CN113839685B - Digital-analog signal circuit board and landline telephone - Google Patents
Digital-analog signal circuit board and landline telephone Download PDFInfo
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- CN113839685B CN113839685B CN202111144931.5A CN202111144931A CN113839685B CN 113839685 B CN113839685 B CN 113839685B CN 202111144931 A CN202111144931 A CN 202111144931A CN 113839685 B CN113839685 B CN 113839685B
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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
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
- H04M7/0066—Details of access arrangements to the networks
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Abstract
The application provides a digital-analog signal circuit board and a fixed telephone. The digital-analog signal circuit board comprises a circuit mainboard, a power circuit and a signal circuit; the circuit main board is provided with at least one welding surface used for welding a circuit; the power circuit is positioned on the welding surface; the signal circuit comprises a digital circuit and an analog circuit, the digital circuit and the analog circuit are both welded on the welding surface, the first connecting end of the power circuit is electrically connected with the connecting end of the digital circuit, and the second connecting end of the power circuit is electrically connected with the connecting end of the analog circuit, so that the digital circuit and the analog circuit are connected to the power circuit in parallel. The digital circuit and the analog circuit are respectively connected with the power supply circuit, so that the digital circuit and the analog circuit are mutually independently connected with the power supply circuit, and the power supply signal in the digital circuit can only be transmitted to the power supply circuit after fluctuating, thereby reducing the probability of crosstalk to the analog circuit.
Description
Technical Field
The invention relates to the technical field of circuit boards, in particular to a digital-analog signal circuit board and a fixed-line telephone.
Background
With the development of mobile wireless communication networks, a mobile wireless communication system is adopted to perform mixed integration of server audio package downloading and playing and analog FM receiving system playing, wherein if all server audio packages are adopted for downloading, a terminal is densely installed, and a mobile communication base station cannot bear the conditions, particularly scenes such as singing and meetings, so that the mobile base station needs to be additionally erected. For a small speaker in a mobile wireless communication system, a communication terminal in which audio package downloading and playing and FM receiving and playing are mixed is generally adopted.
However, the circuit board of the conventional communication terminal adopts a double-sided board, and digital radio frequency signals therein will seriously interfere with FM signals without a shielding case having high shielding performance like in a multi-layer board, thereby resulting in poor FM radio reception.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a digital-analog signal circuit board and a fixed-line telephone with improved anti-interference capability.
The purpose of the invention is realized by the following technical scheme:
a digital-to-analog signal circuit board comprising: the circuit comprises a circuit mainboard, a power circuit and a signal circuit; the circuit main board is provided with at least one welding surface, and the welding surface is used for welding a circuit; the power circuit is positioned on the welding surface; the signal circuit comprises a digital circuit and an analog circuit, the digital circuit and the analog circuit are both welded on the welding surface, a first connecting end of the power circuit is electrically connected with a connecting end of the digital circuit, and a second connecting end of the power circuit is electrically connected with a connecting end of the analog circuit, so that the digital circuit and the analog circuit are connected to the power circuit in parallel.
In one embodiment, the first power output terminal of the power circuit is connected to the power supply terminal of the digital circuit, and the second power output terminal of the power circuit is connected to the power supply terminal of the analog circuit.
In one embodiment, the analog circuit is located remotely from at least one of the power circuit and the digital circuit.
In one embodiment, the first common ground of the power circuit is connected to the ground of the digital circuit.
In one embodiment, the digital circuit comprises at least one of a radio frequency signal circuit, a switching power supply circuit, and a 4G signal circuit.
In one embodiment, the second common ground terminal of the power supply circuit is connected to the ground terminal of the analog circuit.
In one embodiment, the analog circuit includes a frequency modulation signal circuit and a first magnetic bead, a ground terminal of the frequency modulation signal circuit is connected to a first terminal of the first magnetic bead, and a second terminal of the first magnetic bead is connected to the second common ground terminal of the power supply circuit.
In one embodiment, the analog circuit includes an audio switch circuit and an audio power amplifier circuit, a ground terminal of the audio switch circuit is connected to a ground terminal of the audio power amplifier circuit, and the ground terminal of the audio switch circuit is further connected to the second common ground terminal of the power supply circuit.
In one embodiment, the analog circuit further includes a second magnetic bead, a ground terminal of the audio switch circuit is connected to a first terminal of the second magnetic bead, and a second terminal of the second magnetic bead is connected to the second common ground terminal of the power supply circuit.
A fixed-line telephone comprising the digital-to-analog signal circuit board of any of the above embodiments.
Compared with the prior art, the invention has at least the following advantages:
the power circuit, the digital circuit and the analog circuit are all arranged on the circuit mainboard, wherein the digital circuit and the analog circuit are respectively connected with the power circuit, namely the digital circuit is connected with a first connecting end of the power circuit, the analog circuit is connected with a second connecting end of the power circuit, so that the digital circuit and the analog circuit are mutually and independently connected with the power circuit, after power signals in the digital circuit fluctuate, the power signals can only be transmitted to the power circuit, the probability of crosstalk to the analog circuit is reduced, the anti-interference capability of the analog circuit is effectively improved, and the transmission stability of the analog signals in the analog circuit is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a diagram of a digital-to-analog signal circuit board according to an embodiment;
FIG. 2 is a schematic diagram of another view of the digital-to-analog signal circuit board shown in FIG. 1;
FIG. 3 is a diagram of a digital-to-analog signal circuit board in another embodiment;
fig. 4 is a schematic diagram of another view angle of the digital-analog signal circuit board shown in fig. 3.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention relates to a digital-analog signal circuit board. In one embodiment, the digital-to-analog signal circuit board comprises a circuit main board, a power supply circuit and a signal circuit. The circuit main board is provided with at least one welding surface, and the welding surface is used for welding a circuit. The power circuit is located on the welding face. The signal circuit includes a digital circuit and an analog circuit. The digital circuit and the analog circuit are both welded on the welding surface. The first connecting end of the power circuit is electrically connected with the connecting end of the digital circuit, and the second connecting end of the power circuit is electrically connected with the connecting end of the analog circuit, so that the digital circuit and the analog circuit are connected to the power circuit in parallel. The power circuit, the digital circuit and the analog circuit are all arranged on the circuit mainboard, wherein the digital circuit and the analog circuit are respectively connected with the power circuit, namely the digital circuit is connected with a first connecting end of the power circuit, the analog circuit is connected with a second connecting end of the power circuit, so that the digital circuit and the analog circuit are mutually and independently connected with the power circuit, after power signals in the digital circuit fluctuate, the power signals can only be transmitted to the power circuit, the probability of crosstalk to the analog circuit is reduced, the anti-interference capability of the analog circuit is effectively improved, and the transmission stability of the analog signals in the analog circuit is improved.
Please refer to fig. 1, which is a schematic structural diagram of a digital-analog signal circuit board according to an embodiment of the present invention.
The digital-to-analog signal circuit board 10 of an embodiment includes a circuit board 100, a power circuit 200, and a signal circuit 300. The circuit board 100 has at least one soldering surface for soldering a circuit. The power circuit 200 is located on the bonding surface. The signal circuit 300 includes a digital circuit 310 and an analog circuit 320. The digital circuit 310 and the analog circuit 320 are both soldered to the soldering surface. The first connection terminal of the power circuit 200 is electrically connected to the connection terminal of the digital circuit 310, and the second connection terminal of the power circuit 200 is electrically connected to the connection terminal of the analog circuit 320, so that the digital circuit 310 and the analog circuit 320 are connected to the power circuit 200 in parallel.
In this embodiment, the power circuit 200, the digital circuit 310, and the analog circuit 320 are all disposed on the circuit board 100, wherein the digital circuit 310 and the analog circuit 320 are respectively connected to the power circuit 200, that is, the digital circuit 310 is connected to the first connection terminal of the power circuit 200, and the analog circuit 320 is connected to the second connection terminal of the power circuit 200, so that the digital circuit 310 and the analog circuit 320 are independently connected to the power circuit 200, and after the power signal in the digital circuit 310 fluctuates, the power signal can only be transmitted to the power circuit 200, thereby reducing the probability of crosstalk to the analog circuit 320, effectively improving the anti-interference capability of the analog circuit 320, and improving the transmission stability of the analog signal in the analog circuit 320. Fig. 1 and fig. 2 are schematic diagrams of two opposite surfaces of the digital-to-analog signal circuit board 10.
In one embodiment, referring to fig. 1 and fig. 2, the first power output terminal 202 of the power circuit 200 is connected to the power supply terminal of the digital circuit 310, and the second power output terminal 204 of the power circuit 200 is connected to the power supply terminal of the analog circuit 320. In this embodiment, the power circuit 200 serves as a main power supply module, the power circuit 200 provides a plurality of power supply voltages or currents, and the first power output terminal 202 of the power circuit 200 is connected to the power supply terminal of the digital circuit 310. The first power supply output 202 of the power supply circuit 200 is shown as a first output of the overall power supply to provide a corresponding supply voltage or current to the digital circuit 310. The connection of the second power output terminal 204 of the power circuit 200 with the power supply terminal of the analog circuit 320 indicates that the second power output terminal 204 of the power circuit 200 is used as the second output terminal of the main power supply to provide the analog circuit 320 with the corresponding power supply voltage or current. Since the supply voltage required by the digital circuit 310 is different from the supply voltage in the analog circuit 320, by connecting to different power output terminals, on one hand, the corresponding voltage is provided for the corresponding circuit, and on the other hand, the digital circuit 310 is separated from the analog circuit 320 by the first power output terminal 202 and the second power output terminal 204, so that the digital circuit 310 and the analog circuit 320 are independent from each other, and the interference signal generated by the digital circuit 310 can be effectively isolated in the power circuit 200 and cannot be interfered to the analog circuit 320, thereby reducing the interference to the analog circuit 320, improving the anti-radiation interference capability of the analog circuit 320 on the high-frequency digital signal, and improving the transmission stability of the analog signal in the analog circuit 320.
In one embodiment, referring to fig. 1 and 2, the analog circuit 320 is disposed remotely from at least one of the power circuit 200 and the digital circuit 310. In this embodiment, the analog circuit 320 and the digital circuit 310 are both disposed on the welding surface, the analog circuit 320 and the digital circuit 310 are further connected to the power circuit 200, and in combination with the structure that the analog circuit 320 is disposed away from the digital circuit 310, the distance between the position of the welding surface of the analog circuit 320 and the position of the welding surface of the digital circuit 310 is relatively large, so that the radiation interference of the digital signal of the digital circuit 310 on the analog circuit 320 is reduced, and the radiation interference resistance of the digital circuit 310 is improved. Moreover, in this embodiment, the analog circuit 320 is also disposed far away from the power circuit 200, and since the first power output terminal 202 of the power circuit 200 is connected to the power supply terminal of the digital circuit 310, when the signal in the digital circuit 310 fluctuates, the crosstalk signal generated by the digital circuit 310 will generate a response on the power circuit 200, so as to generate a secondary crosstalk, and the analog circuit 320 is disposed far away from the power circuit 200, so as to reduce the interference from the power circuit 200, further reduce the probability of the analog circuit 320 being interfered, and further improve the transmission stability of the analog signal in the analog circuit 320.
In one embodiment, referring to fig. 1 and fig. 2, the first common terminal of the power circuit 200 is connected to the ground terminal of the digital circuit 310. In this embodiment, the first common ground of the power circuit 200 is used to connect a ground of a circuit, for example, the ground of the digital circuit 310, and when the first power output terminal 202 of the power circuit 200 is connected to the power supply terminal of the digital circuit 310, the ground of the digital circuit 310 is further connected to the first common ground of the power circuit 200, so that the power circuit 200 and the digital circuit 310 form a complete current loop, and thus the digital circuit 310 forms an independent current loop with the power circuit 200, and further the signal generated by the digital circuit 310 only exists in the loop formed with the power circuit 200, thereby reducing the influence on the analog circuit 320, and reducing the radiation interference on the analog circuit 320. In another embodiment, the digital circuit includes at least one of a radio frequency signal circuit, a switching power supply circuit, and a 4G signal circuit. The rf signal circuit, the switching power supply circuit, and the 4G signal circuit may be connected to the power supply circuit 200 through one power supply output terminal, or may be connected to the power supply circuit 200 through three different power supply output terminals, for example, the rf signal circuit, the switching power supply circuit, and the 4G signal circuit are respectively connected to three power supply output terminals of the power supply circuit 200. The connection between the ground terminals of the radio frequency signal circuit, the switching power supply circuit, and the 4G signal circuit and the common ground terminal of the power supply circuit 200 is similar to the connection between the power supply output terminals, that is, the connection may be made through one common ground terminal, or through three common ground terminals, which is not described herein again.
In one embodiment, referring to fig. 1 and fig. 2, the second common ground of the power circuit 200 is connected to the ground of the analog circuit 320. In this embodiment, the second common ground of the power circuit 200 is used to connect a ground of a circuit, for example, the ground of the analog circuit 320, and when the second power output terminal 204 of the power circuit 200 is connected to the power supply terminal of the analog circuit 320, the ground of the analog circuit 320 is further connected to the second common ground of the power circuit 200, so that the power circuit 200 and the analog circuit 320 form a complete current loop, and thus the analog circuit 320 forms an independent current loop with the power circuit 200, and further a signal generated by the digital circuit 310 is only present in the loop formed by the power circuit 200, and cannot crosstalk to the loop formed by the analog circuit 320 and the power circuit 200, and further reduces the influence on the analog circuit 320, thereby further reducing the radiation interference on the analog circuit 320.
Furthermore, the analog circuit comprises a frequency-modulated signal circuit and a first magnetic bead, a ground terminal of the frequency-modulated signal circuit is connected with a first end of the first magnetic bead, and a second end of the first magnetic bead is connected with a second common ground terminal of the power supply circuit. In the present embodiment, the FM signal circuit is used as a radio circuit of a radio, and the FM signal circuit is used for receiving FM antenna signals, i.e., analog signals. In order to further reduce the interference of the analog signal on the frequency modulation signal circuit, the first magnetic bead is additionally arranged between the frequency modulation signal circuit and the power supply circuit, and the interference on the power supply line between the frequency modulation signal circuit and the power supply circuit is further reduced through the interference of the first magnetic bead on the high-frequency noise and the peak on a suppression signal line and the power supply line and the capacity of absorbing electrostatic pulse, so that the interference resistance of the analog circuit is further improved, the frequency modulation signal circuit on the digital-analog signal circuit board is ensured to accurately transmit the frequency modulation signal, and the receiving sensitivity of the digital-analog signal circuit board on the FM signal is improved.
In another embodiment, a plurality of filter capacitors are further added to a second connection terminal of the fm signal circuit and the power circuit, for example, the filter capacitors are capacitors of 10P and 33P, and have small carrier frequency impedances for 3G, 4G, and 5G channels, thereby performing a high-frequency filtering function. In this embodiment, the digital-analog signal circuit board has a receiving sensitivity of-103 DBM for FM signals, which is substantially close to the sensitivity of professional FM brand radios, which has a sensitivity of-104 DBM.
Still further, referring to fig. 1 and fig. 2, the analog circuit 320 includes an audio switch circuit 322 and an audio power amplifier circuit 324, a ground terminal of the audio switch circuit 322 is connected to a ground terminal of the audio power amplifier circuit 324, and a ground terminal of the audio switch circuit 322 is further connected to the second common ground terminal of the power circuit 200. In this embodiment, the audio switch circuit 322 and the audio power amplifier circuit 324 are used as an audio adjusting circuit of a radio, and the audio switch circuit 322 and the audio power amplifier circuit 324 are used to adjust the amplitude of the received FM antenna signal, that is, whether the signals output by the audio switch circuit 322 and the audio power amplifier circuit 324 are analog signals. In order to further reduce the interference to the analog signal, the analog circuit 320 further includes a second magnetic bead, a ground terminal of the audio switch circuit 322 is connected to a first terminal of the second magnetic bead, and a second terminal of the second magnetic bead is connected to the second common ground terminal of the power circuit 200. The second magnetic bead is additionally arranged between the audio switch circuit 322 and the power supply circuit 200, and through the interference of the second magnetic bead on the high-frequency noise and the peak on the suppression signal line and the power line and the capability of absorbing electrostatic pulse, the interference on the power line between the audio switch circuit 322 and the audio power amplifier circuit 324 and the power supply circuit 200 is further reduced, so that the anti-interference capability of the analog circuit 320 is further improved, the frequency modulation signal circuit on the digital-analog signal circuit 300 board is ensured to accurately transmit the frequency modulation signal, and the receiving sensitivity of the digital-analog signal circuit 300 board on the FM signal is improved.
It can be understood that the circuit board of the conventional communication terminal adopts either a fixed network module or a mobile network module, so that the conventional communication terminal can only be applied to one networking mode, which often results in poor universality of the communication terminal due to the fact that the conventional communication terminal cannot be freely selected in some areas with poor communication networks or high prices.
In order to solve the above technical problem, in one embodiment, the signal circuit of the digital-to-analog signal circuit board further includes a radio frequency signal circuit. The radio frequency signal circuit comprises a public switching network circuit, a wireless spread spectrum circuit, a wireless communication circuit, a wireless network circuit and a filter capacitor. The power supply circuit is provided with a first power supply connecting end, a second power supply connecting end, a third power supply connecting end and a fourth power supply connecting end. The first power supply connection end is connected with a power supply input end of the public switched network circuit. And the second power supply connecting end is connected with the power supply input end of the wireless spread spectrum circuit. And the third power supply connecting end is connected with the power supply input end of the wireless communication circuit. And the fourth power supply connecting end is connected with the power supply input end of the wireless network circuit. And the signal input end of the public switching network circuit is connected with the first end of the filter capacitor. The first end of the filter capacitor is grounded, and the filter capacitor is used for filtering interference signals generated by the wireless communication circuit and the wireless network circuit. The first power connection end, the second power connection end and the third power connection end are arranged in a mutually separated mode, so that the wireless spread spectrum circuit, the wireless communication circuit and the wireless network circuit are connected to the power circuit in parallel. The circuit board is integrated with a public switching network circuit, a wireless spread spectrum circuit, a wireless communication circuit and a wireless network circuit, so that the digital-analog signal circuit board has the functions of fixed network communication and mobile network communication at the same time, free selection of communication forms is facilitated, the selection universality of the communication network is improved, moreover, each circuit is connected with the power circuit through different power connection ends, and by means of the filtering function of the filter capacitor, each circuit is separated from each other, the probability of mutual crosstalk between analog signals and digital signals is reduced, and the communication stability of the communication network is improved.
Please refer to fig. 3, which is a schematic diagram of a digital-analog signal circuit board according to an embodiment of the present invention.
The digital-to-analog signal circuit board 10 of an embodiment includes a circuit board 100, a power circuit 200, and a radio frequency signal circuit 330. The circuit board 100 is used for receiving a circuit. The power circuit 200 is located on the circuit board 100. The rf signal circuit 330 includes a public switched network circuit 332, a wireless spread spectrum circuit 334, a wireless communication circuit 336, a wireless network circuit 338 and a filter capacitor. Referring to fig. 4, the power circuit 200 has a first power connection terminal 206, a second power connection terminal 208, a third power connection terminal 201, and a fourth power connection terminal 203. The first power supply connection 206 is connected to a supply input of the public switched network circuit 332. The second power supply connection end 208 is connected to a power supply input end of the wireless spread spectrum circuit 334. The third power connection terminal 201 is connected to a power supply input terminal of the wireless communication circuit 336. The fourth power supply connection 203 is connected to a power supply input of the wireless network circuit 338. Wherein a signal input terminal of the common switching network circuit 332 is connected to a first terminal of the filter capacitor. A first end of the filter capacitor is grounded, and the filter capacitor is configured to filter out interference signals generated by the wireless communication circuit 336 and the wireless network circuit 338. The first power connection terminal 206, the second power connection terminal 208 and the third power connection terminal 201 are spaced apart from each other, so that the wireless spread spectrum circuit 334, the wireless communication circuit 336 and the wireless network circuit 338 are connected to the power circuit 200 in parallel.
In this embodiment, a public switched network circuit 332, a wireless spread spectrum circuit 334, a wireless communication circuit 336 and a wireless network circuit 338 are integrated on the circuit main board 100, so that the digital-analog signal circuit board has functions of both fixed network communication and mobile network communication, which facilitates free selection of communication forms, and improves the universality of selection of communication networks, and moreover, each circuit is connected with the power circuit 200 through different power connection terminals, and by means of the filtering function of the filter capacitor, each circuit is separated from each other, and the probability of mutual crosstalk between analog signals and digital signals is reduced, thereby improving the communication stability of the communication networks. Fig. 3 and 4 are schematic diagrams of two opposite surfaces of a digital-analog signal circuit board according to another embodiment.
In one embodiment, referring to fig. 3, the digital-to-analog signal circuit board has a wireless network antenna area, the wireless network circuit 338 is disposed adjacent to the wireless network antenna area, and the radio frequency signal circuit 330 further includes a wireless network antenna, the wireless network antenna is located in the wireless network antenna area, and the wireless network antenna is connected to a wireless receiving end of the wireless network circuit 338. In this embodiment, the wireless network antenna area is adjacent to the area where the wireless network circuit 338 is located, the wireless network antenna is arranged in the wireless network antenna area, the wireless network antenna is used as a network signal receiving component of the wireless network circuit 338, the wireless network antenna is connected with a wireless receiving end of the wireless network circuit 338, so that wireless network signals can be conveniently guided into the wireless network circuit 338, moreover, the wireless network antenna in the wireless network antenna area is tiled on the circuit board 100, the wireless network antenna does not need to be arranged in a direction perpendicular to the circuit board 100, and the packaging volume of the digital-analog signal circuit board is reduced.
Further, referring to fig. 3, the wireless network antenna includes an antenna curved portion 3382 and an antenna straight portion 3384, a first end of the antenna curved portion 3382 is connected to the wireless receiving end of the wireless network circuit 338, and a second end of the antenna curved portion 3382 is connected to a first end of the antenna straight portion 3384. In this embodiment, the antenna bending portion 3382 is disposed away from the antenna straight portion 3384, and the antenna straight portion 3384 is connected to the control circuit of the wireless network circuit, so that both the antenna signal reception and transmission of the antenna bending portion 3382 are away from the control circuit of the wireless network circuit, and thus the antenna signal reception of the antenna bending portion 3382 is away from other radio frequency circuits, thereby reducing interference on the antenna signal reception and transmission of the antenna bending portion 3382, and improving stability and accuracy of the wireless network antenna for receiving the antenna signal. In another embodiment, the curvature of the antenna curved portion 3382 is 90 °, and the antenna straight portion 3384 and the edge of the circuit board 100 are parallel to each other, so that the distance from the antenna curved portion 3382 to other radio frequency circuits is maximized, which is convenient for further reducing interference on receiving and transmitting the antenna signal of the antenna curved portion 3382, and further improving stability and accuracy of the wireless network antenna for receiving the antenna signal.
In one embodiment, the radio frequency signal circuit further includes a magnetic spreading bead, the second power connection terminal is connected to a first end of the magnetic spreading bead, and a second end of the magnetic spreading bead is connected to a power supply input terminal of the wireless spreading circuit. In this embodiment, the radio frequency signal circuit is used as a receiving and processing circuit for a main digital signal on the digital-analog signal circuit board, the radio frequency signal circuit also generates some high-frequency interference signals, and the spread spectrum magnetic bead is additionally arranged between the wireless spread spectrum circuit and the power supply circuit, so that the high-frequency interference signals generated by the wireless spread spectrum circuit are reduced, that is, the interference on the power supply line between the wireless spread spectrum circuit and the power supply circuit is further reduced by the capability of the spread spectrum magnetic bead on suppressing high-frequency noise and peak interference on a signal line and the power supply line, and absorbing electrostatic pulses, thereby further improving the anti-interference capability of the radio frequency signal circuit and ensuring that the radio frequency signal circuit accurately transmits radio frequency signals.
In one embodiment, referring to fig. 3, the wireless spreading circuit 334 is located remotely from the wireless communication circuit 336. In this embodiment, the wireless spectrum spreading circuit 334 and the wireless communication circuit 336 are both disposed on the welding surface, the wireless spectrum spreading circuit 334 and the wireless communication circuit 336 are further connected to the power circuit 200, and in combination with the structure that the wireless spectrum spreading circuit 334 is disposed away from the wireless communication circuit 336, a distance between a position of the wireless spectrum spreading circuit 334 on the welding surface and a position of the wireless communication circuit 336 on the circuit board 100 is relatively large, so that the radiated interference of the digital signal of the wireless communication circuit 336 on the wireless spectrum spreading circuit 334 is reduced, and the radiation interference resistance of the wireless spectrum spreading circuit 334 and the wireless communication circuit 336 is improved, that is, the mutual crosstalk between the wireless spectrum spreading circuit 334 and the wireless communication circuit 336 is reduced. Moreover, in this embodiment, the wireless spread spectrum circuit 334 is also disposed far away from the power supply circuit 200, since the second power connection end 208 of the power supply circuit 200 is connected to the power supply input end of the wireless communication circuit 336, when the signal in the wireless communication circuit 336 fluctuates, the crosstalk signal generated by the wireless communication circuit 336 will generate a response on the power supply circuit 200, so as to generate a secondary crosstalk, and the wireless spread spectrum circuit 334 is disposed far away from the power supply circuit 200, so as to reduce the interference from the power supply circuit 200, further reduce the probability that the wireless spread spectrum circuit 334 is interfered, and further improve the transmission stability of the analog signal in the wireless spread spectrum circuit 334. The same is true for the wireless communication circuit 336, i.e., the crosstalk from the wireless spreading circuit 334 is reduced.
In one embodiment, referring to fig. 3, the wireless spreading circuit 334 is located remotely from the wireless network circuit 338. In this embodiment, the wireless spread spectrum circuit 334 and the wireless network circuit 338 are both disposed on the welding surface, the wireless spread spectrum circuit 334 and the wireless network circuit 338 are further connected to the power supply circuit 200, and in combination with the structure that the wireless spread spectrum circuit 334 is disposed away from the wireless network circuit 338, a distance between the position of the wireless spread spectrum circuit 334 on the welding surface and the position of the wireless network circuit 338 on the circuit board 100 is relatively large, so that the radiation interference of the wireless spread spectrum circuit 334 on the digital signal of the wireless network circuit 338 is reduced, and the radiation interference resistance of the wireless spread spectrum circuit 334 and the wireless network circuit 338, that is, the mutual crosstalk between the wireless spread spectrum circuit 334 and the wireless network circuit 338 is reduced. Moreover, in this embodiment, the wireless spread spectrum circuit 334 is also disposed far away from the power supply circuit 200, since the second power connection end 208 of the power supply circuit 200 is connected to the power supply input end of the wireless network circuit 338, when the signal in the wireless network circuit 338 fluctuates, the crosstalk signal generated by the wireless network circuit 338 will generate a response on the power supply circuit 200, so as to generate a secondary crosstalk, and the wireless spread spectrum circuit 334 is disposed at a position far away from the power supply circuit 200, so as to reduce the interference from the power supply circuit 200, further reduce the probability that the wireless spread spectrum circuit 334 is interfered, and further improve the transmission stability of the analog signal in the wireless spread spectrum circuit 334. The same is true for the wireless network circuit 338, i.e., the crosstalk from the wireless spreading circuit 334 is reduced.
In one embodiment, referring to fig. 3, the wireless communication circuit 336 is remotely located from the wireless network circuit 338. In this embodiment, the wireless communication circuit 336 and the wireless network circuit 338 are both disposed on the welding surface, the wireless communication circuit 336 and the wireless network circuit 338 are further connected to the power supply circuit 200, and in combination with the structure that the wireless communication circuit 336 is disposed away from the wireless network circuit 338, the distance between the position of the wireless communication circuit 336 on the welding surface and the position of the wireless network circuit 338 on the circuit board 100 is relatively large, so that the radiation interference of the wireless communication circuit 336 by the digital signal of the wireless network circuit 338 is reduced, and the radiation interference resistance of the wireless communication circuit 336 and the wireless network circuit 338 is improved, that is, the mutual crosstalk between the wireless communication circuit 336 and the wireless network circuit 338 is reduced. Moreover, in this embodiment, the wireless communication circuit 336 is also disposed far away from the power supply circuit 200, and since the second power connection end 208 of the power supply circuit 200 is connected to the power supply input end of the wireless network circuit 338, when a signal in the wireless network circuit 338 fluctuates, a crosstalk signal generated by the wireless network circuit 338 will generate a response on the power supply circuit 200, so as to generate a secondary crosstalk, and the wireless communication circuit 336 is disposed far away from the power supply circuit 200, so as to reduce interference from the power supply circuit 200, further reduce the probability of interference on the wireless communication circuit 336, and further improve the transmission stability of the analog signal in the wireless communication circuit 336. The same is true for the wireless network circuit 338, i.e., crosstalk from the wireless communication circuit 336 is reduced.
In each of the above embodiments, the Public Switched Network circuit is specifically a PSTN (Public Switched Telephone Network) circuit, the wireless spread spectrum circuit is specifically a DECT (Digital Enhanced Cordless communications) circuit, the wireless communication circuit is specifically a 3G, 4G, or 5G communication circuit, the wireless Network circuit is specifically a WIFI communication circuit, the filter capacitor includes capacitors with capacitance values of 10PF and 33PF for filtering out 4G wireless channel interference, and the filter capacitor further includes a capacitor with a capacitance value of 5.6PF for filtering out WIFI channel interference.
In one embodiment, the present application further provides a signal fusion landline telephone including the digital-to-analog signal circuit board according to any of the above embodiments. In this embodiment, the digital-to-analog signal circuit board includes a circuit board, a power circuit, and a radio frequency signal circuit. The circuit mainboard is used for bearing a circuit. The power circuit is located on the circuit main board. The radio frequency signal circuit comprises a public switching network circuit, a wireless spread spectrum circuit, a wireless communication circuit, a wireless network circuit and a filter capacitor. The power circuit is provided with a first power connection end, a second power connection end, a third power connection end and a fourth power connection end. The first power supply connection end is connected with a power supply input end of the public switched network circuit. And the second power supply connecting end is connected with the power supply input end of the wireless spread spectrum circuit. And the third power supply connecting end is connected with the power supply input end of the wireless communication circuit. And the fourth power supply connecting end is connected with the power supply input end of the wireless network circuit. Wherein a signal input terminal of the public switched network circuit is connected with a first terminal of the filter capacitor. The first end of the filter capacitor is grounded, and the filter capacitor is used for filtering interference signals generated by the wireless communication circuit and the wireless network circuit. The first power connection end, the second power connection end and the third power connection end are arranged in a mutually separated mode, so that the wireless spread spectrum circuit, the wireless communication circuit and the wireless network circuit are connected to the power circuit in parallel. The circuit board is integrated with a public switching network circuit, a wireless spread spectrum circuit, a wireless communication circuit and a wireless network circuit, so that the digital-analog signal circuit board has the functions of fixed network communication and mobile network communication at the same time, free selection of communication forms is facilitated, the selection universality of the communication network is improved, moreover, each circuit is connected with the power circuit through different power connection ends, and by means of the filtering function of the filter capacitor, each circuit is separated from each other, the probability of mutual crosstalk between analog signals and digital signals is reduced, and the communication stability of the communication network is improved.
In one embodiment, the present application further provides a landline telephone including the digital-to-analog signal circuit board according to any of the above embodiments. In this embodiment, the digital-to-analog signal circuit board includes a circuit board, a power circuit, and a signal circuit. The circuit main board is provided with at least one welding surface, and the welding surface is used for welding a circuit. The power circuit is located on the welding face. The signal circuit includes a digital circuit and an analog circuit. The digital circuit and the analog circuit are both welded on the welding surface. The first connecting end of the power circuit is electrically connected with the connecting end of the digital circuit, and the second connecting end of the power circuit is electrically connected with the connecting end of the analog circuit, so that the digital circuit and the analog circuit are connected to the power circuit in parallel. The power circuit, the digital circuit and the analog circuit are all arranged on the circuit mainboard, wherein the digital circuit and the analog circuit are respectively connected with the power circuit, namely the digital circuit is connected with a first connecting end of the power circuit, the analog circuit is connected with a second connecting end of the power circuit, so that the digital circuit and the analog circuit are mutually and independently connected with the power circuit, after power signals in the digital circuit fluctuate, the power signals can only be transmitted to the power circuit, the probability of crosstalk to the analog circuit is reduced, the anti-interference capability of the analog circuit is effectively improved, and the transmission stability of the analog signals in the analog circuit is improved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A digital-to-analog signal circuit board, comprising:
the circuit board is provided with at least one welding surface, and the welding surface is used for welding a circuit;
a power circuit located on the welding face;
the signal circuit comprises a digital circuit and an analog circuit, the digital circuit and the analog circuit are both welded on the welding surface, a first connecting end of the power circuit is electrically connected with a connecting end of the digital circuit, and a second connecting end of the power circuit is electrically connected with a connecting end of the analog circuit, so that the digital circuit and the analog circuit are connected to the power circuit in parallel;
the second common ground terminal of the power supply circuit is connected with the ground terminal of the analog circuit; the analog circuit comprises a frequency modulation signal circuit and a first magnetic bead, the grounding end of the frequency modulation signal circuit is connected with the first end of the first magnetic bead, and the second end of the first magnetic bead is connected with the second common ground end of the power supply circuit.
2. The digital-to-analog signal circuit board of claim 1, wherein a first power output terminal of the power circuit is connected to a power supply terminal of the digital circuit, and a second power output terminal of the power circuit is connected to a power supply terminal of the analog circuit.
3. The digital-to-analog signal circuit board of claim 1, wherein the analog circuit is remotely located from at least one of the power circuit and the digital circuit.
4. The digital-to-analog signal circuit board of claim 1, wherein the first common ground of the power circuit is connected to a ground terminal of the digital circuit.
5. The digital-to-analog signal circuit board of claim 1, wherein the digital circuit comprises at least one of a radio frequency signal circuit, a switching power supply circuit, and a 4G signal circuit.
6. The digital-to-analog signal circuit board of claim 1, wherein the analog circuit comprises an audio switch circuit and an audio power amplifier circuit, a ground terminal of the audio switch circuit is connected to a ground terminal of the audio power amplifier circuit, and the ground terminal of the audio switch circuit is further connected to the second common ground terminal of the power circuit.
7. The digital-to-analog signal circuit board of claim 6, wherein the analog circuit further comprises a second magnetic bead, a ground terminal of the audio switch circuit is connected to a first terminal of the second magnetic bead, and a second terminal of the second magnetic bead is connected to the second common ground terminal of the power circuit.
8. A landline telephone comprising a digital-to-analog signal circuit board as claimed in any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111144931.5A CN113839685B (en) | 2021-09-28 | 2021-09-28 | Digital-analog signal circuit board and landline telephone |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111144931.5A CN113839685B (en) | 2021-09-28 | 2021-09-28 | Digital-analog signal circuit board and landline telephone |
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| CN113839685A CN113839685A (en) | 2021-12-24 |
| CN113839685B true CN113839685B (en) | 2023-03-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202033847U (en) * | 2011-05-25 | 2011-11-09 | 重庆南天数据资讯服务有限公司 | Wireless pos machine |
| CN203149738U (en) * | 2013-01-08 | 2013-08-21 | 深圳市中科英泰科技有限公司 | Wireless intelligent POS machine |
| CN108242928A (en) * | 2016-12-27 | 2018-07-03 | 北京普源精电科技有限公司 | The power supply circuit and spectrum analyzer of a kind of ADC |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209845280U (en) * | 2019-06-12 | 2019-12-24 | 深圳市金锐显数码科技有限公司 | Voice sound pickup circuit and device |
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2021
- 2021-09-28 CN CN202111144931.5A patent/CN113839685B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202033847U (en) * | 2011-05-25 | 2011-11-09 | 重庆南天数据资讯服务有限公司 | Wireless pos machine |
| CN203149738U (en) * | 2013-01-08 | 2013-08-21 | 深圳市中科英泰科技有限公司 | Wireless intelligent POS machine |
| CN108242928A (en) * | 2016-12-27 | 2018-07-03 | 北京普源精电科技有限公司 | The power supply circuit and spectrum analyzer of a kind of ADC |
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| CN113839685A (en) | 2021-12-24 |
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