Dual-frequency amplifier circuit

Abstract

The utility model discloses a dual-frequency amplifier circuit, comprising a first input port used for receiving a first input signal; the first circuit is electrically connected with the first input port and used for processing the first input signal, generating a first signal and transmitting the first signal to the output port; the second input port is used for receiving a second input signal; the second circuit is electrically connected with the second input port and used for processing the second input signal, generating a second signal and transmitting the second signal to the output port; the duplexer is electrically connected with the output ends of the first circuit and the second circuit, and is used for combining and amplifying the first signal and the second signal to generate an amplified signal to be transmitted to the output port; and the output port is electrically connected with the output end of the duplexer and is used for outputting the amplified signal. Through the above design, a traditional method that an external filter and a combiner are needed to carry out signal combination of two channels can be avoided, and signal reception of the unmanned aerial vehicle caused by external interference signals can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of amplifiers, in particular to a dual-frequency amplifier circuit. Background Art

[0002] In the field of drones, there is usually a remote control to control the flight of a drone. The remote control has an amplifier to receive signals from the drone, so that the flight status of the drone can be monitored in real time.

[0003] The amplifiers currently on the market are either broadband amplification, or narrowband amplification for a single frequency band, or amplification of different frequency signals by switching. External filters and combiners are required to achieve the two-input and one-output amplification effect. Because it is outdoors, there will inevitably be out-of-band signal interference, which will generate some interference signals, thus affecting the signal reception of the drone.

[0004] Therefore, the above problems need to be solved urgently by those skilled in the art. Utility Model Content

[0005] In order to solve the technical defects raised in the above-mentioned background technology, the purpose of the utility model is to provide a dual-frequency amplifier, which can avoid the traditional need for external filters and combiners to merge the signals of the two channels, and can avoid the signal reception of the drone due to external interference signals.

[0006] The utility model adopts the following technical solutions:

[0007] A dual-frequency amplifier circuit, comprising:

[0008] A first input port, used to receive a first input signal;

[0009] A first circuit, electrically connected to the first input port, for processing the first input signal and generating a first signal to transmit to an output port;

[0010] A second input port, used to receive a second input signal;

[0011] a second circuit, electrically connected to the second input port, for processing the second input signal and generating a second signal to transmit to the output port;

[0012] a duplexer, electrically connected to the output ends of the first circuit and the second circuit, for combining and amplifying the first signal and the second signal to generate an amplified signal for transmission to an output port;

[0013] The output port is electrically connected to the output end of the duplexer and is used to output the amplified signal.

[0014] Optionally, the first circuit includes:

[0015] A first input limiting unit, electrically connected to the first input port, and configured to limit the first input signal;

[0016] A first low-noise amplifying unit, electrically connected to an output end of the first input limiting unit, and configured to filter and amplify the first input signal;

[0017] A first attenuation unit, electrically connected to the output end of the first low-noise amplification unit, and used for processing the port standing wave ratio of the first input signal to reduce signal reflection;

[0018] The first bandpass filter is electrically connected to the output end of the first attenuation unit and is used for filtering the first input signal output by the first attenuation unit.

[0019] Optionally, the first circuit further includes:

[0020] a second low-noise amplifying unit, electrically connected to the output end of the first band-pass filter, and configured to filter and amplify the first input signal;

[0021] The second attenuation unit is electrically connected to the second low-noise amplifying unit and is used to process the port standing wave ratio of the first input signal output by the second low-noise amplifying unit to reduce signal reflection.

[0022] Optionally, the second circuit includes:

[0023] A second input limiting unit, electrically connected to the second input port, and configured to limit the second input signal;

[0024] A third low-noise amplifying unit, electrically connected to the output end of the second input limiting unit, and configured to filter and amplify the second input signal;

[0025] a third attenuation unit, electrically connected to the output end of the third low-noise amplification unit, and configured to process the port standing wave ratio of the second input signal to reduce signal reflection;

[0026] The second bandpass filter is electrically connected to the output end of the third attenuation unit and is used for filtering the second input signal output by the third attenuation unit.

[0027] Optionally, the second circuit further includes:

[0028] a fourth low-noise amplifying unit, electrically connected to the output end of the second band-pass filter, and configured to filter and amplify the second input signal;

[0029] The fourth attenuation unit is electrically connected to the third low-noise amplifying unit and is used to process the port standing wave ratio of the second input signal output by the third low-noise amplifying unit to reduce signal reflection.

[0030] Optionally, the duplexer is a 2.4G / 5.8G dual-in-one bandpass filter.

[0031] In summary, the beneficial effects of the utility model are:

[0032] By setting the first circuit, the first input signal received by the first input port can be filtered and amplified, so that the interference signal can be filtered, and the first input signal of the 5.8G frequency band can be amplified, so that the first input signal can be smoother, thereby avoiding the influence of the interference signal, and the second input signal input by the second input port is filtered and amplified by the second circuit, and then the second input signal of the 2.4G frequency band can be processed and filtered, and then the first input signal and the second input signal of the first circuit and the second circuit are merged by the duplexer, so as to avoid the traditional way of merging the signals of the two channels through external filters and combiners, and at the same time, the interference signal generated by the outside world can be filtered through the above scheme, thereby improving the signal reception effect.

[0033] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the circuit structure of an embodiment of the utility model.

[0035] Description of reference numerals in the figures:

[0036] 1. First input port; 2. First circuit; 21. First input limiting unit; 22. First low-noise amplifying unit; 23. First attenuation unit; 24. First band-pass filter; 25. Second low-noise amplifying unit; 26. Second attenuation unit; 3. Second input port; 4. Second circuit; 41. Second input limiting unit; 42. Third low-noise amplifying unit; 43. Third attenuation unit; 44. Second band-pass filter; 45. Fourth low-noise amplifying unit; 46. Fourth attenuation unit; 5. Duplexer; 6. Output port. DETAILED DESCRIPTION

[0037] In order to make the content of the utility model more clearly understood, the utility model is further described below based on specific embodiments in combination with the accompanying drawings.

[0038] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like used herein to indicate directions or positional relationships are based on directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Unless otherwise specified, "plurality" means two or more.

[0039] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood by specific circumstances.

[0040] like Figure 1 As shown, the embodiment of the present application provides a dual-frequency amplifier circuit, including a first input port 1, for receiving a first input signal; a first circuit 2, electrically connected to the first input port 1, for processing the first input signal and generating a first signal to be transmitted to an output port 6; a second input port 3, for receiving a second input signal; a second circuit 4, electrically connected to the second input port 3, for processing the second input signal and generating a second signal to be transmitted to the output port 6; a duplexer 5, electrically connected to the output ends of the first circuit 2 and the second circuit 4, for combining the first signal and the second signal and amplifying them to generate an amplified signal to be transmitted to the output port 6;

[0041] The output port 6 is electrically connected to the output end of the duplexer 5 and is used to output the amplified signal.

[0042] In the embodiment of the present application, the above-mentioned first input port 1 is used to receive a signal in the 5.8G frequency band and input it into the first circuit 2. The above-mentioned first circuit 2 is electrically connected to the first input port 1. By setting the first circuit 2, the first input signal can be filtered, so as to improve its anti-interference ability; at the same time, the first input signal is processed and then transmitted to the duplexer 5, so that it can be merged with the second input signal and amplified; the above-mentioned first input port 1 is used to receive a signal in the 2.4G frequency band and input it into the second circuit 4. The second input signal is processed by the second circuit 4 and output to the duplexer 5, so that it can be merged with the 5.8G signal and filtered and amplified, so that the interference signals in the first input signal and the second input signal can be filtered, so as to generate an amplified signal, thereby avoiding the reception of the drone signal due to out-of-band interference signals.

[0043] Optional, such as Figure 1 As shown, the first circuit 2 includes a first input limiting unit 21, which is electrically connected to the first input port 1 and is used to limit the first input signal; a first low-noise amplifying unit 22, which is electrically connected to the output end of the first input limiting unit 21 and is used to filter and amplify the first input signal; a first attenuation unit 23, which is electrically connected to the output end of the first low-noise amplifying unit 22 and is used to process the port standing wave ratio of the first input signal to reduce signal reflection; and a first bandpass filter 24, which is electrically connected to the output end of the first attenuation unit 23 and is used to filter the first input signal output by the first attenuation unit 23.

[0044] In an embodiment of the present application, the first input limiting unit 21 is electrically connected to the first input port 1. By setting the first limiting unit, an input protection function can be achieved. The first limiting unit includes a PIN diode and a resistor. One end of the resistor is grounded and the other end is electrically connected to the first input port 1. The cathode of the PIN diode is grounded and the other end is electrically connected to the first input port 1, thereby forming a first limiting unit. The limiting threshold is 10dBm. When the input signal exceeds 10dBm, the limiter starts to limit the amplitude, thereby protecting the entire circuit. The first low-noise amplifying unit 22 is electrically connected to the output end of the first input limiting unit 21, and is used to filter and amplify the first input signal. By setting the first low-noise amplifying unit 22, the gain of the overall circuit can be adjusted. On the other hand, the port standing wave ratio between circuits can be improved, signal reflection can be reduced, and the anti-interference ability of the first circuit 2 is improved.

[0045] The above-mentioned first attenuation unit 23 is electrically connected to the output end of the first low-noise amplification unit 22. The above-mentioned first attenuation unit 23 may include a resistor and two other resistors (the other end of which is grounded) of which one end is electrically connected to the resistor. By setting the above-mentioned three resistors, the first attenuation unit 23 can be formed. By setting the first attenuation unit 23, the overall gain of the circuit can be adjusted. On the other hand, the port standing wave ratio between circuits can also be improved to reduce signal reflection; the input end of the above-mentioned first bandpass filter 24 is electrically connected to the output end of the first attenuation unit 23, and the other end is electrically connected to the output port 6. By setting the first bandpass filter 24, out-of-band interference signals can be filtered out, thereby further filtering out interference signals, improving the anti-interference ability of the first circuit 2, and avoiding affecting the signal reception of the drone.

[0046] Optional, such as Figure 1 As shown, the first circuit 2 also includes a second low-noise amplifying unit 25, which is electrically connected to the output end of the first bandpass filter 24, and is used to filter and amplify the first input signal; a second attenuation unit 26, which is electrically connected to the second low-noise amplifying unit 25, and is used to process the port standing wave ratio of the first input signal output by the second low-noise amplifying unit 25 to reduce signal reflection.

[0047] In the embodiment of the present application, the above-mentioned second low-noise amplifying unit 25 is electrically connected to the output end of the first bandpass filter 24. By setting the first bandpass filter 24, the first input signal can be filtered and amplified. By setting the first low-noise amplifying unit 22 and the second low-noise amplifying unit 25 to attenuate the first input signal of the first circuit 2 in turn, the overall circuit can obtain a lower noise coefficient and a better port standing wave ratio, thereby further filtering the interference signal.

[0048] Optional, such as Figure 1 As shown, the second circuit 4 includes a second input limiting unit 41, which is electrically connected to the second input port 3 and is used to limit the second input signal; a third low-noise amplifying unit 42, which is electrically connected to the output end of the second input limiting unit 41 and is used to filter and amplify the second input signal; a third attenuation unit 43, which is electrically connected to the output end of the third low-noise amplifying unit 42 and is used to process the port standing wave ratio of the second input signal to reduce signal reflection; and a second bandpass filter 44, which is electrically connected to the output end of the third attenuation unit 43 and is used to filter the second input signal output by the third attenuation unit 43.

[0049] In the embodiment of the present application, the above-mentioned second input limiting unit 41 is electrically connected to the second input port 3, and is used to limit the second input signal; by setting the second input limiting unit 41, the second input signal can be limited, thereby protecting the second circuit 4; the above-mentioned third low-noise amplification unit 42 can also adjust the gain of the overall circuit by preliminarily filtering the second input signal and amplifying it, and on the other hand, it can also improve the port standing wave ratio between circuits and reduce signal reflection; the above-mentioned third attenuation unit 43 is electrically connected to the output end of the third low-noise amplification unit 42, and by setting the third attenuation unit 43 and the second bandpass filter 44, the above-mentioned second bandpass filter 44 is electrically connected to the output end of the third attenuation unit 43, and the second input signal can be denoised, thereby enhancing its anti-interference effect.

[0050] Optional, such as Figure 1 As shown, the second circuit 4 also includes a third low-noise amplifying unit 42, which is electrically connected to the output end of the second bandpass filter 44, and is used to filter and amplify the second input signal; a fourth attenuation unit 46, which is electrically connected to the fourth low-noise amplifying unit 45, and is used to process the port standing wave ratio of the second input signal output by the fourth low-noise amplifying unit 45 to reduce signal reflection.

[0051] In an embodiment of the present application, the input end of the third low-noise amplifying unit 42 is electrically connected to the output end of the second band-pass filter 44, so as to filter and amplify the second input signal output by the second band-pass filter 44, and electrically connect the fourth attenuation unit 46 to the fourth low-noise amplifying unit 45, wherein it should be noted that the fourth attenuation unit 46 and the fourth attenuation unit 46 can individually adjust the attenuation value of the attenuation circuit, and can flexibly change the gain of different channels.

[0052] Optional, such as Figure 1 As shown, the duplexer 5 is a 2.4G / 5.8G dual-in-one bandpass filter.

[0053] In the embodiment of the present application, the above-mentioned duplexer 5 is used to merge the first input signal and the second input signal in the first circuit 2 and the second circuit 4, and filter them again, so as to realize dual-frequency input, combine the two into one, and then output them through the output port 6, thereby avoiding the need for external filters and combiners to achieve the two-input and one-output amplification effect, thereby enriching its embodiments.

[0054] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dual-frequency amplifier circuit, characterized in that: include: A first input port (1), for receiving a first input signal; A first circuit (2), electrically connected to the first input port (1), for processing the first input signal and generating a first signal to transmit to an output port (6); A second input port (3), used for receiving a second input signal; a second circuit (4), electrically connected to the second input port (3), for processing the second input signal and generating a second signal for transmitting to an output port (6); A duplexer (5), electrically connected to the output ends of the first circuit (2) and the second circuit (4), and used for combining and amplifying the first signal and the second signal to generate an amplified signal for transmission to an output port (6); An output port (6) is electrically connected to the output end of the duplexer (5) and is used to output the amplified signal.

2. A dual-frequency amplifier circuit according to claim 1, characterized in that: The first circuit (2) comprises: A first input limiting unit (21), electrically connected to the first input port (1), and used for limiting the first input signal; A first low-noise amplifying unit (22), electrically connected to an output end of the first input limiting unit (21), and configured to filter and amplify the first input signal; A first attenuation unit (23), electrically connected to an output end of the first low-noise amplifying unit (22), and used for processing a port standing wave ratio of the first input signal to reduce signal reflection; The first bandpass filter (24) is electrically connected to the output end of the first attenuation unit (23) and is used to filter the first input signal output by the first attenuation unit (23).

3. A dual-frequency amplifier circuit according to claim 2, characterized in that: The first circuit (2) further comprises: A second low-noise amplifying unit (25), electrically connected to the output end of the first bandpass filter (24), and configured to filter and amplify the first input signal; The second attenuation unit (26) is electrically connected to the second low-noise amplifying unit (25) and is used to process the port standing wave ratio of the first input signal output by the second low-noise amplifying unit (25) to reduce signal reflection.

4. A dual-frequency amplifier circuit according to claim 1, characterized in that: The second circuit (4) comprises: A second input limiting unit (41), electrically connected to the second input port (3), and used for limiting the second input signal; A third low-noise amplifying unit (42), electrically connected to the output end of the second input limiting unit (41), and configured to filter and amplify the second input signal; A third attenuation unit (43), electrically connected to an output end of the third low-noise amplification unit (42), and used for processing a port standing wave ratio of the second input signal to reduce signal reflection; The second bandpass filter (44) is electrically connected to the output end of the third attenuation unit (43) and is used to filter the second input signal output by the third attenuation unit (43).

5. A dual-frequency amplifier circuit according to claim 4, characterized in that: The second circuit (4) further comprises: a fourth low-noise amplifying unit (45), electrically connected to the output end of the second band-pass filter (44), and configured to filter and amplify the second input signal; A fourth attenuation unit (46) is electrically connected to the fourth low-noise amplifying unit (45) and is used to process the port standing wave ratio of the second input signal output by the fourth low-noise amplifying unit (45) to reduce signal reflection.

6. A dual-frequency amplifier circuit according to claim 1, characterized in that: The duplexer (5) is a 2.4G / 5.8G dual-in-one bandpass filter.

Images