Power control circuit and radio frequency signal transmission device

Abstract

This application provides a power control circuit and an radio frequency (RF) signal transmission device, relating to the field of power control technology. In this power control circuit, the input terminal of a signal conversion circuit and the detection terminal of a detection circuit receive RF signals; the output terminal of the signal conversion circuit is connected to the input terminal of a gain circuit; the output terminals of the gain circuit and the detection circuit are connected to a control circuit, and the control terminal of the gain circuit is also connected to the control circuit; the detection circuit outputs a response signal corresponding to the RF signal; the signal conversion circuit converts the RF signal into a differential signal; and the control circuit, upon receiving the output signal and response signal from the gain circuit, outputs a corresponding gain adjustment signal to the control terminal of the gain circuit. The embodiments of this application can achieve dynamic gain control, reduce the occurrence of RF front-end saturation, thereby effectively meeting the requirements of high dynamic input and expanding the application range of the RF front-end.

Description

Technical Field

[0001] This application relates to the field of power control technology, and more specifically, to a power control circuit and a radio frequency signal transmission device. Background Technology

[0002] As is well known, different communication systems use different signal bands. However, the RF gain amplifiers in the RF front-end of existing traditional receiver systems are generally narrowband receivers, only capable of receiving signals from one specific signal band. Furthermore, most modern communication systems use single-ended RF inputs, while chips require differential signals to suppress common-mode signals. Therefore, an external signal conversion circuit is typically added to output the differential signal, which is then amplified by the gain circuit. However, existing gain circuits generally operate with a fixed gain, which can easily saturate the RF front-end under conditions of high interference, making them unsuitable for applications with strong interference or weak signals requiring high dynamic range, thus limiting the application scope of the RF front-end. Utility Model Content

[0003] This application provides a power control circuit and an RF signal transmission device, which can solve the problem that the existing RF front-end has a fixed gain, is prone to saturation when there is large interference input, cannot meet the high dynamic input requirements, and limits the application range.

[0004] To achieve this objective, the embodiments of this application provide the following solutions.

[0005] According to one aspect of the embodiments of this application, a power control circuit is provided, including a detection circuit, a control circuit, a signal conversion circuit, and a gain circuit. The input terminal of the signal conversion circuit and the detection terminal of the detection circuit receive radio frequency signals, and the output terminal of the signal conversion circuit is connected to the input terminal of the gain circuit.

[0006] The output terminals of the gain circuit and the detector circuit are connected to the control circuit, and the control terminal of the gain circuit is connected to the control circuit.

[0007] The detector circuit is used to output a response signal corresponding to the radio frequency signal;

[0008] The signal conversion circuit is used to convert the radio frequency signal into a differential signal;

[0009] The control circuit is used to output a corresponding gain adjustment signal to the control terminal of the gain circuit after receiving the output signal and the response signal of the gain circuit.

[0010] In one possible implementation, the detection circuit includes a detector, a third capacitor, a fourth resistor, and a fourth capacitor. The detection terminal of the detector is connected to the input terminal of the signal conversion circuit and the first terminal of the third capacitor. The first terminal of the fourth resistor is connected to the second terminal of the third capacitor. The second terminal of the fourth resistor is grounded and connected to the first terminal of the fourth capacitor. The second terminal of the fourth capacitor is connected to the common-mode voltage adjustment terminal of the detector. The signal output terminal of the detector is connected to the control circuit.

[0011] In one possible implementation, the detection circuit further includes a third resistor, a seventh resistor, and an eighth resistor. One end of the third resistor is grounded, and the other end is connected to the temperature compensation terminal of the detector. The first end of the eighth resistor is grounded, and the second end is connected to the control circuit and the second end of the seventh resistor. The first end of the seventh resistor is connected to the signal output terminal of the detector.

[0012] In one possible implementation, the detection circuit further includes a sixth resistor, a fifth capacitor, and a ninth resistor. The first end of the ninth resistor is connected to the first end of the seventh resistor, the second end of the ninth resistor is connected to the second end of the sixth resistor and the voltage detection terminal of the detector, the first end of the sixth resistor is connected to the first end of the fifth capacitor and the low-impedance connection terminal of the detector, and the second end of the fifth capacitor is connected to the capacitor connection terminal of the detector.

[0013] In one possible implementation, the signal conversion circuit includes a balun, a 26th capacitor, an 18th capacitor, and a 19th capacitor. The first terminal of the 26th capacitor receives the radio frequency signal, and the second terminal is connected to the signal input terminal of the balun. The first terminal of the 18th capacitor is connected to the signal output terminal of the balun, and the second terminal of the 18th capacitor is connected to the gain circuit. The first terminal of the 19th capacitor is connected to the second signal output terminal of the balun, and the second terminal of the 19th capacitor is connected to the gain circuit.

[0014] In one possible implementation, the gain circuit includes a gain amplifier, a tenth resistor, and a twenty-fifth capacitor. The signal input terminal of the gain amplifier is connected to the signal conversion circuit. The second terminal of the tenth resistor is connected to the control circuit. The first terminal of the tenth resistor is connected to the first terminal of the twenty-fifth capacitor and the gain amplification control pin of the gain amplifier. The second terminal of the twenty-fifth capacitor is grounded.

[0015] In one possible implementation, the control circuit includes a control chip, the signal input terminal of which is connected to the output terminal of the detection circuit, and the signal control terminal of which is connected to the gain amplification control pin of the gain amplifier.

[0016] In one possible implementation, the power control circuit further includes a power supply filter circuit and a power supply, the power supply being connected to the detector circuit, the control circuit, the signal conversion circuit, and the gain circuit to provide power.

[0017] One end of the power filter circuit is connected to the power supply terminal of the power supply, and the other end is grounded.

[0018] In one possible implementation, the detector circuit and the gain circuit operate at the same voltage, and the power supply filter circuits connected to the detector circuit and the gain circuit are different.

[0019] According to one aspect of the present application, a radio frequency signal transmission device is provided, the radio frequency signal transmission device including the power control circuit as described above.

[0020] The beneficial effects of the technical solutions provided in this application are:

[0021] The power control circuit provided in this application includes a detector circuit, a control circuit, a signal conversion circuit, and a gain circuit. The input terminal of the signal conversion circuit and the detection terminal of the detector circuit receive radio frequency (RF) signals, and the output terminal of the signal conversion circuit is connected to the input terminal of the gain circuit. The output terminals of the gain circuit and the detector circuit are connected to the control circuit, and the control terminal of the gain circuit is also connected to the control circuit. The detector circuit outputs a response signal corresponding to the RF signal. The signal conversion circuit converts the RF signal into a differential signal. The control circuit, after receiving the output signal and response signal from the gain circuit, outputs a corresponding gain adjustment signal to the control terminal of the gain circuit. This embodiment of the application enables dynamic gain control, reduces RF front-end saturation, effectively meets the requirements of high dynamic input, and expands the application range of the RF front-end. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below.

[0023] Figure 1 A connection diagram of the power control circuit provided in the embodiments of this application;

[0024] Figure 2 A circuit diagram of the detection circuit provided in the embodiments of this application;

[0025] Figure 3 A circuit diagram of the control circuit provided in the embodiments of this application;

[0026] Figure 4 A circuit diagram of the signal conversion circuit provided in the embodiments of this application;

[0027] Figure 5 A circuit diagram of the gain circuit provided in the embodiments of this application;

[0028] Figure 6 A circuit diagram of a power filtering circuit provided in an embodiment of this application;

[0029] Figure 7 This is a structural diagram of the radio frequency signal transmission device provided in the embodiments of this application.

[0030] Label Explanation:

[0031] C1, First capacitor; C2, Second capacitor; C24, Twenty-fourth capacitor; C6, Sixth capacitor; C20, Twentieth capacitor; C7, Seventh capacitor; C21, Twenty-first capacitor; C23, Twenty-third capacitor; C9, Ninth capacitor; U4, Control chip; U3, Gain amplifier; R10, Tenth resistor; C25, Twenty-fifth capacitor; T1, Balun; C26, Twenty-sixth capacitor; C18, Eighteenth capacitor; C19, Nineteenth capacitor; R6, Sixth resistor; C5, Fifth capacitor; R9, Ninth resistor; R3, Third resistor; R7, Seventh resistor; R8, Eighth resistor; U2, Detector; C3, Third capacitor; R4, Fourth resistor; C4, Fourth capacitor. Detailed Implementation

[0032] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0033] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the terms “comprising” and “including” as used in embodiments of this application mean that the corresponding feature can be implemented as the presented feature, information, data, step, operation, element, and / or component, but do not exclude implementation as other features, information, data, step, operation, element, component, and / or combinations thereof supported by the art. It should be understood that when we say that an element is “connected” or “coupled” to another element, the one element can be directly connected or coupled to the other element, or it can mean that the one element and the other element establish a connection relationship through an intermediate element. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein indicates at least one of the items defined by the term; for example, “A and / or B” indicates implementation as “A,” or implementation as “A,” or implementation as “A and B.”

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0035] The technical solutions of this utility model and their effects are described below through several exemplary embodiments. It should be noted that the following embodiments can be referenced, borrowed from, or combined with each other. Identical terms, similar features, and similar implementation steps in different embodiments will not be repeated.

[0036] The power control circuit and radio frequency signal transmission device provided in this application are intended to solve at least one technical problem existing in the prior art.

[0037] This application provides a power control circuit that can be used in the radio frequency front end of a receiver or in other radio frequency signal transmission devices capable of transmitting radio frequency signals.

[0038] Optionally, the power control circuit of this application is as follows: Figures 1-6 As shown, it includes a detector circuit, a control circuit, a signal conversion circuit, and a gain circuit. The input terminal of the signal conversion circuit and the detection terminal of the detector circuit receive radio frequency (RF) signals, and the output terminal of the signal conversion circuit is connected to the input terminal of the gain circuit. The output terminals of the gain circuit and the detector circuit are connected to the control circuit, and the control terminal of the gain circuit is also connected to the control circuit. The detector circuit outputs a response signal corresponding to the RF signal. The signal conversion circuit converts the RF signal into a differential signal. The control circuit, after receiving the output signal and response signal from the gain circuit, outputs a corresponding gain adjustment signal to the control terminal of the gain circuit. The gain circuit adjusts the gain according to the received gain adjustment signal to increase or decrease the signal amplification factor.

[0039] Optionally, the detection circuit includes a detector U2, a third capacitor C3, a fourth resistor R4, and a fourth capacitor C4. The detection terminal of the detector U2 is connected to the input terminal of the signal conversion circuit and the first terminal of the third capacitor C3. The first terminal of the fourth resistor R4 is connected to the second terminal of the third capacitor C3. The second terminal of the fourth resistor R4 is grounded and connected to the first terminal of the fourth capacitor C4. The second terminal of the fourth capacitor C4 is connected to the common-mode voltage adjustment terminal of the detector U2. The signal output terminal of the detector U2 is connected to the control circuit.

[0040] Optionally, to meet the requirements of constant output and adapt to high temperature difference environments, the detector U2 can be model AD8317. This detector U2 has high-precision linear consistency error, which can maintain an error of ±0.5dB over the entire operating temperature range, thereby ensuring that the control circuit can receive a signal that accurately reflects the current RF signal magnitude and improve the gain adjustment effect.

[0041] Alternatively, the detector U2 can also be an AD8302, AD8318, ADL5385, or other devices capable of detecting the magnitude of a radio frequency signal and outputting a corresponding response signal indicating that magnitude.

[0042] Optionally, the third capacitor C3, the fourth resistor R4, and the fourth capacitor C4 are combined with the input impedance inside the detector U2 to form a wide input impedance with a specific resistance value (e.g., 50 ohms). Furthermore, the third capacitor C3 and the fourth capacitor C4 have a DC blocking function to prevent DC signal input and damage to the device.

[0043] Optionally, the detection circuit also includes a third resistor R3, a seventh resistor R7, and an eighth resistor R8. One end of the third resistor R3 is grounded, and the other end is connected to the temperature compensation terminal of the detector U2. The first end of the eighth resistor R8 is grounded, and the second end is connected to the control circuit and the second end of the seventh resistor R7. The first end of the seventh resistor R7 is connected to the signal output terminal of the detector U2. The performance of the detector U2's input frequency is optimized by adjusting the resistance value of the third resistor R3. The seventh resistor R7 and the eighth resistor R8 form a voltage divider circuit, and the control circuit performs gain control based on the voltage value at the second end of the eighth resistor R8.

[0044] Optionally, the detection circuit also includes a sixth resistor R6, a fifth capacitor C5, and a ninth resistor R9. The first terminal of the ninth resistor R9 is connected to the first terminal of the seventh resistor R7, and the second terminal of the ninth resistor R9 is connected to the second terminal of the sixth resistor R6 and the voltage detection terminal of the detector U2. The first terminal of the sixth resistor R6 is connected to the first terminal of the fifth capacitor C5 and the low-impedance connection terminal of the detector U2, and the second terminal of the fifth capacitor C5 is connected to the capacitor connection terminal of the detector U2. The ninth resistor R9 and the sixth resistor R6 form a voltage divider circuit to attenuate the voltage input to the voltage detection terminal of the detector U2, and the fifth capacitor C5 is a filter capacitor, achieving DC signal filtering.

[0045] Optionally, the signal conversion circuit includes a balun T1, a 26th capacitor C26, an 18th capacitor C18, and a 19th capacitor C19. The first terminal of the 26th capacitor C26 receives the radio frequency signal, and the second terminal is connected to the signal input terminal of the balun T1. The first terminal of the 18th capacitor C18 is connected to the signal output terminal of the balun T1, and the second terminal of the 18th capacitor C18 is connected to the gain circuit. The first terminal of the 19th capacitor C19 is connected to the second signal output terminal of the balun T1, and the second terminal of the 19th capacitor C19 is connected to the gain circuit. The balun T1 converts the input radio frequency signal into a differential signal.

[0046] In one embodiment, the model of the balun T1 can be MG-TC1-1-13M, or it can be BAL-0010, MABA-011082, HL9405, or other models capable of converting radio frequency signals into differential signals.

[0047] Optionally, the gain circuit includes a gain amplifier U3, a tenth resistor R10, and a twenty-fifth capacitor C25. The signal input terminal of the gain amplifier U3 is connected to the signal conversion circuit. The second terminal of the tenth resistor R10 is connected to the control circuit. The first terminal of the tenth resistor R10 is connected to the first terminal of the twenty-fifth capacitor C25 and the gain amplification control pin of the gain amplifier U3. The second terminal of the twenty-fifth capacitor C25 is grounded. The signal output terminal of the gain amplifier U3 can be connected to an RF chip for signal processing, outputting an amplified signal that meets the processing requirements of the RF chip. The tenth resistor R10 and the twenty-fifth capacitor C25 form an RC network, which eliminates high-frequency signals and ensures circuit stability.

[0048] In one embodiment, the gain amplifier U3 can be an ADL6317, which provides precise gain control. Upon receiving a gain control signal from the control circuit, the gain amplifier U3 adjusts its gain according to the signal. Alternatively, the gain amplifier U3 can be an ADL5202ACPZ-R7, HMC960LP4E, AD628ARZ-R7, or other devices capable of providing precise gain control.

[0049] Optionally, the control circuit includes a control chip U4, the signal input terminal of the control chip U4 is connected to the output terminal of the detection circuit, and the signal control terminal of the control chip U4 is connected to the gain amplification control pin of the gain amplifier U3.

[0050] In one embodiment, the control chip U4 can be an FPGA chip, which modulates and adjusts the signal transmitted by the detector U2. The TXEN, CS, SDI, SCLK, and SDO pins of this chip can be connected to the gain amplifier U3, controlling the gain of the gain amplifier U3 through these pins. Alternatively, the control chip U4 can be a ZYNQ type chip (such as Zynq-7000 or Zynq RFSoC).

[0051] Optionally, the power control circuit also includes a power supply filter circuit and a power supply. The power supply is connected to the detection circuit, control circuit, signal conversion circuit, and gain circuit to provide power. One end of the power supply filter circuit is connected to the power supply terminal of the power supply, and the other end is grounded. The power supply filter circuit may include a capacitor to perform the power filtering function.

[0052] Optionally, the detection circuit and the gain circuit operate at the same voltage, but the power supply filter circuits connected to the detection circuit and the gain circuit are different.

[0053] In one embodiment, the gain amplifier U3 of the gain circuit is connected to multiple power supply filter circuits. Specifically, pins 13, 17, and 15 of the gain amplifier U3 are each connected to a power supply filter circuit. Each power supply filter circuit has two capacitors connected in parallel. These capacitors include the sixth capacitor C6, the twentieth capacitor C20, the seventh capacitor C7, the twenty-first capacitor C21, the twenty-third capacitor C23, and the ninth capacitor C9.

[0054] In one embodiment, the detector U2 in the detection circuit is connected to two power filter circuits, each of which has a capacitor (i.e., a first capacitor C1 and a second capacitor C2). The control chip U4 of the control circuit can also be connected to a power filter circuit. Specifically, the operating voltage of the control chip U4 can be 3.3V. The first terminal of the twenty-fourth capacitor C24 is grounded, and the second terminal is connected to the voltage input terminal of the control chip U4.

[0055] The power control circuit provided in this application includes a detector circuit, a control circuit, a signal conversion circuit, and a gain circuit. The input terminal of the signal conversion circuit and the detection terminal of the detector circuit receive radio frequency (RF) signals, and the output terminal of the signal conversion circuit is connected to the input terminal of the gain circuit. The output terminals of the gain circuit and the detector circuit are connected to the control circuit, and the control terminal of the gain circuit is also connected to the control circuit. The detector circuit outputs a response signal corresponding to the RF signal. The signal conversion circuit converts the RF signal into a differential signal. The control circuit, after receiving the output signal and response signal from the gain circuit, outputs a corresponding gain adjustment signal to the control terminal of the gain circuit. This embodiment of the application enables dynamic gain control, reduces RF front-end saturation, effectively meets the requirements of high dynamic input, and expands the application range of the RF front-end.

[0056] Based on the same inventive concept, embodiments of this application also propose a radio frequency signal transmission device, such as... Figure 7 As shown, the radio frequency signal transmission device includes a power control circuit as described in the above embodiment. The power control circuit receives a radio frequency signal, converts it into a differential signal, amplifies the differential signal, and outputs it. In the process of processing the radio frequency signal, the control circuit controls the gain of the differential signal amplification process according to the response signal transmitted by the detector circuit to achieve dynamic gain adjustment.

[0057] The terms "first," "second," "third," "fourth," "1," "2," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than that shown in the illustrations or text descriptions.

[0058] It should be understood that although arrows indicate various operation steps in the flowcharts of this application's embodiments, the order in which these steps are implemented is not limited to the order indicated by the arrows. Unless explicitly stated herein, in some implementation scenarios of this application's embodiments, the implementation steps in each flowchart can be executed in other orders as required. Furthermore, some or all steps in each flowchart, based on the actual implementation scenario, may include multiple sub-steps or multiple stages. Some or all of these sub-steps or stages can be executed at the same time, and each sub-step or stage can also be executed at different times. In scenarios where execution times differ, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and this application's embodiments do not limit this.

[0059] The above description is only an optional implementation method for some implementation scenarios of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application without departing from the technical concept of this application also fall within the protection scope of the embodiments of this application.

Claims

1. A power control circuit, characterized by, It includes a detector circuit, a control circuit, a signal conversion circuit, and a gain circuit. The input terminal of the signal conversion circuit and the detector terminal of the detector circuit receive radio frequency signals, and the output terminal of the signal conversion circuit is connected to the input terminal of the gain circuit. The output terminals of the gain circuit and the detector circuit are connected to the control circuit, and the control terminal of the gain circuit is connected to the control circuit. The detector circuit is used to output a response signal corresponding to the radio frequency signal; The signal conversion circuit is used to convert the radio frequency signal into a differential signal; The control circuit is used to output a corresponding gain adjustment signal to the control terminal of the gain circuit after receiving the output signal and the response signal of the gain circuit.

2. The power control circuit of claim 1, wherein, The detection circuit includes a detector, a third capacitor, a fourth resistor, and a fourth capacitor. The detection terminal of the detector is connected to the input terminal of the signal conversion circuit and the first terminal of the third capacitor. The first terminal of the fourth resistor is connected to the second terminal of the third capacitor. The second terminal of the fourth resistor is grounded and connected to the first terminal of the fourth capacitor. The second terminal of the fourth capacitor is connected to the common-mode voltage adjustment terminal of the detector. The signal output terminal of the detector is connected to the control circuit.

3. The power control circuit of claim 2, wherein, The detection circuit also includes a third resistor, a seventh resistor, and an eighth resistor. One end of the third resistor is grounded, and the other end is connected to the temperature compensation terminal of the detector. The first end of the eighth resistor is grounded, and the second end is connected to the control circuit and the second end of the seventh resistor. The first end of the seventh resistor is connected to the signal output terminal of the detector.

4. The power control circuit of claim 3, wherein, The detection circuit further includes a sixth resistor, a fifth capacitor, and a ninth resistor. The first end of the ninth resistor is connected to the first end of the seventh resistor, the second end of the ninth resistor is connected to the second end of the sixth resistor and the voltage detection terminal of the detector, the first end of the sixth resistor is connected to the first end of the fifth capacitor and the low impedance connection terminal of the detector, and the second end of the fifth capacitor is connected to the capacitor connection terminal of the detector.

5. The power control circuit of claim 1, wherein, The signal conversion circuit includes a balun, a 26th capacitor, an 18th capacitor, and a 19th capacitor. The first terminal of the 26th capacitor receives the radio frequency signal, and the second terminal is connected to the signal input terminal of the balun. The first terminal of the 18th capacitor is connected to the signal output terminal of the balun, and the second terminal of the 18th capacitor is connected to the gain circuit. The first terminal of the 19th capacitor is connected to the second signal output terminal of the balun, and the second terminal of the 19th capacitor is connected to the gain circuit.

6. The power control circuit of claim 1, wherein, The gain circuit includes a gain amplifier, a tenth resistor, and a twenty-fifth capacitor. The signal input terminal of the gain amplifier is connected to the signal conversion circuit. The second terminal of the tenth resistor is connected to the control circuit. The first terminal of the tenth resistor is connected to the first terminal of the twenty-fifth capacitor and the gain amplification control pin of the gain amplifier. The second terminal of the twenty-fifth capacitor is grounded.

7. The power control circuit of claim 6, wherein, The control circuit includes a control chip, the signal input terminal of which is connected to the output terminal of the detector circuit, and the signal control terminal of which is connected to the gain amplification control pin of the gain amplifier.

8. The power control circuit of claim 1, wherein, The power control circuit further includes a power filter circuit and a power supply, the power supply being connected to the detector circuit, the control circuit, the signal conversion circuit and the gain circuit to provide power; One end of the power filter circuit is connected to the power supply terminal of the power supply, and the other end is grounded.

9. The power control circuit of claim 8, wherein, The detection circuit and the gain circuit operate at the same voltage, but the power supply filter circuits connected to the detection circuit and the gain circuit are different.

10. A radio frequency signal transmission device, characterized by, The radio frequency signal transmission device includes the power control circuit as described in any one of claims 1-9.

Images