CN113543285A

CN113543285A - Radio frequency circuit, control method of radio frequency circuit and intercom device

Info

Publication number: CN113543285A
Application number: CN202010306914.6A
Authority: CN
Inventors: 时清利; 杨非; 张玉芹
Original assignee: Hytera Communications Corp Ltd
Current assignee: Hytera Communications Corp Ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2021-10-22
Anticipated expiration: 2040-04-17
Also published as: CN113543285B

Abstract

The application discloses a radio frequency circuit, a control method of the radio frequency circuit and intercom equipment. The radio frequency circuit comprises an amplifier, a first switching circuit and a control circuit, wherein the amplifier is provided with an input end, an output end and a power supply end; the first switch circuit comprises a first end, a second end and a control end, wherein the first end is coupled to the input end, and the second end is coupled to the output end; the control circuit is respectively coupled with the control end, the voltage source and the power end; when the preset condition is met, the control circuit is used for switching off the first switching circuit and enabling the power supply to supply power to the amplifier, or switching on the first switching circuit and enabling the power supply not to supply power to the amplifier. When the radio frequency circuit meets the preset condition, the power consumption of the radio frequency circuit can be reduced or the anti-interference performance of radio frequency equipment is improved.

Description

Radio frequency circuit, control method of radio frequency circuit and intercom device

Technical Field

The present application relates to the field of communications, and in particular, to a radio frequency circuit, a control method for the radio frequency circuit, and an intercom device.

Background

The power consumption of the communication equipment is an important index for evaluating the performance of the communication equipment. For mobile products, on the premise of not changing user experience, power consumption is reduced, the cruising ability of the products is improved, the user experience is improved, and the market competitiveness of the products is improved. If the power consumption of the product is too high and the cruising ability is insufficient, the customer experience is directly influenced, so that the product is in a disadvantage in market competition.

At present, the power consumption of mobile products is reduced by closing corresponding functional modules, and after the functional modules are closed, partial functions of the mobile products or fixed equipment cannot be used.

Disclosure of Invention

The application provides a radio frequency circuit, a control method of the radio frequency circuit and intercom equipment.

A first aspect of the application provides a radio frequency circuit comprising an amplifier having an input, an output and a power supply terminal; the first switch circuit comprises a first end, a second end and a control end, wherein the first end is coupled to the input end, and the second end is coupled to the output end; the control circuit is respectively coupled with the control end, the voltage source and the power end; when the preset condition is met, the control circuit is used for switching off the first switching circuit and enabling the voltage source to supply power to the amplifier, or switching on the first switching circuit and enabling the voltage source not to supply power to the amplifier.

A second aspect of the present application provides an intercom apparatus comprising the radio frequency circuit described in the first aspect above and a battery coupled to the radio frequency circuit to serve as a voltage source for powering the radio frequency circuit.

A third aspect of the present application provides a method for controlling a radio frequency circuit, which is applied to the radio frequency circuit described in the first aspect, and the method includes: judging whether a preset condition is met; if yes, the control switches off the first switch circuit and enables the voltage source to supply power to the amplifier, or switches on the first switch circuit and enables the voltage source not to supply power to the amplifier.

Compared with the prior art, the beneficial effects of this application are: this application makes the voltage source not supply power to the amplifier through control circuit when satisfying preset condition to this makes the amplifier out of work, and then can reduce radio frequency circuit's consumption, and then reduces the consumption of electric quantity, has improved radio frequency circuit's efficiency, or when satisfying preset condition, makes the voltage source supply power for the amplifier, makes the amplifier can work in order to improve local oscillator signal's local oscillator amplitude, has promoted radio frequency equipment's interference immunity.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of a first structure of an embodiment of a radio frequency circuit of the present application;

FIG. 2 is a second schematic diagram of an embodiment of a radio frequency circuit of the present application;

FIG. 3 is a schematic diagram of a third exemplary embodiment of a radio frequency circuit;

FIG. 4 is a schematic diagram of a fourth configuration of an embodiment of the RF circuit of the present application;

FIG. 5 is a schematic diagram of a fifth exemplary embodiment of a radio frequency circuit;

FIG. 6 is a schematic diagram of an embodiment of the intercom device of the present application;

fig. 7 is a flow chart illustrating an embodiment of a method for controlling an rf circuit according to the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a first structural diagram of an embodiment of a radio frequency circuit of the present application. The radio frequency circuit 10 includes an amplifier 11, a first switch circuit 12, a control circuit 13, and a voltage source 14.

In the present embodiment, the amplifier 11 is provided with an input terminal 111, an output terminal 112, and a power source terminal 113. The first switch circuit 12 includes a first terminal 121, a second terminal 122, and a control terminal 123. The first terminal 121 of the first switch circuit 12 is coupled to the input terminal 111 of the amplifier 11, and the second terminal 122 of the first switch circuit 12 is coupled to the output terminal 112 of the amplifier 11. The control circuit 13 is coupled to the control terminal 123, the voltage source 14 and the power source terminal 113 of the amplifier 11, respectively.

A signal received by the rf circuit 10 may enter the amplifier 11 through an input 111 of the amplifier 11 and be output from an output 112 of the amplifier 11 after the signal is processed by the amplifier 11. Similarly, the signal may be output from the second terminal 122 through the first terminal 121 of the first switch circuit 12.

Since the control circuit 13 is coupled to the first switch circuit 12 and the amplifier 11, respectively, the control circuit 13 can control the first switch circuit 12 to be open or closed according to the specific situation, i.e. the control circuit 13 can be used to turn off the first switch circuit 12 or turn on the first switch circuit 12. At the same time, the control circuit 13 may also control whether the voltage source 14 supplies power to the amplifier 11, so that the amplifier 11 can operate, i.e. the control circuit 13 may be adapted to cause the voltage source 14 to supply power to the amplifier 11, or to cause the voltage source 14 not to supply power to the amplifier 11.

In this embodiment, the radio frequency circuit 10 further includes a receiving circuit 15 and a voltage controlled oscillator 16, a mixer 17, and an intermediate frequency filter 18. The receiving circuit 15 is coupled to the control circuit 13, the output 161 of the voltage-controlled oscillator 16 is coupled to the input 111 of the amplifier 11, and the input 172 of the mixer 17 is coupled to the output 112 of the amplifier 11.

The receiving circuit 15 can be used to receive signals and determine the strength of the signals and the quality of the signals. The voltage-controlled oscillator 16 may be used for frequency modulation to ensure that the radio frequency circuit 10 can receive signals and generate local oscillation signals, and the amplifier 11 may increase the local oscillation amplitude of the local oscillation signals, so as to increase the driving amplitude entering the frequency mixer 17 and improve the anti-interference capability of the radio frequency circuit 10. After the signals reach the mixer 17, the mixer 17 generates a plurality of frequency signals including the intermediate frequency signal accordingly, so that the output end of the mixer 17 is coupled to the intermediate frequency filter 18, so that the signals of the plurality of frequencies only output the intermediate frequency signal after passing through the intermediate frequency filter 18, thereby improving the quality of the received signals of the radio frequency circuit 10.

Please continue to refer to fig. 1. The first switch circuit 12 may further include a first switch 124, and the first switch circuit 12 may be turned on or off by controlling the on or off of the first switch 124, that is, the first switch circuit 12 may be controlled to be in an on or off state. Specifically, the control circuit 13 may control the first switch 124 to be adjusted from a closed state to an open state, or from an open state to a closed state, so as to control the first switch circuit 12 to be turned on or off. The control circuit 13 may, for example, issue a control signal such that the first switch 124 of the first switch circuit 12 may be adjusted from a closed state to an open state or from an open state to a closed state according to the control signal. The first switch 124 is, for example, a radio frequency switch.

With the structural schematic diagram of the present embodiment, when the preset condition is satisfied, the control circuit 13 may be configured to turn on the first switch circuit 12 and make the voltage source 14 not supply power to the amplifier 11. At this time, the signal passes through the first switch circuit 12, but does not pass through the amplifier 11. Or the control circuit 13 is arranged to switch off the first switching circuit 12 and to cause the voltage source 14 to supply the amplifier 11. The signal is then processed by the amplifier 11 and output by the amplifier 11.

It can be seen that by controlling the first switch circuit 12 to be turned on and the voltage source 14 not to supply power to the amplifier 11, the amplifier 11 can be turned off when the amplifier 11 does not need to work, so as to reduce the power consumption of the radio frequency circuit 10 while ensuring signal transmission, thereby achieving the effect of saving energy.

The rf circuit 10 is used for receiving and processing signals. For the rf circuit 10 to receive signals, the rf circuit 10 may include a waiting state and a receiving state when operating. The waiting state is a state in which the rf circuit 10 does not receive a signal. The receiving state is a state in which the radio frequency circuit 10 is receiving a signal. When the rf circuit 10 is in a waiting state, or the quality of the signal received by the rf circuit 10 is good, and the amplifier 11 can normally operate without operating the amplifier 11, the amplifier 11 can be turned off, so as to reduce the power consumption of the rf circuit 10 and save the power.

Based on this, in this embodiment, the preset condition may include the following cases:

in the first case: the preset condition is that the rf circuit 10 is in a waiting state.

Since the rf circuit 10 in the standby state does not receive the signal, the amplifier 11 may be turned off to reduce the power consumption of the rf circuit 10 and reduce the power consumption, thereby saving power.

The first switching circuit 12 can be made to be a pass by the control circuit 13 and the voltage source 14 does not supply the amplifier 11. Thereby allowing the signal to pass through the first switching circuit 12 without passing through the amplifier 11.

In a specific implementation scenario, when the rf circuit 10 starts operating, the rf circuit may default to a waiting state, so as to increase the time during which the amplifier 11 does not operate, and reduce the power consumption of the rf circuit 10. Alternatively, the wait state to which the rf circuit 10 is set may be set manually, for example, by a management system of a device to which the rf circuit 10 is applied, so that the rf circuit 10 enters the wait state. Or the receiving circuit 15 determines whether the rf circuit 10 is receiving signals, and if the receiving circuit 15 does not receive signals, it can determine that the rf circuit 10 is in a waiting state. The receiving circuit 15 may send instructions to the control circuit 13 so that the control circuit 13 may control the amplifier 11 and the first switching circuit 12 accordingly according to the state of the radio frequency circuit 10. For example, when the instruction sent by the receiving circuit 15 to the control circuit 13 is that the radio frequency circuit 10 is in the waiting state related information, then the control circuit 13 makes the first switch circuit 12 a path, and the voltage source 14 does not supply power to the amplifier 11.

Further, in the standby state, the output terminal 161 of the vco 16 may be set to output a signal with a predetermined power, so that the sensitivity of the received signal of the rf circuit 10 is at a reasonable level, and the occurrence of the situation that the signal cannot be received is reduced. The predetermined power may be in a range of greater than or equal to-3 decibel-milliwatts (dBm), such as-3 dBm. Of course, the preset power may be-6 dBm, so that the rf circuit 10 may receive the signal.

Since electromagnetic signals are present in almost all our living environments, the radio frequency circuit 10 may be more or less able to receive certain signals. Therefore, whether the amplifier 11 needs to work or not can be determined by judging the condition of the signal received by the radio frequency circuit 10, so that whether the amplifier 11 works or not can be determined by the radio frequency circuit 10 according to the condition of the signal received by the radio frequency circuit 10, the energy consumption of the radio frequency circuit 10 is reduced under the condition that the radio frequency circuit 10 normally works, and the electric energy is saved.

In the second case: the preset condition is that the received signal strength indication of the current signal received by the rf circuit 10 is less than or equal to a first preset value.

When the rf circuit 10 receives a signal, the received signal may be defined as a current signal. When the radio frequency circuit 10 receives the current signal but the Received Signal Strength Indication (RSSI) of the current signal is smaller than the first preset value, it can be considered that the radio frequency circuit 10 does not receive the signal because the RSSI of the signal is too small. In this case, since the rf circuit 10 may consider that no signal is received, it is not necessary to turn on the amplifier 11 to amplify the amplitude of the local oscillation signal, which increases unnecessary power consumption.

In a specific embodiment, the first preset value may be a threshold value for starting the operation of the amplifier 11. The first preset value may be-126 dBm, or-130 dBm. For example, when the threshold value a for starting the operation of the amplifier 11 is set to-126 dBm and the RSSI of the current signal received by the radio frequency circuit 10 is-150 dBm, it is determined that no signal is received at this time. The first preset value may be set according to a specific working environment, or may be calculated according to a certain method.

Specifically, the receiving circuit 15 of the rf circuit 10 may be configured to receive a signal and compare the received signal strength indication of the current signal with the first preset value. For example, after the antenna of the receiving circuit 15 receives the current signal, the modem chip of the receiving circuit 15 determines the relationship between the RSSI value of the received signal and the first preset value, and sends an instruction to the control circuit 13 according to the comparison result, so that the control circuit 13 can control the first switch circuit 12 and the amplifier 11.

In this case, the control circuit 13 may turn on the first switching circuit 12 and cause the voltage source 14 to not supply power to the amplifier 11. Thereby allowing the signal to pass through the first switching circuit 12 without passing through the amplifier 11. Therefore, the amplifier 11 does not work, the power consumption of the radio frequency circuit 10 is reduced, and the electric energy is saved.

In the third case: the preset conditions are that the received signal strength indication of the current signal received by the rf circuit 10 is greater than a first preset value and the signal-to-noise ratio of the current signal is greater than or equal to a second preset value.

In the second case, when the RSSI value of the signal received by the rf circuit 10 is less than or equal to the first preset value, it can be considered that the rf circuit 10 does not receive the signal. Correspondingly, when the RSSI value of the signal received by the rf circuit 10 is greater than the first preset value, the rf circuit 10 may be considered to be in a receiving state when receiving the signal.

When the rf circuit 10 is in a receiving state, if the quality of the signal is good, it means that the amplifier 11 is not needed to amplify the local oscillation amplitude of the local oscillation signal, and the signal is modulated to meet the requirement. At this time, the amplifier 11 may not operate, so as to reduce the power consumption of the rf circuit 10 and save the power.

Based on this, when the rf circuit 10 is in the receiving state, it is able to determine whether the amplifier 11 is operating by determining the quality of the received signal. In this embodiment, the signal-to-noise ratio of the signal is used as a determination index for the quality of the signal. Specifically, when the radio frequency circuit 10 is in a receiving state (the RSSI value of the current signal received by the radio frequency circuit 10 is greater than the first preset value), it is further determined whether the signal-to-noise ratio of the signal received by the radio frequency circuit 10 is greater than or equal to the second preset value. The second preset value may be a value that can normally distinguish the sound quality, that is, when the signal-to-noise ratio of the current signal is greater than the second preset value, the sound mediated by the signal is clear. The second preset value may be 12dB or 14 dB. It is understood that the second preset value can be determined according to a certain method or according to a specific use environment.

When the RSSI value of the current signal received by the rf circuit 10 is greater than the first preset value and the signal-to-noise ratio of the received current signal is greater than the second preset value, it can be considered that the rf circuit 10 is in a receiving state and the quality of the received signal is good, and the operating requirement can be satisfied without the operation of the amplifier 11. At this time, the control circuit 13 may turn on the first switching circuit 12 and cause the voltage source 14 not to supply power to the amplifier 11. Thereby allowing the signal to pass through the first switching circuit 12 without passing through the amplifier 11. Therefore, the amplifier 11 does not work, the power consumption of the radio frequency circuit 10 is reduced, and the electric energy is saved.

Similarly, the receiving circuit 15 of the rf circuit 10 may determine the signal-to-noise ratio of the received current signal, and send an instruction to the control circuit 13 according to the comparison result, so that the control circuit 13 controls the first switch circuit 12 and the amplifier 11.

It can be understood that, when the quality of the signal received by the radio frequency circuit 10 is poor, the amplifier 11 needs to be started to operate, so as to increase the local oscillation amplitude of the local oscillation signal, and enhance the anti-interference performance of the radio frequency circuit 10, so that the signal is modulated and can meet the requirement. On this basis, the preset condition also includes a fourth case where the operation of the amplifier 11 needs to be started.

In a fourth case: the preset conditions are that the received signal strength indication of the current signal received by the rf circuit 10 is greater than a first preset value and the signal-to-noise ratio of the current signal is less than a second preset value.

When the quality of the signal received by the rf circuit 10 is poor, it means that the rf circuit 10 is in a receiving state. That is, the received signal strength of the signal received by the rf circuit 10 at this time is greater than the first preset value, but the signal-to-noise ratio of the received signal is less than the second preset value. Therefore, in this case, the amplifier 11 needs to be turned on. At this time, the control circuit 13 may turn off the first switching circuit 12 and cause the voltage source 14 to supply power to the amplifier 11. Thereby enabling the signal to pass through the amplifier 11 and the amplifier 11 can further process the signal.

Through the four situations described above, whether the amplifier 11 works or not can be correspondingly determined according to the situation of the current signal received by the radio frequency circuit 10, so that the power consumption of the radio frequency circuit 10 can be reduced and the electric energy can be saved under the normal working situation.

Referring to fig. 2 and fig. 3, fig. 2 is a second structural diagram of the radio frequency circuit 10 of the present application, and fig. 3 is a third structural diagram of the radio frequency circuit 10 of the present application. In one possible embodiment, the control circuit 13 further includes an inverter 131, and the inverter 131 is coupled between the power terminal 113 of the amplifier 11 and the control terminal 123 of the first switch circuit 12. Also, as shown in fig. 2, the voltage source 14 is coupled between the inverter 131 and the power source terminal 113 of the amplifier 11. Alternatively, as shown in fig. 3, the inverter 131 is coupled between the control terminal 123 of the first switch circuit 12 and the inverter 131. I.e. the first switching circuit 12 and the amplifier 11 are connected in parallel to the voltage source 14.

When the voltage source 14 is coupled between the inverter 131 and the power source terminal 113 of the amplifier 11, the first switch circuit 12 is connected in series with the inverter 131. When the voltage source 14 is coupled between the control terminal 123 of the first switch circuit 12 and the inverter 131, the inverter 131 is connected in series with the amplifier 11. It can be seen that the inverter 131 is connected in series with one of the first switch circuit 12 and the amplifier 11, and the inverter 131 has the characteristic of inverting the phase of the input signal by 180 degrees, i.e. the input state and the output state are opposite, so that the voltage signal received by the first switch circuit 12 is opposite to the voltage signal received by the amplifier 11.

Specifically, the inverter 131 may be a high-low inverter 131, which outputs a low level when the input level is a high level, and outputs a high level when the input level is a low level. When the voltage source 14 outputs a high voltage, the voltage source 14 may output a high level, and when the voltage source 14 outputs a low voltage, the voltage source 14 may output a low level.

In this embodiment, when the preset conditions to be satisfied are the first, second and third conditions, that is, when the voltage source 14 does not supply power to the amplifier 11, the amplifier 11 is not operated, and the first switch circuit 12 is turned on, when the inverter 131 is connected in series with the amplifier 11, the voltage output from the voltage source 14 may be controlled to be a high voltage signal, and after passing through the inverter 131, the inverter outputs a low voltage (approximately 0 v) signal, and when the amplifier 11 is a low voltage signal, the amplifier 11 may not operate, that is, the voltage source 14 does not supply power to the amplifier 11. The first switch circuit 12 can normally operate when the voltage source 14 outputs a high voltage signal. This makes it possible to turn on the first switching circuit 12 and to leave the voltage source 14 without supplying power to the amplifier 11. When the inverter 131 is connected in series with the first switch circuit 12, the voltage output by the voltage source 14 can be controlled to be a low voltage (approximately 0 v) signal, after passing through the inverter 131, the inverter 131 outputs a high voltage signal, and the amplifier 11 cannot operate under the condition of the low voltage signal, that is, the voltage source 14 does not supply power to the amplifier 11. The first switch circuit 12 can normally operate under the condition of the high voltage signal outputted from the inverter 131. This makes it possible to turn on the first switching circuit 12 and to leave the voltage source 14 without supplying power to the amplifier 11.

When the preset conditions that are met are the fourth condition, that is, the amplifier 11 needs to operate, and the first switch circuit 12 is open, when the inverter 131 is connected in series with the amplifier 11, the voltage output by the voltage source 14 can be controlled to be a low voltage (approximately 0 v) signal, after passing through the inverter 131, the inverter 131 outputs a high voltage signal, the amplifier 11 operates normally under the condition of the high voltage signal, that is, the voltage source 14 supplies power to the amplifier 11, and the first switch circuit 12 cannot operate under the condition that the voltage source 14 outputs the low voltage signal. I.e. so that the first switching circuit 12 is opened and the voltage source 14 supplies the amplifier 11. When the inverter 131 is connected in series with the first switch circuit 12, the voltage output by the voltage source 14 can be controlled to be a high voltage signal, and after passing through the inverter 131, the inverter 131 outputs a low voltage (approximately 0 v) signal, the first switch circuit 12 cannot operate under the condition of the low voltage (approximately 0 v) signal, and the amplifier 11 can operate normally under the condition of the high voltage signal output by the inverter 131. This causes the first switching circuit 12 to open and the voltage source 14 to power the amplifier 11.

By using the inverter 131, the first switch circuit 12 can be controlled to be in an off state or an on state according to the level of the output voltage. Meanwhile, the amplifier 11 can be set in an operating state or a non-operating state according to the voltage level. Therefore, the control of the first switch circuit 12 and the amplifier 11 is realized, and the amplifier 11 can be controlled not to work when a preset condition is met, so that a signal enters the first switch circuit 12, the power consumption of the radio frequency circuit 10 is reduced, and the electric energy is saved.

Referring to fig. 4, fig. 4 is a fourth structural diagram of the rf circuit 10 according to the present application. In one possible embodiment, the control circuit 13 further includes a single pole double throw switch 132. The spdt 132 includes a movable terminal 1321, a first stationary terminal 1322 and a second stationary terminal 1323, the movable terminal 1321 is coupled to the voltage source 14, the first stationary terminal 1322 is coupled to the power source terminal 113 of the amplifier 11, and the second stationary terminal 1323 is coupled to the control terminal 123 of the first switch circuit 12. When the movable terminal 1321 is shifted to the first stationary terminal 1322 and connected to the first stationary terminal 1322, the voltage source 14 may supply power to the amplifier 11, so as to turn off the first switch circuit 12; when the movable terminal 1321 is connected to the second stationary terminal 1323, the voltage source 14 can supply power to the first switch circuit 12 to turn on the first switch circuit 12 without supplying power to the amplifier 11. Thus, the movable terminal 1321 of the spdt 132 can be switched to connect the first stationary terminal 1322 of the spdt 132 or the second stationary terminal 1323 of the spdt 132, so that the first switch circuit 12 is turned off and the voltage source 14 supplies power to the amplifier 11, or the first switch circuit 12 is turned on and the voltage source 14 does not supply power to the amplifier 11.

Based on this, when the preset conditions are the first, second and third conditions, that is, when the voltage source 14 does not supply power to the amplifier 11, the amplifier 11 does not operate, and the first switch circuit 12 is turned on, the second stationary terminal 1323 of the single-pole double-throw switch 132 can be connected to the movable terminal 1321 of the single-pole double-throw switch 132. When the predetermined condition is satisfied as the fourth condition, that is, the amplifier 11 needs to operate, and the first switch circuit 12 is open, the movable terminal 1321 of the single-pole double-throw switch 132 can be connected to the first stationary terminal 1322 of the single-pole double-throw switch 132.

Referring to fig. 5, fig. 5 is a fifth structural diagram of an embodiment of the rf circuit 10 of the present application.

In a possible embodiment, the voltage source 14 comprises a first voltage source 141 and a second voltage source 142, and the control circuit 13 comprises a first control circuit 133 and a second control circuit 134. The first control circuit 133 is coupled between the control terminal 123 of the first switch circuit 12 and the first voltage source 141, and the second control circuit 134 is coupled between the control terminal 123 of the amplifier 11 and the second voltage source 142.

In this embodiment, when the preset conditions that are met are the first, second and third cases, that is, the case where it is necessary to make the voltage source 14 not supply power to the amplifier 11, to make the amplifier 11 not operate, and to turn on the first switch circuit 12, the first control circuit 133 may make the first voltage source 141 supply power to the first switch circuit 12 to turn on the first switch circuit 12, that is, the first control circuit 133 may make the first switch circuit 12 coupled with the first voltage source 141; the second control circuit 134 may cause the second voltage source 142 to not power the amplifier 11, causing the amplifier 11 to be inoperative. Therefore, the signal can pass through the first switch circuit 12, and the amplifier 11 does not work, so that the power consumption of the radio frequency circuit 10 can be reduced, and the electric energy can be saved. When the preset condition that is met is the fourth condition, the first control circuit 133 may cause the first voltage source 141 not to supply power to the first switching circuit 12, so that the first switching circuit 12 is open-circuited; the second control circuit 134 may cause the second voltage source 142 to power the amplifier 11. This enables the second voltage source 142 to power the amplifier 11, i.e. the second control circuit 134 can couple the second voltage source 142 to the amplifier 11. The amplifier 11 can operate, and the signal passes through the amplifier 11, so that the quality of the signal is improved, and the anti-interference performance of the radio frequency circuit 10 is improved.

Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of an intercom device of the present application. The intercom device 60 comprises the radio frequency circuit 61 described in the above embodiments and a battery 62, wherein the battery is coupled to the radio frequency circuit to serve as a voltage source for powering the radio frequency circuit. Of course, the intercom device 60 may also include other batteries to power the other components.

For the case that the control circuit in the radio frequency circuit embodiment of the present application includes the first control circuit and the second control circuit, the battery 62 of the present embodiment may further include a first battery and a second battery to respectively supply power to the first control circuit and the second control circuit.

The four preset cases described above with respect to the rf circuit may be, for an intercom device:

in the first case: the preset condition is that the intercom device is in a standby state.

In the above description about the preset condition, the radio frequency circuit is in the waiting state, and corresponds to the intercom device, that is, the intercom device is in the standby state. When the intercom device is in the standby state, that is, the intercom device is in the working state but does not receive signals currently.

Because the waiting state of the radio frequency circuit corresponds to the standby state of the intercom device, the radio frequency circuit is in the waiting state, that is, the intercom device is in the standby state.

For a detailed description of this situation, please refer to the case where the "preset condition is that the rf circuit is in a waiting state" described in the above embodiment of the rf circuit.

In the second case: the preset condition is that the received signal strength indication of the current signal received by the intercom device is less than or equal to a first preset value.

For an intercom, the intercom may receive the signal. Specifically, a receiving circuit of a radio frequency circuit of the intercom device receives the current signal.

For a specific description of this situation, please refer to the case that the "preset condition is that the received signal strength indication of the current signal received by the rf circuit is less than or equal to the first preset value" described in the above embodiment of the rf circuit.

In the third case: the preset conditions are that the received signal strength indication of the current signal received by the talkback equipment is greater than a first preset value and the signal-to-noise ratio of the current signal is greater than or equal to a second preset value.

For a specific description of this situation, please refer to the above-mentioned rf circuit embodiment to describe the "preset condition is that the received signal strength indication of the current signal received by the rf circuit is greater than the first preset value and the signal-to-noise ratio of the current signal is greater than or equal to the second preset value".

Under the three conditions, the first switch circuit in the radio frequency circuit of the intercom device is switched on, and the amplifier does not work, so that the energy consumption of the intercom device can be reduced, and the cruising performance of the intercom device is improved.

In a fourth case: the preset conditions are that the received signal strength indication of the current signal received by the talkback equipment is greater than a first preset value and the signal-to-noise ratio of the current signal is less than a second preset value.

For a specific description of this situation, please refer to the above-mentioned rf circuit embodiment to describe the "preset condition is that the received signal strength indication of the current signal received by the rf circuit is greater than the first preset value and the signal-to-noise ratio of the current signal is less than the second preset value".

Under the condition, a first switch circuit in a radio frequency circuit of the talkback equipment is disconnected, and the amplifier works to improve the local oscillation amplitude of the local oscillation signal and enhance the anti-interference performance of the talkback equipment, so that the signal is modulated, and the requirement can be met.

In this embodiment, when the radio frequency circuit turns off the amplifier and turns on the first switch circuit, it can be defined that the intercom device is in the power saving mode at this time, that is, when the intercom device satisfies the first, second, and third conditions, the intercom device is in the power saving mode. When the above fourth case is satisfied, the intercom device is defined to be in the normal mode. Through setting up the power saving mode, can directly reflect the state of intercom, make the user of intercom know intercom's operating condition, the user of being convenient for adjusts the mode of intercom according to actual conditions to improve and use experience.

Referring to fig. 7, fig. 7 is a flow chart illustrating an embodiment of a control method of a radio frequency circuit according to the present application. The control method of the radio frequency circuit can be applied to the radio frequency circuit described in the above radio frequency circuit embodiment. Specifically, the method may comprise the steps of:

step S71: and judging whether a preset condition is met.

For a detailed description of the preset condition, please refer to the related description of the above embodiment of the rf circuit, which is not repeated herein. It is understood that the electronic component for determining is not limited, that is, the radio frequency circuit itself may determine whether the predetermined condition is satisfied, or other electronic components, such as other logic components.

Step S72: if yes, the control switches off the first switch circuit and enables the voltage source to supply power to the amplifier, or switches on the first switch circuit and enables the voltage source not to supply power to the amplifier.

When the preset condition is met, the first switch circuit can be controlled to be switched off, and the voltage source supplies power to the amplifier, so that the power consumption of the radio frequency circuit is reduced; or the first switch circuit is switched on and the voltage source does not supply power to the amplifier, so that the local oscillation amplitude of the local oscillation signal is improved by using the amplifier, and the anti-interference performance of the radio frequency equipment is improved.

When the preset condition is not met, other corresponding operations can be performed, for example, the first switching circuit is disconnected, and the amplifier is not powered, so that the equipment is in a non-operating state, and the energy consumption is further reduced.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

1. A radio frequency circuit, comprising:

an amplifier having an input terminal, an output terminal, and a power supply terminal;

a first switch circuit comprising a first terminal, a second terminal and a control terminal, wherein the first terminal is coupled to the input terminal of the amplifier, and the second terminal is coupled to the output terminal of the amplifier;

the control circuit is respectively coupled with the control end, the voltage source and the power end of the amplifier;

when a preset condition is met, the control circuit is used for switching off the first switching circuit and enabling the voltage source to supply power to the amplifier, or switching on the first switching circuit and enabling the voltage source not to supply power to the amplifier.

2. The radio frequency circuit of claim 1,

when the preset condition is that the radio frequency circuit is in a waiting state, the control circuit is used for switching on the first switch circuit and enabling the voltage source not to supply power to the amplifier; or

When the preset condition is that the received signal strength indication of the current signal received by the radio frequency circuit is smaller than or equal to a first preset value, the control circuit is used for switching on the first switch circuit and enabling the voltage source not to supply power to the amplifier; or

When the preset condition is that the received signal strength indication of the current signal received by the radio frequency circuit is greater than a first preset value and the signal-to-noise ratio of the current signal is greater than or equal to a second preset value, the control circuit is used for sending a control signal to switch on the first switch circuit and enable the voltage source not to supply power to the amplifier; or

And when the preset conditions are that the received signal strength indication of the current signal received by the radio frequency circuit is greater than a first preset value and the signal-to-noise ratio of the current signal is less than a second preset value, the control circuit is used for sending a control signal to disconnect the first switch circuit and enable the voltage source to supply power to the amplifier.

3. The radio frequency circuit of claim 2, comprising:

and the receiving circuit is coupled with the control circuit and used for receiving the current signal, comparing the received signal strength indication of the current signal with the first preset value and comparing the signal-to-noise ratio of the current signal with the second preset value.

4. A radio frequency circuit according to any of claims 1 to 3, wherein the control circuit comprises an inverter coupled between a power supply terminal of the amplifier and a control terminal of the first switching circuit, and the voltage source is coupled between the inverter and the power supply terminal of the amplifier or between the control terminal of the first switching circuit and the inverter, such that the voltage signal received by the first switching circuit is opposite to the voltage signal received by the amplifier, thereby causing the first switching circuit to be turned off and the voltage source to power the amplifier, or causing the first switching circuit to be turned on and the voltage source to not power the amplifier.

5. The radio frequency circuit according to any of claims 1 to 3, wherein the control circuit comprises a single-pole double-throw switch, a moving terminal of the single-pole double-throw switch is coupled to the voltage source, a first stationary terminal of the single-pole double-throw switch is coupled to a power supply terminal of the amplifier, and a second stationary terminal of the single-pole double-throw switch is coupled to a control terminal of the first switch circuit, so that the first switch circuit is turned off and the voltage source supplies power to the amplifier, or the first switch circuit is turned on and the voltage source does not supply power to the amplifier by switching the moving terminal of the single-pole double-throw switch to connect the first stationary terminal of the single-pole double-throw switch or the second stationary terminal of the single-pole double-throw switch.

6. The radio frequency circuit according to any of claims 1 to 3, wherein the voltage source comprises a first voltage source and a second voltage source; the control circuit comprises a first control circuit and a second control circuit; the first control circuit is coupled between the control end of the first switch circuit and the first voltage source; the second control circuit is coupled between the control terminal of the amplifier and the second voltage source;

wherein, when the preset condition is satisfied, the first control circuit is used for enabling the first voltage source to supply power to the first switch circuit to switch on the first switch circuit and the second control circuit is used for enabling the second voltage source not to supply power to the amplifier, or the first control circuit is used for enabling the first voltage source not to supply power to the first switch circuit to switch off the first switch circuit and the second control circuit is used for enabling the second voltage source to supply power to the amplifier.

7. The radio frequency circuit of claim 1,

the radio frequency circuit further comprises a voltage-controlled oscillator and a mixer, wherein an output end of the voltage-controlled oscillator is coupled with an input end of the amplifier, and an input end of the mixer is coupled with an output end of the amplifier.

8. The radio frequency circuit of claim 1,

and when the radio frequency circuit is in a waiting state, the output end of the voltage-controlled oscillator outputs a signal with preset power, wherein the preset power is more than or equal to-3 dB milliwatt.

9. A communication device, comprising: the rf circuit of any one of claims 1-8, and a battery coupled to the rf circuit to serve as the voltage source to power the rf circuit.

10. A method for controlling a radio frequency circuit, applied to a radio frequency circuit according to any one of claims 1 to 8, comprising:

judging whether the preset condition is met or not;

and if so, controlling to turn off the first switch circuit and enable the voltage source to supply power to the amplifier, or turn on the first switch circuit and enable the voltage source not to supply power to the amplifier.