CN213279650U - Radio frequency measuring equipment with radio frequency front end protection - Google Patents
Radio frequency measuring equipment with radio frequency front end protection Download PDFInfo
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- CN213279650U CN213279650U CN202022860637.1U CN202022860637U CN213279650U CN 213279650 U CN213279650 U CN 213279650U CN 202022860637 U CN202022860637 U CN 202022860637U CN 213279650 U CN213279650 U CN 213279650U
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Abstract
A radio frequency measuring device with radio frequency front end protection mainly comprises a power supply circuit, a front end protection circuit, a radio frequency switch and a signal processing circuit, wherein the power supply circuit is used for generating direct current required by the operation of the device; the front-end protection circuit is provided with an input channel and an output channel of radio frequency signals and is used for switching on the input channel and the output channel after the direct current is electrified and switching off the input channel and the output channel before the direct current is electrified; the radio frequency switch is used for introducing a radio frequency signal on the output channel and outputting the radio frequency signal when the radio frequency switch is conducted; the signal processing circuit is used for carrying out signal analysis processing on the radio-frequency signal output by the output channel. Because the front end protection circuit is arranged at the front end of the radio frequency switch, the power-up/power-down sequence of the direct current can adapt to the receiving requirement of the radio frequency switch on the radio frequency signal, and the radio frequency measurement equipment is protected from being damaged in the power-up/power-down process.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to radio frequency measuring equipment with radio frequency front end protection.
Background
Currently, wireless communication products based on radio frequency principles are also increasing in number at a very dramatic rate. The market size of radio frequency devices is expanding at a rapid pace, from cellular phones and wireless PDAs to WiFi enabled laptops, bluetooth headsets, radio frequency identity tags, wireless medical devices, and Zigbee sensors. To perform a comprehensive production test and improve the test productivity, a tester needs to access a radio frequency signal to a radio frequency measurement device (such as a spectrum analyzer, a vector signal analyzer, an oscilloscope, etc.) in order to perform a test operation.
The high-frequency radio frequency front-end switch chip usually has strict requirements on the power-on/power-off sequence of the chip, wherein the power-on sequence comprises the steps of firstly supplying a power supply and a control signal and then supplying a radio frequency input signal; the power-off sequence is that the radio frequency input signal is removed first, and then the power supply and the control signal are cut off. If the power up/down sequence is not satisfied, the on-chip integrated circuit may be damaged. The radio frequency measurement device is often subjected to some conditions in the use process, for example, a radio frequency signal is firstly connected to an input port of the radio frequency measurement device and then the measurement device is powered on and started up, and for example, the radio frequency signal is suddenly powered off due to an accident in the measurement process, the two conditions do not meet the power-on/power-off sequence requirement of a radio frequency broadband chip, and the chip is easily damaged.
In order to protect the rf front-end switch chip, the prior art has a mechanical digitally controlled attenuator arranged in front of the rf front-end switch chip to attenuate the rf input signal to a safe power level and then output the rf input signal to the rf front-end switch chip. This circuit configuration also presents problems, since the mechanically digitally controlled attenuator for the high frequency broadband is also very expensive, which greatly increases the application costs of the radio frequency measuring device.
Disclosure of Invention
The invention mainly solves the technical problems that: how to protect the rf measurement device from damage during power up/down. To solve the above problem, the present application provides a radio frequency measurement device with radio frequency front end protection, which includes:
the power supply circuit is used for generating direct current required by the operation of equipment; the front-end protection circuit is connected with the power supply circuit; the front-end protection circuit is provided with an input channel and an output channel of radio frequency signals and is used for switching on the input channel and the output channel after the direct current is electrified and switching off the input channel and the output channel before the direct current is electrified; the radio frequency switch is connected with the output channel of the front-end protection circuit, and is used for introducing the radio frequency signal on the output channel and outputting the radio frequency signal when the radio frequency switch is switched on; and the signal processing circuit is connected with the radio frequency switch and is used for carrying out signal analysis processing on the radio frequency signal output by the radio frequency switch.
The front end protection circuit includes: the voltage stabilizing output circuit is connected with the power supply circuit and is used for stabilizing and outputting the direct current when the voltage of the direct current is detected to exceed a preset threshold value; the radio frequency coaxial switch comprises a first input end, a first output end and a second output end, wherein the first input end is used for forming an input channel of the radio frequency signal, the first output end is used for forming an output channel of the radio frequency signal, and the second output end is used for forming a load channel of the radio frequency signal; the radio frequency coaxial switch is powered by the voltage stabilization output circuit in a direct current voltage stabilization mode, and is used for conducting a first input end and a first output end of the radio frequency coaxial switch to transfer the input channel to the output channel when the radio frequency coaxial switch is powered on, and conducting a first input end and a second output end of the radio frequency coaxial switch to transfer the input channel to the load channel when the radio frequency coaxial switch is powered off; the radio frequency switch comprises a second input end and a third output end, wherein the second input end is connected with the first output end, and the third output end is connected to the signal processing circuit; the radio frequency switch is used for conducting a second input end and a third output end of the radio frequency switch under the action of a control signal so as to transmit the introduced radio frequency signal to the signal processing circuit, or conducting a third input end and a third output end of the radio frequency switch so as to transmit the accessed calibration signal to the signal processing circuit.
The voltage stabilizing output circuit comprises a first linear voltage stabilizer, a power supply monitoring chip and an electronic switch; the first linear voltage stabilizer is connected with the power supply circuit and used for performing voltage stabilization conversion on the direct current and outputting a first-grade stabilized direct current; the power supply monitoring chip is connected with the power supply circuit and used for detecting the voltage of the direct current and outputting a trigger signal when the voltage of the direct current is greater than or equal to a preset threshold value; the electronic switch comprises a first pole, a second pole and a control pole, the first pole and the second pole are respectively connected with the first linear voltage stabilizer and the radio frequency coaxial switch, and the control pole is connected with the power supply monitoring chip; the electronic switch is used for conducting a first pole and a second pole of the electronic switch when a control pole of the electronic switch receives the trigger signal, so that the first-level voltage-stabilized direct current is supplied to the radio frequency coaxial switch, and disconnecting the first pole and the second pole of the electronic switch when a controller of the electronic switch does not receive the trigger signal.
The second output end of the radio frequency coaxial switch is connected with a broadband load, and a load channel is formed between the second output end of the radio frequency coaxial switch and the broadband load; the broadband load is a resistive component with high-frequency working characteristics.
The radio frequency measuring equipment further comprises a second linear voltage stabilizer; the second linear voltage stabilizer is connected with the power supply circuit and the radio frequency switch and used for performing voltage stabilization conversion on the direct current and outputting second-level stabilized direct current so that the radio frequency switch is electrified to work under the second-level stabilized direct current.
The radio frequency measuring equipment also comprises a control component; the control component is in signal connection with the radio frequency switch and the first linear voltage stabilizer, and is used for sending a control signal to the radio frequency switch and enabling the radio frequency switch to conduct a second input end and a third output end of the radio frequency switch, and sending an enabling signal to the first linear voltage stabilizer and enabling the first linear voltage stabilizer to enter a voltage stabilization conversion working state.
The signal processing circuit is provided with signal analysis processing including one or more of signal amplification, signal filtering, signal sampling, frequency transformation, time domain analysis, and frequency domain analysis.
The radio frequency measuring equipment comprises a power supply interface connected with the power supply circuit and a radio frequency interface connected with the front-end protection circuit; the power supply interface is used for accessing external city network alternating current; the radio frequency interface is used for accessing an external radio frequency signal.
The radio frequency measuring equipment also comprises a display; the display is connected with the signal processing circuit and used for displaying the result of the signal analysis processing of the radio frequency signal.
The invention has the beneficial effects that:
the radio frequency measuring equipment with the radio frequency front end protection mainly comprises a power supply circuit, a front end protection circuit, a radio frequency switch and a signal processing circuit, wherein the power supply circuit is used for generating direct current required by the equipment to work; the front-end protection circuit is provided with an input channel and an output channel of radio frequency signals and is used for switching on the input channel and the output channel after the direct current is electrified and switching off the input channel and the output channel before the direct current is electrified; the radio frequency switch is connected with an output channel of the front-end protection circuit and used for introducing a radio frequency signal on the output channel and outputting the radio frequency signal when the radio frequency switch is conducted; the signal processing circuit is used for carrying out signal analysis processing on the radio-frequency signal output by the output channel. On one hand, the front end protection circuit is arranged at the front end of the radio frequency switch, so that the power-up/power-down sequence of direct current can adapt to the receiving requirement of the radio frequency switch on radio frequency signals, and the radio frequency measurement equipment is protected from being damaged in the power-up/power-down process; on the other hand, the front-end protection circuit of the signal processing circuit has a simple circuit structure, adopts conventional components, can fully exert the performance of each component through ingenious circuit design, and compared with the traditional mechanical numerical control attenuator, the front-end protection circuit not only realizes the function of sequential adaptation of an up/down power process and a radio frequency signal output process, but also can effectively reduce the application cost of radio frequency measuring equipment.
Drawings
FIG. 1 is a schematic diagram of a radio frequency measurement device;
FIG. 2 is a circuit block diagram of a radio frequency measurement device;
fig. 3 is an external structural view of the radio frequency measuring apparatus.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, fig. 2 and fig. 3, the present application discloses a radio frequency measurement device, which mainly includes a power circuit 1, a front-end protection circuit 2, a radio frequency switch 3 and a signal processing circuit 4.
The power supply circuit 1 is the main power supply component of the radio frequency measuring device for generating the direct current required for the operation of the device. The power supply circuit 1 may be a switching power supply, so as to convert an externally input alternating current into a direct current required for the operation of the apparatus; of course, the power supply circuit 1 may also be a rectifier type power supply, so as to convert the electric energy of the storage battery into the direct current required for the operation of the device.
In order to meet the power consumption requirements of most components in the radio frequency measurement equipment, a switching power supply is preferably adopted as the power supply circuit 1, so that 220V of the commercial power grid alternating current is converted into 12V of direct current, and then the 12V direct current is subjected to voltage stabilization and conversion by means of other voltage stabilization devices.
The front-end protection circuit 2 is connected to the power supply circuit 1, and the front-end protection circuit 2 forms an input channel and an output channel of the radio frequency signal, then the front-end protection circuit 2 is used to turn on the input channel and the output channel after the completion of the power-on of the direct current and to turn off the input channel and the output channel before the completion of the power-off of the direct current. It can be understood that the front-end protection circuit 2 realizes sequential adjustment of direct current power-on/power-off and radio frequency signal output, and can not only complete power-on and then conduct a channel in the direct current power-on process, thereby introducing a radio frequency signal in a delay mode; the channel can be disconnected firstly and then the direct current is powered off, so that circuit components are protected in a mode of rapidly removing the radio frequency signal.
The radio frequency switch 3 has an input end and an output end, and the radio frequency switch 3 is connected with an output channel of the front-end protection circuit 2. The rf switch 3 is then used to introduce the rf signal on the output channel and output the rf signal when it is turned on (i.e. its input and output are turned on).
The signal processing circuit 4 is connected with the front-end protection circuit 2 and is used for analyzing and processing the radio-frequency signal output by the output channel. It will be appreciated that the signal processing circuit 4 may be an analog or digital circuit integrating filtering, sampling and numerical analysis functions, having a range of analysis processing capabilities on the received radio frequency signal.
In this embodiment, referring to fig. 2, the front-end protection circuit mainly includes a regulated output circuit 21 and a radio frequency coaxial switch 22.
The voltage stabilizing output circuit 21 is connected to the power supply circuit 1, and is configured to detect a voltage of the direct current generated by the power supply circuit 1, and perform voltage stabilizing output on the direct current when the voltage exceeds a preset threshold.
The rf coaxial switch 22 includes a first input 221, a first output 222, and a second output 223. The first input end 221 is used to form an input channel of the radio frequency signal, that is, the radio frequency signal can enter the radio frequency coaxial switch 22 from the first input end 221; the first output terminal 222 is used for forming an output channel of the rf signal, and the second output terminal 223 is used for forming a load channel of the rf signal. The rf coaxial switch 22 is further connected to the voltage-stabilizing output circuit 21, and the voltage-stabilizing output circuit 21 performs dc voltage-stabilizing power supply, so that the rf coaxial switch 22 is used to conduct the first input end 221 and the first output end 222 of the rf coaxial switch to switch the input channel to the output channel when power is supplied, and at this time, the rf signal is transmitted to the rf switch 3 through the first input end 221 and the first output end 222; and the radio frequency coaxial switch is used for conducting the first input end 221 and the second output end 223 of the radio frequency coaxial switch to switch the input channel to the load channel when the power is off, and then the radio frequency signal is transmitted to a load device through the first input end 221 and the second output end 223.
In one embodiment, the second output terminal 223 of the rf coaxial switch 22 is connected to the broadband load 24, and forms a load path with the broadband load 24. The bandwidth load 24 may be a resistive component with high frequency operation characteristic, and is used to provide a matching load with a certain ohm value, for example, a bandwidth load of 50 Ω, to the external device under test when the rf coaxial switch 22 is not powered.
It should be noted that the radio frequency coaxial switch 22 needs to adopt a non-self-holding type radio frequency coaxial switch, and has a function of switching different radio frequency channels, and is used for protecting the radio frequency switch 3 of the device. The rf coaxial switch 22 is characterized in that, when the power is off, the first input 221 of the rf signal is conducted to the broadband load 24; when power is supplied, the first input port 221 of the rf signal is connected to the rf switch 3.
In the present embodiment, referring to fig. 2, the radio frequency switch 3 includes a second input terminal 31, a third input terminal 32 and a third output terminal 33. The second input terminal 31 is connected to the first output terminal 222 of the rf coaxial switch 222, the third input terminal 32 is used for receiving the calibration signal, and the third output terminal 33 is connected to the signal processing circuit 4. The rf switch 3 is then used to switch on its own second input terminal 31 and third output terminal 33 under the action of a control signal to transmit the incoming rf signal to the signal processing circuit 4, or switch on its own third input terminal 32 and third output terminal 33 under the action of another control signal to transmit the incoming calibration signal to the signal processing circuit 4.
It should be noted that the rf switch 3 may be referred to as a microwave switch, and mainly implements a function of controlling the switching of the rf signal or microwave signal channel. In this embodiment, the rf switch 3 is used to switch between the rf signal input port and the calibration signal.
It should be noted that the calibration signal input from the third input terminal 32 is information generated inside the apparatus, and is mainly used for calibrating gain fluctuation caused by temperature change.
In one embodiment, referring to fig. 2, the regulated output circuit 21 specifically includes a first linear regulator 211, a power supply monitoring chip 212, and an electronic switch 213.
The first linear regulator 211 is connected to the power circuit 1, and performs voltage-stabilizing conversion on the dc power generated by the power circuit 1, and outputs a first-level stabilized dc power (e.g., outputs 11V stabilized dc power).
The power monitoring chip 212 is connected to the power circuit 1, and is configured to detect a voltage of the direct current generated by the power circuit 1, and output a trigger signal when the voltage of the direct current is greater than or equal to a preset threshold (e.g., 10.5V).
The electronic switch 213 includes a first pole, a second pole and a control pole (not labeled in fig. 2), wherein the first pole and the second pole are respectively connected to the first linear regulator 211 and the rf coaxial switch 22, and the control pole is connected to the power monitoring chip 212. Then, the electronic switch 213 is configured to turn on the first pole and the second pole when the control pole of the electronic switch receives the trigger signal, so that the first stage of the regulated dc power is supplied to the rf coaxial switch.
It should be noted that, if a CCR-53S module from TELEDYNE is used as the rf coaxial switch 22, and the requirement that the power supply voltage of the module is 11V needs to be adapted, a switching power supply with 12V dc output may be selected as the power supply circuit 1, an LDO linear regulator device from 12V to 11V may be selected as the first linear regulator 211, and TPS3803-01 from TI may be selected as the power supply monitoring chip 212, and a thyristor with a suitable withstand voltage range may be selected as the electronic switch 213. Then, the power supply monitoring chip 212 detects the output dc voltage of the power supply circuit 1 in real time, and sends a low level to the electronic switch 213 when the dc voltage is lower than the preset threshold value of 10.5V; when the dc voltage is higher than the preset threshold value of 10.5V, a high level (i.e., a trigger signal) is transmitted to the electronic switch 213. Since the detection accuracy and slew rate of the power supply monitor chip 212 are very high, the time taken from detecting the voltage to the output level is very short (typically in the order of ns), so that the electronic switch 213 can be controlled quickly.
In one embodiment, referring to fig. 2, the radio frequency measurement device further comprises a second linear regulator 5, the second linear regulator 5 being connected to the power supply circuit 1 and the radio frequency switch 3. Then, the second linear regulator 5 is configured to perform voltage stabilization conversion on the dc power generated by the power supply circuit 1, and output a second level of stabilized dc power (for example, output 5V of stabilized dc power), so that the rf switch 3 operates under the second level of stabilized dc power.
It should be noted that if the ADRF5021 module of ADI company is adopted as the RF switch 3, the requirement that the supply voltage of the module is 5V needs to be adapted, and then an LDO linear regulator device with 12V to 5V can be selected as the second linear regulator 5.
In one embodiment, in order to enable the rf switch 3 to switch between the second input terminal 31 and the third input terminal 32, the rf measurement device may be configured with a control unit 6, see fig. 2, the control unit 6 being in signal connection with the rf switch 3 and the first linear regulator 211. Then, the control unit 6 is configured to send a control signal to the rf switch 3 and make the rf switch 3 turn on its second input terminal 31 and third output terminal 33, so as to lead the rf signal output by the rf coaxial switch 22 to the signal processing circuit 4; and the control section 6 sends an enable signal to the first linear regulator 211 and brings the first linear regulator 211 into an operating state of voltage stabilization conversion.
In one embodiment, referring to fig. 1 and fig. 2, the signal analysis processing provided by the signal processing circuit 4 includes one or more of signal amplification, signal filtering, signal sampling, frequency transformation, time domain analysis, and frequency domain analysis, which is not limited in particular. In addition, the specific circuit structure and implementation function of the signal processing circuit 4 can refer to devices such as a spectrum analyzer, a vector signal analyzer, an oscilloscope, etc., and since it belongs to the prior art to perform the signal analysis function of the radio frequency signal, it is not further described here.
In one embodiment, referring to fig. 1 and 3, the rf measurement device has a housing provided with a power supply interface 71 for connection to the power supply circuit 1 and an rf interface 72 for connection to the front-end protection circuit 2. Then, the power supply interface 71 is used for accessing external mains ac power, and the power supply circuit 1 performs dc conversion on the mains ac power; the rf interface 72 may employ a conventional coaxial connector to access external rf signals by inserting a male/female connector of a coaxial cable.
Further, referring to fig. 1 and 3, a display 73 is further provided on the housing of the rf measurement device, and the display 73 is used for connecting with the signal processing circuit 4 and displaying the result of the signal analysis processing of the rf signal. Such as information indicating the waveform, period, frequency, amplitude, etc. of the rf signal.
Further, referring to fig. 2 and 3, a casing of the radio frequency measurement device is further provided with a key type input component 42, so as to realize the operation input of the user.
In this embodiment, the front-end protection circuit 2 has a simple circuit structure, wherein conventional components are adopted, but the performance of each component can be fully exerted through ingenious circuit design, and compared with the traditional mechanical numerical control attenuator, the function of sequential adaptation of the power-on/power-off process and the radio-frequency signal output process is realized, and the application cost of the radio-frequency measurement equipment can be effectively reduced.
In order to better understand the technical solution of the present application, the working principle of the technical solution will be described in detail with reference to fig. 2.
In case one, power-on protection is implemented for the device. The key of the power-on protection is to ensure that the rf coaxial switch 22 is not powered before the rf switch 3 is powered on, so that the rf signal does not enter the second input terminal 31 of the rf switch 22. When the power circuit 1 is connected to the 220V mains ac, the voltage of the generated dc is gradually increased under the influence of the inductive and capacitive devices inside the power circuit 1, the power monitoring chip 212 monitors the dc voltage in real time, and when the dc voltage is higher than a preset threshold (e.g. 10.5V), the power monitoring chip 212 outputs a trigger signal to control the electronic switch 213 to be turned on. Since the first linear regulator 211 is not enabled, the first linear regulator 211 is still in the off state, there is no stable dc output, and the rf coaxial switch 22 is in the off state, so that the rf signal is transmitted to the wideband load 24 through the first input terminal 211 and the second output terminal 223. The second linear regulator 5 performs voltage-stabilizing conversion on the direct current generated by the power supply circuit 1, and outputs a second level of stabilized direct current (for example, 5V), thereby completing the power-on of the radio frequency switch 3. Usually, when the control unit 6 is started and in a normal working state, the power-on action of the rf switch 3 is completed, so that the control unit 6 can send a control signal to the rf switch 3 to turn on the second input terminal 31 and the third output terminal 33; after a short time delay (ensuring that the rf switch 6 is turned on), the control unit 6 may send an enable signal to the first linear regulator 211, so as to enable the first linear regulator 211 to output a first level of regulated dc power (e.g., 11V), and supply power to the rf coaxial switch 222 through the electronic switch 213, so as to turn on the first input terminal 221 and the first output terminal 222, and further enable the rf signal sent by the device under test to be transmitted to the signal processing circuit 4 through the first input terminal 221, the second output terminal 222, the second input terminal 31, and the third output terminal 33. In the direct current power-on process, direct current power supply to the radio frequency switch 3 is completed firstly, then a control signal is sent to the radio frequency switch 3, an enabling signal is sent to the first linear voltage stabilizer 211, and then the radio frequency signal is introduced into the radio frequency switch 3, so that the power-on sequence of the direct current can adapt to the receiving requirement of the radio frequency switch on the radio frequency signal, and the radio frequency measuring equipment is protected from being damaged in the power-on process.
And in the second situation, the power-off protection is implemented on the equipment. The key of the power-off protection is to ensure that the radio frequency coaxial switch 22 is powered off before the radio frequency switch 3 is powered off, so that a channel for transmitting a radio frequency signal to the radio frequency switch is cut off rapidly. When an unexpected power failure occurs, the commercial ac power connected to the power circuit 1 is first disconnected, the voltage of the generated dc power is gradually decreased under the influence of the inductive and capacitive devices inside the power circuit 1, the power monitoring chip 212 monitors the dc voltage in real time, and when the dc voltage is lower than a preset threshold voltage (e.g., 10.5V, although the preset threshold may also be 10.8V), the power monitoring chip 212 outputs a low level (i.e., stops outputting the trigger signal), and controls the electronic switch 213 to be rapidly disconnected. As the rf coaxial switch 222 loses power supply, the first input 221 and the second output 223 of the rf coaxial switch 222 will be turned on, so as to cut off the rf signal input to the rf switch 3 and transmit the rf signal to the broadband load 24. Because the control response of the power supply monitoring chip 212 is very fast, when the power supply of the rf coaxial switch 22 is cut off, the dc power output by the power supply circuit 1 is still within the working range of the second linear regulator 5, and the rf switch 3 is still in normal operation, and gradually loses power supply after a period of time. In the direct current power-off process, a channel for transmitting the radio-frequency signal to the radio-frequency switch 3 is cut off, and then the radio-frequency switch 3 is powered off, so that the power-off sequence of the direct current can meet the receiving requirement of the radio-frequency switch on the radio-frequency signal, and the radio-frequency measuring equipment is protected from being damaged in the power-off process.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A radio frequency measurement device, comprising:
the power supply circuit is used for generating direct current required by the operation of equipment;
the front-end protection circuit is connected with the power supply circuit; the front-end protection circuit is provided with an input channel and an output channel of radio frequency signals and is used for switching on the input channel and the output channel after the direct current is electrified and switching off the input channel and the output channel before the direct current is electrified;
the radio frequency switch is connected with the output channel of the front-end protection circuit, and is used for introducing the radio frequency signal on the output channel and outputting the radio frequency signal when the radio frequency switch is switched on;
and the signal processing circuit is connected with the radio frequency switch and is used for carrying out signal analysis processing on the radio frequency signal output by the radio frequency switch.
2. The radio frequency measurement device of claim 1, wherein the front end protection circuit comprises:
the voltage stabilizing output circuit is connected with the power supply circuit and is used for stabilizing and outputting the direct current when the voltage of the direct current is detected to exceed a preset threshold value;
the radio frequency coaxial switch comprises a first input end, a first output end and a second output end, wherein the first input end is used for forming an input channel of the radio frequency signal, the first output end is used for forming an output channel of the radio frequency signal, and the second output end is used for forming a load channel of the radio frequency signal; the radio frequency coaxial switch is powered by the voltage stabilization output circuit in a direct current voltage stabilization mode, and is used for conducting a first input end and a first output end of the radio frequency coaxial switch to transfer the input channel to the output channel when the radio frequency coaxial switch is powered on, and conducting a first input end and a second output end of the radio frequency coaxial switch to transfer the input channel to the load channel when the radio frequency coaxial switch is powered off.
3. The radio frequency measurement device of claim 2, wherein the radio frequency switch includes a second input terminal and a third output terminal, wherein the second input terminal is connected to the first output terminal, and the third output terminal is connected to the signal processing circuit; the radio frequency switch is used for conducting a second input end and a third output end of the radio frequency switch under the action of a control signal so as to transmit the introduced radio frequency signal to the signal processing circuit.
4. The radio frequency measurement device of claim 2, wherein the regulated output circuit includes a first linear regulator, a power supply monitoring chip, and an electronic switch;
the first linear voltage stabilizer is connected with the power supply circuit and used for performing voltage stabilization conversion on the direct current and outputting a first-grade stabilized direct current;
the power supply monitoring chip is connected with the power supply circuit and used for detecting the voltage of the direct current and outputting a trigger signal when the voltage of the direct current is greater than or equal to a preset threshold value;
the electronic switch comprises a first pole, a second pole and a control pole, the first pole and the second pole are respectively connected with the first linear voltage stabilizer and the radio frequency coaxial switch, and the control pole is connected with the power supply monitoring chip; the electronic switch is used for conducting a first pole and a second pole of the electronic switch when a control pole of the electronic switch receives the trigger signal, so that the first-level voltage-stabilized direct current is supplied to the radio frequency coaxial switch, and disconnecting the first pole and the second pole of the electronic switch when a controller of the electronic switch does not receive the trigger signal.
5. The radio frequency measurement device according to claim 2, wherein a broadband load is connected to the second output terminal of the radio frequency coaxial switch, and the load channel is formed between the second output terminal of the radio frequency coaxial switch and the broadband load; the broadband load is a resistive component with high-frequency working characteristics.
6. The radio frequency measurement device of claim 3, further comprising a second linear regulator; the second linear voltage stabilizer is connected with the power supply circuit and the radio frequency switch and used for performing voltage stabilization conversion on the direct current and outputting second-level stabilized direct current so that the radio frequency switch is electrified to work under the second-level stabilized direct current.
7. The radio frequency measurement device of claim 4, further comprising a control component; the control component is in signal connection with the radio frequency switch and the first linear voltage stabilizer, and is used for sending a control signal to the radio frequency switch and enabling the radio frequency switch to conduct a second input end and a third output end of the radio frequency switch, and sending an enabling signal to the first linear voltage stabilizer and enabling the first linear voltage stabilizer to enter a voltage stabilization conversion working state.
8. The radio frequency measurement device of any one of claims 1-7, wherein the signal processing circuitry is provided with signal analysis processing including one or more of signal amplification, signal filtering, signal sampling, frequency transformation, time domain analysis, frequency domain analysis.
9. The radio frequency measurement device according to any one of claims 1 to 7, comprising a power supply interface connected to the power supply circuit, and a radio frequency interface connected to the front end protection circuit;
the power supply interface is used for accessing external city network alternating current;
the radio frequency interface is used for accessing an external radio frequency signal.
10. The radio frequency measurement device of claim 9, further comprising a display; the display is connected with the signal processing circuit and used for displaying the result of the signal analysis processing of the radio frequency signal.
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| CN202022860637.1U CN213279650U (en) | 2020-12-02 | 2020-12-02 | Radio frequency measuring equipment with radio frequency front end protection |
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| CN202022860637.1U CN213279650U (en) | 2020-12-02 | 2020-12-02 | Radio frequency measuring equipment with radio frequency front end protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114295965A (en) * | 2022-01-06 | 2022-04-08 | 上海御渡半导体科技有限公司 | Power-on and power-off method of programmable device power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295965A (en) * | 2022-01-06 | 2022-04-08 | 上海御渡半导体科技有限公司 | Power-on and power-off method of programmable device power supply |
| CN114295965B (en) * | 2022-01-06 | 2024-01-16 | 上海御渡半导体科技有限公司 | Power-on and power-off method for programmable device power supply |
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