Linear frequency modulation transmit-receive assembly with silence function

Abstract

The utility model provides a linear frequency modulation transmit-receive assembly with a silence function, which relates to the technical field of signal processing, and comprises a transmitting link, a receiving link and an auxiliary signal processing module, a voltage-controlled oscillator circuit of the transmitting link generates a microwave signal, and finally an isolator circuit transmits the signal. Signal processing and controllable silence of a transmitting path are ensured; and the receiving link carries out front-end processing on the received signal and carries out frequency mixing on the received signal and the local oscillator signal distributed by the directional coupler circuit to generate a beat signal, and the beat signal is further amplified by the intermediate frequency amplifier and then output. According to the utility model, silent signals are received through the enabling ends of the first power conversion chip A1 and the second power conversion chip A2, and power supply of the coupler circuit and the attenuator circuit of the transmitting link is directly cut off, so that compared with a traditional signal path cut-off mode, signal leakage or residual radiation can be thoroughly avoided, and the transmission efficiency is improved. The transmitting terminal is ensured to completely stop working in a silent state, and the requirement of a high-concealment scene is met.

Description

Technical Field

[0001] This utility model relates to the field of signal processing technology, specifically to a linear frequency modulation transceiver component with a silent function. Background Technology

[0002] In fields such as military reconnaissance and communications, the application of linear frequency modulation (LFM) transceivers requires concealment, making radio silence functionality crucial. However, a Chinese patent (publication number CN218917622U) discloses an ultra-miniaturized LFM transceiver, which has significant drawbacks: it cannot effectively control the power of the transmitted signal, making it easily detectable by enemy radar and failing to meet the needs of covert scenarios. For example, in military operations, traditional components lack precise control over transmission power, making it impossible to promptly shut down or attenuate signal transmission, easily revealing their location and severely impacting mission safety and reliability. This technological gap leaves related equipment vulnerable to enemy detection, limiting its practical application effectiveness. Therefore, this invention proposes a LFM transceiver with a silence function to address these issues. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the defect that the existing linear frequency modulation transceiver components with silent function are difficult to meet the usage requirements in concealed scenarios, thereby providing a linear frequency modulation transceiver component with silent function.

[0004] To address the aforementioned problems, this utility model provides a linear frequency modulation transceiver component with a silent mode function, comprising:

[0005] The transmission link, receiving link, and auxiliary signal processing module are provided. The voltage-controlled oscillator circuit of the transmission link generates microwave signals, which are distributed by the directional coupler circuit, amplified by the power amplifier circuit, and adjusted by the attenuator circuit. The signals are controlled by the silence signal by the coupler circuit and finally transmitted by the isolator circuit, ensuring signal processing and controllable silence of the transmission path.

[0006] The receiving link performs front-end processing on the received signal and mixes it with the local oscillator signal allocated by the directional coupler circuit to generate a beat signal, which is then further amplified by the intermediate frequency amplifier before being output.

[0007] The auxiliary signal processing module generates a dual-frequency standard signal from a portion of the signal separated by the coupling circuit, providing additional signal identification functionality.

[0008] Preferably, the coupler circuit includes: a first power conversion chip A1 and a second power conversion chip A2.

[0009] Preferably, the VIN pin of the first power conversion chip A1 is connected to a +15V power supply and grounded through a first filter capacitor C9 and a second filter capacitor C10; the EN pin is grounded through a first resistor R4 and receives a mute control signal; a second resistor R2 is connected in parallel between the EN pin and the VIN pin; the SW pin outputs a +5.45V voltage through an inductor L1, and a third filter capacitor C11 and a fourth filter capacitor C12 are connected in parallel at the output of the first power conversion chip A1; a fifth capacitor C8 is connected in parallel between the BOOT pin and the SW pin; a fourth resistor R3 is connected in parallel between the FB pin and the SW pin, and grounded through a third resistor R5.

[0010] Preferably, the IN pin of the second power conversion chip A2 is connected to a +5.45V power supply and grounded through the sixth filter capacitor C13 and the seventh filter capacitor C14; the EN pin receives a mute control signal, the OUT pin outputs a +5V voltage, and the output terminal of the second power conversion chip A2 is connected in parallel with the eighth filter capacitor C15 and the ninth filter capacitor C16; the FB pin and the OUT pin are connected in parallel with the fifth resistor R8 and grounded through the sixth resistor R11.

[0011] Preferably, the received signal of the receiving link is processed in the front end by an isolator, a filter, and a low-noise amplifier circuit in sequence, then mixed with the local oscillator signal by a mixer, and output as a beat signal by an intermediate frequency amplifier to complete the processing of the received signal.

[0012] Preferably, the auxiliary signal processing module splits a portion of the signal through a coupler circuit, processes it through a detector and differential amplifier circuit, and generates a dual-frequency standard signal to provide additional signal identification functionality.

[0013] The linear frequency modulation transceiver component with silent operation function provided by this utility model has the following beneficial effects:

[0014] 1. This utility model receives a silence signal through the enable terminals of the first power conversion chip A1 and the second power conversion chip A2, and directly cuts off the power supply to the coupler circuit and attenuator circuit of the transmission link. Compared with the traditional signal path cutting-off method, it can completely avoid signal leakage or residual radiation, and ensure that the transmitter completely stops working in the silence state, meeting the requirements of high concealment scenarios.

[0015] 2. This utility model also enables the power chip to cut off the output within nanoseconds when triggered by a silent signal, resulting in a fast response speed; in non-silent state, multi-stage filtering and feedback regulation circuits ensure stable power output and reduce circuit noise and power consumption.

[0016] 3. This utility model also reduces external discrete components and shrinks the component size by deeply integrating the silent control circuit with the transceiver link, making it suitable for portable devices or embedded systems that are sensitive to size and weight. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection of the linear frequency modulation transceiver component of this utility model;

[0018] Figure 2 This is a schematic diagram of the coupler circuit of this utility model.

[0019] The reference numerals in the attached figures are as follows:

[0020] 1. Voltage-controlled oscillator circuit; 2. Directional coupler circuit; 3. Power amplifier circuit; 4. Attenuator circuit; 5. Coupler circuit; 6. Isolator; 7. Detector; 8. Differential amplifier circuit; 9. Mixer; 10. Intermediate frequency amplifier; 11. Isolator; 12. Filter; 13. Low-noise amplifier circuit. Detailed Implementation

[0021] like Figure 1-2 As shown, this utility model provides a linear frequency modulation transceiver component with a silent function, which includes:

[0022] The transmission link, receiving link, and auxiliary signal processing module are provided. The voltage-controlled oscillator circuit 1 of the transmission link generates a microwave signal, which is distributed by the directional coupler circuit 2, amplified by the power amplifier circuit 3, and its amplitude is adjusted by the attenuator circuit 4. The signal is controlled by the silence signal by the coupler circuit 5, and finally transmitted by the isolator circuit 6 to ensure signal processing and controllable silence of the transmission path.

[0023] The receiving link performs front-end processing on the received signal and mixes it with the local oscillator signal allocated by the directional coupler circuit 2 to generate a beat signal, which is then further amplified by the intermediate frequency amplifier 10 and output.

[0024] The auxiliary signal processing module generates a dual-frequency standard signal from a portion of the signal split from coupling circuit 5, providing additional signal identification functionality. For example... Figure 1-2As shown, a linear frequency modulation transceiver component with a silent function includes a transmit link, a receive link, and an auxiliary signal processing module. The transmit link generates, processes, and transmits the signal in a controlled manner. The receive link processes the received signal. The auxiliary signal processing module provides additional dual-frequency signaling. A high-linearity voltage-controlled oscillator 1 is used as the sweep frequency source. After passing through a microstrip directional coupler 2, part of the signal provides a local oscillator signal to the receiving branch, and the other part passes through a power amplifier 3 to ensure the transmitted signal power meets specifications. The attenuator 4 controls the attenuation of the attenuator circuit according to the control signal provided by the system, thereby controlling the output power level of the transmit branch and achieving the component's silent function. The receiving system uses a low-noise amplifier 13 to reduce the system's noise figure and improve the receiving sensitivity. The received signal is amplified by a low-noise amplifier and then mixed with the local oscillator signal by a mixer 9 to generate a beat frequency. In this circuit, the voltage-controlled oscillator circuit 1 generates a microwave signal source. This signal is input to the directional coupler circuit 2 for distribution. The distributed signal then enters the power amplifier circuit 3, which amplifies the signal power to a suitable level. Subsequently, the signal amplitude is finely adjusted by the attenuator circuit 4. The adjusted signal is then input to the coupler circuit 5, which is controlled by a silence signal to enable or disable the transmission path or suppress the signal. Finally, the signal is output and transmitted through the isolator circuit 6. The isolator circuit 6 prevents reflected waves from interfering with the front-end circuit, ensuring stable operation of the transmission link. It features strong anti-interference capability and high reliability, making it suitable for detection at various altitudes. It also has advantages such as low static current and high functional integration, and can be widely used in radio equipment such as aircraft, radar, and vehicles.

[0025] In some embodiments, the coupler circuit 5 includes a first power conversion chip A1 and a second power conversion chip A2. Specifically, both the first power conversion chip A1 and the second power conversion chip A2 serve as management chips. A1 is model SGM61230XTN6G / TR, and A2 is model SGM2028-ADJYN5G / T. The +15V DC voltage is converted to +5.43V by the first power conversion chip A1. The +5.43V is then converted to +5V by the second power conversion chip in the low-dropout LDO circuit to power the subsequent power amplifier module. The component's mute function is achieved through the VS voltage in the control circuit. When the VS voltage is low, the enable pin of the second power conversion chip is low, the second power conversion chip is not working, there is no 5V output, the subsequent power amplifier module is not working, and the component is in a mute state. When the VS voltage is high, the enable pin of the second power conversion chip is high, the second power conversion chip is working normally, the 5V voltage output is normal, the subsequent power amplifier module is working normally, and the component is in a normal working state.

[0026] Specifically, the coupler circuit 5 receives the silence signal, and this circuit diagram cuts off the power supply to the transmission path from the power supply level by controlling the enable of the power supply chip. This is the specific execution level of the silence signal; that is, the silence signal turns off the power supply to the transmission-related circuits by controlling the enable of the power supply chips A1 and A2, thereby realizing the system-level silence function and ensuring that the transmission path completely stops working when needed, thus meeting the concealment requirements.

[0027] In some implementations, the VIN pin of the first power conversion chip A1 is connected to a +15V power supply and grounded through a first filter capacitor C9 and a second filter capacitor C10; the EN pin is grounded through a first resistor R4 and receives a mute control signal; a second resistor R2 is connected in parallel between the EN pin and the VIN pin; the SW pin outputs a +5.45V voltage through an inductor L1, and a third filter capacitor C11 and a fourth filter capacitor C12 are connected in parallel at the output of the first power conversion chip A1; a fifth capacitor C8 is connected in parallel between the BOOT pin and the SW pin; a fourth resistor R3 is connected in parallel between the FB pin and the SW pin, and the SW pin is grounded through a third resistor R5.

[0028] Specifically, the VIN pin of the A1 chip is connected to the +15V power supply, and the first filter capacitor C9 and the second filter capacitor C10 are connected in parallel to ground to filter out power supply noise and ensure the stability of the input power supply. The EN pin is the enable pin, which receives the mute control signal. This pin is grounded through the first resistor R4, and the second resistor R2 is connected in parallel between the EN pin and the VIN pin. The level control of the enable pin is achieved through resistor voltage division and signal control. The SW pin outputs +5.45V through the inductor L1. The output terminal is connected in parallel with the third filter capacitor C11 and the fourth filter capacitor C12 to further filter out the ripple of the output power supply. The fifth capacitor C8 is connected in parallel between the BOOT pin and the SW pin to assist the stable operation of the internal circuit of the chip. The fourth resistor R3 is connected in parallel between the FB pin and the SW pin, and is grounded through the third resistor R5, forming a feedback regulation circuit to ensure the accuracy of the output voltage.

[0029] In some implementations, the IN pin of the second power conversion chip A2 is connected to a +5.45V power supply and grounded through the sixth filter capacitor C13 and the seventh filter capacitor C14; the EN pin receives a mute control signal, the OUT pin outputs a +5V voltage, and the output terminal of the second power conversion chip A2 is connected in parallel with the eighth filter capacitor C15 and the ninth filter capacitor C16; the FB pin and the OUT pin are connected in parallel with the fifth resistor R8 and grounded through the sixth resistor R11.

[0030] Specifically, the IN pin of the A2 chip is connected to the +5.45V power supply output by A1, and the sixth filter capacitor C13 and the seventh filter capacitor C14 are connected in parallel to ground to filter the input power supply; the EN pin receives the mute control signal to control the enable state of the chip; the OUT pin outputs +5V, and the output terminal is connected in parallel with the eighth filter capacitor C15 and the ninth filter capacitor C16 to ensure the purity of the output power supply; the FB pin and the OUT pin are connected in parallel with the fifth resistor R8, and grounded through the sixth resistor R11 to form a feedback loop to achieve stable regulation of the output voltage.

[0031] Specifically, when the mute control signal is input, the output power can be cut off or maintained by controlling the EN level of the pins of chips A1 and A2; if the mute signal is triggered (such as pulling the EN pin level low), A1 and A2 stop outputting, causing the back-end circuits (such as components related to the transmission link) that rely on this power supply to stop working, thereby realizing the mute function.

[0032] Specifically, the received signal first enters isolator 11 to prevent reflected signals from affecting the front-end circuit. Then, it passes through filter 12 to filter out out-of-band noise, and is amplified by low-noise amplifier circuit 13, completing the front-end processing of the received signal. The processed signal is then input to mixer 9 and mixed with the local oscillator signal allocated by directional coupler circuit 2 to generate a beat signal. The beat signal is further amplified by intermediate frequency amplifier 10 before being output, completing the received signal processing flow.

[0033] Specifically, the coupler circuit 5 outputs a portion of the signal and inputs it into the detector 7. The detector 7 converts the high-frequency signal into a low-frequency signal, which is then input into the differential amplifier circuit 8 for processing. Finally, a dual-frequency standard signal is generated, providing the system with additional signal identification functions, which facilitates the system's identification and processing of signals.

[0034] In this application, the power supply to the coupler circuit and attenuator circuit of the transmission link is directly cut off by receiving the mute signal through the enable terminals of the first power conversion chip A1 and the second power conversion chip A2. Compared with the traditional signal path cutting-off method, it can completely avoid signal leakage or residual radiation, and ensure that the transmitter completely stops working in the mute state, which meets the requirements of high concealment scenarios.

[0035] When the silent signal is triggered in this application, the enable control of the power chip can cut off the output within nanoseconds, resulting in a fast response speed. In the non-silent state, the multi-stage filtering and feedback regulation circuit ensures stable power output and reduces circuit noise and power consumption.

[0036] This application deeply integrates the silent control circuit with the transceiver link, reducing external discrete components and minimizing component size, making it suitable for size- and weight-sensitive portable devices or embedded systems.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A linear frequency modulation transceiver assembly with a mute function, characterized by include: The transmission link, the receiving link, and the auxiliary signal processing module are as follows: the voltage-controlled oscillator circuit (1) of the transmission link generates a microwave signal, which is distributed by the directional coupler circuit (2), amplified by the power amplifier circuit (3), and the amplitude is adjusted by the attenuator circuit (4). The coupler circuit (5) is controlled by the silence signal, and finally the signal is transmitted by the isolator circuit (6), ensuring the signal processing and controllable silence of the transmission path. The receiving link performs front-end processing on the received signal and mixes it with the local oscillator signal allocated by the directional coupler circuit (2) to generate a beat signal, which is then further amplified by the intermediate frequency amplifier (10) and output. The auxiliary signal processing module generates a dual-frequency standard signal from the portion of the signal split off by the coupler circuit (5), providing additional signal identification functionality.

2. The linear frequency modulation transceiver component with silent function according to claim 1, characterized in that: The coupler circuit (5) includes: a first power conversion chip A1 and a second power conversion chip A2.

3. The linear frequency modulation transceiver component with silent function according to claim 2, characterized in that: The first power conversion chip A1 has its VIN pin connected to a +15V power supply and grounded through a first filter capacitor C9 and a second filter capacitor C10; its EN pin is grounded through a first resistor R4 and receives a mute control signal; a second resistor R2 is connected in parallel between the EN pin and the VIN pin; its SW pin outputs a +5.45V voltage through an inductor L1, and a third filter capacitor C11 and a fourth filter capacitor C12 are connected in parallel at the output of the first power conversion chip A1; a fifth capacitor C8 is connected in parallel between the BOOT pin and the SW pin; and a fourth resistor R3 is connected in parallel between the FB pin and the SW pin, and the chip is grounded through a third resistor R5.

4. The linear frequency modulation transceiver component with silent function according to claim 3, characterized in that: The IN pin of the second power conversion chip A2 is connected to a +5.45V power supply and grounded through the sixth filter capacitor C13 and the seventh filter capacitor C14; the EN pin receives the mute control signal, and the OUT pin outputs a +5V voltage. The output terminal of the second power conversion chip A2 is connected in parallel with the eighth filter capacitor C15 and the ninth filter capacitor C16; the FB pin and the OUT pin are connected in parallel with the fifth resistor R8 and grounded through the sixth resistor R11.

5. The linear frequency modulation transceiver component with silent function according to claim 1, characterized in that: The received signal of the receiving link is processed in the front end by isolator (11), filter (12) and low noise amplifier circuit (13) in sequence, and then mixed with local oscillator signal by mixer (9), and output beat signal by intermediate frequency amplifier (10) to complete the processing of the received signal.

6. The linear frequency modulation transceiver component with silent function according to claim 1, characterized in that: The auxiliary signal processing module separates part of the signal through the coupler circuit (5), which is then processed by the detector (7) and the differential amplifier circuit (8) to generate a dual-frequency standard signal, providing additional signal identification function.

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