Interphone equipment power-saving device and control method thereof

Abstract

The invention discloses an interphone equipment power-saving device and a control method thereof, which overcome the problem that the single endurance time of a battery is shortened as the interphone equipment power-saving device in the prior art does not consider the power consumption optimization of a low-noise amplifier, and comprises a local oscillation unit and the low-noise amplifier, the low-noise amplifier and the local oscillation unit are connected with the mixer, the mixer is connected with the intermediate-frequency signal processing unit, the intermediate-frequency signal processing unit is connected with the digital signal processor, the digital signal processor is connected with the power-saving circuit, and the output end of the power-saving circuit is connected with the low-noise amplifier. The digital signal processor outputs a corresponding low-noise amplifier voltage control signal to the power-saving circuit according to the received signal strength, and the power-saving circuit performs internal resistance switching according to the low-noise amplifier voltage control signal and outputs an LNA control current. The working current of the low-noise amplifier can be adaptively adjusted according to the communication distance, and the power consumption of a receiving end is remarkably reduced on the premise of ensuring the communication quality.

Description

Technical Field

[0001] This invention relates to the field of walkie-talkie equipment technology, and in particular to a power-saving device for walkie-talkie equipment and its control method. Background Technology

[0002] As core communication devices in scenarios such as dedicated communication, emergency communication, industrial dispatching, and outdoor operations, the battery life of walkie-talkies directly determines the continuous working time of the equipment. Therefore, "power saving" has always been one of the core directions of technological optimization in the industry. Existing power-saving technologies for walkie-talkies mainly focus on transmitter power adjustment, standby mode power consumption control, or battery capacity upgrades. For example, CN112118023A describes a method, device, and walkie-talkie for adjusting the operating frequency of a walkie-talkie. This method detects whether the walkie-talkie's operating mode has changed. When a change in the operating mode is detected, the walkie-talkie's operating frequency is adjusted to the frequency corresponding to the changed operating mode. This allows the walkie-talkie to operate at the frequency corresponding to the current operating mode, thus avoiding the problem of the walkie-talkie operating at its maximum operating frequency in an operating mode that does not require the maximum operating frequency to work normally, which leads to high system power consumption and reduced standby time.

[0003] However, existing technologies do not take into account the power consumption optimization of low-noise amplifiers, resulting in redundant power consumption and heat generation of the device when the walkie-talkie is in close-range communication, which shortens the battery's single-charge life. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem in the prior art that the power saving device of walkie-talkie equipment does not consider the power optimization of the low noise amplifier, resulting in redundant power consumption and shortening the battery's single-charge life. The invention provides a power saving device for walkie-talkie equipment and its control method, which can adaptively adjust the operating current of the low noise amplifier according to the communication distance, and significantly reduce the power consumption of the receiving end while ensuring communication quality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A power-saving device for walkie-talkies includes a local oscillator unit and a low-noise amplifier (LNA) connected to an antenna. The LNA and the local oscillator unit are connected to a mixer. The mixer is connected to an intermediate frequency (IF) signal processing unit. The IF signal processing unit is connected to a digital signal processor (DSP). The DSP is connected to a power-saving circuit. The output of the power-saving circuit is connected to the LNA. The DSP outputs a corresponding LNA voltage control signal to the power-saving circuit based on the received signal strength. The power-saving circuit switches its internal resistance according to the LNA voltage control signal and outputs an LNA control current.

[0006] Preferably, the power-saving circuit includes a MOSFET, the gate of which is connected to a digital signal processor, the source of which is connected to a second voltage divider resistor, and the drain of which is connected to a third resistor and a first voltage divider resistor. The third resistor is connected to the digital signal processor, and the first voltage divider resistor is connected to the second voltage divider resistor.

[0007] Preferably, the low-noise amplifier is a transistor, and the collector of the transistor is connected to the first voltage divider resistor and the second voltage divider resistor of the power-saving circuit.

[0008] Preferably, the base of the transistor is connected to a first impedance matching circuit, and the collector of the transistor is connected to a second impedance matching circuit.

[0009] Preferably, the system includes a filtering unit comprising a first-stage electrically tunable filter and a second-stage electrically tunable bandpass filter. The first-stage electrically tunable filter is connected to an antenna and a low-noise amplifier, and the second-stage electrically tunable bandpass filter is connected to a low-noise amplifier and a mixer. The mixer is connected to an intermediate frequency signal processing unit.

[0010] Preferably, the local oscillation unit includes a phase-locked loop, which is connected to a voltage-controlled oscillator and a local oscillator amplifier, and the output of the local oscillator amplifier is connected to the input of a mixer.

[0011] A method for controlling a power-saving device in a walkie-talkie includes: Collect the received signal strength indication signal of the walkie-talkie device, and compare the received signal strength indication signal with a preset signal threshold; The voltage output is controlled based on the comparison results, and the operating state of the MOSFET is switched based on the voltage output results. Adjust the bias resistor according to the operating state of the MOSFET, calculate the LNA operating current, and adjust the LNA operating current according to the calculation results.

[0012] Preferably, if the walkie-talkie received signal is detected to fluctuate within the RSSI hysteresis threshold, the current mode of the previous state is maintained.

[0013] Preferably, if the received signal strength indicator signal is less than or equal to the threshold, the digital signal processor outputs a high level and the MOSFET is turned on; if the received signal strength indicator signal is greater than the threshold, the digital signal processor outputs a low level and the MOSFET is turned off.

[0014] Preferably, if the MOSFET is turned on, the total bias resistance is the reciprocal of the sum of the reciprocals of the first and second resistors, and the LNA bias current is the ratio of the low-noise amplifier supply voltage to the total bias resistance; if the MOSFET is turned off, the LNA bias current is the ratio of the low-noise amplifier supply voltage to the first resistor.

[0015] Therefore, this invention has the following beneficial effects: it constructs a low-noise amplifier dynamic control circuit with "distance-current" linkage, and achieves adaptive adjustment of the low-noise amplifier current under different communication distances through hardware-level voltage control and resistor network switching. The core circuit only requires the addition of one MOSFET and two voltage divider resistors, resulting in low component costs and a simple circuit structure. It can be directly integrated into the existing walkie-talkie receiver link without significant modifications to the overall hardware architecture. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the receiving link architecture of the walkie-talkie device in this invention.

[0017] Figure 2 This is a schematic diagram of the power-saving circuit in this invention.

[0018] Figure 3 This is a flowchart of the steps of the control method for the power-saving device of the walkie-talkie equipment in this invention.

[0019] In the diagram: 1. First-stage electrically adjustable filter; 2. Low-noise amplifier; 3. Second-stage electrically adjustable bandpass filter; 4. Digital signal processor; 5. Phase-locked loop; 6. Local oscillator amplifier; 7. Intermediate frequency amplifier; 8. Intermediate frequency filter; 9. Intermediate frequency signal processing unit; 10. Mixer. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1: This embodiment provides a power-saving device for walkie-talkie equipment, such as... Figure 1 As shown, it includes: a walkie-talkie device receiving link and a power-saving circuit, wherein the walkie-talkie device receiving link and the power-saving circuit are connected.

[0021] The walkie-talkie receiving link includes an antenna, a filtering unit, a low-noise amplifier 2, a local oscillator unit, an intermediate frequency signal processing unit 9, a digital signal processor 4, and a mixer 10. The filtering unit is connected to the antenna. The low-noise amplifier is connected to the filtering unit, the mixer, and the intermediate frequency signal processing unit. The local oscillator unit is connected to the mixer. The radio frequency signal and the local oscillator signal are mixed to produce an intermediate frequency signal. The intermediate frequency signal processing unit is connected to the digital signal processor. The digital signal processor is connected to the power-saving circuit. The power-saving circuit is connected to the low-noise amplifier.

[0022] During operation, the radio frequency signal received by the walkie-talkie enters through the antenna port, is filtered by the filtering unit, and then amplified by the low-noise amplifier. The amplified signal is then mixed with the local oscillator signal output by the local oscillator unit to obtain the intermediate frequency signal. The intermediate frequency signal enters the intermediate frequency signal processing unit, which converts the intermediate frequency radio frequency signal into a digital signal and detects the received signal strength signal. The intermediate frequency signal processing unit then transmits the digital signal and the received signal strength indication signal together to the digital signal processor.

[0023] The power-saving device for walkie-talkie equipment adapted to load changes provided in this embodiment is used to solve the problem of redundant power consumption caused by the fixed operating current of the low noise amplifier (LNA) in existing walkie-talkies. By constructing a dynamic control circuit for the low noise amplifier that links "distance and current", the device achieves adaptive adjustment of the low noise amplifier current under different communication distances through hardware-level voltage control and resistor network switching.

[0024] The specific structure of the power-saving device for walkie-talkie equipment that adapts to load changes, provided in this embodiment, will be further explained below.

[0025] Existing power-saving technologies for walkie-talkies mainly focus on power regulation at the transmitter (such as reducing transmission power during short-range communication) and power consumption control in standby mode (such as turning off unnecessary peripherals and reducing the operating frequency of the baseband chip), but generally neglect the power consumption optimization of the key component at the receiver—the low-noise amplifier (LNA).

[0026] The low-noise amplifier (LNOA) is a core module of the walkie-talkie receiver link. Its function is to amplify weak received signals while suppressing noise interference, directly affecting the overall receiver sensitivity and communication range. In existing technologies, the operating current of walkie-talkie LNOAs is typically a fixed value (generally maintained at 15-20mA). Regardless of whether the walkie-talkie is in a short-range or long-range communication scenario, it operates at a high current to "meet the maximum communication distance." When the walkie-talkie is in short-range communication (such as indoor dispatching or short-range collaboration), the received signal strength (RSSI) is relatively strong, and the high current operation of the LNOA exceeds actual requirements. This not only causes redundant power consumption but also increases equipment heat generation and shortens battery life per charge.

[0027] Based on the above problems, this embodiment provides a power-saving device for walkie-talkie equipment, and constructs a hardware power-saving scheme based on dynamic current adjustment of a low-noise amplifier. By adaptively adjusting the operating current of the low-noise amplifier according to the communication distance, the power consumption of the receiving end is significantly reduced while ensuring communication quality, thus filling the gap in power-saving technology for walkie-talkie receiving links.

[0028] Specifically, such as Figure 1As shown, the filtering unit includes a first-stage electrically tunable filter and a second-stage electrically tunable bandpass filter. The input of the first-stage electrically tunable filter is connected to the antenna, and the output of the first-stage electrically tunable filter is connected to the input of the low-noise amplifier. The output of the low-noise amplifier is connected to the input of the second-stage electrically tunable bandpass filter, and the output of the second-stage electrically tunable bandpass filter is connected to the input of the intermediate frequency signal processing unit. The output of the local oscillator unit is connected to the input of the intermediate frequency signal processing unit, and the output of the intermediate frequency signal processing unit is connected to the input of the digital signal processor. The output of the digital signal processor is connected to the control voltage input of the low-noise amplifier MOS transistor in the power-saving circuit.

[0029] During operation, the received radio frequency signal enters through the antenna port and first passes through a first-stage electrically tunable filter to remove out-of-band interference signals, achieving initial purification of the input signal. Subsequently, the signal passes through a low-noise amplifier (LNA), and the amplified signal then passes through a second-stage electrically tunable bandpass filter to further filter out the self-noise, nonlinear harmonics, and residual out-of-band interference generated during the operation of the LNA. Then, the filtered signal is mixed with the local oscillator signal output from the phase-locked loop (PLL) and amplified by the LNA amplifier to obtain an intermediate frequency (IF) signal. After amplification, the IF signal enters an IF filter, where out-of-band signals are filtered out. After being amplified by the IF amplifier, it is input to the IF signal processing unit, which performs the conversion of the IF radio frequency signal to a digital signal and simultaneously detects the Received Signal Strength Indication (RSSI) signal. Finally, the digital signal and the RSSI signal are transmitted together to a digital signal processor (DSP) for subsequent calculations and control.

[0030] RSSI detection is achieved through the combined action of an intermediate frequency digital signal processing unit and a digital signal processor, controlled by software.

[0031] Specifically, such as Figure 2 As shown, in this embodiment, the power-saving circuit includes a MOSFET Q1, resistors R1, R3, and R4. The gate of the MOSFET Q1 is connected to the first terminal of resistor R1 and the output terminal of the digital signal processor. The drain of the MOSFET Q1 is connected to the second terminal of resistor R1 and the first terminal of resistor R3. The second terminal of resistor R3 is connected to the first terminal of resistor R4. The second terminal of resistor R4 is connected to the source of the MOSFET Q1.

[0032] In this embodiment, the low-noise amplifier is transistor Q2. The base of transistor Q2 is connected to the first impedance matching circuit, serving as the signal input terminal of the low-noise amplifier. The emitter of transistor Q2 is grounded, and the collector of transistor Q2 is connected to the second terminal of resistor R4 and the second terminal of resistor R3.

[0033] The collector of transistor Q2 is connected to the second impedance matching network, serving as the signal output terminal of the low-noise amplifier.

[0034] Through the above device and circuit structure, this embodiment can realize the control logic of "RSSI detection → control voltage output → MOS transistor switching → bias resistor adjustment → LNA current change", thereby achieving power-saving control under different communication distances.

[0035] The specific process is as follows, including: (1) Power saving control of walkie-talkie equipment in long-distance communication scenarios.

[0036] In this embodiment, RSSI less than or equal to -85dBm is considered as a long-distance communication scenario.

[0037] The triggering condition is: the walkie-talkie receives a weak signal (i.e., RSSI is less than or equal to -85dBm), and the low-noise amplifier (LNA) needs to operate at maximum gain to ensure receiving sensitivity and communication distance.

[0038] The control logic is as follows: when the digital signal processor detects that RSSI is less than or equal to -85dBm, the digital signal processor outputs a high level to the power saving circuit, and at this time the gate of MOSFET Q1 is energized and turned on.

[0039] Resistor switching: After the gate of MOSFET Q1 is energized and turned on, bias resistors R3 and R4 are connected in parallel. In this case, the total bias resistance is the reciprocal of the sum of the reciprocals of the values ​​of bias resistors R3 and R4.

[0040] In this embodiment, the high level is 1.8V or 3.3V, the resistance of bias resistor R3 is 680Ω, and the resistance of bias resistor R4 is 330Ω. Substituting the parameter values, the total bias resistance is calculated to be approximately 222Ω.

[0041] Current Calculation: The bias current of the low-noise amplifier is determined by the supply voltage of the low-noise amplifier (3.3V in this embodiment) and the total bias resistance. The bias current is the ratio of the supply voltage to the total bias resistance. Substituting the parameter values, the calculated bias current is approximately 10mA.

[0042] Effect: When the low-noise amplifier operates at the bias current calculated above, the gain reaches its maximum value, ensuring the receiving sensitivity and communication quality for long-distance communication.

[0043] (2) Power saving control of walkie-talkie equipment in short-range communication scenarios.

[0044] In this embodiment, an RSSI greater than -80dBm is considered a long-distance communication scenario.

[0045] The triggering condition is: the walkie-talkie receives a weak signal (i.e., RSSI is greater than -80dBm), and there is no need for the low-noise amplifier (LNA) to operate at maximum gain. Appropriately reducing the gain will not affect the communication quality.

[0046] The control logic is as follows: when the digital signal processor detects that RSSI is greater than -80dBm, the digital signal processor outputs a low level (0V) to the power saving circuit, and at this time the gate of MOSFET Q1 is de-energized and turned off.

[0047] Resistor switching: After the gate of MOSFET Q1 is de-energized and turned off, the bias resistor R4 is not connected to the power saving circuit, and only the bias resistor R3 is retained (in this embodiment, the resistance value of resistor R3 is 680Ω).

[0048] In this embodiment, the high level is 1.8V or 3.3V.

[0049] Current Calculation: The bias current of the low-noise amplifier is determined by the supply voltage of the low-noise amplifier (3.3V in this embodiment) and the total bias resistor. The bias current is the ratio of the supply voltage to the total bias resistor. That is, in this case, the bias current is the ratio of the supply voltage to the bias resistor R3. Substituting the resistance of R3 (680Ω), the calculated bias current is approximately 5mA.

[0050] Results: The operating current of the low-noise amplifier is reduced to about 5mA, and 10mA is reduced in long-distance scenarios. The receiving gain is moderately reduced, but the RSSI is still strong and the communication bit error rate is still ≤0.1%, which fully meets the requirements of short-distance communication and achieves significant power saving.

[0051] (3) Transitional scenes.

[0052] Its control logic is as follows: In order to avoid current fluctuations caused by frequent switching, an RSSI hysteresis threshold (5dBm) is set. Within this range, the current mode of the previous state is maintained (i.e., if it was previously a long-distance mode, it is maintained at 15mA, and if it was previously a short-distance mode, it is maintained at 5mA), thereby improving the stability of the circuit operation.

[0053] The hysteresis threshold refers to the threshold when the detected field strength signal RSSI fluctuates within 5dB, even when moving from near to far distance; the threshold has no time limit and is only related to the detected RSSI.

[0054] This embodiment also provides a control method for a power-saving device for walkie-talkies, which controls the power-saving device of the walkie-talkie and divides the current communication scenario into a long-distance communication scenario and a short-distance communication scenario according to the strength of the RSSI signal, and outputs different low-noise amplifier operating currents under different communication scenarios.

[0055] Specifically, such as Figure 3As shown, a control method for a power-saving device in a walkie-talkie includes the following steps: Step (1): Collect the received signal strength indication signal of the walkie-talkie device and compare the received signal strength indication signal with the preset signal threshold.

[0056] If the received signal strength indicator signal is less than or equal to a preset first signal threshold, it is considered a long-distance communication scenario, and the digital signal processor outputs a high level to the MOSFET. If the received signal strength indicator signal is greater than the preset first signal threshold, it is considered a short-distance communication scenario, and the digital signal processor outputs a low level to the MOSFET.

[0057] In this embodiment, the method further includes: if the received signal strength indication signal is between a first signal threshold and a second signal threshold, the output level of the digital signal processor remains unchanged. The interval between the first signal threshold and the second signal threshold is the RSSI hysteresis threshold.

[0058] Step (2): Control the voltage output according to the comparison results, and switch the working state of the MOSFET according to the voltage output results.

[0059] If the digital signal processor outputs a high level, the MOSFET is turned on; if the digital signal processor outputs a low level, the MOSFET is turned off.

[0060] Step (3): Adjust the bias resistor according to the working state of the MOSFET, calculate the working current of the LNA, and adjust the working current of the LNA according to the calculation results.

[0061] If the MOSFET is on, the total bias resistance is the reciprocal of the sum of the reciprocals of bias resistance R3 and bias resistance R4, and the LNA bias current is the ratio of the low-noise amplifier supply voltage to the total bias resistance. If the MOSFET is off, the LNA bias current is the ratio of the low-noise amplifier supply voltage to the bias resistance R3.

[0062] Based on the above, the power-saving device and control method for walkie-talkie equipment that adapts to load changes provided in this embodiment are mainly used to solve the following technical problems: (1) Avoid the energy waste caused by the low-noise amplifier operating at high current (15mA level) during close-range communication, and reduce the power consumption of the receiver.

[0063] (2) Ensure that the communication quality of the walkie-talkie is not affected during dynamic current adjustment: maintain high sensitivity for long-distance communication and reduce sensitivity only moderately (within an acceptable range) for short-distance communication.

[0064] (3) Dynamic control is achieved through pure hardware circuits, without relying on software algorithms, with faster response speed (microsecond level), stronger anti-electromagnetic interference capability, and adaptability to complex working environments.

[0065] Therefore, the power-saving device and control method for walkie-talkie equipment that adapts to load changes provided in this embodiment have the following beneficial effects: (1) Significantly reduce power consumption and extend battery life: During close-range communication, the current of the low-noise amplifier is reduced from 15mA to 5mA, the current of a single module is reduced by 66.7%, and the power consumption of the whole device is reduced by 12%-18% (according to actual tests, the battery life of a walkie-talkie equipped with a 2000mAh battery can be extended from 8 hours to 9-9.5 hours).

[0066] (2) Balancing communication quality and flexibility: Maintaining a high current (15mA) for long-distance communication ensures that the receiving sensitivity and communication distance are not affected; for short-distance communication, only the sensitivity is moderately reduced (e.g., when RSSI≥-80dBm, the communication error rate is still ≤0.1%), which fully meets the requirements of short-distance communication.

[0067] (3) Hardware control with high reliability: No software is required for control. Current switching is achieved through hardware logic of MOS transistors and resistor networks. The response speed is fast (microsecond level) and is not affected by software vulnerabilities or electromagnetic interference. It is suitable for complex scenarios such as outdoor and industrial environments.

[0068] (4) Low cost and easy integration: The core circuit only requires the addition of 1 MOS transistor and 2 voltage divider resistors, and the component cost increases by no more than 1 yuan. Moreover, the circuit structure is simple and can be directly integrated into the existing walkie-talkie receiving link without the need for major modifications to the overall hardware architecture.

[0069] Example 2: This embodiment provides a power-saving device for walkie-talkie equipment. Based on the first embodiment, it adds a specific circuit structure for the power-saving circuit and adds two amplifiers to the receiving link of the walkie-talkie equipment.

[0070] A power-saving device for walkie-talkie equipment, such as Figure 1 As shown, it includes: a walkie-talkie receiving link and a power-saving circuit. The power-saving circuit is integrated into the walkie-talkie receiving link, which adopts a classic superheterodyne structure circuit.

[0071] Specifically, the walkie-talkie receiver link includes an antenna, a first-stage electrically tunable filter 1, a low-noise amplifier 2, a second-stage electrically tunable bandpass filter 3, a digital signal processor 4, a phase-locked loop 5, a local oscillator amplifier 6, an intermediate frequency amplifier 7, an intermediate frequency filter 8, an intermediate frequency signal processing unit 9, and a mixer 10. The input of the first-stage electrically tunable filter is connected to the antenna, the output of the first-stage electrically tunable filter is connected to the input of the low-noise amplifier, the output of the low-noise amplifier is connected to the input of the second-stage electrically tunable bandpass filter, the signal output of the second-stage electrically tunable bandpass filter is connected to the input of the mixer, and the output of the local oscillator amplifier is connected to... The mixer input is connected to the local oscillator amplifier (LOA) and mixes the signal from the second-stage electrically tunable bandpass filter with the signal from the LOA. The LOA output is then fed into the intermediate frequency (IF) filter. The IFA output is connected to the IFA input, which in turn is connected to the IF signal processing unit (IFS) input. The IFS output is connected to the digital signal processor (DSP) input via the SPI interface. The DSP output is connected to a power-saving circuit. The LOA input is connected to the receiver's phase-locked loop (PLL), which in turn is connected to the DSP via the SPI interface.

[0072] like Figure 2 As shown, the power-saving circuit includes four ports: 3R3_LNA, LNA_Icontr, LNA_IN, and LNA_OUT. The 3R3_LNA port is the input power supply voltage of the low-noise amplifier and is controllable. The LNA_Icontr port is the input control voltage of the MOSFET Q1 of the low-noise amplifier, which is typically 1.8V or 3.3V and is controllable. The LNA_IN port is the input signal terminal of the low-noise amplifier, and the LNA_OUT port is the output signal terminal of the low-noise amplifier.

[0073] The power-saving circuit includes: resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, and R11; capacitors C1, C2, C3, C4, C5, C6, C7, and C8; inductors L1, L2, L3, L4, and L5; MOSFET Q1; and transistor Q2. The gate of MOSFET Q1 is the LNA_Icontr terminal. Resistors R10, R9, and L4 form a second LC filter network, and capacitors C7, C8, and L5 form a first LC network.

[0074] Specifically: The gate of MOSFET Q1 is connected to the first terminal of resistor R1. The second terminal of resistor R1 is connected to the drain of MOSFET Q1, the first terminals of resistors R3, R2, and R6, and the first terminal of inductor L1. The second terminal of resistor R3 is connected to the first terminals of resistors R4 and R5, and the first terminal of inductor L2. The second terminal of resistor R4 is connected to the source of MOSFET Q1. The second terminal of resistor R2 is connected to the first terminals of capacitors C1 and C2, and the first terminal of inductor L1. The second terminal of capacitor C2 and the second terminal of inductor L1 are both grounded. The second terminal of inductor L1 is the 3R3_LNA terminal. The second terminals of resistor R6 and inductor L3 are both connected to the first terminals of capacitor C4 and resistor R8. The second terminal of capacitor C4 is grounded. The second terminal of resistor R8 is connected to the first terminals of resistor R11, capacitor C7, and capacitor C8 respectively. The second terminals of capacitor C8 and resistor R11 are both grounded. The second terminal of capacitor C7 is connected to the first terminal of inductor L5 and is the LNA_IN terminal. The second terminal of inductor L5 is grounded. The second terminal of inductor L2 and the second terminal of resistor R5 are both connected to the first terminals of capacitor C3, capacitor C6, and the collector of transistor Q2. The second terminal of capacitor C3 is connected to the first terminal of resistor R7. The second terminal of resistor R7 is connected to the base of transistor Q2 and the second terminal of resistor R8. The second terminal of capacitor C6 is connected to the first terminal of resistor R10 and the first terminal of inductor L4. The second terminal of resistor R10 is grounded. The second terminal of inductor L4 is connected to the first terminals of resistor R9 and capacitor C5 respectively. The second terminal of resistor R9 is grounded. The second terminal of capacitor C5 is the LNA_OUT terminal.

[0075] The above circuitry enables hardware-level voltage control and resistor network switching, allowing for adaptive adjustment of the low-noise amplifier current under different communication distances, thereby reducing the power consumption of the walkie-talkie and extending its battery life.

[0076] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A power-saving device for walkie-talkies, characterized in that, The device includes a local oscillator unit and a low-noise amplifier connected to an antenna. The low-noise amplifier and the local oscillator unit are connected to a mixer. The mixer is connected to an intermediate frequency (IF) signal processing unit. The IF signal processing unit is connected to a digital signal processor (DSP). The DSP is connected to a power-saving circuit. The output of the power-saving circuit is connected to the low-noise amplifier. The DSP receives the signal strength and outputs a corresponding low-noise amplifier voltage control signal to the power-saving circuit. The power-saving circuit switches its internal resistance according to the low-noise amplifier voltage control signal and outputs an LNA control current.

2. The power-saving device for walkie-talkies according to claim 1, characterized in that, The power-saving circuit includes a MOSFET, the gate of which is connected to a digital signal processor, the source of which is connected to a second voltage divider resistor, and the drain of which is connected to a third resistor and a first voltage divider resistor. The third resistor is connected to the digital signal processor, and the first voltage divider resistor is connected to the second voltage divider resistor.

3. A power-saving device for walkie-talkies according to claim 1 or 2, characterized in that, The low-noise amplifier is a transistor, and the collector of the transistor is connected to the first voltage divider resistor and the second voltage divider resistor of the power-saving circuit.

4. The power-saving device for walkie-talkies according to claim 3, characterized in that, The base of the transistor is connected to a first impedance matching circuit, and the collector of the transistor is connected to a second impedance matching circuit.

5. A power-saving device for walkie-talkies according to claim 1, characterized in that, The system includes a filtering unit, which comprises a first-stage electrically tunable filter and a second-stage electrically tunable bandpass filter. The first-stage electrically tunable filter is connected to an antenna and a low-noise amplifier, and the second-stage electrically tunable bandpass filter is connected to a low-noise amplifier and a mixer. The mixer is connected to an intermediate frequency signal processing unit.

6. A power-saving device for walkie-talkies according to claim 1, 2, or 5, characterized in that, The local oscillation unit includes a phase-locked loop, which is connected to a voltage-controlled oscillator and a local oscillator amplifier. The output of the local oscillator amplifier is connected to the input of a mixer.

7. A control method for a power-saving device for a walkie-talkie, applied to the power-saving device for a walkie-talkie as described in any one of claims 1-6, characterized in that, include: Collect the received signal strength indication signal of the walkie-talkie device, and compare the received signal strength indication signal with a preset signal threshold; The voltage output is controlled based on the comparison results, and the operating state of the MOSFET is switched based on the voltage output results. Adjust the bias resistor according to the operating state of the MOSFET, calculate the LNA operating current, and adjust the LNA operating current according to the calculation results.

8. The control method for a power-saving device of a walkie-talkie according to claim 7, characterized in that, If the walkie-talkie received signal is detected to fluctuate within the RSSI hysteresis threshold, the current mode of the previous state is maintained.

9. A control method for a power-saving device for a walkie-talkie according to claim 7 or 8, characterized in that, If the received signal strength indicator signal is less than or equal to the first signal threshold, the digital signal processor outputs a high level and the MOSFET is turned on; if the received signal strength indicator signal is greater than the second signal threshold, the digital signal processor outputs a low level and the MOSFET is turned off.

10. The power-saving device for walkie-talkie equipment according to claim 9, characterized in that, If the MOSFET is turned on, the total bias resistance is the reciprocal of the sum of the reciprocals of the first and second resistances, and the LNA bias current is the ratio of the low-noise amplifier supply voltage to the total bias resistance. If the MOSFET is off, the LNA bias current is the ratio of the low-noise amplifier supply voltage to the first resistor.

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