Multi-frequency amplification device

Abstract

The invention discloses a multi-frequency amplification device. The multi-frequency amplification device comprises a plurality of narrowband input amplification modules, a plurality of power supply change-over switches and a broadband output amplification module, each input end of each narrowband input amplification module receives each input signal; the output ends of the narrowband input amplification modules share a compound contact; each narrowband input amplification module is connected with the input end of the broadband output amplification module through the reconnection point; the output end of the broadband output amplification module outputs signals of different frequency bands; and each power supply change-over switch is correspondingly connected with the power supply end of each narrowband input amplification module and is used for controlling and switching any narrowband input amplification module to work. According to the scheme, the insertion loss of each narrowband input amplification module is reduced, and each narrowband input amplification module can meet the conditions of signal gating and matching optimization in the respective working frequency band, so that the output power, efficiency and amplification gain of the multi-frequency amplification device are improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communication technology, and in particular to a multi-frequency amplification device. Background Art

[0002] A multi-frequency amplifier is a device that can amplify within multiple frequency ranges. Compared with traditional single-frequency amplifiers, multi-frequency amplifiers have higher flexibility and adaptability, and can operate at different frequencies to meet a variety of communication and application requirements. Multi-frequency amplifiers are widely used in various modern communication systems, such as CDMA, GSM, LTE, UWB and other technologies, and are also an important part of wireless LAN applications such as WiFi, Bluetooth, Zigbee, etc. In addition, multi-frequency amplifiers are also used in miniaturized power amplifier designs, which have special practical value.

[0003] Figure 1 It is a schematic diagram of the structure of a broadband power amplifier device in the prior art; as shown in FIG1 , the conventional broadband power amplifier device adopts multiple narrowband power amplifier modules 001; each narrowband power amplifier module 001 includes a multi-stage narrowband power amplifier module 01 and a control switch 02; each control switch 02 shares an output pin; thus, the control switch 02 can control the narrowband power amplifier module 01 of the corresponding frequency band to output an amplified signal; thus, a wider frequency range of the broadband power amplifier device is achieved. However, the use of a control switch will increase the insertion loss of each narrowband power amplifier module, thereby affecting the output power, efficiency and amplification gain of the broadband power amplifier device. Summary of the invention

[0004] The present invention provides a multi-frequency amplifier device to reduce the insertion loss of each narrow-band input amplifier module, so that each narrow-band input amplifier module can meet the conditions of signal selection and matching optimization in its respective working frequency band, thereby improving the output power, efficiency and amplification gain of the multi-frequency amplifier device.

[0005] To achieve the above objectives, an embodiment of the present invention provides a multi-frequency amplification device, which includes: a plurality of narrowband input amplification modules, a plurality of power supply switching switches and a broadband output amplification module;

[0006] Each input end of each narrowband input amplification module receives each input signal; each output end of each narrowband input amplification module shares a multiple connection point; each narrowband input amplification module is connected to the input end of the broadband output amplification module through the multiple connection point; the output end of the broadband output amplification module outputs signals of different frequency bands;

[0007] Each of the power switching switches is correspondingly connected to a power supply end of each of the narrow-band input amplifying modules, and is used to control the switching of any of the narrow-band input amplifying modules to operate.

[0008] Optionally, each of the narrowband input amplification modules includes a narrowband input matching unit, at least one stage of input amplifier and at least one narrowband inter-stage matching unit;

[0009] The narrowband input matching unit is arranged at the input end of the first-stage input amplifier; and the narrowband inter-stage matching unit is arranged between the input amplifiers of each stage.

[0010] Optionally, the broadband output amplification module includes an output amplifier and a broadband output matching unit;

[0011] The input end of the output amplifier is connected to the multiple connection point; the output end of the output amplifier is connected to the input end of the broadband output matching unit; and the output end of the broadband output matching unit outputs signals of different frequency bands.

[0012] Optionally, each of the power switching switches includes: a switching transistor.

[0013] Optionally, each of the power switching switches includes: a power switch control circuit.

[0014] Optionally, a plurality of the power switching switches are integrated with the narrowband input amplification module.

[0015] Optionally, the power switch corresponding to the narrowband input amplification module includes a first power switch sub-switch; each of the narrowband inter-stage matching units includes an inter-stage choke inductor and an inter-stage matching capacitor;

[0016] In the narrowband interstage matching unit of the last stage, the first end of the interstage choke inductor is electrically connected to the voltage source through the corresponding first power supply switching sub-switch; the second end of the interstage choke inductor is electrically connected to the output end of the input amplifier of the previous stage and the first end of the interstage matching capacitor; the second end of the interstage matching capacitor is connected to the input end of the broadband output amplification module;

[0017] In other narrowband inter-stage matching units, the first end of the inter-stage choke inductor is electrically connected to a voltage source.

[0018] Optionally, the power switch corresponding to the narrowband input amplification module includes a plurality of second power switch sub-switches; each of the narrowband inter-stage matching units includes an inter-stage choke inductor and an inter-stage matching capacitor;

[0019] The first end of the inter-stage choke inductor is electrically connected to the voltage source through the second power switching sub-switch; the second end of the inter-stage choke inductor is electrically connected to the output end of the input amplifier of the previous stage and the first end of the inter-stage matching capacitor; the second end of the inter-stage matching capacitor is connected to the input end of the input amplifier of the next stage.

[0020] Optionally, the broadband output matching unit includes: an output choke inductor and a transformer;

[0021] The first end of the output choke inductor is connected to the output end of the output amplifier; the second end of the output choke inductor is connected to a DC voltage source; the output end of the output amplifier is connected to the input end of the transformer; the output end of the transformer serves as the output end of the broadband output matching unit.

[0022] Optionally, each of the narrowband input matching units includes an input matching inductor and an input matching capacitor;

[0023] The first end of the input matching inductor serves as the input end of the narrowband input matching unit and is connected to the first end of the input matching capacitor; the second end of the input matching capacitor is grounded; and the second end of the input matching inductor is connected to the input end of the first-stage amplifier.

[0024] In the embodiment of the present invention, each output end of each narrowband input amplifying module shares a multiple connection point, and each power switching switch can control the switching of any narrowband input amplifying module to work. In this way, when the input end of any narrowband input amplifying module receives an input signal of a frequency band, the corresponding power switching switch can control the switching of any narrowband input amplifying module to work, and the other narrowband input amplifying modules are disconnected. Since the other narrowband input amplifying modules are equivalent to a parasitic capacitor when disconnected, the output signal of the working narrowband input amplifying module is less affected. In this way, the narrowband input amplifying module can meet the conditions of signal selection and matching optimization, and the broadband output amplifying module can output the signal of the corresponding frequency band due to its large frequency band range; that is, each output end shares a multiple connection point, and the insertion loss of each narrowband input amplifying module is reduced by the power switching switch, so that the influence between each channel amplifying module is less, thereby improving the output power, efficiency and amplification gain of the multi-frequency amplifying device.

[0025] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the structure of a broadband power amplifier device in the prior art;

[0028] Figure 2 It is a structural schematic diagram of a multi-frequency amplification device provided by an embodiment of the present invention;

[0029] Figure 3 is a specific circuit diagram of another multi-frequency amplifying device provided by an embodiment of the present invention;

[0030] Figure 4 is a specific circuit diagram of a multi-frequency amplification device provided by an embodiment of the present invention;

[0031] Figure 5 is a specific circuit diagram of another multi-frequency amplifying device provided by an embodiment of the present invention;

[0032] Figure 6 It is a specific circuit diagram of another multi-frequency amplifying device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] Figure 2 is a schematic diagram of the structure of a multi-frequency amplification device provided by an embodiment of the present invention, such as Figure 2As shown, the multi-frequency amplification device includes: a plurality of narrowband input amplification modules 10, a plurality of power switching switches 20 and a broadband output amplification module 30; each input end of each narrowband input amplification module 10 receives each input signal; each output end of each narrowband input amplification module 10 shares a multiple connection point A; each narrowband input amplification module 10 is connected to the input end of the broadband output amplification module 30 through the multiple connection point A; the output end of the broadband output amplification module 30 outputs signals of different frequency bands; each power switching switch 20 is correspondingly connected to the power supply end of each narrowband input amplification module 10, and is used to control the switching of any narrowband input amplification module 10 to work.

[0036] Each power switch 20 may include a switch transistor (such as an NMOS transistor, a PMOS transistor, a transmission gate, an SOI switch transistor, a pHEMT switch transistor); or may include a power switch control circuit; the power switch control circuit may specifically be a VCC power management circuit that adjusts the VCC voltage value to achieve similar power supply path switching; this embodiment does not specifically limit the type of the power switch 20;

[0037] Each narrowband input amplifier module 10 is a driving module that can output a signal in a certain narrow frequency range, and provides driving capability for the broadband output amplifier module 30; the broadband output amplifier module 30 is an amplifier module that can output a wide frequency band signal, and can output a signal with a relatively high power;

[0038] In this embodiment, each output end of each narrowband input amplifying module 10 shares a multiple connection point A, and each power switching switch 20 can control and switch any narrowband input amplifying module 10 to work. In this way, when the input end of any narrowband input amplifying module 10 receives an input signal of the first narrow frequency band, the corresponding power switching switch 20 can control and switch any narrowband input amplifying module 10 to work, and other narrowband input amplifying modules 10 are disconnected. Since other narrowband input amplifying modules 10 are equivalent to a parasitic capacitor when disconnected, the output signal of the working narrowband input amplifying module 10 is less affected. In this way, the narrowband input amplifying module 10 can meet the conditions of signal selection and matching optimization, and can output the signal of the first narrow frequency band. If the input end of another narrowband input amplifying module 10 receives the input signal of the second narrow frequency band, the corresponding power switching switch 20 can control and switch any narrowband input amplifying module 10 to work, and other narrowband input amplifying modules 10 are disconnected. Since other narrowband input amplifying modules 10 are disconnected, they are equivalent to a parasitic capacitor, and have little effect on the output signal of the working narrowband input amplifying module 10. In this way, the narrowband input amplifying module 10 can meet the conditions of signal selection and matching optimization, and can output the signal of the first narrow frequency band. When a signal of a certain frequency band is input, the corresponding power switching switch 20 can control the switching of another narrowband input amplifier module 10 to work, and the corresponding other narrowband input amplifier modules 10 are disconnected. Since the other narrowband input amplifier modules 10 are equivalent to a parasitic capacitor when they are disconnected, the output signal of the working narrowband input amplifier module 10 is less affected. In this way, the narrowband input amplifier module 10 can meet the conditions of signal selection and matching optimization, and can output the signal of the second narrow frequency band, thus realizing the ultra-large bandwidth of the multi-frequency amplifier device; at the same time, by sharing a complex junction A at each output end, and reducing the insertion loss of each narrowband input amplifier module 10 through the power switching switch 20, the influence of each channel amplifier module on each other is less, thereby improving the output power, efficiency and amplification gain of the multi-frequency amplifier device.

[0039] In addition, it should be noted that in this embodiment, each narrowband input amplification module 10 outputs signals of different frequency bands through a broadband output amplification module 30, which can reduce the cost and area of ​​the overall multi-frequency amplification device, and avoid the cost increase problem caused by the prior art that each narrowband input amplification module 10 is provided with multiple narrowband output amplification modules. Of course, it can be understood that since the multi-stage input amplification modules 10 of the multi-frequency amplification device are all narrowband input amplification modules 10, the output of each frequency band can also meet the requirements of out-of-band suppression and low amplifier noise.

[0040] Optionally, based on the above embodiment, each module is further refined. Figure 3 is a schematic diagram of the structure of another multi-frequency amplification device provided by an embodiment of the present invention. Figure 3 As shown, each narrowband input amplification module 10 includes a narrowband input matching unit 11, at least one stage input amplifier 12 and at least one narrowband inter-stage matching unit 13; the narrowband input matching unit 11 is arranged at the input end of the first stage input amplifier 12; the narrowband inter-stage matching unit 13 is arranged between each stage input amplifier 12.

[0041] Among them, each narrowband input amplification module 10 may include a multi-stage input amplifier 12, so that the driving capability can be improved; this embodiment does not specifically limit the number of stages of the multi-stage input amplifier 12; the narrowband input matching unit 11 can match the input end of the first-stage input amplifier 12 with the output end of the narrow-band input signal source to ensure that the narrow-band input signal can be efficiently transmitted to the first-stage input amplifier. The narrowband inter-stage matching unit 13 can match the output end of the front-stage input amplifier with the input end of the rear-stage input amplifier to ensure that the signal can maintain a high efficiency when transmitted between amplifiers at each stage without excessive reflection and distortion. The narrowband input matching unit 11 and the narrowband inter-stage matching unit 13 can use a π-type or T-type network, which is not specifically limited in this embodiment.

[0042] Optional, continue to refer to Figure 3 The broadband output amplification module 30 includes an output amplifier 31 and a broadband output matching unit 32; the input end of the output amplifier 31 is connected to the multiple junction A; the output end of the output amplifier 31 is connected to the input end of the broadband output matching unit 32; the output end of the broadband output matching unit 32 outputs signals of different frequency bands. Among them, the broadband output matching unit 32 can match the output end of the output amplifier 31 with the load to ensure that the signals of each narrow frequency band outputted from the output end of the output amplifier 31 can be efficiently transmitted to the load. Of course, it can be understood that the broadband output matching unit 32 can adopt a π-type or T-type network, and the specific composition of the broadband output matching unit 32 is not limited in this embodiment.

[0043] Optional, continue to refer to Figure 2 and 3 The multiple power switching switches 20 are integrated with each narrowband input amplifying module 10. The multiple power switching switches 20 are integrated with each narrowband input amplifying module 10, which can effectively reduce the design cost of the multiple power switching switches 20 and each narrowband input amplifying module.

[0044] Optional, Figure 4 is a specific circuit diagram of another multi-frequency amplifying device provided by an embodiment of the present invention, such as Figure 4As shown, the power switching switch 20 corresponding to the narrowband input amplification module 10 includes a first power switching sub-switch 21, and each narrowband interstage matching unit 13 includes an interstage choke inductor L1 and an interstage matching capacitor C1; in the last-stage narrowband interstage matching unit 13, the first end of the interstage choke inductor L1 is electrically connected to the voltage source VCC through the first power switching sub-switch 21; the second end of the interstage choke inductor L1 is electrically connected to the output end of the previous input amplifier 12 and the first end of the interstage matching capacitor C1; the second end of the interstage matching capacitor C1 is connected to the input end of the output amplifier 31; in other narrowband interstage matching units 13, the first end of the interstage choke inductor L1 is electrically connected to the voltage source VCC.

[0045] Among them, the inter-stage choke inductor L1 and the inter-stage matching capacitor C1 can play a good role in narrow-band inter-stage impedance matching; at the same time, the inter-stage choke inductor L1 is connected to the voltage source VCC through the corresponding power supply switching switch 20, or directly, and the choke inductor L1 can also provide a power supply path for the DC power supply; the broadband frequency output of the multi-frequency amplifier device is described below in combination with the specific structure of each narrow-band inter-stage matching unit 13;

[0046] When the input end of a narrowband input amplifier module 10 receives an input signal of the first narrow frequency band, the first power switching sub-switch 21 corresponding to the narrowband input amplifier module 10 is turned on, while the first power switching sub-switches 21 corresponding to other narrowband input amplifier modules 10 are turned off (the equivalent resistance of the first power switching sub-switches 21 is in the order of hundreds of kilo-ohms to several mega-ohms), so that the DC power is output to the inter-stage choke inductor L1 and the inter-stage matching capacitor C1 corresponding to the last-stage narrowband inter-stage matching unit 13 in the narrowband input amplifier module 10, and the narrowband input amplifier module 10 works accordingly; while the DC power in other narrowband input amplifier modules 10 cannot be output to the corresponding ones of other narrowband input amplifier modules 10 Choke inductor L1 and inter-stage matching capacitor C1, so that other narrow-band input amplifying modules 10 cannot work; when other narrow-band input amplifying modules 10 cannot work, each input amplifier 12 in other narrow-band input amplifying modules 10 is in a biased state, in this state each input amplifier 12 is equivalent to a parasitic capacitor, and the parasitic capacitance value is small, so that each input amplifier 12 has little effect on the working narrow-band input amplifying module 10, so that the narrow-band input amplifying module 10 can meet the conditions of signal selection and matching optimization, and can output signals in a specific narrow frequency band; the input end of other narrow-band input amplifying modules 10 can also receive signals in other frequency bands, thus realizing the ultra-large bandwidth of the multi-frequency amplifying device.

[0047] Optional, Figure 5 is a specific circuit diagram of another multi-frequency amplifying device provided by an embodiment of the present invention, such as Figure 5As shown, the power switching switch 20 corresponding to the narrowband input amplification module 10 includes a plurality of second power switching sub-switches 22, and each narrowband interstage matching unit 13 includes an interstage choke inductor L1 and an interstage matching capacitor C1; in each narrowband interstage matching unit 13, the first end of the interstage choke inductor L1 is electrically connected to the voltage source VCC through the second power switching sub-switch 22; the second end of the interstage choke inductor L1 is electrically connected to the output end of the front-stage input amplifier 12 and the first end of the interstage matching capacitor C1; the second end of the interstage matching capacitor C1 is connected to the input end of the rear-stage input amplifier 12.

[0048] In some other embodiments, when the input end of a narrowband input amplifying module 10 receives an input signal of a first narrow frequency band, each second power switching sub-switches 22 corresponding to the narrowband input amplifying module 10 is turned on, while each second power switching sub-switches 22 corresponding to other narrowband input amplifying modules 10 is turned off, so that the narrowband input amplifying module 10 can work while other narrowband input amplifying modules 10 cannot work; in this way, when other narrowband input amplifying modules 10 cannot work, each input amplifier 12 in the other narrowband input amplifying modules 10 is equivalent to a parasitic capacitor, so that each input amplifier 12 has little effect on the working narrowband input amplifying module 10, so that the narrowband input amplifying module 10 can meet the conditions of signal selection and matching optimization, and can output a signal in a specific narrow frequency band.

[0049] Optional, continue to refer to Figure 4-5 The broadband output matching unit 32 includes: an output choke inductor L2 and a transformer L3; the first end of the output choke inductor L2 is connected to the output end of the output amplifier 31; the second end of the output matching capacitor C2 is connected to the DC voltage source VCC; the output end of the output amplifier 31 is connected to the input end of the transformer L3; the output end of the transformer L3 serves as the output end of the broadband output matching unit 32. The output choke inductor L2 and the transformer L3 can well play the role of output impedance matching to ensure that the signals of each narrow frequency band outputted from the output end of the output amplifier 31 can be efficiently transmitted to the load.

[0050] Optional, Figure 6 is a specific circuit diagram of another multi-frequency amplifying device provided by an embodiment of the present invention, such as Figure 6 As shown, each narrowband inter-stage matching unit 13 further includes a decoupling capacitor C0; the first end of the decoupling capacitor C0 is connected to the first end of the choke inductor L1 through the corresponding power switching switch 20; the second end of the decoupling capacitor C0 is grounded. The decoupling capacitor C0 can filter the voltage source VCC in the inter-stage matching unit, thereby providing a stable voltage source for the inter-stage matching unit.

[0051] Optional, continue to refer to Figure 6Each narrowband input matching unit includes an input matching inductor L4 and an input matching capacitor C2; the first end of the input matching inductor L4 is used as the input end of the narrowband input matching unit 11, and is connected to the first end of the input matching capacitor C2; the second end of the input matching capacitor C2 is grounded; the second end of the input matching inductor L4 is connected to the input end of the first-stage input amplifier 12. Among them, the input matching inductor L4 and the input matching capacitor C2 can play a good role in input impedance matching, so as to ensure that the narrow-band input signal can be efficiently transmitted to the first-stage input amplifier.

[0052] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A multi-frequency amplification device, characterized in that: include: Multiple narrowband input amplification modules, multiple power supply switches and broadband output amplification modules; Each input end of each narrowband input amplification module receives each input signal; each output end of each narrowband input amplification module shares a multiple connection point; each narrowband input amplification module is connected to the input end of the broadband output amplification module through the multiple connection point; the output end of the broadband output amplification module outputs signals of different frequency bands; Each of the power switching switches is correspondingly connected to a power supply end of each of the narrow-band input amplifying modules, and is used to control the switching of any of the narrow-band input amplifying modules to operate.

2. The multi-frequency amplification device according to claim 1, characterized in that: Each of the narrowband input amplification modules comprises a narrowband input matching unit, at least one stage of input amplifier and at least one narrowband inter-stage matching unit; The narrowband input matching unit is arranged at the input end of the first-stage input amplifier; and the narrowband inter-stage matching unit is arranged between the input amplifiers of each stage.

3. The multi-frequency amplification device according to claim 1, characterized in that: The broadband output amplification module includes an output amplifier and a broadband output matching unit; The input end of the output amplifier is connected to the multiple connection point; the output end of the output amplifier is connected to the input end of the broadband output matching unit; and the output end of the broadband output matching unit outputs signals of different frequency bands.

4. The multi-frequency amplification device according to claim 1, characterized in that: Each of the power switching switches includes a switching transistor.

5. The multi-frequency amplification device according to claim 1, characterized in that: Each of the power switching switches includes a power switch control circuit.

6. The multi-frequency amplification device according to claim 1, characterized in that: The plurality of power switching switches are integrated with the narrowband input amplification module.

7. The multi-frequency amplification device according to claim 2, characterized in that: The power switch corresponding to the narrowband input amplification module includes a first power switch sub-switch; each narrowband inter-stage matching unit includes an inter-stage choke inductor and an inter-stage matching capacitor; In the narrowband interstage matching unit of the last stage, the first end of the interstage choke inductor is electrically connected to the voltage source through the corresponding first power supply switching sub-switch; the second end of the interstage choke inductor is electrically connected to the output end of the input amplifier of the previous stage and the first end of the interstage matching capacitor; the second end of the interstage matching capacitor is connected to the input end of the broadband output amplification module; In other narrowband inter-stage matching units, the first end of the inter-stage choke inductor is electrically connected to a voltage source.

8. The multi-frequency amplification device according to claim 2, characterized in that: The power switch corresponding to the narrowband input amplification module includes a plurality of second power switch sub-switches; each of the narrowband inter-stage matching units includes an inter-stage choke inductor and an inter-stage matching capacitor; The first end of the inter-stage choke inductor is electrically connected to the voltage source through the second power switching sub-switch; the second end of the inter-stage choke inductor is electrically connected to the output end of the input amplifier of the previous stage and the first end of the inter-stage matching capacitor; the second end of the inter-stage matching capacitor is connected to the input end of the input amplifier of the next stage.

9. The multi-frequency amplification device according to claim 3, characterized in that: The broadband output matching unit includes: an output choke inductor and a transformer; The first end of the output choke inductor is connected to the output end of the output amplifier; the second end of the output choke inductor is connected to a DC voltage source; the output end of the output amplifier is connected to the input end of the transformer; the output end of the transformer serves as the output end of the broadband output matching unit.

10. The multi-frequency amplification device according to claim 2, characterized in that: Each of the narrowband input matching units includes an input matching inductor and an input matching capacitor; The first end of the input matching inductor serves as the input end of the narrowband input matching unit and is connected to the first end of the input matching capacitor; the second end of the input matching capacitor is grounded; and the second end of the input matching inductor is connected to the input end of the first-stage amplifier.

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