CN116094877B - Differential signal transmission circuit and data transmission device - Google Patents
Differential signal transmission circuit and data transmission device Download PDFInfo
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- CN116094877B CN116094877B CN202310376242.XA CN202310376242A CN116094877B CN 116094877 B CN116094877 B CN 116094877B CN 202310376242 A CN202310376242 A CN 202310376242A CN 116094877 B CN116094877 B CN 116094877B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
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Abstract
The application provides a differential signal transmission circuit and a data transmission device, and belongs to the technical field of electronic circuits. In the differential signal transmission circuit, the data transmission unit includes: the device comprises a numerical control current module, a current-to-voltage module and an output matching module; the numerical control current module comprises a plurality of groups of current control circuits, and is used for switching in input current, generating current signals corresponding to the number of the groups of current control circuits and transmitting the current signals to the current-to-voltage module; the current-to-voltage module is used for converting the current signal transmitted by the numerical control current module into a voltage signal and transmitting the voltage signal to the output matching module; the output matching module is used for carrying out impedance matching on the voltage signals and transmitting the matched voltage signals to the external transmission line. The circuit can provide various current signals, and a level shifting circuit is not required to be arranged, so that the complexity of the circuit is reduced.
Description
Technical Field
The present disclosure relates to the field of electronic circuits, and in particular, to a differential signal transmission circuit and a data transmission device.
Background
Among the various types of data lines, for example: earphone wires, etc., are generally required to communicate with a terminal device to which they are connected based on the data wire, for example: adjust headphone volume, adjust play pause, etc.
In the prior art, communication between the data line and the terminal device is mainly realized by low-voltage differential signaling (Low Voltage Differential Signaling, LVDS), and the circuit can generate an electric signal based on a driving current source so as to realize the required communication.
However, in the prior art, when the transmission of the low-voltage differential signal is implemented, the operating point thereof is close to the current source or close to 0 due to the limitation of the circuit structure, which results in the need of additionally providing a level shifting circuit in the circuit, thereby increasing the complexity of the circuit.
Disclosure of Invention
The invention provides a differential signal transmission circuit and a data transmission device, which can provide various current signals, and a level shift circuit is not required to be arranged, so that the complexity of the circuit is reduced.
Embodiments of the present application are implemented as follows:
in one aspect of the embodiments of the present application, there is provided a differential signal transmission circuit, including: the data receiving unit and the data transmitting unit are respectively connected with the external transmission line; wherein the data transmission unit includes: the device comprises a numerical control current module, a current-to-voltage module and an output matching module;
the numerical control current module is connected with the current-to-voltage module, comprises a plurality of groups of current control circuits, and is used for accessing input current, generating current signals corresponding to the plurality of groups of current control circuits and transmitting the current signals to the current-to-voltage module;
the current-to-voltage module is connected with the output matching module and is used for converting the current signal transmitted by the numerical control current module into a voltage signal and transmitting the voltage signal to the output matching module;
the output matching module is used for carrying out impedance matching on the voltage signals and transmitting the matched voltage signals to the external transmission line.
Optionally, the current-to-voltage module includes two groups of conversion sub-modules, each group of conversion sub-modules including: a first amplifier and a conversion circuit connected in parallel with the first amplifier;
the first amplifier receives the current signal transmitted by the numerical control current module and converts the current signal into a voltage signal through the conversion circuit.
Optionally, the conversion circuit includes: a first capacitor, a second capacitor, a first resistor and a first switch;
the first capacitor and the first resistor are respectively connected with the first amplifier in parallel;
the second capacitor is connected in series with the first switch and then is connected in parallel with the first amplifier as a whole.
Optionally, the differential signal transmission circuit further includes: a second amplifier;
the first input end of the second amplifier is connected with the reference voltage signal, the second input end of the second amplifier is connected with the output end of the second amplifier, and the output end of the second amplifier is also connected with the second input end of the first amplifier in each conversion sub-module.
Optionally, the input ends of at least one group of current control circuits in the plurality of groups of current control circuits are respectively used for accessing input current, and the output ends of each group of current control circuits are respectively connected with the current-to-voltage module.
Optionally, the output matching module includes two sets of matching sub-modules, each set of matching sub-modules including: a transmission switch and a matching circuit connected in parallel with the transmission switch.
Optionally, the matching circuit includes: a second resistor, a third resistor, a fourth resistor, a second switch, a third switch and a fourth switch;
the second resistor is connected with the second switch in series and then is connected with the transmission switch in parallel integrally;
the third resistor is connected with the third switch in series and then is connected with the transmission switch in parallel integrally;
the fourth resistor is connected in series with the fourth switch and then is connected in parallel with the transmission switch as a whole.
Optionally, the data receiving unit includes: the filtering detection module and the hysteresis comparison module;
the filtering detection module is connected with the hysteresis comparison module and is used for receiving the voltage signal transmitted by the external transmission line, filtering the voltage signal and transmitting the filtered voltage signal to the hysteresis comparison module;
the hysteresis comparison module is used for performing hysteresis adjustment on the voltage signal and transmitting the voltage signal after hysteresis adjustment to the logic control circuit.
Optionally, the hysteresis comparison module includes: the device comprises a hysteresis comparator with a controllable hysteresis array and a Smith inverter connected with the hysteresis comparator, wherein the controllable hysteresis array consists of a plurality of MOS tubes.
Another aspect of an embodiment of the present application provides a data transmission apparatus, including: and the logic control circuit is connected with each group of current control circuits of the differential signal transmission circuit and the data receiving unit, and is used for controlling whether current is input to each group of current control circuits or not and receiving signals from the data receiving unit.
The beneficial effects of the embodiment of the application include:
in the differential signal transmission circuit and the data transmission device provided by the embodiment of the application, an input current is accessed through a numerical control current module, current signals corresponding to the number of a plurality of groups of current control circuits are generated, and the current signals are transmitted to a current-to-voltage module; the current signal transmitted by the numerical control current module is converted into a voltage signal through the current-to-voltage module, and the voltage signal is transmitted to the output matching module; and carrying out impedance matching on the voltage signals through an output matching module, and transmitting the matched voltage signals to an external transmission line. The numerical control current module comprises a plurality of groups of current control circuits, different current signals can be generated based on the number of the current control circuits connected, so that various current signals can be generated without depending on the power supply of an input current source, the setting of a level transfer circuit is avoided, and the complexity of the circuit is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a differential signal transmission circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a current-to-voltage module in a differential signal transmission circuit according to an embodiment of the present application;
fig. 3 is another schematic structural diagram of a differential signal transmission circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an output matching module in the differential signal transmission circuit provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a data receiving unit according to an embodiment of the present application;
fig. 6 is another schematic structural diagram of a data receiving unit according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a data transmission device according to an embodiment of the present application.
Icon: 100-a data receiving unit; 110-a filtering detection module; a 120-hysteresis comparison module; a 121-smith inverter; 122-hysteresis comparator; 200-a data transmission unit; 210-a numerical control current module; 220-a current-to-voltage module; 230-an output matching module; 710-logic control circuitry; 720-a differential signal transmission circuit; r1-a first resistor; r2-a second resistor; r3-a third resistor; r4-fourth resistor; r5-fifth resistor; c1-a first capacitance; c2-a second capacitance; a C3-third capacitor; c4-fourth capacitance; t1-a transmission switch; t2-turn-on switch; b1-a first amplifier; b2-a second amplifier; s1-a first switch; s2-a second switch; s3-a third switch; s4-fourth switch.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
It should be noted that, in the prior art, when LVDS is adopted for communication, an electrical signal is generated based on a driving current source, so as to realize communication, and in a circuit structure, after the current source is connected, the working electricity of the whole circuit is close to the current source voltage or 0, so that an additional level transfer circuit is required to be set, and the complexity of the circuit is higher.
In order to solve the above problems in the prior art, a differential signal transmission circuit is provided in the embodiments of the present application, and a specific circuit structure of the differential signal transmission circuit and an operation principle thereof are specifically explained below.
Fig. 1 is a schematic structural diagram of a differential signal transmission circuit provided in an embodiment of the present application, referring to fig. 1, the differential signal transmission circuit includes: the data receiving unit 100 and the data transmitting unit 200, the data receiving unit 100 and the data transmitting unit 200 are respectively connected with external transmission lines; wherein the data transmission unit 200 includes: a digital control current module 210, a current-to-voltage module 220, and an output matching module 230.
The digital control current module 210 is connected with the current-to-voltage module 220, wherein the digital control current module 210 comprises a plurality of groups of current control circuits, and the digital control current module 210 is used for accessing input current, generating current signals corresponding to the plurality of groups of current control circuits, and transmitting the current signals to the current-to-voltage module 220; the current-to-voltage module 220 is connected with the output matching module 230, and the current-to-voltage module 220 is configured to convert a current signal transmitted by the digitally controlled current module 210 into a voltage signal and transmit the voltage signal to the output matching module 230; the output matching module 230 is configured to perform impedance matching on the voltage signal, and transmit the matched voltage signal to an external transmission line.
Optionally, the nc current module 210 may specifically generate different currents, and the nc current module 210 may include multiple sets of current control circuits, where each set of current control circuits may be connected to a logic control circuit, and in an actual working process, the generation of different currents may be implemented based on the number of current control circuits that are connected to the logic control circuit.
For example: if there are 8 sets of current control circuits that can be connected, different currents will be generated when 1-8 sets are connected.
It should be noted that each group of current control circuits may be connected to a current source, and different output current signals are provided by each group of current control circuits, so that multiple current signals may be generated without depending on the power supply of the input current source, and the problem that the working point in the prior art is only between the current source and 0 is avoided.
Optionally, the input ends of at least one group of current control circuits in the plurality of groups of current control circuits are respectively used for accessing input current, and the output ends of each group of current control circuits are respectively connected with the current-to-voltage module.
Optionally, since the current-to-voltage module 220 and the output matching module 230 are disposed on the differential circuit, the external transmission line may also include two paths, for example: the DN line and the DP line may each have a corresponding circuit configuration connected thereto.
The current-to-voltage module 220 may specifically convert a current signal into a voltage signal by accessing a resistor, and the output matching module 230 may specifically perform impedance matching processing on the voltage signal, so as to implement transmission of the corresponding voltage signal, and may specifically implement transmission of the voltage signal through a DN line and a DP line, respectively.
In the differential signal transmission circuit provided by the embodiment of the application, input current can be accessed through the numerical control current module, current signals corresponding to the number of the plurality of groups of current control circuits are generated, and the current signals are transmitted to the current-to-voltage module; the current signal transmitted by the numerical control current module is converted into a voltage signal through the current-to-voltage module, and the voltage signal is transmitted to the output matching module; and carrying out impedance matching on the voltage signals through an output matching module, and transmitting the matched voltage signals to an external transmission line. The numerical control current module comprises a plurality of groups of current control circuits, different current signals can be generated based on the number of the current control circuits connected, so that various current signals can be generated without depending on the power supply of an input current source, the setting of a level transfer circuit is avoided, and the complexity of the circuit is reduced.
The specific structure of the current-to-voltage module provided in the embodiments of the present application and the working principle thereof are specifically explained below.
Fig. 2 is a schematic structural diagram of a current-to-voltage module in a differential signal transmission circuit provided in an embodiment of the present application, referring to fig. 2, the current-to-voltage module includes two groups of conversion sub-modules, each group of conversion sub-modules includes: a first amplifier B1 and a conversion circuit connected in parallel with the first amplifier B1; the first amplifier B1 receives the current signal transmitted by the digitally controlled current module 210, and converts the current signal into a voltage signal through a conversion circuit.
Optionally, the conversion circuit includes: a first capacitor C1, a second capacitor C2, a first resistor R1, and a first switch S1; the first capacitor C1 and the first resistor R1 are respectively connected with the first amplifier B1 in parallel; the second capacitor C2 is connected in series with the first switch S1 and then is connected in parallel with the first amplifier B1 as a whole.
It should be noted that, the first capacitor C1 and the second capacitor C2 may be used for performing digital filtering processing, and may specifically be used for filtering digital edge noise, where the second capacitor C2 may be correspondingly adjusted according to actual input, and may specifically be adjusted by the first switch S1, the first switch S1 may specifically be a switch tube, the control end may be controlled by a TRIM signal, and by accessing the TRIM signal, the second capacitor C2 may be connected or disconnected, so that overall adjustment of the capacitor size may be implemented, and filtering with different requirements may be implemented.
The first amplifier B1 may receive a current signal output from the digitally controlled current module 210, where the current signal may be I1, for example, and after passing through the first amplifier B1, a voltage signal may be obtained, which may be specifically expressed as a product of the current signal I1 and the first resistor R1, that is, i1·r1.
It should be noted that the circuit structures of the plurality of sets of current control circuits may be the same, for example: if a group of current control circuits is connected, the corresponding current signal is I1, and when two groups of current control circuits are connected, the corresponding current signal is 2×I1, and when N groups of current control circuits are connected, the corresponding current signal is N×I1.
The magnitude of the corresponding voltage signal can be calculated based on the magnitude of the current signal.
After the voltage signal is obtained by the current-to-voltage module 220, the voltage signal may be transmitted to the output matching module 230, and it should be noted that, due to the two groups of conversion circuits, two groups of voltage signals, that is, differential voltage signals, may be generated.
It should be noted that, when current-to-voltage conversion is implemented in the prior art, the resistor is disposed between two differential transmission lines, and setting the resistor in this way results in a larger resistance value of the resistor, otherwise, the actual requirement cannot be satisfied; and two groups of first resistors R1 are respectively arranged in the manner shown in fig. 2, and the resistance value of each first resistor R1 can be specifically set smaller, so that the power consumption generated in the circuit can be reduced.
The embodiment of the application provides a differential signal transmission circuit, wherein a first amplifier receives a current signal transmitted by a numerical control current module, the current signal is converted into a voltage signal through a conversion circuit, and a first capacitor and a first resistor are respectively connected with the first amplifier in parallel; the second capacitor is connected in series with the first switch and then is connected in parallel with the first amplifier as a whole. The first resistor is connected with the first amplifier in parallel, so that the setting of the resistance value can be realized more flexibly, the larger power consumption of the circuit is avoided, and the working efficiency of the circuit is improved.
Another specific structure and connection relation of the differential signal transmission circuit provided in the embodiment of the present application are specifically explained below.
Fig. 3 is another schematic structural diagram of a differential signal transmission circuit according to an embodiment of the present application, referring to fig. 3, the differential signal transmission circuit further includes: a second amplifier B2; the first input end of the second amplifier B2 is connected with a reference voltage signal, the second input end of the second amplifier B2 is connected with the output end of the second amplifier B2, and the output end of the second amplifier B2 is also connected with the second input end of the first amplifier B1 in each conversion sub-module.
It should be noted that the first amplifiers B1 may include two first input ends of each first amplifier B1 are connected to the current signal transmitted by the digitally controlled current module 210, the second input ends of each first amplifier B1 are connected to the reference voltage signal output by the second amplifier B2, and the output ends of each first amplifier B1 may be connected to the output matching module 230.
The second amplifier B2 may include one, a first input terminal of the second amplifier B2 is connected to the reference voltage reference, and a second input terminal of the second amplifier B2 is connected to an output terminal of the second amplifier B2 such that the input and the output are equal.
Providing the reference voltage signal based on the second amplifier B2 may enable the respective first amplifier B1 to better perform the current-to-voltage process.
The specific structure of the output matching module provided in the embodiment of the present application and the working principle thereof are specifically explained below.
Fig. 4 is a schematic structural diagram of an output matching module in a differential signal transmission circuit provided in an embodiment of the present application, referring to fig. 4, the output matching module includes two sets of matching sub-modules, and each set of matching sub-modules includes: a transmission switch T1 and a matching circuit connected with the transmission switch T1 in parallel.
Optionally, the matching circuit includes: the second resistor R2, the third resistor R3, the fourth resistor R4, the second switch S2, the third switch S3 and the fourth switch S4; the second resistor R2 is connected with the second switch S2 in series and then is connected with the transmission switch T1 in parallel integrally; the third resistor R3 is connected with the third switch S3 in series and then is connected with the transmission switch T1 in parallel integrally; the fourth resistor R4 is connected in series with the fourth switch S4 and then is connected in parallel with the transmission switch T1 as a whole.
Wherein, the transmission switch T1 may be controlled by a PIN signal, and may remain connected after receiving the PIN signal, so that the output matching module 230 may remain in communication with the external transmission line; conversely, if no PIN signal is received, the PIN signal is disconnected, so that the output matching module 230 is disconnected from the external transmission line.
It should be noted that, the second switch S2 and the third switch S3 may be similar to the first switch S1, and may be switching tubes, and may be controlled by a TRIM signal, so as to control the connection or disconnection of the corresponding sub-circuits, thereby implementing the resistance of the corresponding sub-circuits and implementing the matching of the output impedance.
The fourth switch S4 may also be a switching tube, and its control terminal may be controlled by the TCM signal.
The specific structure of the data transmitting unit is explained above in detail, and the specific structural relationship of the data receiving unit is explained below.
Fig. 5 is a schematic structural diagram of a data receiving unit according to an embodiment of the present application, referring to fig. 5, the data receiving unit includes: the filtering detection module 110 and the hysteresis comparison module 120.
The filtering detection module 110 is connected with the hysteresis comparison module 120, and the filtering detection module 110 is used for receiving and filtering the voltage signal transmitted by the external transmission line and transmitting the filtered voltage signal to the hysteresis comparison module 120; the hysteresis comparison module 120 is configured to perform hysteresis adjustment on the voltage signal, and transmit the hysteresis-adjusted voltage signal to the logic control circuit.
It should be noted that, the filtering detection module 110 is also a module in the differential circuit, and may specifically include two groups of sub-circuits, where each group of sub-circuits may include the on switch T2, the fifth resistor R5, the third capacitor C3, and the fourth capacitor C4.
The first end of the turn-on switch T2 is connected to the external transmission line, the second end of the turn-on switch T2 is connected to the first end of the fifth resistor R5, the control end of the turn-on switch T2 is controlled by the PIN signal, and the second end of the fifth resistor R5 is connected to the first end of the third capacitor C3, the first end of the fourth capacitor C4, and the hysteresis comparison module 120, respectively, and the second ends of the third capacitor C3 and the fourth capacitor C4 are grounded.
Specifically, the turn-on switch T2 may control whether the data receiving unit receives the externally input voltage signal, and is also controlled by the PIN signal due to the turn-on switch T2.
It should be noted that, in the process of working, if the extraction of the common mode working point is required, the fourth switch S4 may be controlled to be turned on by the TCM signal in the data sending unit, so that the fourth resistor R4 is connected to the circuit, where the fourth resistor R4 may be a high resistor, and at this time, the common mode point of the voltage signal received in the data receiving unit is from the common mode point of the data sending unit, so that the usability of the data receiving unit may be improved.
The fifth resistor R5, the third capacitor C3 and the fourth capacitor C4 may form an RC filter network, so as to filter noise from outside the voltage signal.
The filtering detection module 110 may transmit the filtered voltage signal to the hysteresis comparison module 120.
The specific structural relationship of the hysteresis comparison module in the data receiving unit and its operation principle are explained in detail below.
Fig. 6 is another schematic structural diagram of a data receiving unit according to an embodiment of the present application, referring to fig. 6, the hysteresis comparing module 120 includes: a hysteresis comparator 122 having a controllable hysteresis array and a smith inverter 121 connected to the hysteresis comparator 122, wherein the controllable hysteresis array is composed of a plurality of MOS transistors.
It should be noted that, the hysteresis comparator 122 includes 21 MOS transistors as shown in fig. 6, where the controllable hysteresis array includes four MOS transistors (four MOS transistors outlined by a dashed frame in fig. 6), and control ends of the four MOS transistors may be turned on or off by receiving an external signal, so as to implement controllability of the hysteresis comparator.
The specific connection relationship of the hysteresis comparator 122 is shown in fig. 6, and it should be noted that, the smith inverter 121 may prevent the circuit from jitter, so as to ensure that the trigger levels of the rising edge and the falling edge are different, ensure the stability of the circuit, suppress the noise from the input, and the hysteresis comparator 122 itself may effectively suppress the noise from the signal, and may implement the adjustment of the hysteresis size through the controllable hysteresis array, so that the hysteresis may be set according to the actual noise.
The specific structure of the data transmission device provided in the embodiments of the present application and the working principle thereof are specifically explained below.
Fig. 7 is a schematic structural diagram of a data transmission device according to an embodiment of the present application, referring to fig. 7, the data transmission device includes: the logic control circuit 710 and the differential signal transmission circuit 720, the logic control circuit 710 is connected to each group of current control circuits and the data receiving unit of the differential signal transmission circuit 720, and the logic control circuit 710 is configured to control whether or not to input current to each group of current control circuits and to receive signals from the data receiving unit.
Note that, the logic control circuit 710 may be one or more, and in fig. 7, two separate circuits are taken as an example, and in actual use, the logic control circuit 710 connected to the data receiving unit and the logic control circuit 710 connected to the data transmitting unit may be two different circuits or the same circuit, and the connection method shown in fig. 7 is not limited.
The logic control circuit connected with the data receiving unit can receive the voltage signals after filtering and hysteresis processing and execute corresponding relevant processing logic; and a logic control circuit of the data transmission unit, the control logic may be generated, and an arbitrary number of the current control circuits may be selected to input current based on the control logic.
Optionally, the data transmission device may be a mobile phone earphone, a transmission line, or other relevant devices, taking the mobile phone earphone as an example, where the data receiving unit may be configured to receive a voltage signal transmitted by a terminal such as a mobile phone; the data transmitting unit may be configured to generate a related control signal based on control of a user, and feed back the control signal to a terminal such as a mobile phone, for example: volume adjustment, play start pause, etc.
In the data transmission device provided by the embodiment of the application, an input current is accessed through a numerical control current module, current signals corresponding to the number of a plurality of groups of current control circuits are generated, and the current signals are transmitted to a current-to-voltage module; the current signal transmitted by the numerical control current module is converted into a voltage signal through the current-to-voltage module, and the voltage signal is transmitted to the output matching module; and carrying out impedance matching on the voltage signals through an output matching module, and transmitting the matched voltage signals to an external transmission line. The numerical control current module comprises a plurality of groups of current control circuits, different current signals can be generated based on the number of the current control circuits connected, so that various current signals can be generated without depending on the power supply of an input current source, the setting of a level transfer circuit is avoided, and the complexity of the circuit is reduced.
The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. A differential signal transmission circuit, comprising: the data receiving unit and the data transmitting unit are respectively connected with an external transmission line; wherein the data transmission unit includes: the device comprises a numerical control current module, a current-to-voltage module and an output matching module;
the numerical control current module is connected with the current-to-voltage module, comprises a plurality of groups of current control circuits, and is used for switching in input current, generating current signals corresponding to the plurality of groups of current control circuits, transmitting the current signals to the current-to-voltage module, and generating different current signals based on the number of the current control circuits;
the current-to-voltage module is connected with the output matching module and is used for converting a current signal transmitted by the numerical control current module into a voltage signal and transmitting the voltage signal to the output matching module;
the output matching module is used for carrying out impedance matching on the voltage signals and transmitting the matched voltage signals to an external transmission line.
2. The differential signaling circuit of claim 1 wherein said current-to-voltage module comprises two sets of conversion sub-modules, each set of said conversion sub-modules comprising: a first amplifier and a conversion circuit connected in parallel with the first amplifier;
the first amplifier receives the current signal transmitted by the numerical control current module and converts the current signal into a voltage signal through the conversion circuit.
3. The differential signal transmission circuit according to claim 2, wherein the conversion circuit includes: a first capacitor, a second capacitor, a first resistor and a first switch;
the first capacitor and the first resistor are respectively connected with the first amplifier in parallel;
the second capacitor is connected in series with the first switch and then is integrally connected in parallel with the first amplifier.
4. The differential signal transmission circuit according to claim 2, wherein the differential signal transmission circuit further comprises: a second amplifier;
the first input end of the second amplifier is connected with a reference voltage signal, the second input end of the second amplifier is connected with the output end of the second amplifier, and the output end of the second amplifier is also connected with the second input end of the first amplifier in each conversion sub-module.
5. The differential signal transmission circuit according to claim 1, wherein input ends of at least one of the plurality of sets of current control circuits are respectively used for accessing the input current, and output ends of the plurality of sets of current control circuits are respectively connected with the current-to-voltage module.
6. The differential signaling circuit of claim 1 wherein said output matching module comprises two sets of matching sub-modules, each set of said matching sub-modules comprising: a transmission switch and a matching circuit connected with the transmission switch in parallel.
7. The differential signal transmission circuit according to claim 6, wherein the matching circuit includes: a second resistor, a third resistor, a fourth resistor, a second switch, a third switch and a fourth switch;
the second resistor is connected with the second switch in series and then is integrally connected with the transmission switch in parallel;
the third resistor is connected with the third switch in series and then is integrally connected with the transmission switch in parallel;
and the fourth resistor is connected with the fourth switch in series and then is integrally connected with the transmission switch in parallel.
8. The differential signal transmission circuit according to any one of claims 1 to 7, wherein the data receiving unit includes: the filtering detection module and the hysteresis comparison module;
the filtering detection module is connected with the hysteresis comparison module and is used for receiving the voltage signal transmitted by the external transmission line, filtering the voltage signal and transmitting the filtered voltage signal to the hysteresis comparison module;
the hysteresis comparison module is used for performing hysteresis adjustment on the voltage signal and transmitting the voltage signal subjected to hysteresis adjustment to the logic control circuit.
9. The differential signal transmission circuit of claim 8, wherein the hysteresis comparison module comprises: the device comprises a hysteresis comparator with a controllable hysteresis array and a Smith inverter connected with the hysteresis comparator, wherein the controllable hysteresis array consists of a plurality of MOS tubes.
10. A data transmission apparatus, the apparatus comprising: logic control circuit and differential signal transmission circuit according to any one of claims 1-9, said logic control circuit being connected to each set of current control circuits of said differential signal transmission circuit and to a data receiving unit, said logic control circuit being adapted to control whether current is input to each set of current control circuits and to receive signals from said data receiving unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310376242.XA CN116094877B (en) | 2023-04-11 | 2023-04-11 | Differential signal transmission circuit and data transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310376242.XA CN116094877B (en) | 2023-04-11 | 2023-04-11 | Differential signal transmission circuit and data transmission device |
Publications (2)
| Publication Number | Publication Date |
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| CN116094877A CN116094877A (en) | 2023-05-09 |
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| CN111708463A (en) * | 2020-06-29 | 2020-09-25 | 广州华欣电子科技有限公司 | Mixed signal processing device |
| CN115118163A (en) * | 2021-03-22 | 2022-09-27 | 广州视源电子科技股份有限公司 | Multi-output circuit, control method and power supply |
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| TW319848B (en) * | 1995-06-12 | 1997-11-11 | Samsung Electronics Co Ltd | |
| JP3874357B2 (en) * | 2004-07-05 | 2007-01-31 | シャープ株式会社 | Data transmitting apparatus, data receiving apparatus, data transmitting / receiving apparatus, and data transmitting / receiving method |
| CN102386869A (en) * | 2010-08-27 | 2012-03-21 | 杭州中科微电子有限公司 | Analog/digital configurable variable-gain amplifier |
| CN102457230B (en) * | 2010-10-18 | 2015-04-01 | 中兴通讯股份有限公司 | Mixer bandwidth expansion method and apparatus thereof |
| CN103888110B (en) * | 2014-04-17 | 2016-08-24 | 苏州坤信微电子科技有限公司 | Multiselect one circuit of RF local oscillator signal |
| CN213402947U (en) * | 2020-08-14 | 2021-06-08 | 长沙泰科阳微电子有限公司 | Low-voltage differential signal receiving circuit |
| CN114649935A (en) * | 2020-12-17 | 2022-06-21 | 圣邦微电子（北京）股份有限公司 | Switch converter and control circuit thereof |
| CN214707761U (en) * | 2021-06-17 | 2021-11-12 | 浙江地芯引力科技有限公司 | Connecting device, earphone and connection converter |
| CN115001878B (en) * | 2022-05-07 | 2024-07-02 | 联芸科技(杭州)股份有限公司 | Driver of Ethernet transceiver, control method thereof and Ethernet transceiver |
| CN115297584A (en) * | 2022-06-27 | 2022-11-04 | 深圳市海洋王石油照明技术有限公司 | Electro-optical conversion circuit, optical communication system and LED lamp |
| CN115036904B (en) * | 2022-08-10 | 2022-11-01 | 深圳市联宇科技有限公司 | Internet of things power module controlled by power supply pulse |
| CN218767262U (en) * | 2022-11-08 | 2023-03-28 | 安徽金力电气技术有限公司 | Lightning arrester monitoring device for monitoring leakage current |
| CN115865018A (en) * | 2022-11-18 | 2023-03-28 | 武汉光谷信息光电子创新中心有限公司 | Variable gain amplifier |
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| CN111708463A (en) * | 2020-06-29 | 2020-09-25 | 广州华欣电子科技有限公司 | Mixed signal processing device |
| CN115118163A (en) * | 2021-03-22 | 2022-09-27 | 广州视源电子科技股份有限公司 | Multi-output circuit, control method and power supply |
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