CN113258951B - WiFi circuit, wiFi module and WiFi debugging method - Google Patents
WiFi circuit, wiFi module and WiFi debugging method Download PDFInfo
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- CN113258951B CN113258951B CN202110472641.7A CN202110472641A CN113258951B CN 113258951 B CN113258951 B CN 113258951B CN 202110472641 A CN202110472641 A CN 202110472641A CN 113258951 B CN113258951 B CN 113258951B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
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Abstract
A WiFi circuit, a WiFi module and a WiFi debugging method are disclosed, wherein the WiFi circuit adopts a control circuit, a sending channel, a receiving channel and a switching connection circuit, a first radio frequency signal is subjected to differential single-ended conversion through the sending channel, and then power amplification is carried out to obtain a first target radio frequency signal, so that the transmitting power of the WiFi circuit is improved; the second radio frequency signal is filtered and amplified into a second target radio frequency signal through the receiving channel, so that the receiving sensitivity of the receiving channel is improved; and the output impedance is matched with the antenna impedance of the antenna by setting the output impedance of the sending channel, and the input impedance of the receiving channel is set to be matched with the antenna impedance, so that the transmission power and the receiving sensitivity of the WiFi circuit are improved, and the problems of small signal coverage and small receiving range in the existing WiFi circuit are solved.
Description
Technical Field
The application belongs to the technical field of WiFi, and particularly relates to a WiFi circuit, a WiFi module and a WiFi debugging method.
Background
At present, a Wireless-Fidelity (WiFi) network of a vehicle-mounted security device is generally used to complete maintenance work such as uploading local video recording data to a yard management center by a vehicle-mounted host, downloading and upgrading vehicle-mounted software, and the like after a vehicle returns to the yard. Because the vehicle is in an operation state in daily life, uploading of videos can only be carried out in different time periods, the amount of video data needing to be uploaded at each time is large, meanwhile, the environment complexity of different parking lots is different, if the area of a parking lot is large, an isolation wall body exists in a certain parking lot area, signal coverage of WiFi is caused to have a blind area, inconvenience and poor experience are brought to use of vehicle-mounted equipment, and therefore urgent practical requirements are brought to high-power WIFI in the vehicle-mounted industry at the present stage.
At present, two methods for solving the problem mainly exist, namely, the vehicle is artificially made to enter a WiFi signal good area in a parking lot; and secondly, upgrading the WiFi performance of the vehicle-mounted host, and if a module supporting the MIMO multi-antenna technology is adopted, increasing the omni-directionality of WiFi signals to relieve the influence caused by coverage blind areas.
The practical improvement effects of the two methods are very limited, because they can not improve the transmitting power and receiving sensitivity of the WiFi front-end module fundamentally, the coverage and receiving range of signals can not be effectively improved, and some disadvantages are brought, for example, the daily maintenance workload of a parking lot is increased in the first mode, the substantial improvement level of the signal coverage range is very limited due to the fact that the multi-antenna new module adopted in the second mode is still limited by the power of 20dBm in the national standard, and the equipment cost and the software development period are additionally increased.
Therefore, the current WiFi circuit has the problems of small signal coverage and small receiving range.
Disclosure of Invention
The application aims to provide a WiFi circuit, a WiFi module and a WiFi debugging method, and aims to solve the problems that the coverage range of signals is small and the receiving range is small in the current WiFi circuit.
A first aspect of an embodiment of the present application provides a WiFi circuit, connected to an antenna, the WiFi circuit including:
a control circuit;
the transmitting channel is connected with the control circuit and used for carrying out differential single-ended conversion and power amplification processing on a first radio frequency signal under the control of the control circuit, outputting the first radio frequency signal as a first target radio frequency signal and outputting the first target radio frequency signal to the antenna;
the receiving channel is connected with the control circuit and used for filtering and amplifying the accessed second radio frequency signal under the control of the control circuit and outputting the second radio frequency signal as a second target radio frequency signal; and
a switch connection circuit connected to the transmission channel, the reception channel, and the antenna, the switch connection circuit configured to switch the transmission channel and the reception channel to the antenna, and set an output impedance of the transmission channel so that the output impedance matches an antenna impedance of the antenna, and set an input impedance of the reception channel so that the input impedance matches the antenna impedance;
wherein the transmission channel and the reception channel each include a conversion unit;
the conversion unit is used for mutual conversion of a differential radio frequency signal and a single-ended radio frequency signal, a first input/output end of the conversion unit is connected with the control circuit and used for accessing or outputting the differential radio frequency signal, and a second input/output end of the conversion unit is connected with the matched filter circuit and used for accessing or outputting the single-ended radio frequency signal;
the conversion unit comprises a fifth capacitor, a sixth capacitor, a seventh capacitor, a third inductor and a fourth inductor, wherein the first end of the fifth capacitor, the first end of the third inductor and the first end of the sixth inductor are connected to the first end of the control circuit in a common manner, the second end of the fifth capacitor, the first end of the seventh capacitor and the first end of the fourth inductor are connected to the second end of the control circuit in a common manner, the second end of the third inductor is grounded, the second end of the seventh capacitor is grounded, and the second end of the sixth capacitor and the second end of the fourth inductor are connected to the matched filter circuit in a common manner.
A second aspect of the embodiments of the present application provides a WiFi module, including:
a WiFi circuit as described in the first aspect of the embodiments of the present application;
an antenna connected to the WiFi circuit; and
and the power supply circuit is used for supplying power to the WiFi circuit.
A third aspect of the embodiments of the present application provides a WiFi debugging method, where the WiFi debugging method is applied to a WiFi circuit according to the first aspect of the embodiments of the present application, and the WiFi debugging method includes:
determining the type selection of a control circuit and the form of a direct current bias network thereof according to the design requirement of the target WiFi;
performing circuit tuning on the transmission channel to match a line impedance of the transmission channel with an impedance of the antenna;
performing circuit tuning on the receiving channel to match a line impedance of the receiving channel with an impedance of the antenna;
and calibrating the power of the WiFi circuit.
According to the WiFi circuit, the WiFi module and the WiFi debugging method, the WiFi circuit adopts the control circuit, the sending channel, the receiving channel and the switching connection circuit, the power of the first radio-frequency signal is amplified into the first target radio-frequency signal through the sending channel, and the transmitting power of the WiFi circuit is improved; the second radio frequency signal is filtered and amplified into a second target radio frequency signal through the receiving channel, so that the receiving sensitivity of the receiving channel is improved; and the output impedance is matched with the antenna impedance of the antenna by setting the output impedance of the sending channel, and the input impedance of the receiving channel is set to be matched with the antenna impedance, so that the transmission power and the receiving sensitivity of the WiFi circuit are improved, and the problems of small signal coverage and small receiving range in the current WiFi circuit are solved.
Drawings
Fig. 1 is a schematic circuit diagram of a WiFi circuit according to an embodiment of the present application;
FIG. 2 is a detailed circuit diagram of each circuit in the WiFi circuit shown in FIG. 1;
FIG. 3 is an exemplary schematic circuit diagram of a portion of the circuitry in the WiFi circuit of FIG. 2;
FIG. 4 is an exemplary circuit schematic of a power impedance circuit of the WiFi circuit shown in FIG. 2;
FIG. 5 is an exemplary schematic circuit diagram of a portion of the circuitry in the WiFi circuit of FIG. 2;
FIG. 6 is an exemplary circuit schematic of an input matched filter circuit in the WiFi circuit shown in FIG. 2;
FIG. 7 is an exemplary circuit schematic of an antenna matched filter circuit of the WiFi circuit of FIG. 2;
fig. 8 is an exemplary circuit schematic diagram of a power circuit of a WiFi module according to an embodiment of the present disclosure;
fig. 9 is a detailed flowchart of a WiFi debugging method according to an embodiment of the present application;
fig. 10 is a detailed flowchart of step S200 of the WiFi debugging method shown in fig. 9;
fig. 11 is a detailed flowchart of step S300 of the WiFi debugging method shown in fig. 9.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a schematic structural diagram of a WiFi circuit 10 provided in a first aspect of an embodiment of the present application, and for convenience of description, only parts related to the embodiment are shown, which are detailed as follows:
the WiFi circuit 10 in this embodiment is connected to the antenna 20, and the WiFi circuit 10 includes: the antenna comprises a control circuit 100, a transmission channel 200, a reception channel 300 and a switching connection circuit 400, wherein a first output end of the control circuit 100 is connected with an input end of the transmission channel 200, a first input end of the control circuit 100 is connected with an output end of the reception channel 300, an output end of the transmission channel 200 is connected with an antenna 20 through the switching connection circuit 400, and the antenna 20 is connected with an input end of the reception channel 300 through the switching connection circuit 400. The transmission channel 200 is configured to perform differential single-ended conversion and power amplification on the first radio frequency signal under the control of the control circuit 100, output the first radio frequency signal as a first target radio frequency signal, and output the first target radio frequency signal to the antenna 20; the receiving channel 300 is configured to, under the control of the control circuit 100, perform filtering amplification processing on the accessed second radio frequency signal, and output the second radio frequency signal as a second target radio frequency signal; the switch connection circuit 400 is used to set the output impedance of the transmission channel 200 so that it matches the antenna impedance of the antenna 20, and to set the input impedance of the reception channel 300 so that it matches the antenna impedance.
Wherein, the transmission channel 200 and the reception channel 300 each include a conversion unit;
the conversion unit is used for mutual conversion of the differential radio-frequency signal and the single-ended radio-frequency signal, a first input/output end of the conversion unit is connected with the control circuit 100 and used for accessing or outputting the differential radio-frequency signal, and a second input/output end of the conversion unit is connected with the matched filter circuit and used for accessing or outputting the single-ended radio-frequency signal;
the conversion unit comprises a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a third inductor L3 and a fourth inductor L4, wherein the first end of the fifth capacitor C5, the first end of the third inductor L3 and the first end of the sixth capacitor C6 are connected to the first end of the control circuit in a common way, the second end of the fifth capacitor C5, the first end of the seventh capacitor C7 and the first end of the fourth inductor L4 are connected to the second end of the control circuit in a common way, the second end of the third inductor L3 is grounded, the second end of the seventh capacitor C7 is grounded, and the second end of the sixth capacitor C6 and the second end of the fourth inductor L4 are connected to the matching filter circuit in a common way;
the conversion unit includes a balance-unbalance conversion circuit 220 and an unbalance-balance conversion circuit 340, and the matched filter circuit includes a first matched filter circuit 230 and an output matched filter circuit 330.
It is understood that the control circuit 100 in this embodiment is formed by a wireless local area network controller, and in other embodiments, the control circuit 100 may also be formed by other systems on chip with a radio frequency front end controller integrated therein. The transmission channel 200 may be formed of a signal conversion circuit, a radio frequency power amplifier, and a matched filter network. The receive channel 300 may be comprised of a signal conversion circuit, a low noise amplifier, and a matched filter network. The switching connection circuit 400 may be formed of a multiplexer, a matched filter network, or the like.
It is understood that the control circuit 100 may be configured to interconnect with an external device through a baseband signal, perform modulation and demodulation between the baseband signal and a radio frequency signal (specifically, the control circuit 100 may modulate a first baseband signal output by the external device into a first radio frequency signal, demodulate a second target radio frequency signal into a second baseband signal, and output the second baseband signal to the external device), generate a local oscillator, control on and off of the transmission channel 200 and the reception channel 300, and control gating of the switching connection circuit 400. The external device may be a System-on-Chip (SOC).
It is understood that differential to single-ended conversion converts a signal from a differential to a single-ended form, and single-ended to differential conversion converts a signal from a single-ended to a differential form.
It is understood that the WiFi circuit 10 in the embodiment of the present application may be a high power WiFi circuit with a power of more than 25 dBm.
In the WiFi circuit 10 in this embodiment, the control circuit 100, the transmission channel 200, the reception channel 300, and the switching connection circuit 400 are adopted, and the first radio frequency signal power is amplified to the first target radio frequency signal through the transmission channel 200, so that the transmission power of the WiFi circuit 10 is improved, and the signal coverage of the WiFi circuit 10 is wider; the second radio frequency signal is filtered and amplified to be a second target radio frequency signal through the receiving channel 300, so that the receiving sensitivity of the receiving channel 300 is improved, and the receiving range of the WiFi circuit 10 is wider; and the output impedance is matched with the antenna impedance of the antenna 20 by setting the output impedance of the transmission channel 200, and the input impedance is matched with the antenna impedance by setting the input impedance of the reception channel 300, so that the transmission power and the reception sensitivity of the WiFi circuit 10 are improved, and the problems of small signal coverage and small reception range in the current WiFi circuit are solved.
Referring to fig. 2, in one embodiment, a transmission channel 200 includes: the input end of the balance-unbalance conversion circuit 220 is connected with the control circuit 100, the first direct current bias circuit 210 is connected with the control circuit 100 and the balance-unbalance conversion circuit 220, the input end of the first matched filter circuit 230 is connected with the balance-unbalance conversion circuit 220, the input end of the power amplification circuit 240 is connected with the output end of the first matched filter circuit 230, the output end of the power amplification circuit 240 is connected with the input end of the power impedance circuit 250, and the output end of the power impedance circuit 250 is connected with the switching connection circuit 400. The balun circuit 220 is configured to access the first radio frequency signal output by the control circuit 100, and convert the first radio frequency signal into a first single-ended radio frequency signal in a differential single-ended manner; the first dc bias circuit 210 is configured to provide a dc bias voltage to a connection port of the control circuit 100 connected to the balun circuit 220, and the first matching filter circuit 230 is configured to match an input impedance of the power amplifier circuit 240, filter a high-frequency noise of the first single-ended radio frequency signal, and output the high-frequency noise as a filtered radio frequency signal; the power impedance circuit 250 is used for performing maximum power load point impedance matching on the power amplifying circuit 240; the power amplifier circuit 240 amplifies the filtered rf signal into a first target rf signal based on the impedance matching of the power impedance circuit 250, and outputs the first target rf signal to the switching connection circuit 400.
It is understood that the first dc bias circuit 210 may be formed of discrete devices such as inductors and capacitors. The balun circuit 220 may be formed of a balun or a differential-to-single-ended circuit formed of an inductor and a capacitor. The first matched filter circuit 230 is formed of a low-pass type matched filter circuit. The power amplifying circuit 240 may be formed of a radio frequency power amplifier. The power impedance circuit 250 may be formed of a low pass type matching filter network composed of an inductor and a capacitor.
It is understood that the connection port of the control circuit 100 to the balun circuit 220 may be an output port of a transmit driver of the control circuit 100.
It is understood that, between the first dc bias circuit 210 and the balun circuit 220, dc isolation is required, and a dc blocking capacitor may be connected.
Alternatively, in other embodiments, when the control circuit 100 is formed by a lan controller that can directly output a single-ended signal, the transmission channel 200 may not include the balun circuit 220, and the first rf signal is directly transmitted to the first matched filter circuit 230 in a state of a single-ended signal.
It is understood that the first dc bias circuit 210 may be integrated in the control circuit 100, or may be separately disposed outside the control circuit 100. For example, when the control circuit 100 is implemented by integrating a dc bias circuit into a connection port of a lan controller, the transmission channel 200 may not include the first dc bias circuit 210.
In the transmission channel 200 in this embodiment, the balance-unbalance conversion circuit 220, the first dc bias circuit 210, the first matched filter circuit 230, the power amplification circuit 240, and the power impedance circuit 250 are used to amplify the first radio frequency signal power to the first target radio frequency signal, and the first matched filter circuit 230 and the switching connection circuit 400 are used to match the line impedance of the transmission channel 200 with the antenna impedance, so as to ensure that the signal with the maximum power can be transmitted to the antenna 20, thereby improving the coverage of the signal.
Optionally, referring to fig. 3, in an embodiment, the first dc bias circuit 210 includes: the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the first inductor L1 and the second inductor L2, the first end of the first capacitor C1 and the first end of the first inductor L1 are commonly connected to the first output end of the control circuit 100, the first end of the second capacitor C2 and the first end of the second inductor L2 are commonly connected to the second output end of the control circuit 100, the second end of the first inductor L1 and the first end of the third capacitor C3 are commonly connected to the first end of the bias power supply, the second end of the third capacitor C3 is grounded, the second end of the second inductor L2 and the first end of the fourth capacitor C4 are commonly connected to the second end of the bias power supply, the second end of the fourth capacitor C4 is grounded, and the second ends of the first capacitor C1 and the second capacitor C2 are respectively connected to the balance-unbalance conversion circuit 220.
Optionally, the first inductance L1 and the second inductance L2 of the first dc bias circuit 210 of this embodiment are choke inductors, for example, the first inductance L1 and the second inductance L2 may be chip stacked inductors with inductance values between 12nH and 18 nH.
Optionally, referring to fig. 3, in an embodiment, the balun circuit 220 includes:
a first end of the fifth capacitor C5, a first end of the third inductor L3, and a first end of the sixth capacitor C6 are connected to the first end of the first dc bias circuit 210 in common, a second end of the fifth capacitor C5, a first end of the seventh capacitor C7, and a first end of the fourth inductor L4 are connected to the second end of the first dc bias circuit 210 in common, a second end of the third inductor L3 is grounded, a second end of the seventh capacitor C7 is grounded, and a second end of the sixth capacitor C6 and a second end of the fourth inductor L4 are connected to the first matched filter circuit 230 in common.
Alternatively, the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 in this embodiment may be chip-stacked high-frequency capacitors. For example, for the design of the 2.4GHz band, the inductance values of the third inductor L3 and the fourth inductor L4 may be 2.6nH to 2.8nH, and the capacitance values of the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 may be 1.1pF to 1.3pF, so as to avoid causing a high-Q narrowband problem; when the design is based on other frequency bands, the values of the inductor and the capacitor can be adjusted correspondingly.
Optionally, referring to fig. 3, in an embodiment, the first matched filter circuit 230 includes: a fifth inductor L5, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, and a capacitor CZ1, wherein a first end of the fifth inductor L5 and a first end of the eighth capacitor C8 are commonly connected to the output terminal of the balun circuit 220, a second end of the eighth capacitor C8 is grounded, a second end of the fifth inductor L5 is connected to a first end of the ninth capacitor C9 and a first end of the capacitor CZ1, a second end of the capacitor CZ1 is connected to the input terminal of the power amplification circuit 240, and a second end of the ninth capacitor C9 is connected to ground through the tenth capacitor C10.
It is understood that the capacitance CZ1 is a dc blocking capacitor. Optionally, for the design of a 2.4GHz band, the capacitance value of the capacitor CZ1 may be 20pF-24pF; when the design is based on other frequency bands, the value of the capacitor CZ1 can be adjusted correspondingly.
It is understood that the power amplifier circuit 240 may be formed by an rf power amplifier, for example, the power amplifier circuit 240 may be selected to meet the IEEE802.11 specification and specification index to at least satisfy P under the design requirement of a transmission power of 30dBm 1dB Radio frequency power amplifier of =32 dBm. In other embodiments, the corresponding rf power amplifier may be selected according to the transmit power requirement, for example, when the transmit power is 28dBm, the power specification index may be selected to at least satisfy P 1dB Radio frequency power amplifier of =30 dBm.
Optionally, referring to fig. 4, in one embodiment, the power impedance circuit 250 includes: a forty-first capacitor C41, a forty-second capacitor C42, a forty-third capacitor C43, a first resistor R1, a sixth inductor L6, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15 and a sixteenth capacitor C16, a first end of the eleventh capacitor C11, a first end of the twelfth capacitor C12, a first end of the thirteenth capacitor C13 and a first end of the first resistor R1 are commonly connected to the output end of the power amplification circuit 240, a second end of the eleventh capacitor C11 is grounded, a second end of the twelfth capacitor C12 is grounded, a second end of the first resistor R1 is commonly connected to a power supply signal with the first end of the forty-first capacitor C41, the first end of the forty-second capacitor C42 and the first end of the forty-third capacitor C43, a second end of the thirteenth capacitor C13, the first end of the fourteenth capacitor C14 and the first end of the sixth inductor L6 are connected to the first end of the forty-first capacitor C41, the second end of the fourteenth capacitor C14 is commonly connected to the sixteenth capacitor C42, the second end of the sixteenth capacitor C6 and the fifteenth capacitor C16 are commonly connected to the sixteenth capacitor C16, the sixteenth capacitor C16 is commonly connected to the sixteenth capacitor C16, and the sixteenth capacitor C16 is commonly connected to the sixteenth capacitor C16.
Optionally, the power impedance circuit 250 further includes a capacitor CZ2, a first end of the capacitor CZ2 is connected to the second end of the sixth inductor L6 and the first end of the fifteenth capacitor C15, and a second end of the capacitor CZ2 is connected to the switching control circuit 400.
Referring to fig. 2, in one embodiment, a receiving channel 300 includes: the input end of the input matched filter circuit 310 is connected with the switching connection circuit 400, the output end of the input matched filter circuit 310 is connected with the input end of the low noise amplifier circuit 320, the output end of the low noise amplifier circuit 320 is connected with the input end of the output matched filter circuit 330, the output end of the output matched filter circuit 330 is connected with the input end of the unbalanced-balanced conversion circuit 340, and the output end of the unbalanced-balanced conversion circuit 340 is connected with the second DC bias circuit 350 and the control circuit 100.
The low noise amplifier 320 is used for filtering and amplifying the second rf signal into a second target rf signal. The input matching filter circuit 310 is used to perform impedance matching of the input terminal of the low noise amplifier circuit 320. The output matching filter circuit 330 is used for impedance matching of the output terminal of the low noise amplifier circuit 320. The unbalanced-balanced conversion circuit 340 is configured to perform single-ended differential conversion on the second target rf signal and output the second target rf signal as the first differential rf signal to the control circuit 100. The second dc bias circuit 350 is used to provide a dc bias voltage to the connection port of the unbalanced-balanced conversion circuit 340 and the control circuit 100.
It can be understood that, in the receiving channel 300 in this embodiment, by using the low-noise amplifying circuit 320, the input matched filter circuit 310, the output matched filter circuit 330, the unbalanced-balanced conversion circuit 340, and the second dc bias circuit 350, signal filtering and power amplification of the second radio frequency signal are implemented, and meanwhile, the input and output of the low-noise amplifying circuit 320 are fully matched with the antenna impedance, so that the line impedance of the receiving channel 300 is matched with the antenna impedance, and the receiving sensitivity of the receiving channel 300 is improved.
It is understood that the connection port of the unbalanced-balanced conversion circuit 340 and the control circuit 100 may be an input port of the control circuit 100 that receives a driver.
It is understood that the second dc bias circuit 350 and the balun circuit 340 need to be dc isolated and may be connected by a dc blocking capacitor.
Alternatively, in other embodiments, when the control circuit 100 is formed by a lan controller capable of directly inputting a single-ended signal, the receiving channel 300 does not include the balun circuit 340, and the second target rf signal is directly transmitted to the control circuit 100 in the state of the single-ended signal.
It is understood that the second dc bias circuit 350 may be integrated in the control circuit 100, or may be separately disposed outside the control circuit 100. For example, when the control circuit 100 is used to integrate a dc bias circuit into a connection port of a lan controller, the receiving channel 300 may not include the second dc bias circuit 350.
Optionally, referring to fig. 5, in an embodiment, the second dc bias circuit 350 includes:
the first end of the twenty-first capacitor C21 and the first end of the twenty-second inductor L22 are commonly connected to the first input end of the control circuit 100, the first end of the twenty-first capacitor C21 and the first end of the twenty-first inductor L21 are commonly connected to the second input end of the control circuit 100, the second end of the twenty-second capacitor C22 and the first end of the twenty-second inductor L22 are commonly connected to the first end of the bias power supply, the second end of the twenty-third capacitor C23 is grounded, the second end of the twenty-second inductor L22 and the first end of the twenty-fourth capacitor C24 are commonly connected to the second end of the bias power supply, the second end of the twenty-fourth capacitor C24 is grounded, and the second ends of the twenty-first capacitor C21 and the twenty-second capacitor C22 are respectively connected to the unbalanced-balanced conversion circuit. It is understood that the second terminal of the twenty-first capacitor C21 serves as the first terminal of the second dc bias circuit 350, and the second terminal of the twenty-second capacitor C22 serves as the second terminal of the second dc bias circuit 350.
Optionally, referring to fig. 5, in an embodiment, the unbalanced-balanced conversion circuit 340 includes:
a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a third inductor L3, and a fourth inductor L4, wherein a first end of the fifth capacitor C5, a first end of the third inductor L3, and a first end of the sixth capacitor C6 are commonly connected to the first end of the second dc bias circuit 350, a second end of the fifth capacitor C5, a first end of the seventh capacitor C7, and a first end of the fourth inductor L4 are commonly connected to the second end of the second dc bias circuit 350, a second end of the third inductor L3 is grounded, a second end of the seventh capacitor C7 is grounded, and a second end of the sixth capacitor C6 and a second end of the fourth inductor L4 are commonly connected to the output matched filter circuit 330.
Optionally, referring to fig. 5, in an embodiment, the output matched filter circuit 330 includes:
the first end of the twenty-fifth inductor L25 and the first end of the twenty-eighth capacitor C28 are connected to the input end of the unbalanced-balanced conversion circuit 340 in common, the second end of the twenty-eighth capacitor C28 is connected to the ground, the second end of the twenty-fifth inductor L25 and the first end of the twenty-ninth capacitor C29 are connected to the first end of the capacitor CZ3 in common, the second end of the capacitor CZ3 is connected to the output end of the low noise amplification circuit 320, and the second end of the twenty-ninth capacitor C29 is connected to the ground through the thirty-fifth capacitor C30.
Optionally, referring to fig. 6, in an embodiment, the input matched filter circuit 310 includes:
the first end of the thirty-first capacitor C31 and the first end of the twenty-sixth inductor L26 are commonly connected to the input end of the low noise amplifier circuit 320, the second end of the thirty-first capacitor C31 is grounded, the second end of the twenty-sixth inductor L26, the first end of the thirty-second capacitor C32 and the first end of the thirty-fourth capacitor C34 are commonly connected, the second end of the thirty-fourth capacitor C34 is connected to the switching connection circuit 400, the second end of the thirty-second capacitor C32 is connected to the first end of the thirty-third capacitor C33, and the second end of the thirty-third capacitor C33 is grounded.
Referring to fig. 2, in one embodiment, the switch connection circuit 400 includes: a multi-way switch circuit 410 and an antenna matching filter circuit 420, a first side of the multi-way switch circuit 410 is connected to the transmission channel 200 and the reception channel 300, and the antenna matching filter circuit 420 is connected in series between the multi-way switch circuit 410 and the antenna 20. The multiplexer circuit 410 is used to switch the transmission channel 200 and the reception channel 300. The antenna matching filter circuit 420 is used to match the output impedance of the transmission channel 200 with the antenna impedance and to match the antenna impedance with the input impedance of the reception channel 300.
It is understood that the multiplexing switch circuit 410 may be formed by a multiplexer, a multiplexing switch, or other radio frequency switching devices.
Optionally, in an embodiment, referring to fig. 7, the antenna matching and filtering circuit 420 includes: the first end of the seventeenth capacitor C17 is connected with the multi-way switch circuit 410, the second end of the seventeenth capacitor C17 is connected with the first end of the eighteenth capacitor C18 and the first end of the seventh inductor L7, the second end of the eighteenth capacitor C18 is grounded, the second end of the seventh inductor L7 and the first end of the nineteenth capacitor C19 are connected to the antenna 20 in common, the second end of the nineteenth capacitor C19 is connected with the first end of the twentieth capacitor C20, and the second end of the twentieth capacitor C20 is grounded.
It is understood that the power amplification circuit 240 may be placed in a maximum power point-of-load matching state by the power impedance circuit 250, i.e., the output power of the power amplification circuit 240 is maximized, and then the antenna matching filter circuit 420 is adjusted, so that the line impedance of the transmission channel 200 is matched with the antenna impedance.
A second aspect of the embodiments of the present application provides a WiFi module, including: an antenna 20, a power supply circuit 30 and a WiFi circuit 10 as the first aspect of the embodiments of the present application; the antenna 20 is connected with the WiFi circuit 10; the power circuit 30 is used to supply power to the WiFi circuit 10.
Referring to fig. 8, in one embodiment, the power circuit 30 includes: the WiFi wireless power supply comprises a primary buck-boost circuit 31, an energy storage circuit 32, a current limiting circuit 33 and a power supply output circuit 34, wherein the primary buck-boost circuit 31 is used for being externally connected with a power supply 40, the output end of the primary buck-boost circuit 31 is connected with the energy storage circuit 32 and the input end of the current limiting circuit 33, the output end of the current limiting circuit 33 is connected with the power supply output circuit 34, and the power supply output circuit 34 is connected with the WiFi circuit 10. The primary step-up/down circuit 31 is configured to convert a power supply voltage of the power supply 40 into a target voltage and output the target voltage; the tank circuit 32 is used to store a target voltage; the current limiting circuit 33 is used to limit the current of the target voltage; the power supply output circuit 34 is used for outputting the current-limited target voltage to the WiFi circuit 10 to supply power to the WiFi circuit 10.
It is understood that the power circuit 30 may further include a secondary voltage-reducing circuit, and the secondary voltage-reducing circuit is configured to convert the target voltage into the first operating voltage and then supply power to an external device such as an SoC or a hard disk cartridge.
It is understood that the primary step-up/step-down circuit 31 may be formed of a DC-DC voltage conversion chip. The tank circuit 32 may be formed by a super capacitor. The current limiting circuit 33 may be constituted by a current limiting protection chip. The power supply output circuit 34 may be constituted by a connector or the like.
It is understood that the WiFi module further includes a low voltage converting circuit, wherein the low voltage converting circuit is used to convert the target voltage into a plurality of working voltages to power the power amplifying circuit 240, the control circuit 100, and the like. Illustratively, one working scenario of the power supply circuit 30 in this embodiment in combination with a low voltage conversion circuit is as follows: the external power source 40 is a vehicle-mounted power source, a direct current power source in a DC8-36V range is input into the vehicle-mounted host, the direct current power source is rectified into a target voltage (such as direct current 12V) through the primary voltage-boosting circuit 31 and then is transmitted to the power supply output circuit 34 through the current-limiting circuit 33, the WiFi circuit 10 is installed on the power supply output circuit 34 in a connector mode, the power supply output circuit 34 directly supplies power to the WiFi circuit 10 through the high voltage 12V, and the working voltage of the power amplification circuit 240 and the working voltage of the control circuit 100 are generated through voltage reduction and conversion of the low voltage conversion circuit.
Optionally, in an embodiment, the WiFi module further includes a plurality of heat sinks, and the heat sinks are respectively installed near core devices of the control circuit 100, the power amplification circuit 240, and the low noise amplification circuit 320, such as a radio frequency power amplifier, a wireless local area network controller, and the like, so as to achieve good heat dissipation performance.
Optionally, in an embodiment, a ground shield is further disposed on the periphery of the WiFi module, so as to reduce the radiation interference.
Referring to fig. 9, a second aspect of the embodiments of the present application provides a WiFi debugging method, where the WiFi debugging method is applied to the WiFi circuit 10 of the first aspect of the embodiments of the present application, and the WiFi debugging method includes:
step S100: determining the type selection of the control circuit 100 and the DC bias network form thereof;
it will be appreciated that the selection of the control circuit 100 and its dc bias network form may be determined according to target WiFi design requirements, including target WiFi specifications, target frequency bands, etc. The target WiFi specification may be a corresponding specification of IEEE 802.11. Specifically, the controller model satisfying the requirements in terms of interfaces and supported protocols can be selected according to the design requirements of the target WiFi, and the control circuit 100 can be constructed, and the device models of the first dc bias circuit 210 and the second dc bias circuit 350 are confirmed in combination with the specification characteristics of the controller, for example, the models of the dc blocking inductors of the first dc bias circuit 210 and the second dc bias circuit 350 can be selected as the inductor with the chip lamination type and the inductance value of 15 nH.
It is understood that, in one embodiment, step S100 is followed by step S500: the selection of the power amplifying circuit 240 is determined. The power amplifier circuit 240 may be formed by a radio frequency power amplifier, for example, the corresponding specification and specification index applicable to IEEE802.11 may be selected to satisfy P according to the design requirement of the transmission power of 30dBm 1dB Model number of =32 dBm.
Step S200: circuit tuning the transmission channel 200 so that the line impedance of the transmission channel 200 matches the impedance of the antenna 20;
optionally, the transmission channel 200 includes: a balun circuit 220, a first dc bias circuit 210, a first matched filter circuit 230, a power amplifier circuit 240, and a power impedance circuit 250. In one embodiment, referring to fig. 10, step S200 specifically includes:
step S210: adjusting device parameters of the power impedance circuit 250 to make the power amplifying circuit 240 in a target power load point matching state;
it is understood that the device parameters of the power impedance circuit 250 may be adjusted according to the highest power requirement, wherein the highest power requirement is a target power indicator of the WiFi circuit 10. The maximum power requirement may be set according to the actual application requirements, and may be 30dBm, for example. The power amplifier circuit 240 may be constructed by first selecting an appropriate rf power amplifier according to the highest power requirement.
It can be understood that an optimal power load matching network can be constructed, so that the load network and the output characteristics of the rf power amplifier are well matched, and finally, the whole power amplifying circuit 240 outputs the maximum power, thereby exerting the maximum utility of the rf power amplifier. Specifically, the complete method and step operation is as follows:
1. obtaining a simulation model and a reference design of the radio frequency power amplifier, and determining a reference design circuit form of the radio frequency power amplifier;
2. inputting a reference circuit form of the radio frequency power amplifier in ADS simulation design software, and configuring data such as circuit board lamination, routing length and width of the radio frequency power amplifier part, material parameters and precision of the selected inductor and capacitor in a simulation environment according to actual parameters of a circuit board of the WiFi circuit 10;
3. the parameter range of each device in the circuit is determined through simulation. Simulating indexes such as S parameters, output power, noise coefficients and the like of the whole radio-frequency power amplifier circuit, judging the stability margin and interval of the radio-frequency power amplifier through the S parameters (under the general condition, a small-power radio-frequency amplifier is generally stable in a large range), and comprehensively determining the optimal solution of the power impedance network by combining the distribution areas of a power circular diagram and a noise circular diagram;
step S220: the power amplification circuit 240 is disconnected from the first matched filter circuit 230, and the output end of the first matched circuit is connected to the network analyzer;
it can be understood that the network analyzer can be used to detect S parameters such as return loss of the line, so as to detect the impedance matching degree of the line. At this time, the control circuit 100 is in the operating state of the transmission signal, that is, the control circuit 100 is in the packet transmitting operating state.
Step S230: detecting a first matching degree of a first line impedance of the transmission channel 200 and an output impedance of the control circuit 100 at the moment;
it is understood that the first line impedance at this time can be adjusted by adjusting parameters of the inductor and the capacitor of the first matched filter circuit 230. The output impedance of the control circuit 100 may specifically be the output impedance of the connection port where the control circuit 100 is connected to the transmission channel 200.
Step S240: judging whether the first matching degree is a target matching degree or not;
it is understood that the target matching degree can be set according to requirements, for example, when the first line impedance is completely matched with the output impedance of the transmission channel 200 of the control circuit 100, the target matching degree is 100%. In order to take the minimum noise design into consideration, the high-frequency noise filtering and the impedance matching degree can be properly balanced and cut off, so that the first target radio-frequency signal output by the power amplifying circuit is ensured to have a better signal-to-noise ratio.
Step S250: if the first matching degree is not the target matching degree, the first matched filter circuit 230 is debugged according to the difference between the first matching degree and the target matching degree, so that the first line impedance is matched with the output impedance of the transmission channel 200 of the control circuit 100;
it will be appreciated that the Smith chart and the return loss S are combined by the network analyzer 11 The readings and trends of the amplitude-frequency curve adjust the first line impedance such that the first line impedance matches the transmit channel 200 output impedance, i.e., such that the first line impedance matches the first line impedanceThe matching degree is the target matching degree.
Step S260: if the first matching degree is the target matching degree, the first matched filter circuit 230 is disconnected from the network analyzer, and the input end of the transmission channel in the switching connection circuit 400 is connected to the network analyzer, so as to control the switching connection circuit 400 to switch to the transmission channel;
step S270: detecting a second matching degree of the second line impedance of the transmission channel 200 and the antenna impedance at the moment;
step S280: judging whether the second matching degree is the target matching degree or not;
step S290: if the second matching degree is not the target matching degree, the switching connection circuit 400 is debugged according to the difference value between the second matching degree and the target matching degree, so that the second line impedance is matched with the antenna impedance;
it is understood that, when the switch connection circuit includes the antenna matching filter circuit 420 and the multi-way switch circuit 410, the antenna matching filter circuit 420 is specifically debugged.
It will be appreciated that the combination of the Smith chart and the return loss S is performed by a network analyzer 11 The read value and trend of the amplitude-frequency curve are used to adjust the antenna matching filter circuit 420, so that the second line impedance is consistent with the antenna impedance, that is, the second matching degree is the target matching degree. The first line impedance and the second line impedance are line impedances of the transmission channel 200 at different acquisition instants.
It can be understood that, since the most circular and the least noise circle of the core device rf power amplifier of the power amplifier circuit 240 generally do not have an intersection, the most and the least noise design indexes of the WiFi circuit 10 cannot be satisfied at the same time, so that in order to achieve both of them, the maximum power load network parameter of the power impedance circuit 250 needs to be comprehensively confirmed by combining multiple debugging of Error Vector Magnitude (EVM) indexes according to actual requirements in addition to performing impedance matching.
Step S300: circuit tuning the reception channel 300 so that the line impedance of the reception channel 300 matches the impedance of the antenna 20;
optionally, the receiving channel 300 includes a low noise amplifying circuit 320, an input matched filter circuit 310, an output matched filter circuit 330, an unbalanced-balanced conversion circuit 340, and a second dc bias circuit 350, in an embodiment, referring to fig. 11, step S300 specifically includes:
step S310: connecting the WiFi circuit 10 to the antenna 20, removing the low noise amplification circuit 320;
step S320: the output end of the input matched filter circuit 310 is connected to a network analyzer, and the switching connection circuit 400 is controlled to be switched to the receiving channel 300;
it is understood that when the switch connection circuit includes the antenna matching filter circuit 420 and the multi-switch circuit 410, the multi-switch circuit 410 is specifically controlled to switch to the receiving channel 300.
Step S330: detecting a third matching degree of the third line impedance of the receiving channel 300 and the antenna impedance at the moment;
step S340: judging whether the third matching degree is the target matching degree or not;
step S350: if the third matching degree is not the target matching degree, the input matching filter circuit 310 is debugged according to the difference value between the third matching degree and the target matching degree, so that the impedance of the third circuit is matched with the impedance of the antenna;
step S360: if the third matching degree is the target matching degree, the connection between the output end of the input matched filter circuit 310 and the network analyzer is disconnected, the input end of the output matched filter circuit 330 is connected to the network analyzer, and the control circuit 100 is set to be in a packet receiving working state;
step S370: detecting a fourth matching degree of the fourth line impedance of the receiving channel 300 and the input impedance of the receiving channel 300 at this time;
step S380: judging whether the fourth matching degree is the target matching degree or not;
step S390: if the fourth matching degree is not the target matching degree, the output matched filter circuit 330 is debugged according to the difference between the fourth matching degree and the target matching degree, so that the fourth line impedance is matched with the input impedance of the receiving channel 300.
Step S400: the power of the WiFi circuit 10 is calibrated.
It will be appreciated that the WiFi circuit 10 may be power calibrated by a WiFi integrated tester. Specifically, the transmission power, the EVM, the frequency offset of the transmission channel 200 under the configuration value, and whether the indexes such as the receiving sensitivity of the receiving channel 300 meet the requirements of the IEEE802.11 specification may be tested by traversing each radio frequency channel in different modes, if the indexes meet the requirements, the test is passed, the tester generates a group of power calibration values and updates the statistical record, the user may write the power calibration values into the memory of the control circuit 100 to be stored, thereby completing the calibration, if the tester fails to pass the index test for many times, the calibration process may be terminated and the statistical record may be updated, and at this time, the user needs to perform problem troubleshooting.
Optionally, in an embodiment, step S400 specifically includes:
step S410: acquiring a target power index and a target receiving sensitivity;
step S420: testing whether the power index of the transmission channel 200 is a target power index and whether the receiving sensitivity of the receiving channel 300 is a target receiving sensitivity;
step S430: if so, generating and outputting a power calibration value file, and updating a calibration record;
step S440: if not, then the transmit channel 200 and/or receive channel 300 circuits are retuned.
It is understood that, at this time, when the power index of the transmission channel 200 is not the target power index, the process returns to step S200 to perform circuit tuning on the transmission channel 200. When the reception sensitivity of the reception channel 300 is not the target reception sensitivity, the process returns to step S300, and the circuit tuning is performed on the reception channel 300.
It is understood that the WiFi debugging method may further include circuit tuning of the clock crystal oscillation precision of the control circuit 100, specifically including the following steps:
1. a non-contact debugging method is adopted, the frequency deviation of the crystal oscillation circuit is adjusted to be within the target precision by means of a spectrum analyzer, and the capacitance value of the load capacitor is determined through multi-sample statistics; wherein, the target accuracy value can be determined according to the target WiFi specification, and can be, for example, ± 5ppm, ± 10ppm, etc.
2. The selection of the crystal is debugged and checked, so that the negative resistance of the crystal oscillation circuit is in a reasonable range of the equivalent series resistance of the crystal, for example, the range of 5-10 times, and the crystal can be ensured to start oscillation stably and cannot be overdriven.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A WiFi circuit connected to an antenna, the WiFi circuit comprising:
a control circuit;
the transmitting channel is connected with the control circuit and used for carrying out differential single-ended conversion and power amplification processing on a first radio frequency signal under the control of the control circuit, outputting the first radio frequency signal as a first target radio frequency signal and outputting the first target radio frequency signal to the antenna;
the receiving channel is connected with the control circuit and used for filtering and amplifying the accessed second radio frequency signal under the control of the control circuit and outputting the second radio frequency signal as a second target radio frequency signal; and
a switch connection circuit connected to the transmission channel, the reception channel, and the antenna, the switch connection circuit configured to switch the transmission channel and the reception channel to the antenna, and to set an output impedance of the transmission channel so that the output impedance matches an antenna impedance of the antenna, and to set an input impedance of the reception channel so that the input impedance matches the antenna impedance;
wherein the transmission channel and the reception channel each include a conversion unit;
the conversion unit is used for mutual conversion of a differential radio frequency signal and a single-ended radio frequency signal, a first input/output end of the conversion unit is connected with the control circuit and used for accessing or outputting the differential radio frequency signal, and a second input/output end of the conversion unit is connected with the matched filter circuit and used for accessing or outputting the single-ended radio frequency signal;
the conversion unit comprises a fifth capacitor, a sixth capacitor, a seventh capacitor, a third inductor and a fourth inductor, wherein the first end of the fifth capacitor, the first end of the third inductor and the first end of the sixth capacitor are connected to the first end of the control circuit in a sharing mode, the second end of the fifth capacitor, the first end of the seventh capacitor and the first end of the fourth inductor are connected to the second end of the control circuit in a sharing mode, the second end of the third inductor is grounded, the second end of the seventh capacitor is grounded, and the second end of the sixth capacitor and the second end of the fourth inductor are connected to the matched filter circuit in a sharing mode.
2. The WiFi circuit of claim 1 wherein said conversion unit comprises a balance-to-unbalance conversion circuit, said matched filter circuit comprises a first matched filter circuit, said transmit channel comprises: the balance-unbalance conversion circuit, the first direct current bias circuit, the first matched filter circuit, the power amplification circuit and the power impedance circuit;
the input end of the balance-unbalance conversion circuit is connected with the control circuit, and the balance-unbalance conversion circuit is used for accessing the first radio-frequency signal output by the control circuit and converting the first radio-frequency signal into a first single-ended radio-frequency signal in a differential single-ended manner;
the first direct current bias circuit is connected with the control circuit and the balance-unbalance conversion circuit, and is used for providing direct current bias voltage for a connection port of the control circuit connected with the balance-unbalance conversion circuit;
the first matching filter circuit is connected with the balance-unbalance conversion circuit, and is used for matching the input impedance of the power amplification circuit, filtering out high-frequency noise of the first single-ended radio-frequency signal and outputting the high-frequency noise as a filtered radio-frequency signal;
the power impedance circuit is connected in series between the power amplification circuit and the switching connection circuit and is used for carrying out maximum power load point impedance matching on the power amplification circuit;
the power amplifying circuit is connected with the first matching filter circuit, and the power amplifying circuit is used for amplifying the filtered radio frequency signal into the first target radio frequency signal based on the impedance matching of the power impedance circuit and then outputting the first target radio frequency signal to the switching connection circuit.
3. The WiFi circuit of claim 1 wherein said conversion unit comprises an unbalanced to balanced conversion circuit, said matched filter circuit comprises an output matched filter circuit, said receive channel comprises:
the low-noise amplifying circuit is used for filtering and amplifying the second radio frequency signal into a second target radio frequency signal;
the input matching filter circuit is connected between the switching connection circuit and the input end of the low-noise amplification circuit in series, and is used for performing impedance matching on the input end of the low-noise amplification circuit;
the output matching filter circuit is connected with the output end of the low-noise amplifying circuit and is used for performing impedance matching on the output end of the low-noise amplifying circuit;
the input end of the unbalanced-balanced conversion circuit is connected with the output matched filter circuit, the output end of the unbalanced-balanced conversion circuit is connected with the control circuit, and the unbalanced-balanced conversion circuit is used for performing single-ended differential conversion on the second target radio frequency signal and outputting the second target radio frequency signal as a first differential radio frequency signal to the control circuit; and
and the second direct current bias circuit is connected with the control circuit and the unbalanced-balanced conversion circuit and is used for providing direct current bias voltage for a connection port of the unbalanced-balanced conversion circuit and the control circuit.
4. The WiFi circuit of any of claims 1-3 wherein the switch connection circuit comprises:
a multi-way switch circuit, a first side of the multi-way switch circuit is connected with the transmitting channel and the receiving channel, and the multi-way switch circuit is used for switching and gating the transmitting channel or the receiving channel; and
and the antenna matching filter circuit is connected between the multi-way switch circuit and the antenna in series and is used for matching the output impedance of the sending channel with the antenna impedance and matching the antenna impedance with the input impedance of the receiving channel.
5. A WiFi module, comprising:
the WiFi circuit of any one of claims 1-4;
an antenna connected to the WiFi circuit; and
and the power supply circuit is used for supplying power to the WiFi circuit.
6. The WiFi module of claim 5 wherein the power circuit comprises:
the primary boost-buck circuit is used for being externally connected with a power supply, converting the input voltage of the power supply into a target voltage and outputting the target voltage;
the energy storage circuit is connected with the primary buck-boost circuit and is used for storing energy of a standby power supply for the target voltage;
the current-limiting protection circuit is connected with the primary boost circuit and the energy storage circuit and is used for limiting the current of the target voltage and realizing overload protection; and
and the power supply output circuit is connected with the WiFi circuit and is used for outputting the current-limited target voltage to the WiFi circuit so as to supply power to the WiFi circuit.
7. A WiFi debugging method, characterized in that, the WiFi debugging method is applied to the WiFi circuit of any one of the above claims 1 to 4, the WiFi debugging method includes:
determining the type selection of the control circuit and the form of a direct current bias network thereof;
performing circuit tuning on the transmission channel to match a line impedance of the transmission channel with an impedance of the antenna;
performing circuit tuning on the receiving channel to match a line impedance of the receiving channel with an impedance of the antenna;
and calibrating the power of the WiFi circuit.
8. The WiFi debugging method of claim 7 wherein said transmitting channel comprises: the balanced-unbalanced conversion circuit, the first direct current bias circuit, the first matched filter circuit, the power amplification circuit and the power impedance circuit, which are used for tuning the transmission channel to match the line impedance of the transmission channel with the impedance of the antenna, comprises:
adjusting device parameters of the power impedance circuit to enable the power amplification circuit to be in a target power load point matching state;
disconnecting the power amplification circuit from the first matched filter circuit, and connecting the output end of the first matched filter circuit to a network analyzer;
detecting a first matching degree of a first line impedance of the transmission channel and an output impedance of the control circuit at the moment;
judging whether the first matching degree is a target matching degree;
if the first matching degree is not the target matching degree, debugging the first matched filter circuit according to the difference value of the first matching degree and the target matching degree to match the first line impedance with the output impedance of the control circuit connection port;
if the first matching degree is the target matching degree, disconnecting the first matched filter circuit from the network analyzer, connecting the input end of a sending channel in the switching connection circuit to the network analyzer, and controlling the switching connection circuit to switch to the sending channel;
detecting a second matching degree of a second line impedance of the transmission channel and the antenna impedance at the moment;
judging whether the second matching degree is the target matching degree or not;
and if the second matching degree is not the target matching degree, debugging the switching connection circuit according to the difference value between the second matching degree and the target matching degree to match the second line impedance with the antenna impedance.
9. The WiFi debugging method of claim 7 wherein said receive channel comprises a low noise amplification circuit, an input matched filter circuit, an output matched filter circuit, an unbalanced to balanced conversion circuit, and a second dc bias circuit, said circuit tuning of said receive channel comprising:
connecting the WiFi circuit to the antenna, and removing the low-noise amplification circuit;
connecting the output end of the input matching filter circuit to a network analyzer, and controlling the switching connection circuit to switch to the receiving channel;
detecting a third matching degree of a third line impedance of the receiving channel and an antenna impedance at the moment;
judging whether the third matching degree is a target matching degree;
if the third matching degree is not the target matching degree, debugging the input matching filter circuit according to the difference value between the third matching degree and the target matching degree to match the third line impedance with the antenna impedance;
if the third matching degree is the target matching degree, disconnecting the output end of the input matching filter circuit from the network analyzer, and connecting the input end of the output matching filter circuit to the network analyzer;
detecting a fourth matching degree of a fourth line impedance of the receiving channel and an input impedance of the control circuit connection port at the moment;
judging whether the fourth matching degree is a target matching degree or not;
and if the fourth matching degree is not the target matching degree, debugging the output matching filter circuit according to the difference value of the fourth matching degree and the target matching degree to match the fourth line impedance with the input impedance of the control circuit connection port.
10. The WiFi debugging method of claim 7, wherein the calibrating the power of the WiFi circuit comprises:
acquiring a target power index and a target receiving sensitivity;
testing whether the power index of the sending channel is the target power index and whether the receiving sensitivity of the receiving channel is the target receiving sensitivity;
if so, generating and outputting a power calibration value file, and updating a calibration record;
and if not, performing circuit tuning on the sending channel and/or the receiving channel again.
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| CN114615810B (en) * | 2022-04-12 | 2023-08-29 | 欧智通科技股份有限公司 | WiFi module integrated circuit layout method |
| CN115001524A (en) * | 2022-08-01 | 2022-09-02 | 深圳市亿联无限科技有限公司 | WIFI radio frequency system based on LC discrete component |
| CN115775967B (en) * | 2022-12-21 | 2023-12-12 | 小米汽车科技有限公司 | Antenna impedance matching circuit, method, vehicle, storage medium, and chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6735418B1 (en) * | 1999-05-24 | 2004-05-11 | Intel Corporation | Antenna interface |
| US20100253435A1 (en) * | 2004-03-18 | 2010-10-07 | Ikuroh Ichitsubo | Rf power amplifier circuit utilizing bondwires in impedance matching |
| US7479850B2 (en) * | 2006-04-05 | 2009-01-20 | Tdk Corporation | Miniaturised half-wave balun |
| US7468638B1 (en) * | 2006-06-20 | 2008-12-23 | Marvell International Ltd. | Transmit/receive switch device |
| CN101753157B (en) * | 2008-12-18 | 2014-04-16 | 雷凌科技股份有限公司 | RF transceiver front end circuit |
| US8649739B2 (en) * | 2010-01-06 | 2014-02-11 | Rfaxis, Inc. | Increased receive sensitivity radio frequency front end integrated circuits |
| CN105515081A (en) * | 2014-10-18 | 2016-04-20 | 杨利 | Stable output type car power supply system |
| CN106899359B (en) * | 2017-02-17 | 2020-08-14 | 青岛海信宽带多媒体技术有限公司 | WIFI module radio frequency calibration method |
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