CN114928373A

CN114928373A - Circuit for improving port isolation, radio frequency electronic switch and terminal

Info

Publication number: CN114928373A
Application number: CN202210316418.8A
Authority: CN
Inventors: 葛谋; 吴斌
Original assignee: Xi'an Aowei Hanhai Electronic Technology Co Ltd
Current assignee: Xi'an Lingchuang Electronic Technology Co ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-08-19
Anticipated expiration: 2042-03-28
Also published as: CN114928373B

Abstract

A circuit, a radio frequency electronic switch and a terminal for improving port isolation degree are provided, the circuit comprises: the signal transmission circuit comprises an input end, a first output end and a second output end, wherein a first diode and a second capacitor are sequentially connected between the input end and the first output end in series, a second diode and a fifth capacitor are sequentially connected between the input end and the second output end in series, and a first capacitor is connected between the common node of the first diode and the second diode and the input end; the isolation circuit comprises a first blocking module, a second blocking module and a load absorption structure, wherein the first blocking module and the second blocking module are provided with a first common node, one end of the load absorption structure is connected to the first common node, and the other end of the load absorption structure is grounded. This is disclosed, and the effect of the isolation circuit that forms through the common combination of first separation module, second separation module and load absorbing structure has improved the isolation between each port in the radio frequency electronic switch, has avoided the electromagnetic compatibility problem because of port isolation is lower and arouse.

Description

Circuit for improving port isolation, radio frequency electronic switch and terminal

Technical Field

The present disclosure relates to the field of radio frequency circuit technologies, and in particular, to a circuit, a radio frequency electronic switch, and a terminal for providing port isolation.

Background

With the development of domestic and foreign technologies, the functions of communication electronic products become more and more powerful, and from the initial simple digital signal simulation to the development of multi-band, high-speed frequency modulation and networking, electronic devices are also rapidly developed, so that the traditional transceiving conversion switch cannot meet the increasing requirements of users.

Because the isolation degree of traditional switching devices such as a transmit-receive transfer switch, a relay and the like is low, the problem of poor electromagnetic compatibility can be caused because the isolation degree of a port is low, and the design requirement of a system can not be met, and therefore a radio frequency electronic switch with high isolation degree is urgently needed.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure is directed to overcome the above-mentioned deficiencies in the prior art, and to provide a circuit rf electronic switch and a terminal with improved port isolation.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.

According to an aspect of the present disclosure, there is provided a circuit for improving port isolation, including:

the signal transmission circuit comprises an input end, a first output end and a second output end, wherein a first diode and a second capacitor are sequentially connected between the input end and the first output end in series, a second diode and a fifth capacitor are sequentially connected between the input end and the second output end in series, and a first capacitor is connected between a common node of the first diode and the second diode and the input end;

the isolation circuit comprises a first isolation module, a second isolation module and a load absorption structure, wherein the first isolation module and the second isolation module are provided with a first common node, one end of the load absorption structure is connected to the first common node, and the other end of the load absorption structure is grounded;

one end of the first blocking module is connected between the first diode and the second capacitor, and the second blocking module is connected between the second diode and the fifth capacitor.

In some embodiments of the present disclosure, based on the foregoing scheme, the first blocking module includes a third diode, a fifth diode and a third capacitor connected in series in sequence.

In some embodiments of the present disclosure, based on the foregoing scheme, the third diode and the fifth diode have a second common node, and the first diode is connected to the second common node.

In some embodiments of the present disclosure, based on the foregoing scheme, the circuit further includes a seventh diode, one end of the seventh diode is connected to a third common node, the other end of the seventh diode is grounded, and the third common node is a common node that the second capacitor and the third diode have.

In some embodiments of the present disclosure, based on the foregoing scheme, the second blocking module includes a fourth diode, a sixth diode and a fourth capacitor connected in series in sequence.

In some embodiments of the present disclosure, based on the foregoing scheme, the fourth diode and the sixth diode have a fourth common node, and the second diode is connected to the fourth common node.

In some embodiments of the present disclosure, based on the foregoing scheme, the circuit further includes an eighth diode, one end of the eighth diode is connected to the fifth common node, the other end of the eighth diode is grounded, and the fifth common node is a common node that the fifth capacitor and the fourth diode have.

In some embodiments of the present disclosure, based on the foregoing scheme, the load absorbing structure is a load absorbing resistor.

According to another aspect of the present disclosure, there is provided a radio frequency electronic switch comprising:

the radio frequency electronic switch comprises a radio frequency electronic switch body, a signal transmission circuit and a control circuit, wherein the radio frequency electronic switch body comprises the signal transmission circuit which is provided with an input end and a plurality of output ends;

and the isolation circuit is connected in the signal transmission circuit and used for improving the port isolation degree between the input end and the plurality of output ends or among the plurality of output ends.

According to another aspect of the present disclosure, a terminal is provided, where the terminal includes at least a processor, a memory, a radio frequency circuit, and the radio frequency electronic switch, where the memory and the radio frequency circuit are connected to the processor, the radio frequency electronic switch is connected to the radio frequency circuit, the processor is configured to process a signal, the memory is configured to store the signal, the radio frequency circuit is configured to receive and transmit the signal, and the radio frequency electronic switch is configured to control on/off of the signal in the radio frequency circuit.

According to the circuit for improving the port isolation, on one hand, the isolation circuit is arranged in the signal transmission circuit, and the first isolation module and the second isolation module in the isolation circuit are used for isolating leakage signals among output ports in the signal transmission circuit respectively, so that the isolation among the output ports is improved; on the other hand, the isolation circuit also comprises a load absorption structure connected with the first barrier module and the second barrier module, and the load absorption structure absorbs incompletely isolated leakage signals in the first barrier module and the second barrier module, so that the isolation degree between the ports is further improved; according to the radio frequency electronic switch, the input end and the output end of the radio frequency electronic switch and the isolation degree among the output ends are improved through the combined action of the isolation module and the load absorption structure, the problem of electromagnetic compatibility caused by low port isolation degree is solved, and the performance of the device is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure. It should be apparent that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived by those of ordinary skill in the art without inventive effort.

Fig. 1 is a schematic structural diagram of a series architecture rf electronic switch in an exemplary embodiment of the disclosure.

Fig. 2 is a schematic structural diagram of a parallel architecture rf electronic switch in an exemplary embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a series-parallel architecture rf electronic switch in an exemplary embodiment of the disclosure.

Fig. 4 is a schematic structural diagram of a circuit for improving port isolation in an exemplary embodiment of the present disclosure.

Fig. 5 is an equivalent circuit diagram of a first signal transmission circuit in an exemplary embodiment of the present disclosure.

Fig. 6 is an equivalent circuit diagram of a second signal transmission circuit in an exemplary embodiment of the disclosure.

Fig. 7 is a schematic structural diagram of a radio frequency electronic switch with an isolation circuit in an exemplary embodiment of the present disclosure.

Fig. 8 is a schematic structural diagram of a terminal in an exemplary embodiment of the present disclosure.

Wherein the reference numerals are as follows:

100: a radio frequency electronic switch body; 101: a signal transmission circuit; 102: an isolation circuit;

10: an input end; 20: output end: 21: a first output terminal; 22: a second output terminal;

1: a first barrier module; 2: a second barrier module; 3: a load-absorbing structure;

d1: a first diode; d2: a second diode; d3: a third diode;

d4: a fourth diode; d5: a fifth diode; d6: a sixth diode;

d7: a seventh diode; d8: an eighth diode; c1: a first capacitor;

c2: a second capacitor; c3: a third capacitor; c4: a fourth capacitor;

c5: a fifth capacitor; 31: a first common node; 32: a second common node;

33: a third common node; 34: a fourth common node; 35: a fifth common node.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.

The diode used in the present disclosure may be a general diode composed of a PN junction, or may be a PIN diode or a diode having another structure, and preferably, is a PIN diode. The PIN Diode is formed by adding a thin layer of low-doped Intrinsic (Intrinsic) semiconductor layer between a P-type semiconductor material and an N-type semiconductor material, is widely applied due to the existence of the Intrinsic (Intrinsic) layer, is mainly applied to the field of Radio Frequency (RF), is used as an RF switch and an RF protection circuit, and is also used as a photodiode (Photo Diode), wherein the PIN Diode comprises a PIN photodiode and a PIN switch Diode, and the PIN diodes are both suitable for the circuit provided by the disclosure.

Because the PIN diode presents approximate on-off impedance characteristic under direct current forward-reverse bias, the conversion function of a control radio frequency signal channel is realized, and the total charge of the I layer of the PIN diode is mainly generated by bias current. Instead of radio frequency current instantaneous value, it only presents a linear resistor to microwave signal, the resistance value is determined by DC bias, the resistance value is small when forward bias is close to short circuit, and the resistance value is large when reverse bias is close to open circuit. Thus, a PIN diode can be used as a variable impedance element in a radio frequency electronic switch.

Common architectures of the rf electronic switch are a series architecture, a parallel architecture and a series-parallel combination architecture, and the specific structure thereof is shown in fig. 1, fig. 2 and fig. 3, wherein, fig. 1 is a schematic diagram of a serial architecture of an rf electronic switch, an input terminal of the rf electronic switch is respectively connected to two output ports, a PIN diode is connected in series between the input terminal 10 and the first output terminal 21, after the bias voltage is applied to the input terminal 10, the PIN diode is in a conducting state, so that the input terminal 10 and the first output terminal 21 are in a communicating state, and similarly, the input terminal 10 and the second output terminal 22 have the same structure, when the PIN diode is in a reverse cut-off high-impedance state after the switch is disconnected, because the PIN diode has a reflection effect on a radio frequency signal in the radio frequency circuit, there is a leakage of the rf signal in the circuit, which results in a low isolation between the first output terminal 21 and the second output terminal 22.

In the schematic diagram of the parallel architecture of the radio frequency electronic switch shown in fig. 2, no PIN diode is connected between the input terminal 10 and the first and

second output terminals

21 and 22, so that after a bias voltage is applied to the input terminal 10, the input terminal and the output terminal are directly connected, and after the switch is turned off, when a reflection leakage signal exists between the two output terminals, the reflection leakage signal is transmitted to a ground state through the PIN diode connected in parallel in the circuit, so that the reflection signal is absorbed, but the isolation between the two output terminals achieved by the parallel architecture is not high.

In the series-parallel connection structure of the rf electronic switch as shown in fig. 3, the isolation between the two output ports is improved by combining the series connection structure and the parallel connection structure, but the isolation between the two output ports is not ideal.

Therefore, the present disclosure provides a circuit for improving port isolation, which can improve the port isolation of a radio frequency electronic switch through a new circuit architecture, and provides a radio frequency electronic switch with high port isolation.

The disclosed embodiment provides a circuit for improving port isolation, as shown in fig. 4, the circuit includes: signal transmission circuit and isolation circuit.

The signal transmission circuit comprises an input end 10, a first output end 21 and a second output end 22, a first diode D1 and a second capacitor C2 are sequentially connected between the input end 10 and the first output end 21 in series, a second diode D2 and a fifth capacitor C5 are sequentially connected between the input end 10 and the second output end 22 in series, and a first capacitor C1 is connected between a common node of the first diode D1 and the second diode D2 and the input end 10.

The first capacitor C1, the second capacitor C2, and the fifth capacitor C5 are rf path coupling capacitors, which provide an rf path and isolate different dc bias voltages, in some embodiments, the first capacitor C1, the second capacitor C2, and the fifth capacitor C5 may be rf path dc blocking patch capacitors, which can withstand pass power and high voltage, the specific types of the three capacitors may be specifically selected according to an operating frequency band of the rf electronic switch, the lower the operating frequency band of the rf electronic switch, the larger the capacitance value is required, and generally, as the rf path coupling capacitors, the first capacitor C1, the second capacitor C2, and the fifth capacitor C5 may be capacitors with parameters of package 1812, withstand voltage 300V, and capacity of 0.01 μ F, but the capacitors of the above types are merely exemplary references, and may be specifically selected according to specific capacitor usage requirements, the present disclosure is not particularly limited.

The isolation circuit is shown in a large rectangular dotted area in fig. 4, and includes a first blocking module 1 (a small rectangular dotted area), a second blocking module 2 (a small rectangular dotted area), and a load absorbing structure 3, where the first blocking module 1 and the second blocking module 2 have a first common node 31, one end of the load absorbing structure 3 is connected to the first common node 31, and the other end of the load absorbing structure 3 is Grounded (GND).

One end of the first blocking module 1 is connected between the first diode D1 and the second capacitor C2, and the second blocking module 2 is connected between the second diode D2 and the fifth capacitor C5.

In some embodiments, the first blocking module 1 includes a third diode D3, a fifth diode D5 and a third capacitor C3 connected in series, the third diode D3 and the fifth diode D5 have a second common node 32, the first diode D1 is connected to the second common node 32, the first blocking module 1 can be connected between the input terminal 10 and the first output terminal 21 through the connection relationship between the first blocking module 1 and the signal transmission circuit, the circuit between the input terminal 10 and the first output terminal 21 is referred to as a first signal transmission circuit in the present disclosure, and the first blocking module 1 can isolate a leakage signal in the first signal transmission circuit to improve the isolation of the first signal transmission circuit.

In some embodiments, the second blocking module 2 includes a fourth diode D4, a sixth diode D6 and a fourth capacitor C4 connected in series in sequence, the fourth diode D4 and the sixth diode D6 have a fourth common node 34, the second diode D2 is connected to the fourth common node 34, the second blocking module 2 can be connected between the input terminal 10 and the second output terminal 22 through the connection relationship between the second blocking module 2 and the signal transmission circuit, the circuit between the input terminal 10 and the second output terminal 22 is referred to as a second signal transmission circuit in the present disclosure, and the second blocking module 2 can isolate a leakage signal in the second signal transmission circuit to improve the isolation of the second signal transmission circuit.

In some embodiments, since the isolation circuit further includes a load absorption structure 3, the first blocking module 1 and the second blocking module 2 have a first common node 31, one end of the load absorption structure 3 is connected to the first common node 31, and the other end of the load absorption structure 3 is Grounded (GND), where the first common node 31 is a common node that the third capacitor C3 in the first blocking module 1 and the fourth capacitor C4 in the second blocking module 2 have, that is, the load absorption structure 3 is connected to a common node that the third capacitor C3 and the fourth capacitor C4 have, after the first blocking module 1 isolates the leakage signal from the first signal transmission circuit, if the leakage signal still exists, the leakage signal can be absorbed by the load absorption structure 3, so as to further improve the port isolation degree in the circuit; similarly, after the second blocking module 2 isolates the leakage signal of the first signal transmission circuit, if the leakage signal still exists, the leakage signal can be absorbed through the load absorption structure 3, and the port isolation in the circuit is further improved.

The third capacitor C3 and the fourth capacitor C4 may be filter capacitors that filter dc bias voltage and eliminate interference influence of signals, and the third capacitor C3 and the fourth capacitor C4 may be packaged as 1210, 1206, or 0805 capacitors with withstand voltage of 300V and capacity of 0.001 μ F, but capacitors of other types or structures may also be selected according to the capacitor usage of an actual circuit, which is not limited in this disclosure.

It should be noted that, in the embodiment of the present disclosure, the load absorbing structure 3 may be a load absorbing resistor, the number of the load absorbing resistors may be one or more, or may be a combination of the load absorbing resistor and other devices, for example, the load absorbing structure is formed by combining the load absorbing resistor and an inductor, or the load absorbing structure is formed by combining the load absorbing resistor and a capacitor, the present disclosure does not limit the specific structure of the load absorbing structure 3, and the effect of absorbing the leakage signal needs to be satisfied.

In addition, if the load absorption structure adopts a structure of load absorption resistors, and if the number of the load absorption resistors is multiple, the load absorption resistors can be connected in the isolation circuit in a series or parallel mode, further, the load absorption resistors can adopt load resistors with the resistance value of 50 ohms, and load resistors with other resistance values or types can be selected according to specific use requirements.

In some embodiments, the signal transmission circuit further includes a seventh diode D7 and an eighth diode D8, one end of the seventh diode D7 is connected to the third common node 33, the other end of the seventh diode D7 is connected to ground (DND), the third common node 33 is a common node between the second capacitor C2 and the third diode D3, one end of the eighth diode D8 is connected to the fifth common node 35, the other end of the eighth diode is connected to Ground (GND), and the fifth common node 35 is a common node between the fifth capacitor C5 and the fourth diode D4. Wherein, the seventh diode D7 and the eighth diode D8 are arranged in the signal transmission circuit, and one end of each is connected to ground, so as to conduct the leakage signals generated by different ports to ground through the seventh diode D7 and the eighth diode D8, thereby improving the isolation between the ports.

The working process of the signal transmission circuit and the isolation circuit is explained with reference to fig. 4:

1. when a radio frequency signal is transmitted from the input terminal 10 to the first output terminal 21, the signal transmission path is as shown by the arrow direction in fig. 5, and the on and off states of the respective diodes shown in fig. 4 are as shown in table 1:

D1

D2

D3

D4

D5

D6

D7

D8

is conducted to

√

Cut-off

√

TABLE 1

With reference to table 1, fig. 4 and fig. 5, when the input terminal 10 is required to output a radio frequency signal to the first output terminal 21, the input terminal 10 and the first output terminal 21 are in a conducting state, and the input terminal 10 and the second output terminal 22 are in a blocking state, at this time, the conducting and blocking relationships of each component in the signal transmission circuit and the isolation circuit are as follows:

the first diode D1, the third diode D3, the sixth diode D6 and the eighth diode D8 are forward-turned on, the second diode D2, the fourth diode D4, the fifth diode D5 and the seventh diode D7 are reverse-turned off, a radio frequency signal is input from the input terminal 10, and is transmitted to the first output terminal 21 via the first capacitor C1, the first diode D1, the third diode D3 and the second capacitor C2, wherein since the second diode D2 connecting between the input terminal 10 and the second output terminal 22 is in a high-impedance state and is in a high-impedance state due to characteristics of the diodes, a part of a leakage signal may exist, and in the second signal transmission circuit, the fourth diode D4 is also in a turned-off state, a leakage blocking signal may be further performed, and further, since the eighth diode D8 is in a turned-on state, a signal leaked from the fourth diode D4 may be turned on via the eighth diode D8 and grounded; in the isolation circuit, the leakage signal output through the second diode D2 can be transmitted to the load absorbing structure 3 through the sixth diode D6 and the fourth capacitor C4, and then the leakage signal is absorbed by the load absorbing structure 3 and then grounded.

2. When a radio frequency signal is transmitted from the input terminal 10 to the second output terminal 22, the signal transmission path is as shown by the arrow direction in fig. 6, and the on and off states of the respective diodes shown in fig. 4 are as shown in table 2:

D1

D2

D3

D4

D5

D6

D7

D8

cut-off

√

Conduction of

√

TABLE 2

With reference to table 2, fig. 4 and fig. 6, when the input terminal 10 is required to output a radio frequency signal to the second output terminal 22, the input terminal 10 and the second output terminal 22 are in a conducting state, and the input terminal 10 and the first output terminal 21 are in a blocking state, at this time, the conducting and blocking relations of each component in the signal transmission circuit and the isolation circuit are as follows:

the first diode D1, the third diode D3, the sixth diode D6 and the eighth diode D8 are turned off in the reverse direction, the second diode D2, the fourth diode D4, the fifth diode D5 and the seventh diode D7 are turned on in the forward direction, a radio frequency signal is input from the input terminal 10 and is transmitted to the second output terminal 22 via the first capacitor C1, the second diode D2, the fourth diode D4 and the fifth capacitor 5, wherein since the first diode D1 connected between the input terminal 10 and the first output terminal 21 is in a high-impedance off state but a part of a leakage signal may exist due to the characteristics of the diodes, in the first signal transmission circuit, the third diode D3 is also in an off state and the leakage signal may be further intercepted, and further, since the seventh diode D7 is in an on state, a signal leaked from the third diode D3 may be turned on via the seventh diode D7 and grounded; in the isolation circuit, the leakage signal outputted from the first diode D1 can be transmitted to the load absorbing structure 3 through the fifth diode D5 and the third capacitor C3, and then the leakage signal is grounded after being absorbed by the load absorbing structure 3, so that the port isolation between the second output terminal 22 and the first output terminal 21 can be effectively improved through the signal propagation path.

In some embodiments of the present disclosure, for the radio frequency electronic switch in which one input end corresponds to two output ends as shown in fig. 3, a port isolation end is usually within a range of 0-30 dB, and a maximum isolation value is also within 50dB, but in the radio frequency electronic switch provided in the present disclosure, an isolation circuit is additionally provided in a signal transmission circuit, so that the port isolation degree can reach more than 80dB, compared with the existing radio frequency electronic switch, the port isolation degree of the present disclosure is improved by more than 60% compared with the existing port isolation degree, the effect of improving the port isolation degree is significant, and the performance of a device is greatly optimized.

It should be noted that, in the above embodiments of the present disclosure, the signal transmission circuit has one input end and two output ends as an example to describe the isolation circuit and the load absorption structure, but the circuit for improving isolation provided by the present disclosure is not only applicable to the rf electronic switch with one input end to two output ends, but also applicable to the circuit architecture form with one input end to multiple output ends, multiple input ends to multiple output ends or multiple input ends to one output end, and according to different numbers of input ends and output ends, the number and architecture of the isolation circuit and the load absorption structure provided by the present disclosure may be correspondingly modified and combined to improve the isolation between multiple ports, and are also within the protection scope of the present disclosure.

In addition, the above embodiments of the present disclosure are described in terms of the rf electronic switch adopting a series-parallel connection architecture (as shown in fig. 3), but the isolation circuit and the load absorption structure provided by the present disclosure are also applicable to rf electronic switches adopting a series connection architecture (as shown in fig. 1) or a parallel connection architecture (as shown in fig. 2) and other different architecture forms, and it is within the scope of the present disclosure to achieve a circuit form that improves the port isolation of the rf electronic switch by correspondingly deforming and connecting the isolation circuit and the load absorption structure corresponding to different architecture forms of the rf electronic switch.

The circuit for improving the isolation degree provided by the disclosure has the advantages that the isolation circuit is additionally arranged in the signal transmission circuit in the radio frequency electronic switch, the leakage signals among all output ports in the signal transmission circuit are respectively isolated through the first isolation module and the second isolation module in the isolation circuit, the isolation degree among all ports is improved, in addition, the load absorption structure is additionally arranged in the isolation circuit, the leakage signals of the ports are further absorbed, and the isolation degree among all ports is improved, the circuit for improving the isolation degree provided by the disclosure adopts different isolation modules (different isolation modules are arranged in the same isolation circuit) to isolate the leakage signals for different ports through the structure, and simultaneously, the leakage signals are further processed by matching with the load absorption structure, so that the dual improvement effect of the isolation degrees of the ports with different degrees can be achieved, and the problem of poor electromagnetic compatibility caused by low port isolation is avoided, and the performance of the device is improved.

The disclosed embodiments also provide a radio frequency electronic switch, as shown in fig. 7, including: a radio frequency electronic switch body 100 and an isolation circuit 102.

The radio frequency electronic switch body 100 comprises a signal transmission circuit 101, wherein the signal transmission circuit 101 is provided with an input end 10 and a plurality of output ends 20; the isolation circuit 102 is connected in the signal transmission circuit 101, and the isolation degree of the port of the radio frequency electronic switch is improved through the combined action of the first blocking module 1, the second blocking module 2 and the load absorption structure 3 in the isolation circuit 102, and the structural composition and the working principle of the isolation circuit 102 and the signal transmission circuit 101 are as described in the above embodiments of the present disclosure, and are not described herein again.

The radio frequency electronic switch provided by the disclosure comprises any one of the radio frequency electronic switches comprising the isolation circuit, has high isolation and excellent device performance, and can be widely applied to various occasions.

The present disclosure also provides a terminal, as shown in fig. 8, which may include components such as a Radio Frequency (RF) circuit 601, a memory 602 including one or more computer-readable storage media, an input unit 603, a display unit 604, a sensor 605, an audio circuit 606, a Wireless Fidelity (WiFi) module 607, a processor 608 including one or more processing cores, and a power supply 609. Those skilled in the art will appreciate that the terminal structure shown in fig. 8 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. Wherein:

the RF circuit 601 may be used for receiving and transmitting signals during a message transmission or communication process, and in particular, for receiving downlink messages from a base station and then processing the received downlink messages by one or more processors 608; in addition, data relating to uplink is transmitted to the base station. In general, the RF circuit 601 includes, but is not limited to, an antenna, at least one Amplifier, a tuner, one or more oscillators, a Subscriber Identity Module (SIM) card, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuitry 601 may also communicate with networks and other devices via wireless communications. The wireless communication may use any communication standard or protocol, including but not limited to Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Message Service (SMS), and the like.

The memory 602 may be used to store software programs and modules, and the processor 608 executes various functional applications and data processing by operating the software programs and modules stored in the memory 602. The memory 602 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (e.g., a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the mobile terminal, and the like. Further, the memory 602 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 602 may also include a memory controller to provide the processor 608 and the input unit 603 access to the memory 602. In this embodiment of the present invention, the memory 602 is configured to store a frequency band list corresponding to the isolation control module and a minimum loss pattern corresponding to a frequency band.

The input unit 603 may be used to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control. In some particular embodiments, input unit 603 may include a touch-sensitive surface as well as other input devices. The touch-sensitive surface, also referred to as a touch display screen or a touch pad, may collect touch operations by a user (e.g., operations by a user on or near the touch-sensitive surface using a finger, a stylus, or any other suitable object or attachment) thereon or nearby, and drive the corresponding connection device according to a predetermined program. Alternatively, the touch sensitive surface may comprise two parts, a touch detection means and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 608, and can receive and execute commands sent by the processor 608. In addition, touch sensitive surfaces may be implemented using various types of resistive, capacitive, infrared, and surface acoustic waves. The input unit 603 may include other input devices in addition to a touch-sensitive surface. In particular, other input devices may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.

The display unit 604 may be used to display information input by or provided to the user and various graphical user interfaces of the terminal, which may be made up of graphics, text, icons, video, and any combination thereof.

The Display unit 604 may include a Display panel, and optionally, the Display panel may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like. Further, the touch-sensitive surface may overlay the display panel, and when a touch operation is detected on or near the touch-sensitive surface, the touch operation is transmitted to the processor 608 to determine the type of touch event, and the processor 608 then provides a corresponding visual output on the display panel according to the type of touch event. Although in FIG. 8 the touch sensitive surface and the display panel are two separate components to implement input and output functions, in some embodiments the touch sensitive surface may be integrated with the display panel to implement input and output functions.

The terminal may also include at least one sensor 605, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display panel according to the brightness of ambient light, and a proximity sensor that may turn off the display panel and/or the backlight when the terminal moves to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications of identifying the gesture of a mobile phone (such as horizontal and vertical screen switching, related games, magnetometer gesture calibration), vibration identification related functions (such as pedometer and tapping), and the like; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be configured in the terminal, detailed description is omitted here.

The audio circuit 606, speaker, microphone may provide an audio interface between the user and the terminal. The audio circuit 606 may transmit the electrical signal converted from the received audio data to a speaker, and convert the electrical signal into a sound signal for output; on the other hand, the microphone converts the collected sound signal into an electric signal, which is received by the audio circuit 606 and converted into audio data, which is then processed by the audio data output processor 608, and then transmitted to, for example, another terminal via the RF circuit 601, or the audio data is output to the memory 602 for further processing. The audio circuit 606 may also include an earbud jack to provide communication of peripheral headphones with the terminal.

WiFi belongs to a short-distance wireless transmission technology, and the mobile terminal can help a user to receive and send emails, browse webpages, access streaming media and the like through the WiFi module 607, and provides wireless broadband internet access for the user. Although fig. 8 shows the WiFi module 607, it is understood that it does not belong to the essential constitution of the terminal, and can be omitted entirely as needed within the scope not changing the essence of the invention.

The processor 608 is a control center of the terminal, connects various parts of the entire mobile phone or computer using various interfaces and lines, performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 602 and calling data stored in the memory 602, thereby monitoring the mobile phone as a whole. Optionally, processor 608 may include one or more processing cores; preferably, the processor 608 may integrate an application processor, which primarily handles operating systems, user interfaces, applications, etc., and a modem processor, which primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 608.

The terminal also includes a power supply 609 (e.g., a battery) for powering the various components, which may preferably be logically coupled to the processor 608 via a power management system, such that functions such as managing charging, discharging, and power consumption are performed via the power management system. The power supply 609 may also include any component, such as one or more dc or ac power sources, recharging systems, power failure detection circuitry, power converters or inverters, power status indicators, and the like.

Although not shown, the terminal may further include a camera, a bluetooth module, etc., which will not be described herein. Specifically, in this embodiment, the processor 608 in the terminal loads an executable file corresponding to a process of one or more application programs into the memory 602 according to the following instructions, and the processor 608 runs the application programs stored in the memory 602, thereby implementing various functions.

The circuit, the radio frequency electronic switch and the terminal for improving the port isolation provided by the embodiment of the invention are introduced in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice in the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A circuit for improving port isolation, comprising:

2. The circuit for improving the isolation degree of the port according to claim 1, wherein the first blocking module comprises a third diode, a fifth diode and a third capacitor which are connected in series in sequence.

3. The circuit for improving port isolation of claim 2, wherein the third diode and the fifth diode have a second common node, and the first diode is connected to the second common node.

4. The circuit for improving port isolation according to claim 3, further comprising a seventh diode, one end of the seventh diode is connected to a third common node, the other end of the seventh diode is grounded, and the third common node is a common node between the second capacitor and the third diode.

5. The circuit for improving the isolation of the port according to claim 1, wherein the second blocking module comprises a fourth diode, a sixth diode and a fourth capacitor which are connected in series in sequence.

6. The circuit for improving port isolation of claim 5, wherein the fourth diode and the sixth diode have a fourth common node, and the second diode is connected to the fourth common node.

7. The circuit for improving port isolation as claimed in claim 6, further comprising an eighth diode, wherein one end of the eighth diode is connected to the fifth common node, the other end of the eighth diode is connected to ground, and the fifth common node is a common node between the fifth capacitor and the fourth diode.

8. The circuit for improving port isolation of claim 1, wherein the load absorbing structure is a load absorbing resistor.

9. A radio frequency electronic switch, comprising:

10. A terminal, comprising at least a processor, a memory, a radio frequency circuit and the radio frequency electronic switch of claim 9, wherein the memory and the radio frequency circuit are connected to the processor, the radio frequency electronic switch is connected to the radio frequency circuit, the processor is configured to process a signal, the memory is configured to store the signal, the radio frequency circuit is configured to receive and transmit the signal, and the radio frequency electronic switch is configured to control on/off of the signal in the radio frequency circuit.