Switching circuit, radio frequency device and electronic equipment

Abstract

The invention provides a switching circuit, a radio frequency device and electronic equipment. The switching circuit comprises a first switch, a signal detection module and an isolation enhancement module, the first switch comprises a plurality of fixed ends, each fixed end is connected with an output line, a detection end of the signal detection module is connected with the output line, and the isolation enhancement module is connected with the fixed end of the first switch. The output end of the signal detection module is connected with the input end of the isolation enhancement module. By arranging the signal detection module and the isolation enhancement module, the state of the signal output by each fixed end is detected under the condition that the first switch outputs the signal, so that the signal coupling condition is monitored, and when the interference is detected, namely, the enhancement condition is met, the isolation enhancement operation is executed; therefore, the isolation degree between the fixed ends is improved, interference coupling is reduced, and deterioration of sensitivity is avoided.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency, and in particular to a switching circuit, a radio frequency device and an electronic device. Background Art

[0002] In the RF front-end and back-end, SPXT (Single Pole X Throw) needs to be set to realize line switching; for example, in the 5G RF front-end solution, LNA BANK can support the transmission of multiple RF channels, and the switch integrated in LNA BANK controls the on-off of the RF channel; in actual applications, if the isolation of the switch is poor, it cannot provide sufficient isolation for the signal coupled from the RF power amplifier. On the other hand, if the isolation of the switch integrated in the RF power amplifier is poor, it will cause a strong interference signal to be coupled from the switch ports inside the RF power amplifier, resulting in sensitivity degradation. Summary of the invention

[0003] The main purpose of the present invention is to provide a switch circuit, a radio frequency device and an electronic device, aiming to solve the problem of low switch isolation in the prior art leading to generation of interference signals and degradation of sensitivity.

[0004] To achieve the above object, the present invention provides a switch circuit, the switch circuit comprising a first switch, a signal detection module and an isolation enhancement module; the first switch comprises a plurality of fixed ends, each of the fixed ends is respectively connected to an output line, the detection end of the signal detection module is connected to the output line, the isolation enhancement module is connected to the fixed end of the first switch, and the output end of the signal detection module is connected to the input end of the isolation enhancement module; wherein:

[0005] The signal detection module is used to generate a detection signal according to a signal output by the fixed end of the first switch when the fixed end of the first switch is closed, and send the detection signal to the isolation enhancement module;

[0006] The isolation enhancement module is used to perform an isolation enhancement operation on the disconnected fixed end of the first switch when the detection signal meets the enhancement condition.

[0007] Optionally, the signal detection module includes a plurality of signal detection subunits, each of which is connected to one of the output lines, and the signal detection subunit is connected to the isolation enhancement module; wherein:

[0008] The signal detection subunit is used to generate a detection sub-signal according to an output signal on the output line, wherein the detection signal is obtained based on the detection sub-signal.

[0009] Optionally, each of the signal detection subunits is connected to an input terminal of the isolation enhancement module respectively; wherein:

[0010] The signal detection subunit is used to generate the detection sub-signal according to the output signal on the output line, and send the detection sub-signal to the isolation enhancement module.

[0011] Optionally, each of the signal detection subunits is cascaded in sequence and connected to the input end of the isolation enhancement module; wherein:

[0012] The signal detection subunit is used to generate the detection sub-signal according to the output signal on the output line, wherein the detection sub-signals are superimposed to obtain the detection signal.

[0013] Optionally, the signal detection subunit is a directional coupler; wherein the input end of the directional coupler is connected to

[0014] The through-end is connected to the output line, wherein the input end of the directional coupler is close to the fixed end, and the through-end is far away from the fixed end;

[0015] The directional coupler is cascaded through a coupling end and an isolation end of the directional coupler, wherein the coupling end of the directional coupler is close to the isolation enhancement module, and the isolation end of the directional coupler is far away from the isolation enhancement module.

[0016] Optionally, the isolation enhancement module includes an enhancement trigger unit and an enhancement execution unit; wherein the input end of the enhancement trigger unit serves as the input end of the isolation enhancement module, the output end of the enhancement trigger unit is connected to the input end of the enhancement execution unit, and the enhancement execution unit is connected to the fixed end of the first switch; wherein:

[0017] The enhancement trigger unit is used to set the enhancement condition and send an execution signal to the enhancement execution unit when the detection signal meets the enhancement condition;

[0018] The enhanced execution unit is used to perform an isolation enhancement operation on the disconnected fixed end of the first switch when receiving the execution signal.

[0019] Optionally, the enhanced trigger unit includes an attenuation subunit, a detection subunit and a unidirectional conduction subunit; the input end of the attenuation subunit serves as the input end of the enhanced trigger unit, the output end of the attenuation subunit is connected to the input end of the detection subunit, the output end of the detection subunit is connected to the input end of the unidirectional conduction subunit, and the output end of the unidirectional conduction subunit serves as the output end of the enhanced trigger unit; wherein:

[0020] The attenuation subunit is used to attenuate the detection signal according to the attenuation parameter to obtain an attenuated signal, and send the attenuated signal to the detection subunit;

[0021] The detection subunit is used to detect the attenuated signal to obtain a detection signal, and send the detection signal to the unidirectional conduction subunit;

[0022] The one-way conducting subunit is used to send the execution signal to the enhanced execution unit when the detection signal is greater than the conduction threshold.

[0023] Optionally, the unidirectional conducting subunit includes a diode and a first resistor, the anode of the diode serves as the input end of the unidirectional conducting subunit, the cathode of the diode is grounded through the first resistor, and the cathode of the diode serves as the output end of the unidirectional conducting subunit.

[0024] Optionally, the enhanced execution unit includes a processing subunit and an execution subunit; the input end of the processing subunit serves as the input end of the enhanced execution unit, the output end of the processing subunit is connected to the control end of the execution subunit, and the execution subunit is also connected to the fixed end of the first switch; wherein:

[0025] The processing subunit is used to determine the disconnected fixed end of the first switch when receiving the execution signal, and control the execution subunit to perform an isolation enhancement operation on the disconnected fixed end of the first switch.

[0026] Optionally, the execution subunit includes a second resistor and a plurality of second switches; wherein:

[0027] Each of the second switches is respectively connected between the first end of the second resistor and a fixed end of the first switch, and the second end of the second resistor is grounded; wherein the control end of the second switch serves as the control end of the execution subunit.

[0028] Optionally, the execution subunit further includes a third switch; wherein:

[0029] Each of the third switches is correspondingly connected between a fixed end of the first switch and the corresponding output line; the control end of the third switch serves as the control end of the execution subunit.

[0030] In addition, to achieve the above objective, the present invention further provides a radio frequency device, the radio frequency device comprising a switch circuit, and the switch circuit is configured as the switch circuit described above.

[0031] In addition, to achieve the above object, the present invention further provides an electronic device, wherein the electronic device comprises the switch circuit as described above.

[0032] The present invention proposes a switch circuit, a radio frequency device and an electronic device, wherein the switch circuit includes a first switch, a signal detection module and an isolation enhancement module; the first switch includes a plurality of fixed ends, each of which is connected to an output line, the detection end of the signal detection module is connected to the output line, the isolation enhancement module is connected to the fixed end of the first switch, and the output end of the signal detection module is connected to the input end of the isolation enhancement module; wherein: the signal detection module is used to generate a detection signal according to the signal output by the fixed end of the first switch when the fixed end in the first switch is closed, and send the detection signal to the isolation enhancement module; the isolation enhancement module is used to perform an isolation enhancement operation on the disconnected fixed end in the first switch when the detection signal meets the enhancement condition. By setting the signal detection module and the isolation enhancement module, when there is a signal output in the first switch, the state of the signal output by each fixed end is detected, so as to monitor the signal coupling situation, and when interference is detected, that is, when the enhancement condition is met, the isolation enhancement operation is performed, so as to improve the isolation between the fixed ends, reduce interference coupling, and avoid sensitivity degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0034] Figure 1 A functional module diagram of a switch circuit according to an embodiment of the present invention;

[0035] Figure 2 The switch circuit of the present invention is applied in Figure 1 Circuit structure diagram in the embodiment;

[0036] Figure 3 is a circuit structure diagram of another embodiment of the switch circuit of the present invention;

[0037] Figure 4 It is a structural diagram of a directional coupler;

[0038] Figure 5 is a circuit structure diagram of another embodiment of the switch circuit of the present invention;

[0039] Figure 6 FIG. 4 is a circuit structure diagram of another embodiment of the switch circuit of the present invention.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0041] Description of Figure Numbers:

[0042]

[0043] DETAILED DESCRIPTION

[0044] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The present invention provides a switch circuit, which is applied to a radio frequency device, see Figure 1 , Figure 1This is a functional module diagram of an embodiment of a switch circuit of the present invention. In this embodiment, the switch circuit includes a first switch 100, a signal detection module 200 and an isolation enhancement module 300; the first switch 100 includes a plurality of fixed ends, each of which is connected to an output line, the detection end of the signal detection module 200 is connected to the output line, the isolation enhancement module 300 is connected to the fixed end of the first switch 100, and the output end of the signal detection module 200 is connected to the input end of the isolation enhancement module 300; wherein:

[0049] The signal detection module 200 is used to generate a detection signal according to a signal output from the fixed end of the first switch 100 when the fixed end of the first switch 100 is closed, and send the detection signal to the isolation enhancement module 300;

[0050] The isolation enhancement module 300 is used to perform an isolation enhancement operation on the disconnected fixed end of the first switch 100 when the detection signal meets the enhancement condition.

[0051] In one embodiment, the first switch 100 is SPXT, and the first switch 100 includes a moving end and multiple fixed ends. A connecting knife is fixed on the moving end, and the conduction between the moving end and the fixed end is controlled by controlling the connection between the knife and the fixed end. When the first switch 100 is a single-pole multiple-throw, one moving end is connected to at most one fixed end at the same time. The specific number of fixed ends can be set based on actual application needs, such as setting the first switch 100 to SPDT (Single Pole Double Throw), SPTT (Single Pole Triple Throw), etc. It can be understood that when the first switch 100 is SPDT, the number of fixed ends of the first switch 100 is 2, and when the first switch 100 is SPTT, the number of fixed ends of the first switch 100 is 3.

[0052] The first switch 100 can be input through the moving end and output through the fixed end, or can be input through the fixed end and output through the moving end. This embodiment and subsequent embodiments are described by taking the moving end input and the fixed end output as an example. In a specific case, the moving end of the first switch 100 can be connected to the RF power amplifier, and the fixed end can be respectively connected to the RF channels in the LNABANK.

[0053] The signal is input from the moving end of the first switch 100, and after reaching the closed fixed end, it is output through the output line. The closed fixed end is the fixed end connected to the knife. It can be understood that each fixed end is connected to one output line respectively. When the closed fixed end outputs a signal, due to the poor isolation between the fixed ends, the signal of the closed fixed end will be coupled to the disconnected fixed end. At this time, the output line connected to the disconnected fixed end will output an interference signal due to signal coupling.

[0054] The results of signal detection on the output line are different when the disconnected fixed end outputs an interference signal or does not output an interference signal. Therefore, in this embodiment, a signal detection module 200 is provided to detect the signal output by the output line and generate a detection signal corresponding to the signal output condition of the output line.

[0055] The isolation enhancement module 300 determines the degree to which the unclosed fixed end in the first switch 100 is affected by the interference signal based on the detection signal, and then determines whether the enhancement conditions are met. The enhancement conditions can be set based on actual applications, such as the strength of the interference signal, or whether there is an interference signal, etc.; the enhancement condition is used as an example to illustrate whether there is an interference signal.

[0056] When the isolation enhancement module 300 determines that the detection signal meets the enhancement condition, it believes that there is an interference signal on the output line. Therefore, it performs an isolation enhancement operation on the disconnected fixed end, thereby improving the isolation between the fixed ends, eliminating or weakening the interference signal, and avoiding sensitivity degradation.

[0057] The specific method of isolation enhancement operation can be set based on the actual application scenario. The isolation enhancement operation is mainly reflected in the elimination of interference signals and the blocking of the output path of interference signals. For example, the isolation enhancement operation to eliminate interference signals can be to ground the fixed end. When the disconnected fixed end is grounded, if the fixed end is coupled to the interference signal, the interference signal will be transmitted to the ground, thereby avoiding output through the output line, thereby improving the isolation between the fixed ends. For example, the isolation enhancement operation to block the output path of the interference signal can be to control the fixed end to be disconnected from the corresponding output line. When the disconnected fixed end is disconnected from the output line, if the fixed end is coupled to the interference signal, the interference signal has no way to be transmitted to the output line, thereby avoiding the output of the interference signal, thereby achieving improved isolation. It should be noted that different isolation enhancement operations can be set separately or in combination.

[0058] In this embodiment, by setting a signal detection module 200 and an isolation enhancement module 300, when there is a signal output from the first switch 100, the state of the signal output from each fixed end is detected, thereby monitoring the signal coupling situation. When the enhancement conditions are met, the isolation enhancement operation is performed, thereby improving the isolation between the fixed ends, reducing interference coupling, and avoiding sensitivity degradation.

[0059] Further, see also Figure 2 It should be noted that Figure 2 In the example of two fixed ends, the case of more fixed ends can be handled by analogy, such as Figure 3 , Figure 3 The figure shows some components in the case of more fixed terminals; the signal detection module 200 includes a plurality of signal detection subunits 210, each of which is connected to one output line, and the signal detection subunit 210 is connected to the isolation enhancement module 300; wherein:

[0060] The signal detection subunit 210 is configured to generate a detection subsignal according to an output signal on the output line, wherein the detection signal is obtained based on the detection subsignal.

[0061] Furthermore, each of the signal detection subunits 210 is connected to an input terminal of the isolation enhancement module 300 respectively; wherein:

[0062] The signal detection subunit 210 is used to generate the detection sub-signal according to the output signal on the output line, and send the detection sub-signal to the isolation enhancement module 300 .

[0063] In this embodiment, each signal detection sub-unit 210 is respectively connected to the isolation enhancement module 300, so that the isolation enhancement module 300 performs an isolation enhancement operation on the corresponding fixed end according to the signal condition of each output line; at this time, the set of detection sub-signals received by the isolation enhancement module 300 is the detection signal; for example, the isolation enhancement module 300 determines whether each detection sub-signal satisfies the enhancement condition, and when the detection sub-signal satisfies the enhancement condition, the isolation enhancement operation is performed on the disconnected fixed end corresponding to the detection sub-signal.

[0064] Furthermore, each of the signal detection subunits 210 is cascaded in sequence and connected to the input end of the isolation enhancement module 300; wherein:

[0065] The signal detection subunit 210 is used to generate the detection sub-signal according to the output signal on the output line, wherein the detection sub-signals are superimposed to obtain the detection signal.

[0066] In this embodiment, each signal detection subunit 210 detects the signal condition of one output line respectively, and each signal detection subunit 210 generates a detection sub-signal representing the signal condition of the corresponding output line. The signal detection subunits 210 are cascaded with each other, that is, the output end of the first signal detection subunit 210 is connected to the input end of the second signal detection subunit 210, the output end of the second signal detection subunit 210 is connected to the input end of the third signal detection subunit 210, and so on, the output end of the last signal detection subunit 210 is connected to the input end of the isolation enhancement module 300. The detection sub-signals detected by multiple signal detection subunits 210 are superimposed in sequence to obtain a detection signal, and the detection signal is output to the isolation enhancement module 300.

[0067] In one embodiment, the signal detection subunit 210 is a directional coupler O1; wherein the input end and the through end of the directional coupler O1 are connected to the output line, wherein the input end of the directional coupler O1 is close to the fixed end, and the through end is far away from the fixed end;

[0068] The directional coupler O1 is cascaded through the coupling end and the isolation end of the directional coupler O1, wherein the coupling end of the directional coupler O1 is close to the isolation enhancement module 300, and the isolation end of the directional coupler O1 is far away from the isolation enhancement module 300; specifically, the coupling end of the previous directional coupler O1 is connected to the isolation end of the next directional coupler O1, and two consecutive directional couplers O1 are cascaded in pairs in this way until the coupling end of the last directional coupler O1 is connected to the isolation enhancement module.

[0069] The directional coupler O1 is composed of a through line and a coupled line. The through line and the coupled line are coupled to couple part of the power of the through line to the coupled line through a coupling mechanism, and the coupled power is output only from one end of the coupled line. The power output end corresponds to the signal input end of the through line. For details, see Figure 4 , the directional coupler O1 includes a through line and a coupled line, wherein the end of the through line connected to the fixed end is the input end, the end of the through line away from the fixed end is the through end, the end of the coupled line close to the isolation enhancement module 300 is the coupled end, and the end of the coupled line away from the isolation enhancement module 300 is the isolation end;

[0070] When there is a signal output at the fixed end, including the target signal and the interference signal, the signal is output from the input end to the through end. At the same time, the signal is coupled to the coupling line and output through the coupling end, and there is no signal output at the isolation end. The signal output from the coupling end is in a certain ratio to the signal input from the input end, and the specific ratio is based on the coupling degree of the directional coupler O1.

[0071] In the case of cascading directional couplers O1, the coupling end of the previous directional coupler O1 is connected to the isolation end of the next directional coupler O1, and the coupling end of the last directional coupler O1 is connected to the isolation enhancement module 300; it should be noted that in order to provide a signal transmission path, the isolation end of the first directional coupler O1, that is, the directional coupler O1 farthest from the isolation enhancement module 300, is grounded through a resistor. The signal output from the coupling end of the directional coupler O1 is transmitted to the isolation end of the next directional coupler O1, and after merging with the signal from the coupling end of the directional coupler O1, it continues to be transmitted downward until it is transmitted to the isolation enhancement module 300.

[0072] It should be noted that the directional coupler O1 has ultra-wideband characteristics, its general operating frequency range is 600MHz to 2800MHz, and it also has extremely low insertion loss. Therefore, setting the directional coupler O1 on the output line will not increase the insertion loss of the RF link, and can be applied to link designs in different frequency bands.

[0073] In other embodiments, see Figure 5 The directional coupler O1 can also be replaced by a feedback circuit. The specific type of the feedback circuit can be set based on actual needs, such as an electrical signal sensor. The specific setting of the feedback circuit can be analogous to the directional coupler O1 and will not be repeated here.

[0074] In one embodiment, the isolation enhancement module 300 includes an enhancement trigger unit 310 and an enhancement execution unit 320; wherein the input end of the enhancement trigger unit 310 serves as the input end of the isolation enhancement module 300, the output end of the enhancement trigger unit 310 is connected to the input end of the enhancement execution unit 320, and the enhancement execution unit 320 is connected to the fixed end of the first switch 100; wherein:

[0075] The enhancement trigger unit 310 is used to set the enhancement condition and send an execution signal to the enhancement execution unit 320 when the detection signal meets the enhancement condition;

[0076] The enhanced execution unit 320 is used to perform an isolation enhancement operation on the disconnected fixed end of the first switch 100 when receiving the execution signal.

[0077] The enhancement trigger unit 310 determines whether the enhancement condition is met, and the enhancement execution unit 320 specifically performs the isolation enhancement operation.

[0078] After receiving the detection signal, the enhancement trigger unit 310 determines whether the detection signal satisfies the enhancement condition. When the detection signal satisfies the enhancement condition, the enhancement execution unit 320 is controlled to perform the isolation enhancement operation. Specifically, when the detection signal satisfies the enhancement condition, an execution signal is generated and sent to the enhancement trigger unit 310. After receiving the execution signal, the enhancement trigger unit 310 performs the isolation enhancement operation on the disconnected stationary end.

[0079] Further, the enhanced trigger unit 310 includes an attenuation subunit 311, a detection subunit 312 and a unidirectional conduction subunit 313; the input end of the attenuation subunit 311 serves as the input end of the enhanced trigger unit 310, the output end of the attenuation subunit 311 is connected to the input end of the detection subunit 312, the output end of the detection subunit 312 is connected to the input end of the unidirectional conduction subunit 313, and the output end of the unidirectional conduction subunit 313 serves as the output end of the enhanced trigger unit 310; wherein:

[0080] The attenuation subunit 311 is used to attenuate the detection signal according to the attenuation parameter to obtain an attenuated signal, and send the attenuated signal to the detection subunit 312;

[0081] The detection subunit 312 is used to detect the attenuated signal to obtain a detection signal, and send the detection signal to the unidirectional conduction subunit 313;

[0082] The one-way conducting subunit 313 is used to send the execution signal to the enhanced execution unit 320 when the detection signal is greater than the conduction threshold.

[0083] It can be understood that when there is a signal output in the output line, it does not mean that an interference signal appears. When an interference signal appears, the detected signal will increase relative to when no interference signal appears. At the same time, taking into account the existence of circuit fluctuations and errors, in practical applications, the intensity of the detection signal that triggers the execution signal can be set higher than the ideal state where there is no interference signal; therefore, in this embodiment, the trigger threshold of the execution signal, that is, the conduction threshold, is set by the unidirectional conduction sub-unit 313, and the conduction threshold is fixed. When the detection signal received by the unidirectional conduction sub-unit 313 is greater than the conduction threshold, the unidirectional conduction sub-unit 313 triggers the execution signal to the enhanced execution unit 320.

[0084] First, if a high-power signal is directly output to subsequent testing and processing equipment, it will cause damage to the equipment. Therefore, the attenuation subunit 311 is set to attenuate the detection signal; further, it can be understood that the conduction threshold is fixedly set, therefore, when the attenuation strength of the detection signal by the attenuation subunit 311 increases, under the same conduction threshold, the corresponding detection signal that can trigger the execution signal needs to be increased, conversely, when the attenuation strength of the detection signal by the attenuation subunit 311 decreases, under the same conduction threshold, the corresponding detection signal that can trigger the execution signal will decrease; therefore, by controlling the attenuation strength of the attenuation subunit 311, it is possible to control the trigger value of the detection signal, that is, to achieve the setting of the enhancement condition.

[0085] After attenuating the detection signal, the attenuation subunit 311 obtains an attenuated signal and sends the attenuated signal to the detection subunit 312. The detection subunit 312 converts the modulated wave or current into the original modulated wave or current. After the attenuated signal passes through the detection subunit 312, the detection subunit 312 demodulates the attenuated signal to obtain a specific voltage signal, and outputs the voltage signal to the unidirectional conduction subunit 313.

[0086] It should be noted that the attenuation subunit 311 can be implemented by selecting a suitable attenuation circuit based on actual needs. The general attenuation network can be composed of a series of resistor devices with different resistance values. The attenuation degree of the network is determined according to the selectable resistance value, so as to roughly calculate the size of the signal after passing through the attenuation network. The detection subunit 312 can be implemented by selecting a suitable detection circuit based on actual needs. The most common demodulation methods are rectification detection and phase-sensitive detection. If the modulated signal is biased and a DC component is superimposed so that the biased signal has a positive voltage, then the envelope of the amplitude modulated wave will have the shape of the original modulated signal. The amplitude modulated wave can be simply half-wave or full-wave rectified and filtered, and the applied bias voltage can be subtracted to restore the original modulated signal. This method is also called envelope analysis. The detection circuit here is mainly used to extract the amplitude information of the feedback signal.

[0087] Furthermore, the unidirectional conducting subunit 313 includes a diode D1 and a first resistor R1, the anode of the diode D1 serves as the input end of the unidirectional conducting subunit 313, the cathode of the diode D1 is grounded through the first resistor R1, and the cathode of the diode D1 serves as the output end of the unidirectional conducting subunit 313.

[0088] The cathode of the diode D1 is grounded through the first resistor R1, and the cathode of the diode D1 is fixed at zero potential; and the on-voltage of the diode D1 is fixed, therefore, when the signal input to the anode of the diode D1 is greater than the on-voltage of the diode D1, the diode D1 is turned on, therefore, the on-voltage of the diode D1 is the on-threshold.

[0089] When the voltage value of the detection signal obtained by the attenuation subunit 311 and the detection subunit 312 is greater than the conduction voltage of the diode D1, the diode D1 is turned on, at this time, the cathode potential of the diode D1 increases, the enhanced execution unit 320 receives a high-level signal, and the execution signal is triggered; when the voltage value of the detection signal is less than or equal to the conduction voltage of the diode D1, the diode D1 is cut off, the cathode potential of the diode D1 remains at zero potential, and the enhanced execution unit 320 receives a low-level signal. Therefore, by setting the diode D1, the triggering of the execution signal can be realized.

[0090] In other embodiments, the diode D1 may be replaced by a radio frequency isolator. The radio frequency isolator, also called a unidirectional device, is a two-port device with a unidirectional transmission characteristic to prevent excessive reflected signals from affecting the previous stage.

[0091] Furthermore, the enhanced execution unit 320 includes a processing subunit (not shown) and an execution subunit (not labeled); the input end of the processing subunit serves as the input end of the enhanced execution unit 320, the output end of the processing subunit is connected to the control end of the execution subunit, and the execution subunit is also connected to the fixed end of the first switch 100; wherein:

[0092] The processing subunit is used to determine the disconnected fixed end of the first switch 100 when receiving the execution signal, and control the execution subunit to perform an isolation enhancement operation on the disconnected fixed end of the first switch 100.

[0093] The processing subunit may be a processing device in a radio frequency device, or may be a processing device specially provided for a switch circuit.

[0094] The processing sub-unit controls the execution sub-unit to perform the isolation enhancement operation according to the execution signal; when the processing sub-unit receives the execution signal, it can clearly know that the isolation enhancement operation needs to be performed at this time, and when the signal detection unit is a cascade of multiple directional couplers O1, the processing sub-unit cannot determine the fixed end that needs to be isolated and enhanced according to the execution signal; therefore, in the application process, the processing sub-unit will obtain the state information of the first switch 100, and after receiving the execution signal, it will determine the disconnected fixed end according to the state information of the first switch 100, thereby determining the fixed end that needs to be isolated and enhanced; such as in Figure 2In the embodiment, when the fixed end A of the first switch 100 is closed and the fixed end B is disconnected, the processing subunit can determine that the disconnected fixed end is the fixed end B according to the state of the first switch 100, so the control execution subunit performs the isolation enhancement operation on the fixed end B. The specific method for obtaining the state information of the first switch 100 can be set based on the actual application scenario.

[0095] Furthermore, the execution subunit includes a second resistor R2 and a plurality of second switches K2; wherein:

[0096] Each second switch K2 is respectively connected between the first end of the second resistor R2 and a fixed end of the first switch 100, and the second end of the second resistor R2 is grounded; wherein the control end of the second switch K2 serves as the control end of the execution subunit.

[0097] The execution subunit in this embodiment realizes the improvement of isolation between the fixed ends by grounding; it can be understood that when the second switch K2 is closed, the corresponding fixed end is grounded through the second resistor R2. At this time, the interference signal on the fixed end and the corresponding output line will be released to the ground through the second resistor R2, thereby preventing the interference signal from being output through the output line, thereby improving the isolation between the fixed ends. When one fixed end of the first switch 100 is closed, if the isolation enhancement operation is performed, the disconnected fixed end in the first switch 100 is closed through the second switch K2, so that the disconnected fixed end is grounded through the second resistor R2.

[0098] The first ends of all the second switches K2 are short-circuited and grounded through the second resistor R2, and the second ends of each second switch K2 correspond to a fixed end.

[0099] In other embodiments, a plurality of second resistors R2 may be provided, and the second switch K2, the second resistor R2, and the fixed end are provided in a one-to-one correspondence.

[0100] In order to reduce the cost and space occupied by the switch circuit, in this embodiment, the first resistor R1 and the second resistor R2 are set as one resistor, thereby reducing the use of one resistor. In other embodiments, the first resistor R1 and the second resistor R2 can also be set separately, such as setting the cathode of the diode D1 to ground through the first resistor R1, and setting the second end of the second switch K2 to ground through the second resistor R2.

[0101] It should be noted that the specific type of the second switch K2 can be set based on needs, such as Figure 2 In the case where the number of fixed ends is 2, an SDPT can be set to implement the switching of grounding between the two fixed ends through the SDPT.

[0102] In one embodiment, the execution subunit further includes a third switch K3; wherein:

[0103] Each of the third switches K3 is connected between a fixed end of the first switch 100 and the corresponding output line; the control end of the third switch K3 serves as the control end of the execution subunit.

[0104] In this embodiment, in order to further improve the isolation between the fixed terminals, a third switch K3 is provided; the third switch K3 is provided for a single fixed terminal and a corresponding output line, and when an isolation enhancement operation is required, the third switch K3 is controlled to be disconnected, and at this time, the fixed terminal and the corresponding output line are disconnected by the third switch K3, and the interference signal coupled by the fixed terminal cannot be output through the output line, thereby achieving further isolation between the fixed terminals. Specifically, when one fixed terminal of the first switch 100 is closed, if an isolation enhancement operation is performed, the disconnected fixed terminal in the first switch 100 is closed by the third switch K3, so that the disconnected fixed terminal is disconnected from the corresponding output line.

[0105] It should be noted that the third switch K3 improves the isolation by disconnecting the fixed end from the output line, and the second switch K2 improves the isolation by grounding the fixed end; the third switch K3 and the second switch K2 are two parallel solutions, and in practical applications, they can be as follows: Figure 2 As shown in the figure, the third switch K3 and the second switch K2 are used to improve the isolation of the fixed end; the isolation can also be improved by selecting one of the third switch K3 and the second switch K2, see Figure 6 , Figure 6 FIG. 4 shows a method of improving the isolation by only using the third switch K3 .

[0106] The following is based on Figure 2 , the overall implementation of the switch circuit of the present invention is described:

[0107] Take the case where the number of fixed ends of the first switch 100 is 2 as an example;

[0108] When the fixed terminal A is closed to output the target signal, the third switch K3 corresponding to the fixed terminal A is controlled to be closed, and a detection signal is generated based on the signal output on the output line through the directional coupler O1. When the isolation enhancement is triggered, the second switch K2 is controlled to close the fixed terminal B. At this time, the fixed terminal B is grounded through the second resistor R2. Even if a signal from the fixed terminal A is coupled to the fixed terminal B, it will be transmitted to the ground, thereby improving the isolation. At the same time, the third switch K3 corresponding to the fixed terminal B is disconnected to further prevent the signal coupled to the fixed terminal B from being output through the output line.

[0109] The present invention also protects a radio frequency device, which includes a switch circuit. The structure of the switch circuit can refer to the above embodiment and will not be described in detail here. As a matter of course, since the radio frequency device of this embodiment adopts the technical solution of the switch circuit, the radio frequency device has all the beneficial effects of the switch circuit.

[0110] The present invention also protects an electronic device, which includes a switch circuit. The structure of the switch circuit can refer to the above embodiment and will not be described in detail here. As a matter of course, since the electronic device of this embodiment adopts the technical solution of the switch circuit, the electronic device has all the beneficial effects of the switch circuit.

[0111] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "includes a..." does not exclude the presence of other identical elements in the process, method, article or system including the element. The serial numbers of the above-mentioned embodiments of the present invention are for description only and do not represent the advantages and disadvantages of the embodiments.

[0112] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A switching circuit, It is characterized in that The switch circuit includes a first switch, a signal detection module and an isolation enhancement module; the first switch includes a plurality of fixed ends, each of which is connected to an output line, the detection end of the signal detection module is connected to the output line, the isolation enhancement module is connected to the fixed end of the first switch, and the output end of the signal detection module is connected to the input end of the isolation enhancement module; wherein: The signal detection module is used to generate a detection signal according to a signal output by the fixed end of the first switch when the fixed end of the first switch is closed, and send the detection signal to the isolation enhancement module; The isolation enhancement module is used to perform an isolation enhancement operation on the disconnected fixed end of the first switch when the detection signal meets the enhancement condition.

2. The switching circuit according to claim 1, It is characterized in that The signal detection module includes a plurality of signal detection subunits, each of which is connected to one of the output lines, and the signal detection subunit is connected to the isolation enhancement module; wherein: The signal detection subunit is used to generate a detection sub-signal according to an output signal on the output line, wherein the detection signal is obtained based on the detection sub-signal.

3. The switching circuit according to claim 2, It is characterized in that Each of the signal detection subunits is connected to an input terminal of the isolation enhancement module respectively; wherein: The signal detection subunit is used to generate the detection sub-signal according to the output signal on the output line, and send the detection sub-signal to the isolation enhancement module.

4. The switching circuit according to claim 2, It is characterized in that Each of the signal detection subunits is cascaded in sequence and connected to the input end of the isolation enhancement module; wherein: The signal detection subunit is used to generate the detection sub-signal according to the output signal on the output line, wherein the detection sub-signals are superimposed to obtain the detection signal.

5. The switch circuit according to claim 4, It is characterized in that The signal detection subunit is a directional coupler; wherein the input end and the through end of the directional coupler are connected to the output line, wherein the input end of the directional coupler is close to the fixed end, and the through end is far away from the fixed end; The directional coupler is cascaded through a coupling end and an isolation end of the directional coupler, wherein the coupling end of the directional coupler is close to the isolation enhancement module, and the isolation end of the directional coupler is far away from the isolation enhancement module.

6. The switch circuit according to claim 1, It is characterized in that The isolation enhancement module includes an enhancement trigger unit and an enhancement execution unit; wherein the input end of the enhancement trigger unit serves as the input end of the isolation enhancement module, the output end of the enhancement trigger unit is connected to the input end of the enhancement execution unit, and the enhancement execution unit is connected to the fixed end of the first switch; wherein: The enhancement trigger unit is used to set the enhancement condition and send an execution signal to the enhancement execution unit when the detection signal meets the enhancement condition; The enhanced execution unit is used to perform an isolation enhancement operation on the disconnected fixed end of the first switch when receiving the execution signal.

7. The switch circuit according to claim 6, It is characterized in that The enhanced trigger unit includes an attenuation subunit, a detection subunit and a unidirectional conduction subunit; the input end of the attenuation subunit serves as the input end of the enhanced trigger unit, the output end of the attenuation subunit is connected to the input end of the detection subunit, the output end of the detection subunit is connected to the input end of the unidirectional conduction subunit, and the output end of the unidirectional conduction subunit serves as the output end of the enhanced trigger unit; wherein: The attenuation subunit is used to attenuate the detection signal according to the attenuation parameter to obtain an attenuated signal, and send the attenuated signal to the detection subunit; The detection subunit is used to detect the attenuated signal to obtain a detection signal, and send the detection signal to the unidirectional conduction subunit; The one-way conducting subunit is used to send the execution signal to the enhanced execution unit when the detection signal is greater than the conduction threshold.

8. The switch circuit according to claim 7, It is characterized in that The one-way conducting subunit includes a diode and a first resistor, wherein the anode of the diode serves as the input end of the one-way conducting subunit, the cathode of the diode is grounded through the first resistor, and the cathode of the diode serves as the output end of the one-way conducting subunit.

9. The switch circuit according to claim 6, It is characterized in that The enhanced execution unit includes a processing subunit and an execution subunit; the input end of the processing subunit serves as the input end of the enhanced execution unit, the output end of the processing subunit is connected to the control end of the execution subunit, and the execution subunit is also connected to the fixed end of the first switch; wherein: The processing subunit is used to determine the disconnected fixed end of the first switch when receiving the execution signal, and control the execution subunit to perform an isolation enhancement operation on the disconnected fixed end of the first switch.

10. The switch circuit according to claim 9, It is characterized in that The execution subunit includes a second resistor and a plurality of second switches; wherein: Each of the second switches is respectively connected between the first end of the second resistor and a fixed end of the first switch, and the second end of the second resistor is grounded; wherein the control end of the second switch serves as the control end of the execution subunit.

11. The switch circuit according to claim 10, It is characterized in that The execution subunit further includes a third switch; wherein: Each of the third switches is correspondingly connected between a fixed end of the first switch and the corresponding output line; the control end of the third switch serves as the control end of the execution subunit.

12. A radio frequency device, It is characterized in that The radio frequency device comprises the switch circuit according to any one of claims 1 to 11.

13. An electronic device, It is characterized in that The electronic device comprises the switch circuit according to any one of claims 1 to 11.

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