CN117674893A - Single-pole double-throw switch circuit with power-off protection function - Google Patents
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Abstract
The invention relates to the field of communication technology and radio frequency switches, in particular to a single-pole double-throw switch circuit with a power-off protection function, which comprises: when the voltage of the power supply end is zero volt, that is, when the power supply end of the switch fails in power failure, no matter the voltage provided by the voltage control end is zero or not, the first filtering module can enable the radio frequency signal to be smoothly transmitted from the radio frequency signal transmitting end to the radio frequency signal public end, and the second filtering module can prevent the radio frequency signal from being transmitted from the radio frequency signal public end to the radio frequency signal receiving end. In the prior art, when the power supply end of the switch fails, the radio frequency signal transmitting end cannot transmit signals to the radio frequency signal public end, and the radio frequency switch cannot work normally.
Description
Technical Field
The invention relates to the field of communication technology and radio frequency switches, in particular to a single-pole double-throw switch circuit with a power-off protection function.
Background
The radio frequency switch is a circuit for controlling the on-off of a radio frequency signal and selecting a transmission channel, is an important device in a radio frequency front-end module, and has wide application in various commercial fields, such as: cellular communications, point-to-point communications systems, hand-held devices, radar systems, automatic test equipment, automotive telecommunications, and the like. In the prior art, when the switch fails in power supply due to the influence of external environment, the whole radio frequency front-end module cannot work normally, so that signal transmission can be influenced.
Therefore, research on the single pole double throw switch with the power-off protection function has very important value and significance.
Disclosure of Invention
The embodiment of the invention provides a single-pole double-throw switch circuit with a power-off protection function, which at least solves the technical problem that the whole radio frequency front-end module cannot work normally when the power supply of a switch fails.
According to an embodiment of the present invention, there is provided a single pole double throw switch circuit with a power off protection function, including:
the radio frequency signal transmitting end is used for transmitting or transmitting radio frequency signals to the radio frequency signal public end;
the radio frequency signal receiving end is connected with the radio frequency signal public end and is used for receiving the radio frequency signal sent by the radio frequency signal public end;
one end of the first filtering module is connected with the radio frequency signal transmitting end, the other end of the first filtering module is connected with the radio frequency signal public end and the second filtering module, and the first filtering module is grounded;
one end of the second filtering module is connected with the first filtering module and the radio frequency signal public end, the other end of the second filtering module is connected with the radio frequency signal receiving end, and the second filtering module is grounded;
the power supply end is respectively connected with the first filtering module and the second filtering module and is used for providing voltage for the switching circuit;
the voltage control end is respectively connected with the first filtering module and the second filtering module and is used for controlling the voltages of the first filtering module and the second filtering module;
the radio frequency signal public end is respectively connected with the first filtering module and the second filtering module and is used for transmitting the radio frequency signals;
when the voltage of the power supply end is not zero, the power supply end supplies power normally, the radio frequency signal transmitting end can transmit the radio frequency signal to the radio frequency signal public end through the first filtering module, and the radio frequency signal public end can transmit the radio frequency signal to the radio frequency signal receiving end through the second filtering module;
when the voltage of the power supply end is zero, the radio frequency signal transmitting end transmits the radio frequency signal to the radio frequency signal public end through the first filtering module; the second filtering module blocks the radio frequency signals from being transmitted from the radio frequency signal public end to the radio frequency signal receiving end.
The embodiment of the invention has the beneficial effects that: when the voltage of the power supply end is zero volt, that is, the power supply end of the switch fails, no matter the voltage provided by the voltage control end is zero or is not zero, the first filtering module can enable the radio frequency signal to be smoothly transmitted from the radio frequency signal transmitting end to the radio frequency signal public end, and the second filtering module prevents the radio frequency signal from being transmitted from the radio frequency signal public end to the radio frequency signal receiving end. In the prior art, when the power supply end of the switch fails, the radio frequency signal transmitting end cannot transmit signals to the radio frequency signal public end, the radio frequency switch cannot work normally, and the transmitting channel can still work normally even under the condition of power supply failure.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of a switching circuit according to the present invention
FIG. 2 is a schematic diagram of a switch circuit according to the present invention;
FIG. 3 is an equivalent circuit diagram of the transistor of the present invention when turned on;
fig. 4 is an equivalent circuit diagram of the transistor of the present invention when turned off.
Reference numerals:
the device comprises a TX-radio frequency signal transmitting end, an RX-radio frequency signal receiving end, a Vdd-power supply end, a Vctl-voltage control end, an RFC-radio frequency signal public end, a 1-first filtering module and a 2-second filtering module;
m1-first transistor, M2 second transistor, L1 first inductance, L2 second inductance, C1-first capacitance, C2-second capacitance, C3-third capacitance, C4-fourth capacitance, C5-fifth capacitance, C6-sixth capacitance, R1-first resistance, R2-second resistance, R3-third resistance, R4-fourth resistance.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an embodiment of the present invention, there is provided a single pole double throw switch circuit with power off protection function, referring to fig. 1, the switch circuit includes:
the radio frequency signal transmitting terminal TX is used for transmitting or transmitting radio frequency signals to the radio frequency signal public terminal RFC;
the radio frequency signal receiving terminal RX is connected with the radio frequency signal public terminal RFC and is used for receiving radio frequency signals sent by the radio frequency signal public terminal RFC;
one end of the first filtering module 1 is connected with the radio frequency signal transmitting end TX, the other end of the first filtering module 1 is connected with the radio frequency signal common end RFC and the second filtering module 2, and the first filtering module 1 is grounded;
one end of the second filtering module 2 is respectively connected with the first filtering module 1 and the radio frequency signal common terminal RFC, the other end of the second filtering module 2 is connected with the radio frequency signal receiving terminal RX, and the second filtering module 2 is grounded;
the power supply end Vdd is respectively connected with the first filter module 1 and the second filter module 2 and is used for providing voltage for the switch circuit;
the voltage control end Vctl is respectively connected with the first filtering module 1 and the second filtering module 2 and is used for controlling the voltages of the first filtering module 1 and the second filtering module 2;
the radio frequency signal public terminal RFC is respectively connected with the first filtering module 1 and the second filtering module 2 and is used for transmitting radio frequency signals;
when the voltage of the power supply terminal Vdd is not zero, the power supply terminal Vdd supplies power normally, the radio frequency signal transmitting terminal TX can transmit radio frequency signals to the radio frequency signal common terminal RFC through the first filtering module 1, and the radio frequency signal common terminal RFC can transmit radio frequency signals to the radio frequency signal receiving terminal RX through the second filtering module 2;
when the voltage of the power supply terminal Vdd is zero, the radio frequency signal transmitting terminal TX transmits a radio frequency signal to the radio frequency signal common terminal RFC through the first filtering module 1; the second filtering module 2 blocks the transmission of the radio frequency signal from the radio frequency signal common terminal RFC to the radio frequency signal receiving terminal RX.
Specifically, when the radio frequency switch power supply terminal Vdd supplies power normally and the radio frequency signal common terminal RFC is turned on to the radio frequency signal transmitting terminal TX, the radio frequency signal can be transmitted from the radio frequency signal transmitting terminal TX to the radio frequency signal common terminal RFC. When the power supply terminal Vdd of the radio frequency switch supplies power normally and the common terminal RFC of the radio frequency signal is conducted to the receiving terminal RX of the radio frequency signal, the radio frequency signal can be transmitted from the common terminal RFC of the radio frequency signal to the receiving terminal RX of the radio frequency signal. When the power supply terminal Vdd of the radio frequency switch fails, the radio frequency signal can still be transmitted from the radio frequency signal transmitting terminal TX to the radio frequency signal common terminal RFC.
According to the power supply circuit, when the voltage of the power supply terminal Vdd is zero volt, namely, when the switch power supply terminal Vdd fails, no matter the voltage provided by the voltage control terminal Vctl is zero or is not zero, the first filtering module 1 can enable radio frequency signals to be smoothly transmitted from the radio frequency signal transmitting terminal TX to the radio frequency signal public terminal RFC, and the second filtering module 2 prevents radio frequency signals from being transmitted from the radio frequency signal public terminal RFC to the radio frequency signal receiving terminal RX. That is, in the prior art, when the switch power supply terminal Vdd fails, the radio frequency signal transmitting terminal TX cannot transmit signals to the radio frequency signal receiving terminal RX, and the present application can still realize that the transmitting path can still work normally even under the power failure condition.
Specifically, when the radio frequency switch power supply terminal Vdd supplies power normally and the radio frequency signal common terminal RFC is turned on to the radio frequency signal transmitting terminal TX, the radio frequency signal can be transmitted from the radio frequency signal transmitting terminal TX to the radio frequency signal common terminal RFC. When the power supply terminal Vdd of the radio frequency switch supplies power normally and the common terminal RFC of the radio frequency signal is conducted to the receiving terminal RX of the radio frequency signal, the radio frequency signal can be transmitted from the common terminal RFC of the radio frequency signal to the receiving terminal RX of the radio frequency signal. When the power supply terminal Vdd of the radio frequency switch fails, the radio frequency signal can still be transmitted from the radio frequency signal transmitting terminal TX to the radio frequency signal common terminal RFC.
In some embodiments, referring to fig. 1 and 2, the first filtering module 1 includes: the first inductor L1, the first capacitor C1, the first resistor R1, the third resistor R3 and the first transistor M1; the grid electrode of the first transistor M1 is connected with the voltage control end Vctl through a first resistor R1, the source electrode of the first transistor M1 is connected with the radio frequency signal transmitting end TX through a fifth capacitor C5, the drain electrode of the first transistor M1 is connected with the radio frequency signal common end RFC through a fourth capacitor C4, the drain electrode of the first transistor M1 is respectively connected with the power supply end Vdd and the second filtering module 2 through a third resistor R3, and the drain electrode of the first transistor M1 is grounded through the first capacitor C1;
one end of the first capacitor C1 is grounded, and the other end of the first capacitor C1 is connected with the drain electrode of the first transistor M1;
one end of the first inductor L1 is connected to the source of the first transistor M1 and connected to the fifth capacitor C5, and the other end of the first inductor L1 is connected to the end of the first capacitor C1 far away from the ground.
The second filtering module 2 includes a second transistor M2, a second inductor L2, a second capacitor C2, a third capacitor C3, a second resistor R2, and a fourth resistor R4;
the grid electrode of the second transistor M2 is connected with the voltage control end Vctl through a second resistor R2, the source electrode of the second transistor M2 is connected with the radio frequency signal receiving end RX through a sixth capacitor C6, the drain electrode of the second transistor M2 is respectively connected with the power supply end Vdd and the first filtering module 1 through a fourth resistor R4, and the drain electrode of the second transistor M2 is grounded through a second capacitor C2;
one end of the second inductor L2 is connected with the radio frequency signal common terminal RFC through a fourth capacitor C4, and the other end of the second inductor L2 is connected with the source electrode of the second transistor M2;
one end of the second capacitor C2 is connected with the drain electrode of the second transistor M2, and the other end of the second capacitor C2 is grounded;
one end of the third capacitor C3 is connected to the source of the second transistor M2, and the other end of the third capacitor C3 is grounded.
Specifically, the first transistor M1 and the second transistor M2 used in the present invention are depletion transistors, the pinch-off voltage Vp thereof is negative, and the on-off of the transistors is determined by the gate-source voltage Vgs of the two transistors. When Vgs > Vp, then the transistor is turned on; when Vgs is less than or equal to Vp, the transistor is turned off.
For example, when the voltage of the power supply terminal Vdd is 5V and the voltage of the voltage control terminal Vctl is 5V, the gate-source voltages Vgs of the first transistor M1 and the second transistor M2 are both positive values, the first transistor M1 and the second transistor M2 are turned on in the forward direction, and the first inductor L1, the first capacitor C4 and an equivalent circuit (as shown in fig. 3) form a band-pass filter network when the first transistor M1 is turned on, so that the radio frequency signal is smoothly transmitted from the radio frequency signal transmitting terminal TX to the radio frequency signal common terminal RFC. The second inductor L2, the second capacitor C2, the third capacitor C3 and the equivalent circuit form a filter network when the second transistor M2 is turned on, so as to prevent the radio frequency signal from being transmitted from the radio frequency signal common terminal RFC to the radio frequency signal receiving terminal RX, and the second filter module is the filter network.
When the voltage of the power supply terminal Vdd is 5V and the voltage Vctl of the control terminal is 0V, the gate-source voltages of the first transistor M1 and the second transistor M2 are-5V, which is far smaller than the pinch-off voltage Vp, the first transistor M1 and the second transistor M2 are turned off, the second inductor L2, the second capacitor C2, the third capacitor C3 and an equivalent circuit (as shown in fig. 4) form a band-pass filter network (a second filter module) when the second transistor M2 is turned off, so that the radio frequency signal is smoothly transmitted from the radio frequency signal common terminal RFC to the radio frequency signal receiving terminal RX, and the first inductor L1, the first capacitor C1 and the equivalent circuit form the filter network (the first filter module 1) when the first transistor M1 is turned off, which blocks the radio frequency signal from the radio frequency signal transmitting terminal TX to the radio frequency signal common terminal RFC.
When the voltage of the power supply terminal Vdd is 0V, that is, when the switch power supply terminal Vdd fails, no matter the voltage of the voltage control terminal Vctl is 0V or 5V, the gate-source voltage Vgs of the first transistor M1 and the second transistor M2 is positive, the first transistor M1 and the second transistor M2 are turned on in the forward direction, the first inductor L1, the first capacitor C1 and the equivalent circuit when the first transistor M1 is turned on form a band-pass filter network (the first filter module 1), so that the radio frequency signal is smoothly transmitted from the radio frequency signal transmitting terminal TX to the radio frequency signal common terminal RFC, and the second inductor L2, the second capacitor C2, the third capacitor C3 and the equivalent circuit when the second transistor M2 is turned on form a filter network (the second filter module), which prevents the radio frequency signal from being transmitted from the radio frequency signal common terminal RFC to the radio frequency signal receiving terminal RX, that is, the transmitting path can still work normally under the condition of power failure.
Specifically, one end of the fourth capacitor C4 is connected to the radio frequency signal common terminal RFC, the other end of the fourth capacitor C4 is connected to the drain of the first transistor M1, and the other end of the fourth capacitor C4 is further connected to the source of the second transistor M2 through the second inductor L2. One end of the fifth capacitor C5 is connected to the rf signal transmitting terminal TX, and the other end of the fifth capacitor C5 is connected to the source of the first transistor M1. One end of the sixth capacitor C6 is connected with the radio frequency signal receiving end RX, and the other end of the sixth capacitor C6 is connected with the source electrode of the second transistor M2.
Specifically, one end of the first resistor R1 is connected to the voltage control terminal Vctl, and the other end of the first resistor R1 is connected to the gate of the first transistor M1. One end of the second resistor R2 is connected to the voltage control terminal Vctl, and the other end of the second resistor R2 is connected to the gate of the second transistor M2. One end of the third resistor R3 is connected to the drain of the first transistor M1, and the other end of the third resistor R3 is connected to the power supply terminal Vdd. One end of the fourth resistor R4 is connected to the power supply terminal Vdd, and the other end of the fourth resistor R4 is connected to the drain of the second transistor M2.
Specifically, the switching circuit includes a first transistor M1, a second transistor M2, bias resistors R1 to R4 (including a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4), capacitors C1 to C6 (including a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6), a first inductor L1, and a second inductor L2.
The first transistor M1 and the second transistor M2 are used as switches to control the working state of the radio frequency switch.
The drain electrode of the first transistor M1 is connected to the third resistor R3, the fourth capacitor C4, the first capacitor C1 and the first inductor L1, the other end of the fourth capacitor C4 is connected to the radio frequency signal common terminal RFC, and the other end of the first capacitor C1 is grounded. The source of the first transistor M1 is connected to the fifth capacitor C5 and the other end of the first inductor L1, and the other end of the fifth capacitor C5 is connected to the radio frequency signal transmitting terminal TX. The gate of the first transistor M1 is connected to the first resistor R1.
The drain electrode of the second transistor M2 is connected to the fourth resistor R4 and the second capacitor C2, and the other end of the second capacitor C2 is grounded. The source electrode of the second transistor M2 is connected with the third capacitor C3, the second inductor L2 and the sixth capacitor C6; the other end of the sixth capacitor C6 is connected with the radio frequency signal receiving end RX, the other end of the third capacitor C3 is grounded, and the other end of the second inductor L2 is connected with the fourth capacitor C4. The gate of the second transistor M2 is connected to the second resistor R2. The other end of the first resistor R1 and the other end of the second resistor R2 are connected to the control terminal Vctl. The other end of the third resistor R3 and the other end of the fourth resistor R4 are connected to the power supply terminal Vdd.
The bias resistors R1-R4 are used for providing isolation between direct current and radio frequency and preventing radio frequency signals from leaking. And a DC blocking (DC Block) capacitor C4-C6 for providing isolation between DC and RF, and ensuring that the DC voltage of the first transistor M1 and the second transistor M2 operates within a proper range to realize normal switching of the transistors. Capacitors C1-C3, a first inductor L1 and a second inductor L2 for filtering and matching when the switch gates the RF signal receiving end RX branch or the RF signal transmitting end TX branch
When the power supply terminal Vdd of the radio frequency switch supplies power normally and the common terminal RFC of the radio frequency signal is conducted to the transmitting terminal TX of the radio frequency signal, the radio frequency signal can be transmitted from the transmitting terminal TX of the radio frequency signal to the common terminal RFC of the radio frequency signal. When the power supply terminal Vdd of the radio frequency switch supplies power normally and the common terminal RFC of the radio frequency signal is conducted to the receiving terminal RX of the radio frequency signal, the radio frequency signal can be transmitted from the common terminal RFC of the radio frequency signal to the receiving terminal RX of the radio frequency signal. When the power supply end Vdd of the radio frequency switch fails, the radio frequency signal can still be transmitted from the radio frequency signal transmitting end TX to the radio frequency signal public end RFC. The problem that the whole radio frequency front end module cannot work normally when the power supply of the switch fails at present is solved.
Compared with the traditional single-pole double-throw switch, the radio frequency switch circuit of the application utilizes the combination of the transistor on and off equivalent circuit, the capacitor and the inductor to form a filter structure, so that the normal switching of a receiving and transmitting passage under normal power supply is realized, and the transmitting passage can still work normally under the condition of power supply failure. The switch circuit has the advantages of simple structure, stable performance and high integration level.
Although embodiments of the invention have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. Any case can be considered as the application extension of the invention if the capacitance and inductance are added on the radio frequency transmitting or receiving branch to perform filtering and matching functions, or the receiving path is normally operated in the power failure state, or the single-pole three-throw switch, the single-pole four-throw switch and the single-pole N-throw switch (N is more than or equal to 5) with the power-off protection function are realized by applying the technology. Therefore, the invention is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A single pole double throw switching circuit with power off protection, the switching circuit comprising:
the radio frequency signal transmitting end is used for transmitting or transmitting radio frequency signals to the radio frequency signal public end;
the radio frequency signal receiving end is connected with the radio frequency signal public end and is used for receiving the radio frequency signal sent by the radio frequency signal public end;
one end of the first filtering module is connected with the radio frequency signal transmitting end, the other end of the first filtering module is connected with the radio frequency signal public end and the second filtering module, and the first filtering module is grounded;
one end of the second filtering module is connected with the first filtering module and the radio frequency signal public end, the other end of the second filtering module is connected with the radio frequency signal receiving end, and the second filtering module is grounded;
the power supply end is respectively connected with the first filtering module and the second filtering module and is used for providing voltage for the switching circuit;
the voltage control end is respectively connected with the first filtering module and the second filtering module and is used for controlling the voltages of the first filtering module and the second filtering module;
the radio frequency signal public end is respectively connected with the first filtering module and the second filtering module and is used for transmitting the radio frequency signals;
when the voltage of the power supply end is not zero, the power supply end supplies power normally, the radio frequency signal transmitting end can transmit the radio frequency signal to the radio frequency signal public end through the first filtering module, and the radio frequency signal public end can transmit the radio frequency signal to the radio frequency signal receiving end through the second filtering module;
when the voltage of the power supply end is zero, the radio frequency signal transmitting end transmits the radio frequency signal to the radio frequency signal public end through the first filtering module; the second filtering module blocks the radio frequency signals from being transmitted from the radio frequency signal public end to the radio frequency signal receiving end.
2. The single pole double throw switch circuit with power down protection of claim 1, wherein the first filter module comprises a first inductor, a first capacitor, a first resistor, a third resistor, and a first transistor;
the grid electrode of the first transistor is connected with the voltage control end through the first resistor, the source electrode of the first transistor is connected with the radio frequency signal transmitting end through a fifth capacitor, the drain electrode of the first transistor is connected with the radio frequency signal common end through a fourth capacitor, the drain electrode of the first transistor is respectively connected with the power supply end and the second filtering module through the third resistor, and the drain electrode of the first transistor is grounded through the first capacitor;
one end of the first capacitor is grounded, and the other end of the first capacitor is connected with the drain electrode of the first transistor;
one end of the first inductor is connected with the source electrode of the first transistor and the fifth capacitor, and the other end of the first inductor is connected with one end, far away from the ground, of the first capacitor.
3. The single pole double throw switch circuit with power off protection of claim 2, wherein the second filter module comprises a second transistor, a second inductor, a second capacitor, a third capacitor, a second resistor, and a fourth resistor;
the grid electrode of the second transistor is connected with the voltage control end through the second resistor, the source electrode of the second transistor is connected with the radio frequency signal receiving end through a sixth capacitor, the drain electrode of the second transistor is respectively connected with the power supply end and the first filtering module through the fourth resistor, and the drain electrode of the second transistor is grounded through the second capacitor;
one end of the second inductor is connected with the radio frequency signal public end through the fourth capacitor, and the other end of the second inductor is connected with the source electrode of the second transistor;
one end of the second capacitor is connected with the drain electrode of the second transistor, and the other end of the second capacitor is grounded;
one end of the third capacitor is connected to the source electrode of the second transistor, and the other end of the third capacitor is grounded.
4. The circuit of claim 3, wherein one end of the fourth capacitor is connected to the common terminal of the rf signal, and the other end of the fourth capacitor is connected to the drain of the first transistor and one end of the second inductor away from the second transistor, respectively.
5. The circuit of claim 4, wherein one end of the fifth capacitor is connected to the rf signal transmitting terminal, and the other end of the fifth capacitor is connected to the source of the first transistor.
6. The circuit of claim 5, wherein one end of the sixth capacitor is connected to the rf signal receiving terminal, and the other end of the sixth capacitor is connected to the source of the second transistor.
7. The circuit of claim 6, wherein one end of the first resistor is connected to the voltage control terminal and the other end of the first resistor is connected to the gate of the first transistor.
8. The circuit of claim 7, wherein one end of the second resistor is connected to the voltage control terminal, and the other end of the second resistor is connected to the gate of the second transistor.
9. The single pole double throw switch circuit with power down protection according to claim 8, wherein one end of the third resistor is connected to the drain of the first transistor, and the other end of the third resistor is connected to the power supply terminal.
10. The single pole double throw switch circuit with power off protection according to claim 9, wherein one end of the fourth resistor is connected to the power supply terminal, and the other end of the fourth resistor is connected to the drain of the second transistor.
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| CN202311607921.XA CN117674893B (en) | 2023-11-28 | 2023-11-28 | Single-pole double-throw switch circuit with power-off protection function |
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| CN202311607921.XA CN117674893B (en) | 2023-11-28 | 2023-11-28 | Single-pole double-throw switch circuit with power-off protection function |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049016A (en) * | 2015-08-07 | 2015-11-11 | 康希通信科技（上海）有限公司 | Single-pole single-throw radio-frequency switch, and single-pole double-throw radio-frequency switch and single-pole multi-throw radio-frequency switch both composed of single-pole single-throw radio-frequency switch |
| CN114157280A (en) * | 2021-12-13 | 2022-03-08 | 南京中科微电子有限公司 | Single-pole double-throw radio frequency switch circuit |
| CN114584119A (en) * | 2022-03-04 | 2022-06-03 | 扬州万方科技股份有限公司 | Wireless communication system receiving and transmitting switch circuit with power-off protection |
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- 2023-11-28 CN CN202311607921.XA patent/CN117674893B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049016A (en) * | 2015-08-07 | 2015-11-11 | 康希通信科技（上海）有限公司 | Single-pole single-throw radio-frequency switch, and single-pole double-throw radio-frequency switch and single-pole multi-throw radio-frequency switch both composed of single-pole single-throw radio-frequency switch |
| CN114157280A (en) * | 2021-12-13 | 2022-03-08 | 南京中科微电子有限公司 | Single-pole double-throw radio frequency switch circuit |
| CN114584119A (en) * | 2022-03-04 | 2022-06-03 | 扬州万方科技股份有限公司 | Wireless communication system receiving and transmitting switch circuit with power-off protection |
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| CN117674893B (en) | 2024-05-17 |
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