band, specifically including: Select the maximum and minimum received powers among the received powers corresponding to different frequency points within the frequency band; The difference between the maximum received power and the minimum received power is calculated to obtain the maximum receive gain fluctuation under the corresponding switch state combination.

[0016] Furthermore, the optimal switch state combination of the transmission flatness adjustment circuit refers to the switch state combination corresponding to the minimum value of the maximum transmission gain fluctuation under all switch state combinations; The optimal switch state combination of the receiving flatness adjustment circuit refers to the switch state combination corresponding to the minimum value of the maximum receiving gain fluctuations under all switch state combinations.

[0017] Furthermore, a transmission gain adjustable amplifier is added after the transmission flatness adjustment circuit, and a reception gain adjustable amplifier is added after the reception flatness adjustment circuit; The adjustment method further includes: detecting the transmit power or the receive power under an optimal switch state combination of the transmit flatness adjustment circuit or the receive flatness adjustment circuit; Adjust the adjustable 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 adjustable 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.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention adjusts gain flatness by combining software and hardware, and can adapt to the gain flatness differences caused by changes in different scenarios; more precise adjustment of gain flatness is achieved through multiple resonant units, thereby improving the gain flatness adjustment accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the description of the embodiment. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a structural block diagram of a transceiver in an embodiment of the present invention; Figure 2 is a schematic diagram of a transmission flatness adjustment circuit in an embodiment of the present invention; Figure 3 : is an insertion loss curve of the transmission flatness adjustment circuit in an embodiment of the present invention; wherein the horizontal axis freq represents the frequency in MHz; the vertical axis S(2,1) represents the insertion loss in dB; Figure 4 is a flow chart of transmit gain flatness adjustment in an embodiment of the present invention; Figure 5 This is a flowchart of receiving gain flatness adjustment in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0022] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0023] Example 1 Radio frequency links are generally composed of multiple stages of amplification, filtering, and frequency conversion units. The gain flatness of each device within the bandwidth will deteriorate. Cascading multiple stages of devices will cause large fluctuations in gain flatness within the bandwidth, affecting signal quality. Traditional gain flatness adjustment methods can only be applied to a fixed bandwidth and cannot be adjusted according to specific usage scenarios. They cannot also handle changes in flatness due to factors such as product aging and require real-time adjustment. In order to address the differences in gain flatness caused by different actual frequency bands and achieve precise adjustment of gain flatness, the present invention provides a transceiver with transceiver gain flatness adjustment.

[0024] like Figure 1 As shown, the transceiver provided by the present invention includes a signal control processing module, a transmission link, a reception link, a circulator, a first coupler, an antenna, a transmission power detection circuit, a reception power detection circuit, a transmission flatness adjustment circuit, and a reception flatness adjustment circuit; the signal control processing module is connected to the input end of the transmission link and the output end of the reception link, the output end of the transmission link and the input end of the reception link are connected to the circulator, and the circulator is connected to the antenna through the first coupler; the input end and output end of the transmission power detection circuit are respectively connected to the first coupler and the signal control processing module, and the input end and output end of the reception power detection circuit are respectively connected to the second coupler in the reception link and the signal control processing module; the transmission flatness adjustment circuit is provided in the intermediate frequency band of the transmission link, and the reception flatness adjustment circuit is provided in the radio frequency band of the reception link.

[0025] like Figure 1 As shown, the transmit chain includes a transmit intermediate frequency (IF) filter amplifier circuit, a transmit frequency conversion circuit, a transmit RF filter circuit, and a transmit power amplifier circuit, connected in sequence. The receive chain includes a receive limiter low-noise amplifier circuit, a receive RF filter circuit, a receive frequency conversion circuit, a receive IF filter amplifier circuit, and a second coupler, connected in sequence. In this embodiment, the transmit flatness adjustment circuit is provided between the transmit IF filter amplifier circuit and the transmit frequency conversion circuit, and the receive flatness adjustment circuit is provided between the receive RF filter circuit and the receive frequency conversion circuit.

[0026] The signal control processing module generates a transmitting intermediate frequency signal according to the frequency point within the used frequency band; the transmitting intermediate frequency filtering and amplifying circuit is used to filter and amplify the transmitting intermediate frequency signal; the transmitting flatness adjustment circuit is used to adjust the gain flatness of the transmitting link according to the transmitting intermediate frequency signal after filtering and amplification; the transmitting frequency conversion circuit is used to up-convert the transmitting intermediate frequency signal to obtain a transmitting radio frequency signal; the transmitting radio frequency filtering circuit is used to filter the transmitting radio frequency signal; the transmitting power amplifying circuit is used to power amplify the transmitting radio frequency signal after filtering; the first coupler couples part of the energy for transmitting power detection; the circulator is used to achieve isolation and port synthesis of transmitting and receiving signals; and the transmitting power detection circuit is used to detect the transmitting power of the part of the energy coupled by the first coupler.

[0027] The receiving limiting low noise amplifier circuit is used to limit the amplitude of the received radio frequency signal and perform low-noise amplification; the receiving radio frequency filter circuit is used to filter the received radio frequency 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 radio frequency signal; the receiving frequency conversion circuit is used to down-convert the received radio frequency signal to obtain a received intermediate frequency signal; the receiving intermediate frequency filter amplifier circuit is used to filter and amplify the received intermediate frequency signal; the second coupler couples part of the energy for detecting the received power; and the receiving power detection circuit is used to detect the received power of the part of the energy coupled by the second coupler.

[0028] Couplers are designed at the ends of both the transmitting and receiving links to ensure low-loss transmission of normal signals while also coupling a very small amount of RF energy for power detection.

[0029] like Figure 2 As shown, both the transmit flatness adjustment circuit and the receive flatness adjustment circuit include multiple resonant units connected in parallel, each of which includes an RF switch and a resonant circuit connected in series. The RF switch, under the control of the signal control processing module, controls the gating function of the corresponding resonant circuit, offering advantages such as high frequency support, fast switching speed, low insertion loss, and low standing wave. The resonant circuit, used to generate a resonant frequency, exhibits varying insertion loss at different frequencies. In this embodiment, the resonant circuit employs an RLC resonant circuit, where R (resistance) adjusts the resonant circuit's Q value, altering the resonance depth and adjusting the degree of insertion loss variation at different frequencies.

[0030] The signal control processing module is configured to calculate the maximum transmit gain fluctuation for each switch state combination in the transmit flatness adjustment circuit based on the transmit power detected by the transmit power detection circuit, determine the optimal switch state combination for the transmit flatness adjustment circuit based on the maximum transmit gain fluctuation for all switch state combinations, and thereby control the RF switch state of the transmit flatness adjustment circuit. The signal control processing module is configured to calculate the maximum receive gain fluctuation for each switch state combination in the receive flatness adjustment circuit based on the receive power detected by the receive power detection circuit, determine the optimal switch state combination for the receive flatness adjustment circuit based on the maximum receive gain fluctuation for all switch state combinations, and thereby control the RF switch state of the receive flatness adjustment circuit. In this embodiment, the signal control processing module comprises an FPGA and a signal processing unit.

[0031] Based on multiple practical transceiver application scenarios, a wide frequency band is determined. The number of resonant units in the transmit and receive flatness adjustment circuits is determined based on this wide frequency band, enabling adjustment of transmit and receive gain flatness within this wide frequency band. Specifically, design and simulation are conducted based on this wide frequency band. The basic principle is to stagger the frequencies of the resonant units and vary the resonance depth in steps. The number and parameters of the resonant units are determined through simulation and actual debugging.

[0032] In this embodiment, the number of resonant units is five. Using the wider frequency band of 500MHz±100MHz as an example, a set of global parameters was simulated to achieve a gain flatness compensation of nearly 5dB within a 200MHz bandwidth. Assuming that only the narrower frequency band of 500MHz±10MHz is used in an actual application, the gain flatness compensation can be adjusted from 0.3dB to 1.3dB through software control. The specific switch state combinations are shown in Table 1.

[0033] Table 1 Gain flatness compensation values ​​for the 500MHz±10MHz frequency band Serial number The switching state of each resonant unit Compensation value of gain flatness within 20MHz bandwidth 1 The RF switches of the five resonant units are all closed 0.5dB 2 The RF switches of the 1st, 2nd, 4th and 5th resonant units are closed 0.3dB 3 The RF switches of the 3rd, 4th and 5th resonant units are closed 1dB 4 The RF switches of the 1st, 4th and 5th resonant units are closed 1.2dB 5 The RF switches of the second and third resonant units are closed 1.3dB The insertion loss of the emission flatness adjustment circuit under a certain switch state combination is simulated, and the obtained simulation curve is as follows: Figure 3 As shown. 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. This compensation capability can meet most application requirements; there is a gain flatness compensation of nearly 0.5dB within a bandwidth of 500MHz±10MHz. By adjusting the switch state, a gain flatness compensation of 0.3dB~1.3dB can be achieved within this bandwidth.

[0034] Adding a transmit flatness adjustment circuit and a receive flatness adjustment circuit to the transmit link and receive link, respectively, will cause gain loss in the transmit link and receive link. To solve this technical problem, the present invention adds a transmit gain adjustable amplifier and a receive gain adjustable amplifier to the transmit link and receive link, 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 transmit flatness adjustment circuit and the receive flatness adjustment circuit are distinguished by the direction of signal flow: the direction in which the signal flows out of the transmit flatness adjustment circuit is after the transmit flatness adjustment circuit, and the direction in which the signal flows 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.

[0035] The signal control processing module adjusts 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; and adjusts the receive gain adjustable amplifier according to 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.

[0036] The overall gain adjustment is performed by adding a transmit gain adjustable amplifier and a receive gain adjustable amplifier, which can meet both the gain requirement and the in-band gain flatness requirement.

[0037] The present invention sets the transmission flatness adjustment circuit at the intermediate frequency stage of the transmission link and the reception flatness adjustment circuit at the radio frequency stage of the reception link, and adopts a simple RLC resonant circuit compensation method to reduce cost and complexity. The use of a multi-stage resonant circuit parallel design can improve the adjustment accuracy within a wider bandwidth and achieve more refined gain flatness adjustment; by controlling the state of the radio frequency switch, the most suitable resonant unit can be independently selected for combination. The present invention couples and collects the transmission power and the reception power to form a negative feedback circuit, and automatically selects the optimal switch state combination based on the detected transmission power or reception power and in combination with software, thereby improving the gain flatness adjustment effect. The present invention can independently adjust individual product differences and can be used flexibly; it can be adjusted for specific frequency bands and can be used flexibly; it can make real-time adjustments to flatness changes caused by aging and other reasons.

[0038] Example 2 Based on the transceiver in the first embodiment, the gain flatness adjustment method of the transceiver provided by the present invention includes transmission gain flatness adjustment and reception gain flatness adjustment. Figure 4 As shown, the transmit gain flatness adjustment includes: Step A1: For each switch state combination in the transmission flatness adjustment circuit, the transmission power corresponding to different frequency points in the used frequency band is detected.

[0039] The number of switch state combinations is determined by the number of resonant units in the transmit gain flatness adjustment circuit. For example, if there are 5 resonant units, there are 32 switch state combinations.

[0040] For each frequency within the active frequency band, the transceiver's signal control and processing module generates a transmit IF signal based on that frequency. The transceiver's transmit chain processes the transmit IF signal and radiates it through the antenna. The transmit power detection circuit then measures the transmit power corresponding to each frequency. For example, within the active frequency band of 500MHz±10MHz, M frequencies are selected to generate transmit IF signals. Each frequency corresponds to a transmit IF signal and a transmit frequency, resulting in M ​​transmit powers for each switch state combination.

[0041] Step A2: Calculate the maximum transmission gain fluctuation under the corresponding switch state combination based on the transmission power corresponding to different frequency points in the used frequency band.

[0042] Select the maximum and minimum transmit powers corresponding to different frequencies within the frequency band; calculate the difference between the maximum and minimum transmit powers to obtain the maximum transmit gain fluctuation for the corresponding switch state combination. For example, for the frequency band of 500 MHz ± 10 MHz, select the maximum and minimum transmit powers from the M transmit powers for each switch state combination, and then calculate the maximum transmit gain fluctuation for that switch state combination.

[0043] Step A3: Determine the optimal switch state combination of the transmission flatness adjustment circuit according to the maximum transmission gain fluctuation under all switch state combinations.

[0044] The switching state combination corresponding to the minimum value of the maximum transmission gain fluctuation under all switching state combinations is the optimal switching state combination of the transmission flatness adjustment circuit.

[0045] Step A4: controlling the radio frequency switch state of the transmit flatness adjustment circuit according to the optimal switch state combination of the transmit flatness adjustment circuit to achieve gain flatness adjustment of the transmit link.

[0046] like Figure 5 As shown, the receive gain flatness adjustment includes: Step B1: For each switch state combination in the receiving flatness adjustment circuit, detect the receiving power corresponding to different frequency points in the used frequency band.

[0047] For each frequency point within the active frequency band, an additional reference source is required to generate a transmit intermediate frequency signal based on each frequency point. This transmit intermediate frequency signal is then processed and radiated to the transceiver via the antenna. The transceiver's receive link then receives and processes the reference source's radiated signal, and the received power detection circuit detects the received power at each frequency point. For example, for the active frequency band of 5500MHz±100MHz, M frequency points are selected and radiated to the transceiver via the reference source. Each frequency point corresponds to a radiated signal and a received frequency, resulting in M ​​received powers for each switch state combination.

[0048] Step B2: Calculate the maximum receiving gain fluctuation under the corresponding switch state combination based on the receiving power corresponding to different frequency points in the used frequency band.

[0049] Select the maximum and minimum received powers corresponding to different frequencies within the frequency band; calculate the difference between the maximum and minimum received powers to obtain the maximum receive gain fluctuation for the corresponding switch state combination. For example, for the frequency band of 5500 MHz ± 100 MHz, select the maximum and minimum received powers from the M received powers for each switch state combination, and then calculate the maximum receive gain fluctuation for that switch state combination.

[0050] Step B3: determining the optimal switch state combination of the reception flatness adjustment circuit according to the maximum reception gain fluctuation under all switch state combinations.

[0051] The switch state combination corresponding to the minimum value of the maximum receiving gain fluctuations under all switch state combinations is the optimal switch state combination of the receiving flatness adjustment circuit.

[0052] Step B4: controlling the radio frequency switch state of the receiving flatness adjustment circuit according to the optimal switch state combination of the receiving flatness adjustment circuit to achieve gain flatness adjustment of the receiving link.

[0053] When the frequency band of the transceiver changes, the gain flatness of the transmitting link and the receiving link is re-adjusted according to the gain flatness adjustment method of the present invention, which can cope with the gain flatness differences caused by different scene changes (such as environmental changes or aging) and improve adaptability.

[0054] In a specific embodiment of the present invention, a transmission gain adjustable amplifier is added between the transmission flatness adjustment circuit and the transmission frequency conversion circuit, and the transmission gain flatness adjustment further includes: Step A5: detecting the transmit power under the optimal switch state combination of the transmit flatness adjustment circuit; Step A6: adjusting 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.

[0055] In a specific embodiment of the present invention, a receiving gain adjustable amplifier is provided between the receiving intermediate frequency filter amplifier circuit and the second coupler, and the receiving gain flatness adjustment further includes: Step B5: detecting the received power under the optimal switch state combination of the receiving flatness adjustment circuit; Step B6: Adjust the adjustable receiving gain 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.

[0056] 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, meeting both gain requirements and in-band gain flatness requirements. This invention can automatically adjust gain flatness to address differences in gain flatness caused by varying scenarios, eliminating the need for manual intervention and significantly improving adjustment efficiency.

[0057] The above disclosure is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, and they should all be covered by the scope of protection of the present invention.

Claims

1. A transceiver comprising a signal control processing module, a transmission link, a reception link, a circulator, a first coupler, and an antenna, wherein the signal control processing module is connected to an input of the transmission link and an output of the reception link, the output of the transmission link and the input of the reception 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 of the transmit power detection circuit are respectively connected to the first coupler and the signal control processing module, and the input and output of the receive power detection circuit are respectively connected to the second coupler and the signal control processing module in the receive chain; the transmit flatness adjustment circuit is provided in the intermediate frequency band of the transmit chain, and the receive flatness adjustment circuit is provided in the radio frequency band of the receive chain; The transmission flatness adjustment circuit and the reception flatness adjustment circuit both include a plurality of resonance units connected in parallel, and each resonance unit includes a radio frequency switch and a resonance circuit connected in series.

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

3. The transceiver according to claim 1, wherein: The transmission link includes a transmission intermediate frequency filter amplifier circuit, a transmission frequency conversion circuit, a transmission radio frequency filter circuit and a transmission power amplifier circuit connected in sequence; The receiving chain includes a receiving amplitude 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 which are connected in sequence.

4. The transceiver according to claim 1, wherein: The transceiver further includes a transmission gain adjustable amplifier and a reception gain adjustable amplifier, wherein the transmission gain adjustable amplifier is arranged after the transmission flatness adjustment circuit, and the reception gain adjustable amplifier is arranged after the reception flatness adjustment circuit; The signal control processing module is further configured 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 an error range of the target transmit power; The device is also used to adjust the receiving gain adjustable amplifier according to the difference between the receiving power detected by the receiving power detection circuit and the target receiving power, so that the receiving power is within the error range of the target receiving 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 gain flatness of a transceiver, wherein the transceiver comprises a transmitting chain and a receiving chain, characterized in that: A transmission flatness adjustment circuit is added to the intermediate frequency band of the transmission link, and a reception flatness adjustment circuit is added to the radio frequency band of the reception link. The transmission flatness adjustment circuit and the reception flatness adjustment circuit each include a plurality of resonance units connected in parallel, and each resonance unit includes a radio frequency switch and a resonance circuit connected in series. The adjustment method includes: For each switch state combination in the transmit flatness adjustment circuit or the receive flatness adjustment circuit, detecting the transmit power or receive power corresponding to different frequency points within the frequency band; Calculate the maximum transmission gain fluctuation or the maximum reception gain fluctuation under the corresponding switch state combination according to the transmission power or reception power corresponding to different frequency points in the used frequency band; determining an optimal switch state combination of the transmit flatness adjustment circuit or the receive flatness adjustment circuit according to the maximum transmit gain fluctuation or the maximum receive gain fluctuation under all switch state combinations; The RF switch state of the transmission flatness adjustment circuit or the reception flatness adjustment circuit is controlled according to the optimal switch state combination of the transmission flatness adjustment circuit or the reception flatness adjustment circuit to achieve gain flatness adjustment of the transmission link or the reception link.

7. The method for adjusting gain flatness of a transceiver according to claim 6, wherein: Detect the transmit power corresponding to different frequency points within the frequency band, including: For each frequency point within the used frequency band, the signal control processing module of the transceiver generates a transmit intermediate frequency signal according to the frequency point; The transmitting intermediate frequency signal is processed by the transmitting link of the transceiver and then radiated outward through the antenna, and the transmitting power corresponding to the frequency point is detected; Detect the received power corresponding to different frequency points within the frequency band, including: For each frequency point within the used frequency band, a reference source is used to generate a radio frequency signal according to the frequency point and radiate the signal to the transceiver; The radiation signal of the reference source is received and processed by the receiving link of the transceiver, and the receiving power corresponding to the frequency point is detected.

8. The method for adjusting gain flatness of a transceiver according to claim 6, wherein: Calculate the maximum transmit gain fluctuation under the corresponding switch state combination based on the transmit power corresponding to different frequency points within the frequency band, specifically including: Select the maximum transmit power and the minimum transmit power among the transmit powers corresponding to different frequency points within the frequency band; Calculate the difference between the maximum transmit power and the minimum transmit power to obtain the maximum transmit gain fluctuation under the corresponding switch state combination; The maximum receive gain fluctuation under the corresponding switch state combination is calculated based on the receive power corresponding to different frequency points within the frequency band, specifically including: Select the maximum and minimum received powers among the received powers corresponding to different frequency points within the frequency band; The difference between the maximum received power and the minimum received power is calculated to obtain the maximum receive gain fluctuation under the corresponding switch state combination.

9. The method for adjusting gain flatness of a transceiver according to claim 6, wherein: The optimal switch state combination of the transmission flatness adjustment circuit refers to the switch state combination corresponding to the minimum value of the maximum transmission gain fluctuation under all switch state combinations; The optimal switch state combination of the receiving flatness adjustment circuit refers to the switch state combination corresponding to the minimum value of the maximum receiving gain fluctuations under all switch state combinations.

10. The method for adjusting gain flatness of a transceiver according to any one of claims 6 to 9, wherein: A transmitting gain adjustable amplifier is added after the transmitting flatness adjustment circuit, and a receiving gain adjustable amplifier is added after the receiving flatness adjustment circuit; The adjustment method further includes: detecting the transmit power or the receive power under an optimal switch state combination of the transmit flatness adjustment circuit or the receive flatness adjustment circuit; Adjust the adjustable 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 adjustable 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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