Radio frequency transceiver device, automatic tuning method and broadband radio frequency communication system

Abstract

The present invention provides a radio frequency transceiver device, an automatic tuning method and a broadband radio frequency communication system. The radio frequency transceiver device includes a preamplifier and a regulation unit. The preamplifier includes two cascaded narrowband amplifiers and two amplifier loads respectively connected to each narrowband amplifier as loads. Each amplifier load is provided with a variable component for adjusting the frequency and roll-off coefficient of the corresponding narrowband amplifier. The maximum gains of the two narrowband amplifiers are equal, and the frequency response curves of the two narrowband amplifiers are superimposed to form the frequency response curve of the preamplifier. The regulation unit adjusts the parameters of the variable components in each amplifier load based on the current channel of the communication system to adjust the frequency and roll-off coefficient of each narrowband amplifier, so that the bandwidth of the preamplifier matches the current channel of the communication system and each frequency point within the bandwidth of the preamplifier has equal or approximate gain.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication, and particularly to a radio frequency transceiver device, an automatic tuning method, and a broadband radio frequency communication system. Background Art

[0002] With the development of communication technologies, high-frequency and broadband application technical solutions have become increasingly important. Broadband communication methods such as WIFI6, 5G communication, and UWB have entered people's lives. However, with the increase in frequency and bandwidth, the requirements for communication circuits are getting higher and higher. Traditional narrowband technical solutions have become increasingly unable to meet the requirements of communication systems. The advent of broadband systems poses a huge challenge to design. While obtaining high frequency and large bandwidth, it is also necessary to meet requirements such as system noise and out-of-band rejection. To achieve good noise and out-of-band rejection, it is necessary to narrow the bandwidth as much as possible during application. This pair of contradictory problems has a greater impact on the performance of the system due to the structural characteristics and non-adjustability of the circuit itself in traditional broadband solutions; especially in the presence of interference signals, due to the undifferentiated amplification of broadband circuits, that is, signals within the current channel of the system and signals outside the current channel are amplified synchronously, thus greatly deteriorating the noise and out-of-band rejection performance of the system.

[0003] Furthermore, compared with traditional narrowband amplifiers, broadband amplifiers are more difficult to implement in circuits. Firstly, broadband matching requires a large area; secondly, the current consumed by broadband circuits is huge, and a very long time is often required to optimize the design in order to obtain good technical performance. Obviously, this high optimization cost and large chip area are often unacceptable in the field of high-performance and low-cost integrated circuits. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a radio frequency transceiver device, an automatic tuning method, and a broadband radio frequency communication system based on a combination of narrowband amplifiers to achieve compatibility between the required broadband characteristics and out-of-band rejection.

[0005] To achieve the above object, the present invention provides a radio frequency transceiver device, which includes a pre-amplifier and a regulation unit. The pre-amplifier includes two cascaded narrowband amplifiers and two amplifier loads respectively connected to each narrowband amplifier as loads. Each amplifier load has variable components for adjusting the frequency and roll-off coefficient of the corresponding narrowband amplifier. The maximum gains of the two narrowband amplifiers are equal, and the frequency response curves of the two narrowband amplifiers are superimposed to form the frequency response curve of the pre-amplifier. The regulation unit adjusts the parameters of the variable components in each amplifier load based on the current channel of the communication system to adjust the frequency and roll-off coefficient of each stage of the narrowband amplifier, so that the bandwidth of the pre-amplifier matches the current channel of the communication system and each frequency point within the bandwidth of the pre-amplifier has equal or nearly equal gain.

[0006] According to an embodiment of the present invention, the bandwidth of the communication system is divided into multiple channels according to the bandwidth of the pre-amplifier, and the parameters of the variable components in the amplifier load corresponding to each channel are formed into a parameter configuration set and stored; when the communication system works on a certain channel again, the regulation unit obtains the parameter configuration set corresponding to the channel from the storage area and writes it into the corresponding amplifier load.

[0007] According to an embodiment of the present invention, in the pre-amplifier, the first-stage narrowband amplifier is a low-pass filter, the second-stage narrowband amplifier is a band-pass amplifier, and the frequency band between the inflection point frequency of the first-stage narrowband amplifier and the center frequency of the second-stage narrowband filter forms the bandwidth of the pre-amplifier.

[0008] According to an embodiment of the present invention, the amplifier load connected to the first-stage narrowband amplifier is a resistor feedback load, and the amplifier load connected to the second-stage narrowband amplifier is an LC load.

[0009] According to an embodiment of the present invention, the resistor feedback load includes a variable feedback resistor R1, switching transistors M1, M2, and a variable current source I1; the variable current source I1, switching transistors M1, M2 are connected in series between the power supply and the first package ground in sequence, the radio frequency input is connected to the series connection point of the switching transistors M1, M2 through the variable feedback resistor R1, and the controls of the two switching transistors M1, M2 are connected; the variable feedback resistor R1 and the variable current source I1 are adjusted based on a control instruction to change the inflection point frequency and roll-off coefficient of the low-pass amplifier.

[0010] According to an embodiment of the present invention, the LC load includes a capacitor array C1, a tunable inductor L1, a variable resistor R2, and switching transistors M3 and M4; the tunable inductor L1 and the variable resistor R2 are connected in series and then connected in parallel with the capacitor array C1 to form an adjustment module, and the adjustment module is connected to the band-pass amplifier through the series-connected switching transistors M4, M3, and the second package ground wire, and the connection point between the adjustment module and the switching transistor M4 forms a radio frequency output; the capacitor array C1 and the tunable inductor L1 are adjusted based on a control instruction to change the center frequency of the band-pass amplifier, and the variable resistor R2 is adjusted to change the roll-off coefficient on the low-frequency side of the band-pass amplifier.

[0011] According to an embodiment of the present invention, the radio frequency transceiver device further includes a variable current bias circuit connected between two amplifier loads, and the variable current bias circuit adjusts the absolute gain of the subsequent narrow-band amplifier.

[0012] On the other hand, the present invention also provides an automatic tuning method for a radio frequency transceiver device, which includes:

[0013] Dividing the bandwidth of the communication system into multiple channels according to the bandwidth of the pre-stage amplifier;

[0014] Based on the current channel of the communication system, adjusting the parameters of the variable components in each amplifier load in the pre-stage amplifier to adjust the frequency and roll-off coefficient of each narrow-band amplifier, so that the bandwidth of the pre-stage amplifier matches the current channel of the communication system and each frequency point within the bandwidth of the pre-stage amplifier has equal or approximate gain;

[0015] When the communication system switches channels, adjust the frequency and roll-off coefficient of each narrow-band amplifier again following the switched current channel.

[0016] According to an embodiment of the present invention, the parameters of the variable components in the amplifier load corresponding to each channel in the communication system are formed into a parameter configuration set in advance and stored; when the communication system works on a certain channel again, obtain the parameter configuration set corresponding to the channel from the storage area and write it into the corresponding amplifier load.

[0017] On the other hand, the present invention also provides a broadband radio frequency communication system, which includes the above-mentioned radio frequency transceiver device and a mixer.

[0018] In summary, the radio frequency transceiver device, automatic tuning method, and broadband radio frequency communication system provided by the present invention form a pre-stage amplifier by cascading and superimposing two narrowband amplifiers. The control unit adjusts the frequency and roll-off coefficient of each narrowband amplifier based on the current channel of the communication system, so that the bandwidth of the pre-stage amplifier matches the current channel of the communication system, realizing the amplification of the effective signal within the current channel while suppressing the signal outside the channel due to incomplete amplification. The adjustment of the roll-off coefficient makes the gain at each frequency point within the amplifier bandwidth equal or close in the frequency response curve formed by the superposition of the two narrowband filters, that is, a flat broadband characteristic is obtained within the current channel. Further, the bandwidth of the communication system is divided into multiple channels according to the bandwidth of the pre-stage amplifier, and the frequency and roll-off coefficient of the narrowband amplifier in the pre-stage amplifier are adjusted for each channel, so that the communication system can have good in-band amplification and out-of-band suppression characteristics in each channel, and while being compatible with the broadband communication system matching, it well realizes the narrowband communication advantages of effective in-band amplification and out-of-band suppression; that is, the performance compatibility of large bandwidth and low noise is achieved simultaneously.

[0019] In addition, the broadband communication system implemented based on the narrowband amplifier greatly reduces the chip area and the current consumed by the chip during operation. At the same time, it is also more conducive to the optimization of broadband performance and reduces the optimization cost.

[0020] To make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is the existing broadband radio frequency communication system and the frequency response curve corresponding to each node.

[0022] Figure 2 Shown is the circuit principle block diagram of the radio frequency transceiver device provided by an embodiment of the present invention.

[0023] Figure 3 Shown Figure 2 is a schematic diagram after the superposition of the frequency response curves of the two narrowband amplifiers in the pre-stage amplifier.

[0024] Figure 4 Shown is a partial enlarged schematic diagram after the superposition of the frequency response curves of the two narrowband amplifiers.

[0025] Figure 5 Shown is Figure 2 the specific circuit structure schematic diagram of the loads of the two amplifiers.

[0026] Figure 6 Shown is the frequency response curve after the simple cascade of the traditional two amplifiers.

[0027] Figure 7 The figure shows a schematic structural diagram of a broadband radio frequency communication system provided by an embodiment of the present invention.

[0028] Figure 8 The figure shows a schematic flow diagram of an automatic tuning method for a radio frequency transceiver device provided by an embodiment of the present invention. Detailed implementation manners

[0029] In Figure 1 , both the first-stage amplifier and the second-stage amplifier are traditional broadband amplifiers, which are used to amplify the signals received by the antenna. It can be seen from their frequency responses that the traditional broadband amplifier amplifies the signals within the bandwidth (BW) without discrimination. In Figure 1 , the total bandwidth of the signal is the BW range described by the arrow, but when the communication system is working, only one channel of the bandwidth is occupied, and n channels are represented by Ch1~Chn. When the current communication selects Ch1, ideally, the signals within the bandwidths of Ch2~Chn do not actually need to be amplified. If they are amplified without discrimination, more noise will enter the system, deteriorating the signal-to-noise ratio of the system. In addition, the pre-stage amplifier formed based on the broadband amplifier also has problems such as large chip area, large required working current, and performance optimization; that is, the traditional broadband radio frequency communication system cannot simultaneously obtain the performance of large bandwidth, low noise, high gain, and low cost.

[0030] In view of this, as Figures 2 to 6 shown, this embodiment provides a radio frequency transceiver device, which includes a pre-stage amplifier 10 and a regulation unit 20. The pre-stage amplifier 10 includes two cascaded narrowband amplifiers A1 and A2, and two amplifier loads 11 and 12 respectively connected to each narrowband amplifier as loads. Each amplifier load is provided with variable components for adjusting the frequency and roll-off coefficient of the corresponding narrowband amplifier. The maximum gains Gm of the two-stage narrowband amplifiers A1 and A2 are equal, and the frequency response curves of the two-stage narrowband amplifiers A1 and A2 are superimposed to form the frequency response curve of the pre-stage amplifier 10. The regulation unit 20 adjusts the parameters of the variable components in each amplifier load based on the current channel of the communication system to adjust the frequency and roll-off coefficient of each stage of the narrowband amplifier, so that the bandwidth of the pre-stage amplifier 10 matches the current channel of the communication system and each frequency point within the bandwidth of the pre-stage amplifier 10 has equal or approximate gain.

[0031] In this embodiment, the narrowband amplifier A1 at the first stage in the preamplifier 10 is a low-pass amplifier, and the amplifier load connected thereto is a resistive feedback load RI; the narrowband amplifier A2 at the second stage is a band-pass amplifier, and the amplifier load connected thereto is an LC load LC1. However, the present invention makes no limitation thereto. In other embodiments, the narrowband amplifier A1 at the first stage may also be a band-pass amplifier, and the narrowband amplifier at the second stage may be a high-pass amplifier. After the regulation unit 20 adjusts the parameters of the two amplifier loads based on the current channel of the communication system, the bandwidth of the preamplifier 10 formed by the frequency band between the corner frequency (corner freq1) of the narrowband amplifier A1 and the center frequency (freq2) of the narrowband amplifier A2 matches the current channel of the communication system. Further, at any frequency point within the range from corner freq1 to freq2, the gains are equal or close. The term "close" means that the difference between the actual gain of the frequency points in this region and the superimposed preset gain does not exceed 1 dB. However, the present invention makes no limitation thereto. In actual optimization design, the parameters of the variable components can be continuously adjusted to make the gains of all frequency points within the range from corner freq1 to freq2 infinitely close, so as to form a relatively flat band-pass characteristic within the range from corner freq1 to freq2.

[0032] Figure 6 The figure shows the frequency response curve after the simple cascade of two traditional narrowband amplifiers. Among them, the curve L01 is the frequency response curve of the low-pass amplifier, the curve L02 is the frequency response curve of the band-pass amplifier with an LC load; the curve L03 is the frequency response curve after the superposition of the two. It can be seen from the figure that the maximum gain Gm of the frequency response curves of the two narrowband amplifiers is 10 dB, and the gains at the overlapping parts are both 8 dB; therefore, in the curve L03 obtained after the two-stage narrowband amplifiers are cascaded together, the gains at the leftmost and rightmost sides are both 10 + 1 = 11 dB, and the gain at the middle overlapping part is 16 dB. It can be seen that the simple cascade of two narrowband amplifiers cannot constitute a broadband amplifier, that is, it is impossible to achieve the broadband characteristic that the gains at all frequency points within the required channel are equal or close.

[0033] In this embodiment, the adjustment of the roll-off coefficient of each narrowband amplifier is introduced while performing frequency tuning. The roll-off coefficient is closely related to the rising and falling rates of the edges in the frequency response curve of the narrowband amplifier. Figure 3 and Figure 4 The figure shows the superimposed frequency response curve of the two narrowband amplifiers in the preamplifier in this embodiment after the frequency and roll-off coefficient are adjusted. In Figure 3 , (a) is the frequency response curve of the narrowband amplifier A1, (b) is the frequency response curve of the narrowband amplifier A2; (c) is the frequency response curve after the superposition of the two. Figure 4It is a partial enlarged schematic diagram of (c). Figure 4 In it, the curve L11 is the frequency response curve of the low-pass amplifier of the amplifier A1 as the first stage, and the curve L12 is the frequency response curve of the band-pass amplifier A2 with an LC load; the curve L13 is the frequency response curve after the superposition of the two. After adjustment, the descending rate on the right side of the curve L11 is made consistent with the ascending rate on the left side of the curve 12 so that the gains at the overlapping places of the two are added up to 11 db. And the sum of the gains at the corner frequency (cornerfreq1) of the low-pass amplifier is also 11 db; at the center frequency freq2 of the band-pass amplifier, the sum of the gains of the two is also 11 db. In this way, within the entire frequency band from corner freq1 to freq2, a relatively flat band-pass characteristic can be obtained. And the frequency band from corner freq1 to freq2 obtained after the frequency following response adjustment is the current channel of the communication system, so as to realize that the effective signals within the current channel of the communication system are uniformly amplified, while the out-of-band signals are not fully amplified and thus suppressed.

[0034] The frequency adjustment within the preamplifier 10 based on the current channel of the communication system enables the preamplifier 10 to amplify the effective signals within the current channel of the communication system, while the out-of-band signals are well suppressed due to incomplete amplification, realizing the performance requirement of low noise. And the adjustment of the roll-off coefficient enables good broadband characteristics within the bandwidth of the preamplifier 10. The signals within the current channel are all amplified without difference and have good gain performance, thus obtaining the characteristics of low noise and high gain. Further, according to the bandwidth of the preamplifier 10, the bandwidth of the communication system is divided into multiple channels, and the preamplifier 10 adopts a configuration combination of an amplifier load parameter for each channel to realize the broadband characteristic of low noise, so that the entire communication system has good broadband characteristics.

[0035] Figure 8 The figure shows a schematic flow diagram of the automatic tuning method of the radio frequency transceiver device provided by an embodiment of the present invention. Combining Figure 8 The automatic tuning method of the radio frequency transceiver device given in this embodiment is introduced. Its working principle is as follows: Step S10, divide the bandwidth of the communication system into multiple channels according to the bandwidth of the preamplifier 10 (the bandwidth from corner freq1 to freq2). For example, when the communication signal bandwidth is 1G and the bandwidth that the preamplifier 10 can achieve is 250M; then the communication signal bandwidth can be divided into four channels for implementation, namely Ch1, Ch2, Ch3 and Ch4. When the broadband communication system operates in a certain channel (such as Ch1) within the bandwidth, step S20 is executed, and the control unit 20 will adjust the parameters of the variable components in the two load amplifiers, so that the frequencies corner freq1, freq2 and the roll-off coefficient of the two narrow-band amplifiers A1, A2 satisfy Figure 4The requirements shown. When the channel of the communication system is adjusted to another channel, such as Ch2, step S20 is executed, and the frequencies corner freq1, freq2 and the roll-off coefficients of each narrowband amplifier A1, A2 are adjusted again following the switched current channel Ch2.

[0036] In this embodiment, the parameters of the variable components in the amplifier load corresponding to each channel are formed into a parameter configuration set and stored; for example, the parameter configuration set corresponding to channel Ch1 is S1, the parameter configuration set corresponding to channel Ch2 is S1, and the parameter configuration set corresponding to channel Chn is Sn. The parameter configuration sets S1~Sn are pre-stored after being formed. When the communication system works on a certain channel again, the control unit 20 can obtain the parameter configuration set corresponding to this channel from the storage area and write it into the corresponding amplifier load.

[0037] In this embodiment, the control unit 20 is a phase-locked loop circuit connected to the mixer. The phase-locked loop circuit includes a voltage-controlled oscillator and a self-calibration module. When the circuit topology, transistor size, and capacitor array of the LC load LC1 connected to the narrowband amplifier A2 are the same as those of the voltage-controlled oscillator, the value of the capacitor array control word after the local oscillator calibration output of the voltage-controlled oscillator can be used as a control instruction, and the corresponding parameter configuration set can be matched from the storage area with this control instruction as the keyword and written into the corresponding amplifier load. However, the structure of the control unit of the present invention is not limited in any way. In other embodiments, the control unit can also obtain the parameter configuration set corresponding to the current channel by querying the index table after obtaining the current channel of the system.

[0038] Figure 5 The following shows a schematic diagram of the specific circuit structure of two amplifier loads in the preamplifier. The resistor feedback load RI includes a variable feedback resistor R1, switching transistors M1, M2, and a variable current source I1. The variable current source I1, and the switching transistors M1, M2 are connected in series between the power supply and the first package ground wire CND1 in sequence. The RF input IN is connected to the series connection point of the switching transistors M1, M2 through the variable feedback resistor R1, and the control electrodes of the two switching transistors M1, M2 are connected. Specifically, when the current output by the variable current source I1 is smaller and the variable feedback resistor R1 is larger, then in Figure 4 corner freq1 moves more towards the low-frequency direction ( Figure 4 the left side of the coordinate system in and the falling rate on the right side of the curve L11 will increase. On the contrary, when the current output by the variable current source I1 is larger and the variable feedback resistor R1 is smaller, corner freq1 moves more towards the high-frequency direction and the falling rate on the right side of the curve will decrease. Therefore, the control unit 20 will configure the parameters of the variable current source I1 and the variable feedback resistor R1 in the resistor feedback load RI based on this adjustment rule to achieve that the frequency of the narrowband amplifier A1 follows the response change of the current channel and the roll-off coefficient meetsFigure 4 The broadband characteristics requirements shown. In addition, broadband matching of impedance can be achieved by further optimizing the sizes of the variable feedback resistor R1, the variable current source I1, and the first package ground wire GND1. This method can be achieved without off-chip components. And if the RF input port IN is connected by bonding wires, very good broadband characteristics can also be achieved through adjustment of the design.

[0039] For the LC load LC1, it includes a capacitor array C2, an adjustable inductor L2, a variable resistor R2, and switching transistors M3 and M4. The adjustable inductor L2 and the variable resistor R2 are connected in series and then in parallel with the capacitor array C3 to form an adjustment module. The adjustment module is connected to the band-pass amplifier through the series-connected switching transistors M4, M3, and the second package ground wire GND2. The connection point between the adjustment module and the switching transistor M4 forms the RF output OUT. The control unit 20 adjusts the capacitor array C2 and the adjustable inductor L2 based on the current channel to change the center frequency of the narrow-band amplifier A2, and adjusts the variable resistor R2 to change the roll-off coefficient on the low-frequency side of the narrow-band amplifier A2. That is, the capacitor array C2 and the adjustable inductor L2 are used to achieve a large range of frequency adjustment, the variable resistor R2 is used to adjust the roll-off coefficient of the narrow-band amplifier A2 at different frequency points, and the variable current bias circuit 13 is used to adjust the absolute gain of the narrow-band amplifier A2, so as to achieve the optimal superposition of the gain curves of the two-stage amplifier and meet the requirements of broadband characteristics. In this embodiment, no specific current structure of the variable current bias circuit is limited, and any circuit that can achieve the current bias requirement to change the absolute gain of the narrow-band amplifier A2 is acceptable.

[0040] At the same time, the parameters of the adjusted variable current source I1, variable feedback resistor R1, capacitor array C2, adjustable inductor L2, variable resistor R2, and variable current bias circuit 13 are formed into a parameter configuration set corresponding to the current channel.

[0041] Correspondingly, as Figure 7 shown, this embodiment also provides a broadband RF communication system, which includes the above-mentioned RF transceiver device 100, mixer 200, phase-locked loop circuit as the control unit 20, filter 300, VGA 400, and ADC 500.

[0042] In summary, in the radio frequency transceiver device, automatic tuning method, and broadband radio frequency communication system provided by the present invention, two cascaded narrowband amplifiers are used to form a preamplifier. The regulation unit adjusts the frequency and roll-off coefficient of each narrowband amplifier based on the current channel of the communication system, so that the bandwidth of the preamplifier matches the current channel of the communication system, realizing the amplification of the effective signal within the current channel while suppressing the signal outside the channel due to incomplete amplification. The adjustment of the roll-off coefficient makes the gain of each frequency point within the amplifier bandwidth close to or equal in the frequency response curve formed by the superposition of the two narrowband filters, that is, a flat broadband characteristic is obtained within the current channel. Further, according to the bandwidth of the preamplifier, the bandwidth of the communication system is divided into multiple channels, and the frequency and roll-off coefficient of the narrowband amplifier in the preamplifier are adjusted for each channel, so that the communication system can have good in-band amplification and out-of-band suppression characteristics in each channel, realizing the narrowband communication advantages of effective in-band amplification and out-of-band suppression while being compatible with the broadband communication system matching; that is, the performance compatibility of large bandwidth and low noise is achieved simultaneously.

[0043] In addition, the broadband communication system matching achieved based on the narrowband amplifier greatly reduces the chip area and the current consumed by the chip during operation, and is also more conducive to the optimization of broadband performance and the reduction of optimization costs.

[0044] Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in this art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope claimed in the claims.

Claims

1. A radio frequency transceiver device, characterized in that, Comprising: A preamplifier, including two cascaded narrowband amplifiers and two amplifier loads respectively connected to each narrowband amplifier as loads. Each amplifier load has variable components for adjusting the frequency and roll-off coefficient of the corresponding narrowband amplifier. The maximum gains of the two narrowband amplifiers are equal, and the frequency response curves of the two narrowband amplifiers are superimposed to form the frequency response curve of the preamplifier; A regulation unit that adjusts the parameters of the variable components in each amplifier load based on the current channel of the communication system to adjust the frequency and roll-off coefficient of each narrowband amplifier, so that the bandwidth of the preamplifier matches the current channel of the communication system and each frequency point within the bandwidth of the preamplifier has equal or nearly equal gain. "Nearly equal" means that the difference between the actual gain and the superimposed preset gain of the frequency points in the area does not exceed 1 dB; The bandwidth of the communication system is divided into multiple channels according to the bandwidth of the preamplifier, and the frequency and roll-off coefficient of the narrowband amplifier in the preamplifier are adjusted for each channel, so that the communication system has in-band amplification and out-of-band suppression characteristics in each channel.

2. The radio frequency transceiver device according to claim 1, wherein The bandwidth of the communication system is divided into multiple channels according to the bandwidth of the preamplifier, and the parameters of the variable components in the amplifier load corresponding to each channel are formed into a parameter configuration set and stored; When the communication system works in a certain channel again, the regulation unit obtains the parameter configuration set corresponding to the channel from the storage area and writes it into the corresponding amplifier load.

3. The radio frequency transceiver device according to claim 1, characterized in that In the preamplifier, the first-stage narrowband amplifier is a low-pass filter, the second-stage narrowband amplifier is a band-pass amplifier, and the frequency band between the inflection point frequency of the first-stage narrowband amplifier and the center frequency of the second-stage narrowband filter forms the bandwidth of the preamplifier.

4. The radio frequency transceiver device according to claim 3, characterized in that The amplifier load connected to the first-stage narrowband amplifier is a resistor feedback load, and the amplifier load connected to the second-stage narrowband amplifier is an LC load.

5. The radio frequency transceiver device according to claim 3, wherein, The resistor feedback load includes a variable feedback resistor R1, switching transistors M1, M2, and a variable current source I1; The variable current source I1, switching transistors M1, and M2 are connected in series between the power supply and the first package ground wire in sequence. The RF input is connected to the series connection point of the switching transistors M1 and M2 through the variable feedback resistor R1, and the control phases of the two switching transistors M1 and M2 are connected; The variable feedback resistor R1 and the variable current source I1 are adjusted based on the control instruction to change the inflection point frequency and roll-off coefficient of the low-pass amplifier.

6. The RF transceiver device according to claim 4, wherein The LC load includes a capacitor array C1, an adjustable inductor L1, a variable resistor R2, and switching transistors M3, M4; The adjustable inductor L1 and the variable resistor R2 are connected in series and then connected in parallel with the capacitor array C1 to form an adjustment module. The adjustment module is connected to the band-pass amplifier through the series-connected switching transistors M4, M3, and the second package ground wire. The connection point between the adjustment module and the switching transistor M4 forms the RF output; The capacitor array C1 and the adjustable inductor L1 are adjusted based on the control instruction to change the center frequency of the band-pass amplifier, and the variable resistor R2 is adjusted to change the roll-off coefficient on the low-frequency side of the band-pass amplifier.

7. The RF transceiver device according to claim 1, characterized in that, The radio frequency transceiver device further includes a variable current bias circuit connected between two amplifier loads, and the variable current bias circuit adjusts the absolute gain of the subsequent narrowband amplifier.

8. An automatic tuning method for a radio frequency transceiver device as claimed in claim 1, characterized in that, Comprising: Dividing the bandwidth of the communication system into multiple channels according to the bandwidth of the pre-stage amplifier; Based on the current channel of the communication system, adjusting the parameters of the variable components in each amplifier load within the pre-stage amplifier to adjust the frequency and roll-off coefficient of each narrowband amplifier, so that the bandwidth of the pre-stage amplifier matches the current channel of the communication system and each frequency point within the bandwidth of the pre-stage amplifier has equal or nearly equal gain. "Nearly equal" means that the difference between the actual gain of the frequency points in the area and the superimposed preset gain does not exceed 1 dB; dividing the bandwidth of the communication system into multiple channels according to the bandwidth of the pre-stage amplifier, and adjusting the frequency and roll-off coefficient of the narrowband amplifier within the pre-stage amplifier for each channel, so that the communication system has in-band amplification and out-of-band suppression characteristics in each channel; After the communication system switches channels, adjust the frequency and roll-off coefficient of each narrowband amplifier again following the switched current channel.

9. The automatic tuning method of the radio frequency transceiver device according to claim 8, characterized in that, Pre-form a parameter configuration set of the parameters of the variable components in the amplifier load corresponding to each channel in the communication system and store it; when the communication system works on a certain channel again, obtain the parameter configuration set corresponding to the channel from the storage area and write it into the corresponding amplifier load.

10. A broadband radio frequency communication system, characterized in that, Comprising the radio frequency transceiver device according to any one of claims 1 to 7 and a mixer.

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