CN219124188U - Radio frequency switch circuit - Google Patents
Radio frequency switch circuit Download PDFInfo
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- CN219124188U CN219124188U CN202320076058.9U CN202320076058U CN219124188U CN 219124188 U CN219124188 U CN 219124188U CN 202320076058 U CN202320076058 U CN 202320076058U CN 219124188 U CN219124188 U CN 219124188U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The application is applicable to the technical field of communication, and provides a radio frequency switch circuit which comprises N switch units of two-out-of-one type; the input end of a first signal selection unit in the two-out-of-one switch unit is used as a first signal input end of the two-out-of-one switch unit, the output end of the first signal selection unit is connected with the first input end of the signal output unit, the input end of a second signal selection unit is used as a second signal input end of the two-out-of-one switch unit, the output end of the second signal selection unit is connected with the second input end of the signal output unit, the output end of the signal output unit is used as a signal output end of the two-out-of-one switch unit, and a common joint point of the controlled end of the first signal selection unit and the controlled end of the second signal selection unit is used as the controlled end of the two-out-of-one switch unit; when N is greater than 1, the first signal input end and/or the second signal input end of each alternative switch unit are respectively connected with the signal output end of one other alternative switch unit, so that the cost of radio frequency signal switching can be reduced.
Description
Technical Field
The application belongs to the technical field of communication, and particularly relates to a radio frequency switch circuit.
Background
The radio frequency switch is also called a microwave switch and is used for realizing the function of converting a microwave signal channel. With the rapid development of communication technology, the application of the radio frequency switch is also becoming more and more widespread, for example, the radio frequency switch can be applied in a microwave test system as a signal route between a plurality of different devices to be tested and a tester.
However, the existing rf switch is usually in the form of a chip, and the price of the rf switch chip is generally high, which results in high cost for switching the rf signal.
Disclosure of Invention
In view of this, the embodiment of the application provides a radio frequency switch circuit to solve the technical problem that the cost of the existing radio frequency switch chip is generally higher, thereby leading to higher cost of radio frequency signal switching.
The embodiment of the application provides a radio frequency switch circuit, which comprises N alternative switch units, wherein N is a positive integer; the two-in-one switch unit comprises a first signal selection unit, a second signal selection unit and a signal output unit;
the input end of the first signal selection unit is used as a first signal input end of the one-out-of-two switching unit, the output end of the first signal selection unit is connected with the first input end of the signal output unit, the input end of the second signal selection unit is used as a second signal input end of the one-out-of-two switching unit, the output end of the second signal selection unit is connected with the second input end of the signal output unit, the output end of the signal output unit is used as a signal output end of the one-out-of-two switching unit, and a joint point of the controlled end of the first signal selection unit and the controlled end of the second signal selection unit is used as a controlled end of the one-out-of-two switching unit;
when N is greater than 1, the first signal input end and/or the second signal input end of each alternative switch unit are/is respectively connected with the signal output end of one other alternative switch unit;
the controlled end of the one-out-of-two switching unit is used for receiving a control signal, and the control signal is used for switching the radio frequency signal input from the first signal input end of the one-out-of-two switching unit and the radio frequency signal input from the second signal input end of the one-out-of-two switching unit.
In an alternative implementation manner, the first signal selecting unit includes a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, a third diode, a fourth diode and a first filtering unit;
the first end of the first capacitor is used as an input end of the first signal selection unit, the second end of the first capacitor, the anode of the first diode and the anode of the third diode are commonly connected to the first end of the first filtering unit, the cathode of the first diode is connected with the first end of the second capacitor, the common connection point of the second end of the second capacitor and the anode of the second diode is used as a controlled end of the first signal selection unit, the cathode of the second diode, the first end of the third capacitor and the anode of the fourth diode are commonly connected to the second end of the first filtering unit, the second end of the third capacitor is used as an output end of the first signal selection unit, and the cathode of the third diode and the cathode of the fourth diode are grounded.
In an alternative implementation, the length of the transmission line between the anode of the first diode and the anode of the third diode is 1/4 of a first preset wavelength, the length of the transmission line between the cathode of the second diode and the anode of the fourth diode is 1/4 of the first preset wavelength, and the first preset wavelength is the wavelength of the radio frequency signal transmitted in the first signal selection unit.
In an alternative implementation, the first filtering unit is a microstrip filtering unit.
In an optional implementation manner, the second signal selecting unit includes a fourth capacitor, a fifth capacitor, a sixth capacitor, a fifth diode, a sixth diode, a seventh diode, an eighth diode, and a second filtering unit;
the first end of the fourth capacitor is used as the input end of the second signal selection unit, the second end of the fourth capacitor, the anode of the fifth diode, the anode of the seventh diode, the anode of the eighth diode and the first end of the sixth capacitor are commonly connected to the cathode of the sixth diode, the cathode of the fifth diode is connected with the first end of the second filter unit, the second end of the second filter unit is connected with the first end of the fifth capacitor, the common connection point of the second end of the fifth capacitor and the anode of the sixth diode is used as the controlled end of the second signal selection unit, the second end of the sixth capacitor is used as the output end of the second signal selection unit, and the cathode of the seventh diode and the cathode of the eighth diode are both grounded.
In an alternative implementation manner, the length of the transmission line between the anode of the fifth diode and the anode of the seventh diode is 1/4 of a second preset wavelength, the length of the transmission line between the cathode of the sixth diode and the anode of the eighth diode is 1/4 of the second preset wavelength, and the second preset wavelength is the wavelength of the radio frequency signal transmitted in the second signal selection unit.
In an alternative implementation, the second filtering unit is a microstrip filtering unit.
In an alternative implementation manner, the signal output unit is a microstrip power divider, two input ends of the microstrip power divider are respectively used as a first input end and a second input end of the signal output unit, and an output end of the microstrip power divider is used as an output end of the signal output unit.
In an alternative implementation, the signal output unit includes a first resistor and a first microstrip line;
the common connection point of the first end of the first resistor and the first end of the first microstrip line is used as a first input end of the signal output unit, the common connection point of the second end of the first resistor and the second end of the first microstrip line is used as a second output end of the signal output unit, and the output end of the signal output unit is arranged between two ends of the first microstrip line.
In an alternative implementation, the first microstrip line is laid out as a symmetrical structure on the circuit board.
The radio frequency switch circuit provided by the embodiment of the application has the following beneficial effects:
according to the radio frequency switch circuit provided by the embodiment of the application, N two-out-of-one switch units are arranged, a first signal selection unit, a second signal selection unit and a signal output unit are arranged in each two-out-of-one switch unit, the input end of the first signal selection unit is used as the first signal input end of the two-out-of-one switch unit, the output end of the first signal selection unit is connected with the first input end of the signal output unit, the input end of the second signal selection unit is used as the second signal input end of the two-out-of-one switch unit, the output end of the second signal selection unit is connected with the second input end of the signal output unit, the output end of the signal output unit is used as the signal output end of the two-out-of-one switch unit, and the common joint point of the controlled end of the first signal selection unit and the controlled end of the second signal selection unit is used as the controlled end of the two-out-of-one switch unit; when N is greater than 1, the first signal input end and/or the second signal input end of each one of the two-to-one switching units are respectively connected with the signal output end of one other one of the two-to-one switching units, so that the controlled end of the one-to-one switching unit can switch the radio frequency signals input from the first signal input end of the one-to-one switching unit and the radio frequency signals input from the second signal input end of the one-to-one switching unit through receiving control signals. Compared with a radio frequency switch chip, the radio frequency switch circuit has lower cost, so that the cost of radio frequency signal switching can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a radio frequency switch circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a radio frequency switch circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a radio frequency switch circuit according to another embodiment of the present application.
Detailed Description
It is noted that the terminology used in the embodiments of the present application is used for the purpose of explaining specific embodiments of the present application only and is not intended to limit the present application. In the description of the embodiments of the present application, unless otherwise indicated, "a plurality" means two or more, and "at least one", "one or more" means one, two or more. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a definition of "a first", "a second" feature may explicitly or implicitly include one or more of such features.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The embodiment of the application provides a radio frequency switch circuit. Referring to fig. 1, a schematic architecture diagram of a radio frequency switch circuit according to an embodiment of the present application is provided. As shown in fig. 1, the rf switch circuit may include N alternative switch units 10, where N is a positive integer. The alternative switch unit 10 may include a first signal selecting unit 101, a second signal selecting unit 102, and a signal outputting unit 103.
Specifically, the input end of the first signal selecting unit 101 is used as the first signal input end IN1 of the one-OUT-of-two switching unit 10, the output end of the first signal selecting unit 101 is connected with the first input end of the signal output unit 103, the input end of the second signal selecting unit 102 is used as the second signal input end IN2 of the one-OUT-of-two switching unit 10, the output end of the second signal selecting unit 102 is connected with the second input end of the signal output unit 103, the output end of the signal output unit 103 is used as the signal output end OUT of the one-OUT-of-two switching unit 10, and the common point of the controlled end of the first signal selecting unit 101 and the controlled end of the second signal selecting unit 102 is used as the controlled end CTL of the one-OUT-of-two switching unit 10.
When N is greater than 1, the first signal input terminal IN1 and/or the second signal input terminal IN2 of each of the alternative switching units 10 may be connected to the signal output terminal OUT of one of the other alternative switching units 10, respectively. It should be noted that the other one-out-of-two switching units 10 refer to one-out-of-two switching units 10 that have no connection relationship with the current one-out-of-two switching unit 10.
The controlled terminal CTL of the one-out-of-two switching unit 10 may be configured to receive a control signal that may be configured to switch the radio frequency signal input from the first signal input terminal IN1 of the one-out-of-two switching unit 10 and the radio frequency signal input from the second signal input terminal IN2 of the one-out-of-two switching unit 10.
The control signals may include, for example, a high level control signal and a low level control signal.
As can be seen from the above, in the radio frequency switch circuit provided in this embodiment of the present application, by setting N one-out-of-two switch units, and setting a first signal selecting unit, a second signal selecting unit, and a signal output unit in each one-out-of-two switch unit, an input end of the first signal selecting unit is used as a first signal input end of the one-out-of-two switch unit, an output end of the first signal selecting unit is connected with a first input end of the signal output unit, an input end of the second signal selecting unit is used as a second signal input end of the one-out-of-two switch unit, an output end of the second signal selecting unit is connected with a second input end of the one-out-of-two switch unit, an output end of the signal output unit is used as a signal output end of the one-out-of-two switch unit, and a common point between a controlled end of the first signal selecting unit and a controlled end of the second signal selecting unit is used as a controlled end of the one-out-of-two switch unit. When N is greater than 1, the first signal input end and/or the second signal input end of each one of the two-to-one switching units are respectively connected with the signal output end of one other one of the two-to-one switching units, so that the controlled end of the one-to-one switching unit can switch the radio frequency signals input from the first signal input end of the one-to-one switching unit and the radio frequency signals input from the second signal input end of the one-to-one switching unit through receiving control signals. Compared with a radio frequency switch chip, the radio frequency switch circuit has lower cost, so that the cost of radio frequency signal switching can be reduced.
Fig. 2 is a schematic circuit diagram of a radio frequency switch circuit according to an embodiment of the present application. As shown in fig. 2, in an embodiment of the present application, the first signal selecting unit 101 may include a first capacitor C1, a second capacitor C2, a third capacitor C3, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a first filtering unit 1011.
The first end of the first capacitor C1 is used as the input end of the first signal selecting unit 101, the second end of the first capacitor C1, the anode of the first diode D1 and the anode of the third diode D3 are commonly connected to the first end of the first filtering unit 1011, the cathode of the first diode D1 is connected to the first end of the second capacitor C2, the common connection point of the second end of the second capacitor C2 and the anode of the second diode D2 is used as the controlled end of the first signal selecting unit 101, the cathode of the second diode D2, the first end of the third capacitor C3 and the anode of the fourth diode D4 are commonly connected to the second end of the first filtering unit 1011, the second end of the third capacitor C3 is used as the output end of the first signal selecting unit 101, and the cathode of the third diode D3 and the cathode of the fourth diode D4 are grounded.
The length of the transmission line between the anode of the first diode D1 and the anode of the third diode D3 may be 1/4 of the first preset wavelength, and the length of the transmission line between the cathode of the second diode D2 and the anode of the fourth diode D4 may be 1/4 of the first preset wavelength, which is the wavelength of the radio frequency signal transmitted in the first signal selection unit 101. In a specific application, the wavelength of the radio frequency signal transmitted in the first signal selection unit 101 may be determined according to the frequency of the radio frequency signal transmitted in the first signal selection unit 101.
By setting the length of the transmission line between the anode of the first diode D1 and the anode of the third diode D3 and the length of the transmission line between the cathode of the second diode D2 and the anode of the fourth diode D4 to 1/4 of the first preset wavelength, the impedance of the point m to the short-circuit point of the third diode D3 (i.e., the cathode of the third diode D3) and the impedance of the point n to the short-circuit point of the fourth diode D4 (i.e., the cathode of the fourth diode D4) become infinite when all the diodes in the first signal selecting unit 101 are turned on.
The first filtering unit 1011 may be configured to filter the radio frequency signal input from the input terminal of the first signal selecting unit 101, so as to prevent the radio frequency signal from being transmitted to the signal output unit 103.
The first filtering unit 1011 may be a microstrip filtering unit, for example.
For example, the first capacitor C1, the second capacitor C2 and the third capacitor C3 may be blocking capacitors, so as to avoid the influence of the current flowing through the first signal selecting unit 101 on other circuits in the front-back stage when the alternative switch unit 10 is in the power-on state.
The first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 may be PIN diodes, for example.
The PIN diode is a diode with a P-I-N structure 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.
In another embodiment of the present application, the second signal selecting unit 102 may include a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, and a second filtering unit 1021.
The first end of the fourth capacitor C4 is used as the input end of the second signal selecting unit 102, the second end of the fourth capacitor C4, the anode of the fifth diode D5, the anode of the seventh diode D7, the anode of the eighth diode D8 and the first end of the sixth capacitor C6 are commonly connected to the cathode of the sixth diode D6, the cathode of the fifth diode D5 is connected to the first end of the second filtering unit 1021, the second end of the second filtering unit 1021 is connected to the first end of the fifth capacitor C5, the common connection point of the second end of the fifth capacitor C5 and the anode of the sixth diode D6 is used as the controlled end of the second signal selecting unit 102, the second end of the sixth capacitor C6 is used as the output end of the second signal selecting unit 102, and the cathode of the seventh diode D7 and the cathode of the eighth diode D8 are grounded.
The length of the transmission line between the anode of the fifth diode D5 and the anode of the seventh diode D7 is 1/4 of the second preset wavelength, and the length of the transmission line between the cathode of the sixth diode D6 and the anode of the eighth diode D8 is 1/4 of the second preset wavelength, which is the wavelength of the radio frequency signal transmitted in the second signal selecting unit 102. In a specific application, the wavelength of the radio frequency signal transmitted in the second signal selection unit 102 may be determined according to the frequency of the radio frequency signal transmitted in the second signal selection unit 102.
By setting the length of the transmission line between the anode of the fifth diode D5 and the anode of the seventh diode D7 and the length of the transmission line between the cathode of the sixth diode D6 and the anode of the eighth diode D8 to 1/4 of the second preset wavelength, the impedance of the o-point to the short-circuit point of the seventh diode D7 (i.e., the cathode of the seventh diode D7) and the impedance of the p-point to the short-circuit point of the eighth diode D8 (i.e., the cathode of the eighth diode D8) become infinite when all the diodes in the second signal selection unit 102 are turned on.
The second filtering unit 1021 may be configured to filter the radio frequency signal input from the input terminal of the second signal selecting unit 102, so as to prevent the radio frequency signal from being transmitted to the signal output unit 103.
The second filtering unit 1021 may be a microstrip filtering unit, for example.
The fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 may be dc blocking capacitors, so as to avoid the influence of the current flowing through the second signal selecting unit 102 on other circuits in the front-back stage when the alternative switch unit 10 is in the power-on state.
Illustratively, the fifth diode D5, the sixth diode D6, the seventh diode D7, and the eighth diode D8 may be PIN diodes.
In yet another embodiment of the present application, the signal output unit 103 may be a microstrip power divider, where two input ends of the microstrip power divider are respectively used as a first input end and a second input end of the signal output unit 103, and an output end of the microstrip power divider is used as an output end of the signal output unit 103. The signals input by the two input ends of the signal output unit 103 can be combined through the microstrip power divider, so that the isolation degree of the signal output unit 103 is increased.
In still another embodiment of the present application, the signal output unit 103 may include a first resistor R1 and a first microstrip line 1031.
The common point of the first end of the first resistor R1 and the first end of the first microstrip line 1031 is used as the first input end of the signal output unit 103, the common point of the second end of the first resistor R1 and the second end of the first microstrip line 1031 is used as the second output end of the signal output unit 103, and the output end of the signal output unit 103 may be disposed between two ends of the first microstrip line 1031.
The output terminal of the signal output unit 103 may be disposed at any one position between both ends of the first microstrip line 1031, for example, may be disposed at a midpoint of the first microstrip line 1031.
In a specific application, the first microstrip line 1031 may be laid out as a symmetrical structure on the circuit board.
The following describes the working principle of the radio frequency switch circuit provided in the embodiment of the present application with reference to fig. 2.
When the controlled terminal CTL of the second switching unit 10 inputs the high-level control signal, all diodes IN the first signal selecting unit 101 and the second signal selecting unit 102 are turned on, and since the cathode of the third diode D3, the cathode of the fourth diode D4, the cathode of the seventh diode D7 and the cathode of the eighth diode D8 are all shorted to ground, according to the characteristics of the 1/4 wavelength transmission line, the impedance of the short-circuit point of the m point to the third diode D3 is infinite, the impedance of the n point to the short-circuit point of the fourth diode D4 is infinite, the impedance of the o point to the short-circuit point of the seventh diode D7 is infinite, the impedance of the p point to the short-circuit point of the eighth diode D8 is infinite, therefore, the radio frequency signal input from the first signal input terminal IN1 of the second switching unit 10 can only be filtered from the upper branch of the first signal selecting unit 101 (i.e., the first capacitor C1, the second capacitor C2, the second capacitor D2, the second diode D2 and the third capacitor C3) to the impedance of the short-circuit point of the third diode D3 is infinite, and the radio frequency signal input from the second signal input terminal IN1 of the second switching unit 10 can only be filtered from the first signal input terminal IN1 to the second switching unit 10 through the second switching unit 10, the second signal input terminal IN the fifth signal input terminal IN 1021 is filtered from the first signal input terminal IN 10 through the second switching unit 10, the second signal input terminal IN 5 of the second switching unit 10, and the fifth signal input terminal IN the second signal input terminal IN1 can be filtered from the fifth signal input from the fifth switching unit 10 through the second switching unit 10 input terminal IN 3.
When the controlled terminal CTL of the one-OUT-of-two switching unit 10 inputs the low level control signal, all diodes IN the first signal selecting unit 101 and the second signal selecting unit 102 are turned off, so that the radio frequency signal input from the first signal input terminal IN1 of the one-OUT-of-two switching unit 10 can only pass through the lower branch of the first signal selecting unit 101 (i.e., the branch where the first filtering unit 1011 is located), the radio frequency signal input from the second signal input terminal IN2 of the one-OUT-of-two switching unit 10 can only pass through the lower branch of the second signal selecting unit 102, and since the first filtering unit 1011 filters the radio frequency signal input from the first signal input terminal IN1 of the one-OUT-of-two switching unit 10, the signal output unit 103 can only receive the radio frequency signal input from the second signal input terminal IN2 of the one-OUT-of-two switching unit 10 and output the radio frequency signal input from the second signal input terminal IN2 of the one-OUT-of-two switching unit 10 through the signal output terminal OUT.
As can be seen, when the controlled terminal CTL of the one-out-of-two switching unit 10 inputs a high level control signal, the one-out-of-two switching unit 10 outputs the radio frequency signal inputted from the first signal input terminal IN1 thereof; when the controlled terminal CTL of the one-out-of-two switching unit 10 inputs the low-level control signal, the one-out-of-two switching unit 10 outputs the radio frequency signal inputted from the second signal input terminal IN2 thereof, thereby realizing switching of the radio frequency signal inputted from the first signal input terminal IN1 thereof and the radio frequency signal inputted from the second signal input terminal IN2 thereof.
When the radio frequency switch circuit includes a plurality of one-out-of-two switch units 10, the working principle of each one-out-of-two switch unit 10 is the same as that of the other one-out-of-two switch unit 10, and the working principle of each one-out-of-two switch unit 10 is not repeated here.
For example, taking the radio frequency switch circuit including three switch units (a first switch unit, a second switch unit, and a third switch unit) as an example, as shown IN fig. 3, the signal output terminal OUT2 of the second switch unit may be connected to the first signal input terminal IN11 of the first switch unit, the signal output terminal OUT3 of the third switch unit may be connected to the second signal input terminal IN12 of the first switch unit, the output terminal OUT1 of the first switch unit may be used as an output terminal of the radio frequency switch circuit, and the first signal input terminal IN21 of the second switch unit, the second signal input terminal IN22 of the second switch unit, the first signal input terminal IN31 of the third switch unit, and the second signal input terminal IN32 of the third switch unit may be used as four input terminals of the radio frequency switch circuit, respectively.
Based on this, when the radio frequency switch circuit needs to select the radio frequency signal input by the first input terminal IN21 of the second alternative switch unit to output, a high level control signal may be input to both the controlled terminal CTL2 of the second alternative switch unit and the controlled terminal CTL1 of the first alternative switch unit; when the radio frequency switch circuit needs to select the radio frequency signal input by the second input end IN22 of the second alternative switch unit to output, a low level control signal can be input at the controlled end CTL2 of the second alternative switch unit, and a high level control signal can be input at the controlled end CTL1 of the first alternative switch unit;
when the radio frequency switch circuit needs to select the radio frequency signal input by the first input end IN31 of the third one-out-of-two switch unit for output, a high level control signal can be input to the controlled end CTL2 of the third one-out-of-two switch unit, and a low level control signal can be input to the controlled ends CTL1 of the first one-out-of-two switch unit; when the radio frequency switch circuit needs to select the radio frequency signal input by the second input terminal IN32 of the third one-out-of-two switch unit for outputting, the low level control signal may be input to both the controlled terminal CTL2 of the third one-out-of-two switch unit and the controlled terminal CTL1 of the first one-out-of-two switch unit.
Thus, the switching of four paths of radio frequency signals can be realized.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference may be made to related descriptions of other embodiments.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. The radio frequency switch circuit is characterized by comprising N alternative switch units, wherein N is a positive integer; the two-in-one switch unit comprises a first signal selection unit, a second signal selection unit and a signal output unit;
the input end of the first signal selection unit is used as a first signal input end of the one-out-of-two switching unit, the output end of the first signal selection unit is connected with the first input end of the signal output unit, the input end of the second signal selection unit is used as a second signal input end of the one-out-of-two switching unit, the output end of the second signal selection unit is connected with the second input end of the signal output unit, the output end of the signal output unit is used as a signal output end of the one-out-of-two switching unit, and a joint point of the controlled end of the first signal selection unit and the controlled end of the second signal selection unit is used as a controlled end of the one-out-of-two switching unit;
when N is greater than 1, the first signal input end and/or the second signal input end of each alternative switch unit are/is respectively connected with the signal output end of one other alternative switch unit;
the controlled end of the one-out-of-two switching unit is used for receiving a control signal, and the control signal is used for switching the radio frequency signal input from the first signal input end of the one-out-of-two switching unit and the radio frequency signal input from the second signal input end of the one-out-of-two switching unit.
2. The radio frequency switching circuit according to claim 1, wherein the first signal selection unit comprises a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, a third diode, a fourth diode, and a first filter unit;
the first end of the first capacitor is used as an input end of the first signal selection unit, the second end of the first capacitor, the anode of the first diode and the anode of the third diode are commonly connected to the first end of the first filtering unit, the cathode of the first diode is connected with the first end of the second capacitor, the common connection point of the second end of the second capacitor and the anode of the second diode is used as a controlled end of the first signal selection unit, the cathode of the second diode, the first end of the third capacitor and the anode of the fourth diode are commonly connected to the second end of the first filtering unit, the second end of the third capacitor is used as an output end of the first signal selection unit, and the cathode of the third diode and the cathode of the fourth diode are grounded.
3. The radio frequency switching circuit according to claim 2, wherein a length of a transmission line between an anode of the first diode and an anode of the third diode is 1/4 of a first preset wavelength, a length of a transmission line between a cathode of the second diode and an anode of the fourth diode is 1/4 of the first preset wavelength, and the first preset wavelength is a wavelength of a radio frequency signal transmitted in the first signal selecting unit.
4. The radio frequency switching circuit of claim 2, wherein the first filtering unit is a microstrip filtering unit.
5. The radio frequency switching circuit according to claim 1, wherein the second signal selecting unit comprises a fourth capacitor, a fifth capacitor, a sixth capacitor, a fifth diode, a sixth diode, a seventh diode, an eighth diode, and a second filtering unit;
the first end of the fourth capacitor is used as the input end of the second signal selection unit, the second end of the fourth capacitor, the anode of the fifth diode, the anode of the seventh diode, the anode of the eighth diode and the first end of the sixth capacitor are commonly connected to the cathode of the sixth diode, the cathode of the fifth diode is connected with the first end of the second filter unit, the second end of the second filter unit is connected with the first end of the fifth capacitor, the common connection point of the second end of the fifth capacitor and the anode of the sixth diode is used as the controlled end of the second signal selection unit, the second end of the sixth capacitor is used as the output end of the second signal selection unit, and the cathode of the seventh diode and the cathode of the eighth diode are both grounded.
6. The radio frequency switching circuit according to claim 5, wherein a length of a transmission line between an anode of the fifth diode and an anode of the seventh diode is 1/4 of a second preset wavelength, a length of a transmission line between a cathode of the sixth diode and an anode of the eighth diode is 1/4 of the second preset wavelength, and the second preset wavelength is a wavelength of the radio frequency signal transmitted in the second signal selecting unit.
7. The radio frequency switching circuit of claim 5, wherein the second filter unit is a microstrip filter unit.
8. The radio frequency switching circuit according to claim 1, wherein the signal output unit is a microstrip power divider, two input terminals of the microstrip power divider are respectively used as a first input terminal and a second input terminal of the signal output unit, and an output terminal of the microstrip power divider is used as an output terminal of the signal output unit.
9. The radio frequency switching circuit according to claim 8, wherein the signal output unit includes a first resistor and a first microstrip line;
the common connection point of the first end of the first resistor and the first end of the first microstrip line is used as a first input end of the signal output unit, the common connection point of the second end of the first resistor and the second end of the first microstrip line is used as a second output end of the signal output unit, and the output end of the signal output unit is arranged between two ends of the first microstrip line.
10. The radio frequency switching circuit of claim 9, wherein the first microstrip line is laid out as a symmetrical structure on a circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320076058.9U CN219124188U (en) | 2023-01-10 | 2023-01-10 | Radio frequency switch circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320076058.9U CN219124188U (en) | 2023-01-10 | 2023-01-10 | Radio frequency switch circuit |
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| CN219124188U true CN219124188U (en) | 2023-06-02 |
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| CN (1) | CN219124188U (en) |
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