High-isolation power amplifier circuit and device capable of resisting power supply interference

Abstract

The utility model discloses a high-isolation power amplifier circuit and device capable of resisting power supply interference, and relates to the technical field of power amplifier circuits. According to the utility model, the temperature compensation unit, the first amplification unit, the equalization unit, the second amplification unit and the third amplification unit are sequentially arranged in the power amplification circuit, so that an input radio frequency signal transmitted by the input end of the power amplification circuit is firstly subjected to temperature compensation, shunt power amplification blocking synthesis, equalization gain and amplification isolation operation; and meanwhile, the negative voltage control unit is used for controlling the power supply end of the power amplifier circuit, so that stable power supply of each stage of power amplifier unit in the power amplifier circuit is ensured. And the defect that a power amplifier circuit in the prior art is easily interfered by a power supply or other signals is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of power amplifier circuits, in particular to a high-isolation power amplifier circuit and a device that is resistant to power supply interference. Background Art

[0002] As a technical means of performing signal power amplification processing on radio frequency signals, the power amplifier circuit is easily affected by the influence of the upper working unit or power supply interference when performing power amplification processing on radio frequency signals, resulting in poor power amplification effect on radio frequency signals and easily affecting the power amplification effect. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcoming of the prior art that the power amplifier circuit is easily interfered by the power supply or other signals, and to propose a high-isolation power amplifier circuit and device that are resistant to power supply interference.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] In a first aspect, the utility model provides a high-isolation power amplifier circuit resistant to power supply interference, comprising:

[0006] a temperature compensation unit, the temperature compensation unit being electrically connected to the input end of the power amplifier circuit, and the temperature compensation unit being used to perform temperature compensation on an input radio frequency signal transmitted from the input end of the power amplifier circuit;

[0007] a first amplifying unit, the first amplifying unit being connected to the temperature compensating unit, and dividing the input RF signal into equal parts, removing the DC signal, amplifying the signal, and then re-synthesizing the signal;

[0008] an equalizing unit, the equalizing unit being electrically connected to the output end of the first amplifying unit, and configured to perform gain adjustment at different frequency points within a bandwidth on the input RF signal processed by the first amplifying unit;

[0009] a second amplifying unit, the second amplifying unit being electrically connected to the equalizing unit, and configured to amplify the input RF signal after being amplified by the equalizing unit;

[0010] a third amplifying unit, the third amplifying unit being electrically connected to the second amplifying unit, and configured to amplify the input RF signal processed by the second amplifying unit, thereby improving the isolation between the amplifying units at each stage, and also improving the anti-total reflection capability of the front-stage power amplifier module;

[0011] A negative voltage control unit, one end of the negative voltage control unit is electrically connected to the power supply end of the power amplifier circuit, and the other end of the negative voltage control unit is electrically connected to the first amplifying unit, the second amplifying unit, and the third amplifying unit respectively. The negative voltage control unit is used to stabilize the current at the power supply end and stabilize the power supply to the first amplifying unit, the second amplifying unit, and the third amplifying unit according to the set power supply timing.

[0012] In some feasible solutions, the first amplification unit includes:

[0013] a first bridge connected to the temperature compensation unit via a DC blocking capacitor, and configured to divide the input RF signal processed by the temperature compensation unit into two equal parts;

[0014] Two power amplifier tubes, the input ends of the two power amplifier tubes being electrically connected to the first bridge respectively, so as to enable the two power amplifier tubes to amplify the input radio frequency signal split into two parts;

[0015] The second bridge is electrically connected to the other ends of the two power amplifier tubes through two DC blocking capacitors, and the second bridge is used to synthesize the two input RF signals that have been amplified by the two power amplifier tubes.

[0016] In some feasible solutions, the third amplification unit includes:

[0017] a circulator, the circulator having three pins, one pin of the circulator being electrically connected to the second amplifying unit via a DC blocking capacitor;

[0018] A power amplifier tube, the power amplifier tube being electrically connected to the second pin of the circulator;

[0019] A ceramic load is electrically connected to the three pins of the circulator.

[0020] In some feasible solutions, the negative pressure control unit includes:

[0021] A plurality of ground capacitors, wherein the plurality of ground capacitors are respectively arranged at the input and output ends of the voltage stabilizing circuit;

[0022] wherein the capacitance values ​​of the plurality of ground capacitors are different;

[0023] A voltage stabilizing circuit, one end of the voltage stabilizing circuit is electrically connected to the power supply module and the negative pressure control unit through multiple capacitors to ground, and the other end of the voltage stabilizing circuit is electrically connected to the first amplifying unit, the second amplifying unit, and the third amplifying unit through multiple capacitors to ground.

[0024] In some feasible solutions, the voltage stabilizing circuit includes: a voltage stabilizing diode.

[0025] In some feasible solutions, the temperature compensation unit includes: a temperature compensation attenuator.

[0026] In some feasible solutions, the balancing unit includes: an equalizer.

[0027] In a second aspect, the utility model provides a high-isolation power amplifier device resistant to power supply interference, which adopts any one of the high-isolation power amplifier circuits resistant to power supply interference described in the first aspect.

[0028] The beneficial effects of the utility model are:

[0029] The present invention sequentially arranges a temperature compensation unit, a first amplifying unit, an equalizing unit, a second amplifying unit, and a third amplifying unit in the power amplifier circuit. This allows the input radio frequency signal transmitted through the input end of the power amplifier circuit to first undergo temperature compensation, split power amplifier DC isolation synthesis, equalization gain, and amplification isolation operations. Simultaneously, a negative voltage control unit is used to control the power supply end of the power amplifier circuit to ensure stable power supply to each level of the power amplifier circuit. This solves the disadvantage of the prior art that the power amplifier circuit is easily interfered with by the power supply or other signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a high-isolation power amplifier circuit structure that is resistant to power supply interference provided in an embodiment of the present utility model;

[0031] Figure 2 This is a circuit diagram of a high-isolation power amplifier circuit structure that is resistant to power supply interference provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] Example

[0037] Reference Figures 1 to 2To address the shortcomings of prior art power amplifier circuits, which are susceptible to interference from power supplies or other signals, the present invention provides a high-isolation power amplifier circuit that is resistant to power supply interference. The power amplifier circuit includes a temperature compensation unit, a first amplifying unit, an equalizing unit, a second amplifying unit, a third amplifying unit, and a negative voltage control unit. The temperature compensation unit is electrically connected to the input of the power amplifier circuit and is used to temperature compensate the input RF signal transmitted from the input of the power amplifier circuit to ensure that the input RF signal meets the temperature compensation requirements of subsequent multi-stage power amplifiers. The first amplifying unit is connected to the temperature compensation unit via a DC blocking capacitor and divides the input RF signal into equal parts, removes the DC signal, amplifies it, and then re-synthesizes it. The equalizing unit is electrically connected to the output of the first amplifying unit and is used to gain the input RF signal processed by the first amplifying unit at different frequencies within the bandwidth. The second amplifying unit is electrically connected to the equalizing unit and is used to amplify the input RF signal after gain by the equalizing unit. The third amplifier unit is electrically connected to the second amplifier unit. On the one hand, the third amplifier unit is used to amplify the input RF signal processed by the second amplifier unit, and on the other hand, it improves the isolation between the amplifier units of each level, and also improves the anti-total reflection capability of the front-stage power amplifier module. Since power amplifier tubes are provided between the first amplifier unit, the second amplifier unit, and the third amplifier unit in the front-stage power amplifier module, especially when GaN power amplifier tubes are used, the power amplifier tubes have strict requirements on the power-on sequence of the gate voltage and the drain voltage. Therefore, a negative voltage control unit is also required. One end of the negative voltage control unit is electrically connected to the power supply end of the power amplifier circuit, and the other end of the negative voltage control unit is electrically connected to the first amplifier unit, the second amplifier unit, and the third amplifier unit respectively. The negative voltage control unit is used to stabilize the current at the power supply end and stabilize the power supply to the first amplifier unit, the second amplifier unit, and the third amplifier unit according to the set power supply sequence. In this embodiment, a temperature compensation unit, a first amplifying unit, an equalizing unit, a second amplifying unit, and a third amplifying unit are sequentially provided in the power amplifier circuit. Therefore, the input RF signal transmitted through the input end of the power amplifier circuit is first subjected to temperature compensation, split power amplifier DC isolation synthesis, gain equalization, and amplification isolation operations. Simultaneously, a negative voltage control unit is used to control the power supply end of the power amplifier circuit to ensure stable power supply to each power amplifier unit in the power amplifier circuit. This overcomes the disadvantage of the prior art that the power amplifier circuit is susceptible to interference from the power supply or other signals.

[0038] In this embodiment, the input RF signal entering the second amplifying unit is ensured to be stable. The first amplifying unit includes: two power amplifier tubes, a first bridge, and a second bridge. The first bridge is connected to the temperature compensation unit through a DC blocking capacitor, and is used to divide the input RF signal processed by the temperature compensation unit into two equal parts. The input ends of the two power amplifier tubes are respectively electrically connected to the first bridge, so that the two power amplifier tubes can respectively amplify the input RF signal divided into two parts. The second bridge is electrically connected to the other ends of the two power amplifier tubes through two DC blocking capacitors, and the second bridge is used to synthesize the two input RF signals that have been amplified by the two power amplifier tubes, so as to realize signal integration and filtering of the DC signal of the input RF signal after being processed by it. This can then ensure the stability of the subsequent signal power amplification.

[0039] Specifically, the third amplifying unit includes a circulator, a ceramic load, and a power amplifier tube. The circulator has three pins, one of which is electrically connected to the second amplifying unit via a DC-blocking capacitor. The power amplifier tube is electrically connected to the second pin of the circulator. The ceramic load is electrically connected to the third pin of the circulator. By adding the circulator and its ceramic load to the third amplifying unit, the isolation between the various amplifying units can be improved, while also enhancing the anti-total reflection capability of the preceding power amplifier module.

[0040] In this embodiment, in order to ensure that the negative pressure control unit can normally provide stable voltage and power supply to the first amplifying unit, the second amplifying unit, and the third amplifying unit, the negative pressure control unit includes: a voltage stabilizing circuit and a plurality of ground capacitors. The plurality of ground capacitors are respectively arranged at the input and output ends of the voltage stabilizing circuit, and the capacitance values ​​of the plurality of ground capacitors are different to meet the power supply requirements of different amplifying units. One end of the voltage stabilizing circuit is electrically connected to the power supply module and the negative pressure control unit through a plurality of ground capacitors, and the other end of the voltage stabilizing circuit is electrically connected to the first amplifying unit, the second amplifying unit, and the third amplifying unit through a plurality of ground capacitors to supply power to the first amplifying unit, the second amplifying unit, and the third amplifying unit according to different power supply requirements. Preferably, the voltage stabilizing circuit can be set as: a voltage regulator tube.

[0041] In one feasible embodiment, the temperature compensation unit may be provided with a temperature compensation attenuator to achieve temperature compensation for the multi-stage power amplifier of the input RF signal. Furthermore, to ensure gain effects at different frequency points within the bandwidth of the input RF signal processed by the first amplification unit, the equalization unit may be provided with an equalizer.

[0042] In some embodiments, the present invention further provides a high-isolation power amplifier device resistant to power supply interference. The power amplifier device utilizes the power amplifier circuit described above. The power amplifier device sequentially includes a temperature compensation unit, a first amplification unit, an equalization unit, a second amplification unit, and a third amplification unit. The input RF signal transmitted through the input end of the power amplifier circuit is first subjected to temperature compensation, split power amplifier isolation synthesis, gain equalization, and amplification isolation operations. Simultaneously, a negative voltage control unit is used to control the power supply end of the power amplifier circuit to ensure stable power supply to each level of the power amplifier unit in the power amplifier circuit. This overcomes the drawback of the prior art that the power amplifier circuit is susceptible to interference from the power supply or other signals.

[0043] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-isolation power amplifier circuit that is resistant to power supply interference, characterized in that: include: a temperature compensation unit, the temperature compensation unit being electrically connected to the input end of the power amplifier circuit, and the temperature compensation unit being used to perform temperature compensation on an input radio frequency signal transmitted from the input end of the power amplifier circuit; a first amplifying unit, the first amplifying unit being connected to the temperature compensating unit, and dividing the input RF signal into equal parts, removing the DC signal, amplifying the signal, and then re-synthesizing the signal; an equalizing unit, the equalizing unit being electrically connected to the output end of the first amplifying unit, and configured to perform gain adjustment at different frequency points within a bandwidth on the input RF signal processed by the first amplifying unit; a second amplifying unit, the second amplifying unit being electrically connected to the equalizing unit, and configured to amplify the input RF signal after being amplified by the equalizing unit; a third amplifying unit, the third amplifying unit being electrically connected to the second amplifying unit, and configured to amplify the input RF signal processed by the second amplifying unit, thereby improving the isolation between the amplifying units at each stage, and also improving the anti-total reflection capability of the front-stage power amplifier module; A negative voltage control unit, one end of the negative voltage control unit is electrically connected to the power supply end of the power amplifier circuit, and the other end of the negative voltage control unit is electrically connected to the first amplifying unit, the second amplifying unit, and the third amplifying unit respectively. The negative voltage control unit is used to stabilize the current at the power supply end and stabilize the power supply to the first amplifying unit, the second amplifying unit, and the third amplifying unit according to the set power supply timing.

2. The high-isolation power amplifier circuit resistant to power supply interference according to claim 1, characterized in that: The first amplification unit includes: a first bridge connected to the temperature compensation unit via a DC blocking capacitor, and configured to divide the input RF signal processed by the temperature compensation unit into two equal parts; Two power amplifier tubes, the input ends of the two power amplifier tubes being electrically connected to the first bridge respectively, so as to enable the two power amplifier tubes to amplify the input radio frequency signal split into two parts; The second bridge is electrically connected to the other ends of the two power amplifier tubes through two DC blocking capacitors, and the second bridge is used to synthesize the two input RF signals that have been amplified by the two power amplifier tubes.

3. The high-isolation power amplifier circuit resistant to power supply interference according to claim 2, characterized in that: The third amplifying unit includes: a circulator, the circulator having three pins, one pin of the circulator being electrically connected to the second amplifying unit via a DC blocking capacitor; A power amplifier tube, the power amplifier tube being electrically connected to the second pin of the circulator; A ceramic load is electrically connected to the three pins of the circulator.

4. The high-isolation power amplifier circuit resistant to power supply interference according to claim 3, characterized in that: The negative pressure control unit comprises: A plurality of ground capacitors, wherein the plurality of ground capacitors are respectively arranged at the input and output ends of the voltage stabilizing circuit; wherein the capacitance values ​​of the plurality of ground capacitors are different; A voltage stabilizing circuit, one end of which is electrically connected to the power supply module and the negative pressure control unit through multiple capacitors to ground, and the other end of which is electrically connected to the first amplifying unit, the second amplifying unit, and the third amplifying unit through multiple capacitors to ground.

5. The high-isolation power amplifier circuit resistant to power supply interference according to claim 4, characterized in that: The voltage stabilizing circuit includes: a voltage stabilizing tube.

6. The high-isolation power amplifier circuit resistant to power supply interference according to claim 1, characterized in that: The temperature compensation unit includes a temperature compensation attenuator.

7. The high-isolation power amplifier circuit resistant to power supply interference according to claim 1, characterized in that: The balancing unit includes: an equalizer.

8. A high-isolation power amplifier device resistant to power supply interference, characterized in that: A high-isolation power amplifier circuit resistant to power supply interference according to any one of claims 1 to 7 is adopted.

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