Power amplification module of UHF wave band and transmitting assembly

Abstract

The utility model discloses a UHF wave band power amplification module and a transmitting assembly, the power amplification module comprises a signal input end, the signal input end is connected with the input end of a band-pass filter, the output end of the band-pass filter is connected with the input end of a first-stage power amplifier, and the output end of the first-stage power amplifier is connected with the output end of a second-stage power amplifier. The output end of the first-stage power amplifier is connected with the input end of the second-stage power amplifier, the output end of the second-stage power amplifier is connected with the input end of the third-stage power amplifier, and the output end of the third-stage power amplifier is connected with the input end of the isolator. The output end of the isolator is connected with the input end of the final-stage power amplifier; the power amplification module adopts a four-stage power amplification mode, the third-stage power amplifier and the last-stage power amplifier adopt LDMOS power amplifiers, and radio frequency signals in the UHF wave band can be amplified from 0dBm to about 500W to be output. As the power amplification module is small in structure, the power amplification module can be used independently and can also be used as a transmitting channel in a TR assembly.

Description

Technical Field

[0001] The utility model relates to the field of power amplifiers, in particular to a UHF band power amplifier module and a transmitting component. Background Art

[0002] Ultra-high frequency (UHF) refers to radio waves with a wavelength range of 1m~1dm and a frequency of 300~3000MHz. It is commonly used in mobile communications and broadcasting and television. Due to the long communication distance of this band, a high-power amplifier is required to amplify the signal. The existing UHF band power amplifiers are generally complex in structure and require multiple power amplification components to amplify the power to the ideal power. Therefore, they are all used in conjunction with transmitters and have low flexibility. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a power amplifier module with a compact structure, which can be used alone or as a transmitting channel in a TR component.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a UHF band power amplifier module on the one hand, including a signal input end, the signal input end is connected to the input end of a bandpass filter, the output end of the bandpass filter is connected to the input end of a first-stage power amplifier, the output end of the first-stage power amplifier is connected to the input end of a second-stage power amplifier, the output end of the second-stage power amplifier is connected to the input end of a third-stage power amplifier, the output end of the third-stage power amplifier is connected to the input end of an isolator, and the output end of the isolator is connected to the input end of a final-stage power amplifier.

[0005] Optionally, the working state of the final stage power amplifier is a class C power amplifier.

[0006] Optionally, a p-type attenuation circuit is further arranged between the first-stage power amplifier and the second-stage power amplifier, the input end of the p-type attenuation circuit is connected to the output end of the first-stage power amplifier, and the output end of the p-type attenuation circuit is connected to the input end of the second-stage power amplifier.

[0007] Optionally, the gain of the first-stage power amplifier is 15-16dB.

[0008] Optionally, the gain of the second-stage power amplifier is 16-17dB.

[0009] Optionally, the gain of the third-stage power amplifier is 15-16dB.

[0010] Optionally, the first-stage power amplifier and the second-stage power amplifier use InGaP power tubes.

[0011] Optionally, the third-stage power amplifier and the final-stage power amplifier are LDMOS power tubes.

[0012] Optionally, the model of the final stage power amplifier is BLF978P.

[0013] On the other hand, the utility model also provides a UHF band transmitting component, including a power amplifier module recorded in any of the above technical solutions, wherein the output end of the power amplifier module is connected to a circulator and a coupler in sequence, and the output end of the coupler is connected to an antenna.

[0014] The utility model has the following beneficial effects compared with the prior art: the power amplifier module uses a four-stage power amplification method, wherein the third-stage power amplifier and the final-stage power amplifier use LDMOS power amplifiers, and can amplify the radio frequency signal in the UHF band from 0 dBm to about 500 W output. Since the power amplifier module has a compact structure, the module can be used alone or as a transmitting channel in a TR component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a UHF band power amplifier module provided by an embodiment of the utility model;

[0016] Figure 2 and Figure 3 It is a circuit schematic diagram of a first-stage power amplifier and a second-stage power amplifier provided in one embodiment of the utility model;

[0017] Figure 4 It is a PCB structure diagram of a third-stage amplifier and a final-stage amplifier provided in one embodiment of the utility model. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model 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 numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0020] In the description of this specification, the description of reference terms such as "embodiment", "some embodiments" and "optional embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or exemplary implementation of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0021] Reference Figure 1 The present embodiment provides a UHF band power amplifier module, comprising a signal input terminal RFin, for inputting a UHF band radio frequency signal, the signal input terminal is connected to the input terminal of a band pass filter, the output terminal of the band pass filter is connected to the input terminal of a first-stage power amplifier, the output terminal of the first-stage power amplifier is connected to the input terminal of a second-stage power amplifier, the output terminal of the second-stage power amplifier is connected to the input terminal of a third-stage power amplifier, the output terminal of the third-stage power amplifier is connected to the input terminal of an isolator, and the output terminal of the isolator is connected to the input terminal of a final-stage power amplifier.

[0022] The power amplifier module provided in this embodiment adopts a four-stage power amplifier to amplify the radio frequency signal, wherein the first two stages of the power amplifier are InGaP power tubes and the last two stages of the power amplifier are LDMOS power tubes.

[0023] In this embodiment, the front end of the amplification module is a bandpass filter to ensure the frequency spectrum characteristics of the input signal of the amplification module.

[0024] like Figure 2 and Figure 3 As shown, in this embodiment, the first-stage power amplifier is SBB3089, and the gain of this stage of amplifier in the component operating frequency band is 16dB, and the saturated output power is about 20dBm. The amplifier model used in the second-stage power amplifier is TQP7M9102, and the gain of this amplifier is 17dB, and P1dB is about 28dBm. The main function of this stage of amplifier is to amplify the RF signal to a 28dBm saturated amplification output. In order to prevent the second-stage amplifier from being over-saturated, adjust the gain, and avoid self-excitation, a p-type attenuation circuit is built between the first two amplifiers using chip resistors.

[0025] like Figure 4 As shown, in this embodiment, the third-stage power amplifier is MRFE6VS25N, the gain of the amplifier in the working frequency band is 16dB, and the saturation power P1dB is about 44dBm. The function of the amplifier is to amplify the RF signal to the saturation power output and provide sufficient RF energy for the final amplifier. At the same time, as the third stage, the power amplifier working in the saturation state is conducive to the stability of the overall working state of the power amplifier module.

[0026] In this embodiment, the power amplifier used in the final stage of the power amplifier module is BLF978P. This power tube is a typical bipolar push-pull LDMOS power tube. The working state of the final power tube is a Class C power amplifier. In this working state, the power tube gain will be small, but the total output power remains unchanged. The final power tube will amplify the RF signal given by the third stage to about 58dBm for output. In order to ensure the isolation between the final stage and the third stage, and to ensure the working state and efficiency of each power tube, an isolator is added between the final power amplifier and the third power amplifier to ensure the standing wave of each power tube and avoid mutual interference between the front and rear stages of the matching circuit.

[0027] In another embodiment, the utility model further provides a UHF band transmitting component, which includes the UHF band power amplifier module recorded in any of the above embodiments. The signal output by the final power amplifier of the power amplifier module is output to the antenna after passing through a circulator and a coupler, and the total output power is approximately 57.5dBm (560W).

[0028] The power amplifier module uses a four-stage power amplification method, in which the third-stage power amplifier and the final-stage power amplifier use LDMOS power amplifiers, which can amplify the UHF band RF signal from 0dBm to about 500W output. Due to the compact structure of the power amplifier module, the module can be used alone or as a transmitting channel in the TR component.

[0029] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A UHF band power amplifier module, comprising a signal input end, characterized in that: The signal input end is connected to the input end of the bandpass filter, the output end of the bandpass filter is connected to the input end of the first-stage power amplifier, the output end of the first-stage power amplifier is connected to the input end of the second-stage power amplifier, the output end of the second-stage power amplifier is connected to the input end of the third-stage power amplifier, the output end of the third-stage power amplifier is connected to the input end of the isolator, and the output end of the isolator is connected to the input end of the final-stage power amplifier.

2. The power amplifier module according to claim 1, characterized in that: The working state of the final stage power amplifier is a class C power amplifier.

3. The power amplifier module according to claim 1, characterized in that: A p-type attenuation circuit is also provided between the first-stage power amplifier and the second-stage power amplifier, the input end of the p-type attenuation circuit is connected to the output end of the first-stage power amplifier, and the output end of the p-type attenuation circuit is connected to the input end of the second-stage power amplifier.

4. The power amplifier module according to claim 1, characterized in that: The gain of the first-stage power amplifier is 15-16dB.

5. The power amplifier module according to claim 1, characterized in that: The gain of the second-stage power amplifier is 16-17dB.

6. The power amplifier module according to claim 1, characterized in that: The gain of the third-stage power amplifier is 15-16dB.

7. The power amplifier module according to claim 1, characterized in that: The first-stage power amplifier and the second-stage power amplifier use InGaP power tubes.

8. The power amplifier module according to claim 1 or 5, characterized in that: The third-stage power amplifier and the final-stage power amplifier are LDMOS power tubes.

9. The power amplifier module according to claim 1, characterized in that: The model of the final stage power amplifier is BLF978P.

10. A UHF band transmitting component, characterized in that: It comprises a power amplifier module as described in any one of claims 1 to 9, wherein the output end of the power amplifier module is connected to a circulator and a coupler in sequence, and the output end of the coupler is connected to an antenna.

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