CN111181822B - Amplitude adjusting circuit for transmitting electrical signal and amplitude adjusting circuit for receiving electrical signal - Google Patents
Amplitude adjusting circuit for transmitting electrical signal and amplitude adjusting circuit for receiving electrical signal Download PDFInfo
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- CN111181822B CN111181822B CN201911414688.7A CN201911414688A CN111181822B CN 111181822 B CN111181822 B CN 111181822B CN 201911414688 A CN201911414688 A CN 201911414688A CN 111181822 B CN111181822 B CN 111181822B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40052—High-speed IEEE 1394 serial bus
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40052—High-speed IEEE 1394 serial bus
- H04L12/40071—Packet processing; Packet format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40052—High-speed IEEE 1394 serial bus
- H04L12/40078—Bus configuration
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Abstract
The invention discloses a sending electrical signal amplitude adjusting circuit, which comprises a first physical layer chip, a first coupling driving module, a first filtering module, a first gain adjusting module and a first LC module which are connected in sequence, wherein the first physical layer chip is used for acquiring a first signal; the first coupling driving module is used for carrying out coupling driving processing on a first signal sent by the first physical layer chip to obtain a second signal; the first filtering module is used for removing the direct current common mode signal in the second signal to obtain a third signal; the first gain adjusting module is used for performing gain adjustment processing on the third signal according to a first preset value and a fifth signal output by the first LC module to obtain a fourth signal; the first LC module is used for increasing the driving capability of the fourth signal to obtain a fifth signal and feeding the fifth signal back to the first gain adjustment module. The amplitude adjustment circuit for transmitting electrical signals of the present invention improves the electrical performance of electrical signals transmitted by a 1394 bus.
Description
Technical Field
The invention belongs to the technical field of SMT (surface mount technology) mounting, and particularly relates to an amplitude adjusting circuit for sending electrical signals and an amplitude adjusting circuit for receiving electrical signals.
Background
The 1394 bus protocol is locally defined in accordance with the SAE AS5643 standard (overall: SAE AS 5643: 1394b interface requirements for military and aircraft applications) to meet the aeronautical requirements for high reliability, low latency, and certainty.
The 1394 bus interface implementation mainly comprises a protocol layer chip, a link layer chip, a physical layer chip, a coupling transformer and a transmission cable. The bus transmission mainly depends on a physical layer chip to encode parallel data into serial 1394 data, and the serial 1394 data is transmitted on a special cable after being coupled by a 1394 bus signal special transformer. The 1394 electrical signals are driven according to a physical layer chip and a special transformer, wherein the special transformer can only perform 1: 1 level conversion.
However, in the existing method, when attenuation occurs in the transmission process of the 1394 bus signal, the 1394 bus signal cannot be compensated, and the amplitude of the 1394 bus signal cannot be adjusted to adapt to the electrical characteristics of the bus.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a transmitting electrical signal amplitude adjusting circuit and a receiving electrical signal amplitude adjusting circuit. The technical problem to be solved by the invention is realized by the following technical scheme:
an amplitude adjusting circuit for sending electrical signals comprises a first physical layer chip, a first coupling driving module, a first filtering module, a first gain adjusting module and a first LC module which are connected in sequence, wherein the output end of the first LC module is also connected with the first gain adjusting module,
the first physical layer chip is used for acquiring a first signal;
the first coupling driving module is used for carrying out coupling driving processing on a first signal sent by the first physical layer chip to obtain a second signal;
the first filtering module is used for removing the direct current common mode signal in the second signal to obtain a third signal;
the first gain adjusting module is used for performing gain adjustment processing on the third signal according to a first preset value and a fifth signal output by the first LC module to obtain a fourth signal;
the first LC module is used for increasing the driving capability of the fourth signal to obtain the fifth signal and feeding the fifth signal back to the first gain adjustment module.
In one embodiment of the present invention, the first filtering module includes a capacitor C1 and a capacitor C2, wherein,
first ends of the capacitor C1 and the capacitor C2 are respectively connected with the first coupling driving module, and second ends of the capacitor C1 and the capacitor C2 are respectively connected with the first gain adjusting module.
In one embodiment of the invention, the first LC module includes a capacitor C3, a capacitor C4, an inductor L1, and an inductor L2, wherein,
the first ends of the capacitor C3 and the capacitor C4 are respectively connected to the first gain adjustment module, the first end of the capacitor C3 is further connected to the first end of the inductor L1, the first end of the capacitor C4 is further connected to the first end of the inductor L2, and the second ends of the inductor L1 and the inductor L2 are connected to the power supply terminal VDD.
In an embodiment of the present invention, the apparatus further includes a first signal feedback module, a first processing module, and a first signal conversion module, a first terminal of the first signal feedback module is connected to the second terminals of the capacitor C3 and the capacitor C4, a second terminal of the first signal feedback module is connected to the first terminal of the first processing module, a second terminal of the first processing module is connected to the first terminal of the first signal conversion module, and a second terminal of the first signal conversion module is connected to the first gain adjustment module, wherein,
the first signal feedback module is used for acquiring a fifth signal and converting the fifth signal into a first digital signal;
the first processing module is used for comparing the first digital signal with a first preset value to obtain a second digital signal;
the first signal conversion module is used for converting the second digital signal into a sixth signal, and the first gain adjustment module performs gain adjustment processing on the third signal according to the sixth signal.
In one embodiment of the invention, the first signal feedback module comprises a first operational amplifier, a first ADC, wherein,
the second ends of the capacitor C3 and the capacitor C4 are respectively connected with the first operational amplifier, and the first operational amplifier is connected with the first processing module through the first ADC.
An embodiment of the present invention further provides a received electrical signal amplitude adjusting circuit, which includes a second filtering module, a second gain adjusting module, a second LC module, a second coupling driving module, and a second physical layer chip, which are connected in sequence, wherein an output end of the second LC module is further connected to the second gain adjusting module,
the second filtering module is used for receiving a seventh signal and removing a direct-current common mode signal in the seventh signal to obtain an eighth signal;
the second gain adjustment module is used for performing gain adjustment processing on the eighth signal according to a second preset value and a tenth signal output by the second LC module to obtain a ninth signal;
the second LC module is used for increasing the driving capability of the ninth signal to obtain a tenth signal;
the second coupling driving module is used for performing coupling driving processing on the tenth signal to obtain an eleventh signal;
the second physical layer chip is used for receiving the eleventh signal.
In one embodiment of the invention, the second filtering module comprises a capacitor C5 and a capacitor C6, wherein,
the capacitor C5 and the capacitor C6 are both connected to the second gain adjustment module.
In one embodiment of the invention, the second LC module includes a capacitor C7, a capacitor C8, an inductor L3, and an inductor L4, wherein,
the first ends of the capacitor C7 and the capacitor C8 are respectively connected to the gain adjustment module, the second ends of the capacitor C7 and the capacitor C8 are respectively connected to the second coupling driving module, the second end of the capacitor C7 is further connected to the first end of the inductor L3, the second end of the capacitor C8 is further connected to the first end of the inductor L4, and the second ends of the inductor L3 and the inductor L4 are connected to the power supply terminal.
In an embodiment of the present invention, the apparatus further includes a second signal feedback module, a second processing module, and a second signal conversion module, a first end of the second signal feedback module is connected to the second ends of the capacitor C7 and the capacitor C8, a second end of the second signal feedback module is connected to the first end of the second processing module, a second end of the second processing module is connected to the first end of the second signal conversion module, and a second end of the second signal conversion module is connected to the second gain adjustment module, wherein,
the second signal feedback module is used for acquiring a tenth signal and converting the tenth signal into a third digital signal;
the second processing module is used for comparing the third digital signal with the second preset value to obtain a fourth digital signal;
the second signal conversion module is configured to convert the fourth digital signal into a twelfth signal, and the second gain adjustment module performs gain adjustment processing on the tenth signal according to the twelfth signal.
In one embodiment of the invention, the second signal feedback module comprises a second operational amplifier, a third ADC, wherein,
second ends of the capacitor C7 and the capacitor C8 are respectively connected to the second operational amplifier, and the second operational amplifier is connected to the second processing module through the third ADC.
The invention has the beneficial effects that:
the amplitude adjusting circuit for sending the electrical signals removes the DC common mode signals of the second signals after coupling driving by using the first filtering module so as to obtain third signals, and performs gain adjustment on the third signals by using the first gain adjusting module according to the first preset value and the third signals so as to obtain fourth signals, so that the electrical signals sent by the 1394 bus can be compensated, the purpose of adjusting the amplitude of the electrical signals sent by the 1394 bus is achieved, and then the driving capability is increased by using the first LC module, so that the electrical performance of the electrical signals sent by the 1394 bus is finally improved.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of a transmitting electrical signal amplitude adjusting circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another transmit electrical signal amplitude adjustment circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a further transmit electrical signal amplitude adjustment circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a received electrical signal amplitude adjustment circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another received electrical signal amplitude adjustment circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another received electrical signal amplitude adjustment circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of a transmitting electrical signal amplitude adjusting circuit according to an embodiment of the present invention. The embodiment of the invention provides a sending electrical signal amplitude adjusting circuit. The transmission electrical signal amplitude adjustment circuit may specifically include: the first physical layer chip, the first coupling driving module, the first filtering module, the first gain adjusting module and the first LC module are connected in sequence, the output end of the first LC module is also connected with the first gain adjusting module, wherein,
the first physical layer chip is used for driving an electrical signal sent by the 1394 bus to obtain a first signal, and the first physical layer chip is the 1394PHY (physical layer);
the first coupling driving module is used for carrying out coupling driving processing on a first signal sent by the first physical layer chip to obtain a second signal;
the first filtering module is used for removing the direct current common mode signal in the second signal to obtain a third signal;
the first gain adjusting module is used for performing gain adjustment processing on the third signal according to a first preset value and a fifth signal output by the first LC module to obtain a fourth signal;
the first LC module is used for increasing the driving capability of the fourth signal to obtain a fifth signal and feeding the fifth signal back to the first gain adjustment module.
That is, first, an electrical signal of the 1394 bus interface is driven by the first physical layer chip to obtain a first signal, the first physical layer chip transmits the first signal to the first coupling driving module for coupling driving processing to obtain a second signal, the first coupling driving module transmits the second signal to the first filtering module, the first filtering module performs filtering processing on the received second signal to remove a dc common mode signal in the second signal to obtain a third signal, the first filtering module transmits the third signal to the first gain adjusting module, the first gain adjusting module compares a voltage value of a fifth signal fed back by the first LC module with a first preset value, if the voltage value of the fifth signal is greater than the first preset value, the first gain adjusting module is used to reduce the voltage value of the third signal to the first preset value, if the voltage value of the fifth signal is less than the first preset value, the voltage value of the third signal is adjusted to a first preset value by using the first gain adjustment module, wherein the first preset value is determined according to the voltage value of the fifth signal that the amplitude adjustment circuit of the transmitted electrical signal finally needs to output, that is, the first preset value should be the same as the voltage value of the fifth signal that the amplitude adjustment circuit of the transmitted electrical signal finally needs to output, so that the electrical signal transmitted by the 1394 bus can be compensated by the first gain adjustment module in this embodiment, so as to achieve the purpose of adjusting the amplitude of the electrical signal transmitted by the 1394 bus, then the first gain adjustment module transmits the obtained fourth signal to the first LC module, the first LC module increases the driving capability of the fourth signal, so as to obtain the fifth signal, the amplitude adjustment circuit of the transmitted electrical signal in this embodiment can maximize the signal swing, eliminate the common mode noise, and minimize the distortion, and meanwhile, the parasitic feed-forward risk caused by parasitic coupling under the conditions of low gain and high frequency can be reduced. In addition, the transmitting electrical signal amplitude adjusting circuit of the embodiment may further detect a limit of a receiving capability of a node that receives the fifth signal, that is, adjust the voltage value of the fifth signal to the limit of the receiving capability of the node through the first gain adjusting module, so as to detect the limit of the receiving capability of the node, thereby evaluating the adaptability of the 1394 bus interface.
Preferably, the first gain adjustment module may be, for example, a voltage controlled variable gain amplifier/attenuator, model number ADL5331, suitable for applications with frequencies up to 1.2 GHz.
Preferably, the first coupling driving module may be a transformer suitable for the 1394 bus, and the transformer is used to perform coupling driving processing on the first signal sent by the first physical layer chip, so as to obtain the second signal.
Referring to fig. 1 and fig. 2, in an embodiment, the first filtering module includes a capacitor C1 and a capacitor C2, wherein first terminals of the capacitor C1 and the capacitor C2 are respectively connected to the output terminal of the first coupling driving module, that is, first terminals of the capacitor C1 and the capacitor C2 are respectively connected to the transformer, and second terminals of the capacitor C1 and the capacitor C2 are respectively connected to the first gain adjusting module, that is, second terminals of the capacitor C1 and the capacitor C2 are respectively connected to the input terminal of the first gain adjusting module. In the embodiment, the capacitor C1 and the capacitor C2 are used to remove the dc common mode signal in the second signal transmitted by the transformer, so as to obtain a third signal.
Referring to fig. 1 and fig. 2, in an embodiment, the first LC module includes a capacitor C3, a capacitor C4, an inductor L1, and an inductor L2, wherein first terminals of the capacitor C3 and the capacitor C4 are respectively connected to the output terminal of the first gain adjustment module, a first terminal of the capacitor C3 is further connected to a first terminal of the inductor L1, a first terminal of the capacitor C4 is further connected to a first terminal of the inductor L2, and second terminals of the inductor L1 and the inductor L2 are connected to a power source terminal VDD. The driving capability of the fourth signal output by the first gain adjustment module is increased by the capacitor C3, the capacitor C4, the inductor L1 and the inductor L2.
Referring to fig. 2 and 3, the amplitude adjusting circuit for transmitting electrical signals further includes a first signal feedback module, a first processing module and a first signal conversion module, wherein a first end of the first signal feedback module is connected to an output end of the first LC module, that is, a first end of the first signal feedback module is respectively connected to second ends of the capacitor C3 and the capacitor C4, a second end of the first signal feedback module is connected to the first end of the first processing module, a second end of the first processing module is connected to the first end of the first signal conversion module, and a second end of the first signal conversion module is connected to the GAIN interface of the first GAIN adjusting module, wherein,
the first signal feedback module is used for acquiring a fifth signal and converting the fifth signal into a first digital signal;
the first processing module is used for comparing the first digital signal with a first preset value to obtain a second digital signal;
the first signal conversion module is used for converting the second digital signal into a sixth signal, and the first gain adjustment module performs gain adjustment processing on the third signal according to the sixth signal.
Specifically, in this embodiment, the fifth signal obtained by the first LC module is fed back to the first signal feedback module, the first signal feedback module converts the fifth signal into a first digital signal, and sends the first digital signal to the first processing module, the first processing module compares the first digital signal with a first preset value to obtain a second digital signal after comparison, where the second digital signal is an absolute value of a difference between the first digital signal and the first preset value, and if the first digital signal is greater than or less than the first preset value, it indicates that the fifth signal output by the amplitude adjustment circuit for sending the electrical signal does not satisfy the requirement, the first signal conversion module is required to convert the second digital signal into a sixth signal, and the first gain adjustment module performs gain adjustment processing on the third signal according to a voltage value of the sixth signal until the fifth signal output by the amplitude adjustment circuit for sending the electrical signal satisfies the requirement, therefore, the accuracy of the final fifth signal of the electric signal amplitude regulating circuit can be ensured.
Referring to fig. 2, the first signal feedback module further includes a first operational amplifier and a first ADC (Analog to Digital Converter), wherein second ends of the capacitor C3 and the capacitor C4 are respectively connected to an input end of the first operational amplifier, an output end of the first operational amplifier is connected to the first processing module through the first ADC, and the first ADC is connected to the first processing module through the SPI. In this embodiment, the fifth signal is first amplified by the first operational amplifier, and then the amplified fifth signal is converted into the first digital signal by the first ADC.
Preferably, the first processing module comprises an MCU (Microcontroller Unit).
Preferably, the first signal conversion module includes a second ADC (Analog to Digital Converter), and the second ADC is connected to the first processing module through the SPI.
The sending electrical signal amplitude adjusting circuit of the embodiment can optimize 1394 bus signals, so that the electrical characteristics of the 1394 bus signals are improved. In addition, the limit of the receiving capability of a node for receiving the output signal of the electrical signal amplitude adjusting circuit can be detected by adjusting the electrical characteristics of the output signal of the electrical signal amplitude adjusting circuit, so that the adaptability of the 1394 bus interface can be evaluated.
Example two
Referring to fig. 4, fig. 4 is a schematic structural diagram of a received electrical signal amplitude adjusting circuit according to an embodiment of the present invention. The embodiment of the invention provides a received electrical signal amplitude adjusting circuit. The received electrical signal amplitude adjustment circuit may specifically include: the second filtering module, the second gain adjusting module, the second LC module, the second coupling driving module and the second physical layer chip are connected in sequence, the output end of the second LC module is also connected with the second gain adjusting module, wherein,
the second filtering module is used for receiving the seventh signal and removing the direct-current common-mode signal in the seventh signal to obtain an eighth signal;
the second gain adjustment module is used for performing gain adjustment processing on the eighth signal according to a second preset value and the tenth signal output by the second LC module to obtain a ninth signal;
the second LC module is used for increasing the driving capability of the ninth signal to obtain a tenth signal;
the second coupling driving module is used for carrying out coupling driving processing on the tenth signal to obtain an eleventh signal;
the second physical layer chip is configured to receive the eleventh signal, so as to output the eleventh signal through the second physical layer chip, where the second physical layer chip is the 1394PHY (physical layer).
Specifically, a node sends a seventh signal to a second filtering module, and removes a dc common mode signal in the seventh signal, so as to obtain an eighth signal, the second filtering module transmits the eighth signal to a second gain adjusting module, the second gain adjusting module compares a voltage value of a tenth signal fed back by a second LC module with a second preset value, if the voltage value of the tenth signal is greater than the second preset value, the voltage value of the eighth signal is adjusted to a second preset value by using the second gain adjusting module, if the voltage value of the tenth signal is less than the second preset value, the voltage value of the eighth signal is adjusted to a second preset value by using the second gain adjusting module, wherein the second preset value is determined according to a voltage value of an eleventh signal that is finally required to be output by a received electrical signal amplitude adjusting circuit, that is, the second preset value should be the same as the voltage value of the eleventh signal that is finally required to be output by the received electrical signal amplitude adjusting circuit, therefore, in this embodiment, the second gain adjustment module can compensate the electrical signal sent by a certain node through the 1394 bus, so as to achieve the purpose of adjusting the amplitude of the electrical signal sent by the node through the 1394 bus, the eighth signal is subjected to gain adjustment processing by the second gain adjustment module to obtain a ninth signal, after the second LC module receives the ninth signal, the second LC module can increase the driving capability of the ninth signal to obtain a tenth signal, the second LC module transmits the tenth signal to the second coupling driving module, the second coupling driving module performs coupling driving processing on the tenth signal to obtain an eleventh signal, and the second coupling driving module transmits the eleventh signal to the second physical layer chip, so that the eleventh signal is driven and output through the second physical layer chip. The amplitude adjusting circuit for the received electrical signal can enable the signal swing to be maximum, eliminate common-mode noise, reduce distortion to be minimum, and reduce parasitic feedforward risks caused by parasitic coupling under the conditions of low gain and high frequency. In addition, the received electrical signal amplitude adjusting circuit of the embodiment may further detect a limit of a receiving capability of a node receiving the eleventh signal, that is, adjust a voltage value of the eleventh signal to the limit of the receiving capability of the node through the second gain adjusting module, so as to detect the limit of the receiving capability of the node, thereby evaluating the adaptability of the 1394 bus interface.
Preferably, the second gain adjustment module may be, for example, a voltage controlled variable gain amplifier/attenuator, model number ADL5331, suitable for applications with frequencies up to 1.2 GHz.
Preferably, the second coupling driving module may be a transformer adapted to the 1394 bus, and the transformer is used to perform coupling driving processing on the tenth signal sent by the second LC module, so as to obtain the eleventh signal.
Referring to fig. 4 and 5, in an embodiment, the second filtering module includes a capacitor C5 and a capacitor C6, wherein first terminals of the capacitor C5 and the capacitor C6 are both connected to an input terminal of the second gain adjustment module, and second terminals of the capacitor C5 and the capacitor C6 are connected to a sender of the seventh signal. In this embodiment, the capacitor C5 and the capacitor C6 are used to remove the dc common mode signal in the seventh signal to obtain the eighth signal.
Referring to fig. 4 and 5, in an embodiment, the second LC module includes a capacitor C7, a capacitor C8, an inductor L3, and an inductor L4, wherein first terminals of the capacitor C7 and the capacitor C8 are respectively connected to the output terminal of the second gain adjustment module, second terminals of the capacitor C7 and the capacitor C8 are respectively connected to the input terminal of the second coupling driving module, a second terminal of the capacitor C7 is further connected to a first terminal of the inductor L3, a second terminal of the capacitor C8 is further connected to a first terminal of the inductor L4, and second terminals of the inductor L1 and the inductor L2 are connected to the power source terminal VDD. In the present embodiment, the driving capability of the ninth signal output by the second gain adjustment module is increased through the capacitor C7, the capacitor C8, the inductor L3 and the inductor L4.
Referring to fig. 5 and 6, the amplitude adjusting circuit for receiving the electrical signal further includes a second signal feedback module, a second processing module and a second signal converting module, wherein a first end of the second signal feedback module is connected to the output end of the second LC module, that is, a first end of the second signal feedback module is connected to the second ends of the capacitor C7 and the capacitor C8, a second end of the second signal feedback module is connected to the first end of the second processing module, a second end of the second processing module is connected to the first end of the second signal converting module, and a second end of the second signal converting module is connected to the GAIN interface of the second GAIN adjusting module, wherein,
the second signal feedback module is used for acquiring a tenth signal and converting the tenth signal into a third digital signal;
the second processing module is used for comparing the third digital signal with a second preset value to obtain a fourth digital signal;
the second signal conversion module is used for converting the fourth digital signal into a twelfth signal, and the second gain adjustment module performs gain adjustment processing on the tenth signal according to the twelfth signal.
Specifically, in this embodiment, the tenth signal obtained by the second LC module is fed back to the second signal feedback module, the second signal feedback module converts the tenth signal into a third digital signal, and sends the third digital signal to the second processing module, the second processing module compares the third digital signal with a second preset value, so as to obtain a fourth digital signal after comparison, where the fourth digital signal is an absolute value of a difference between the third digital signal and the second preset value, and if the third digital signal is greater than or less than the second preset value, it indicates that the eleventh signal output by the amplitude adjustment circuit of the received electrical signal does not satisfy the requirement, the second signal conversion module is required to convert the fourth digital signal into the twelfth signal, and the second gain adjustment module performs gain adjustment processing on the eighth signal according to a voltage value of the twelfth signal until the eleventh signal output by the amplitude adjustment circuit of the received electrical signal satisfies the requirement, therefore, the accuracy of receiving the final eleventh signal of the electric signal amplitude regulating circuit can be ensured.
Referring to fig. 5, the second signal feedback module further includes a second operational amplifier and a third ADC (Analog-to-Digital Converter), wherein second ends of the capacitor C7 and the capacitor C8 are respectively connected to an input end of the second operational amplifier, the second operational amplifier is connected to the second processing module through the third ADC, and the third ADC is connected to the second processing module through the SPI. In this embodiment, the tenth signal is first amplified by the second operational amplifier, and then the amplified tenth signal is converted into the third digital signal by the third ADC.
Preferably, the second processing module comprises an MCU (Microcontroller Unit).
Preferably, the second signal conversion module includes a fourth ADC (Analog to Digital Converter), and the fourth ADC is connected to the second processing module through the SPI.
The received electrical signal amplitude adjusting circuit of the embodiment can optimize the signal received by the 1394 bus, thereby improving the electrical characteristics of the signal received by the 1394 bus. In addition, the limit of the receiving capacity of a receiver receiving the output signal of the electrical signal amplitude adjusting circuit can be detected by adjusting the electrical characteristics of the output signal of the electrical signal amplitude adjusting circuit, so that the receiving capacity of the 1394 bus interface can be evaluated.
In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "connected" are to be construed broadly and may, for example, be directly connected or indirectly connected through intervening media. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. A sending electrical signal amplitude adjusting circuit is characterized by comprising a first physical layer chip, a first coupling driving module, a first filtering module, a first gain adjusting module and a first LC module which are sequentially connected, wherein the output end of the first LC module is also connected with the first gain adjusting module,
the first physical layer chip is used for acquiring a first signal;
the first coupling driving module is used for carrying out coupling driving processing on a first signal sent by the first physical layer chip to obtain a second signal;
the first filtering module is used for removing the direct current common mode signal in the second signal to obtain a third signal;
the first gain adjusting module is used for comparing a voltage value of a fifth signal output by the first LC module with a first preset value, if the voltage value of the fifth signal is greater than the first preset value, the voltage value of the third signal is adjusted to be smaller than the first preset value to obtain a fourth signal, and if the voltage value of the fifth signal is smaller than the first preset value, the voltage value of the third signal is adjusted to be larger than the first preset value to obtain a fourth signal, wherein the first preset value is the same as the voltage value of the fifth signal which is finally required to be output by the sending electric signal amplitude adjusting circuit;
the first LC module is used for increasing the driving capability of the fourth signal to obtain a fifth signal and feeding the fifth signal back to the first gain adjustment module;
the sending electrical signal amplitude adjusting circuit further comprises a first signal feedback module, a first processing module and a first signal conversion module, wherein a first end of the first signal feedback module is connected to the second ends of the capacitor C3 and the capacitor C4, a second end of the first signal feedback module is connected to the first end of the first processing module, a second end of the first processing module is connected to the first end of the first signal conversion module, and a second end of the first signal conversion module is connected to the first gain adjusting module, wherein,
the first signal feedback module is used for acquiring a fifth signal and converting the fifth signal into a first digital signal;
the first processing module is used for comparing the first digital signal with a first preset value to obtain a second digital signal, wherein the second digital signal is an absolute value of a difference value between the first digital signal and the first preset value;
the first signal conversion module is used for converting the second digital signal into a sixth signal, and the first gain adjustment module performs gain adjustment processing on the third signal according to the sixth signal.
2. The transmit electrical signal amplitude adjustment circuit of claim 1, wherein the first filtering module comprises a capacitor C1 and a capacitor C2, wherein,
first ends of the capacitor C1 and the capacitor C2 are respectively connected with the first coupling driving module, and second ends of the capacitor C1 and the capacitor C2 are respectively connected with the first gain adjusting module.
3. The transmit electrical signal amplitude adjustment circuit of claim 1, wherein the first LC module comprises a capacitance C3, a capacitance C4, an inductance L1, and an inductance L2, wherein,
the first ends of the capacitor C3 and the capacitor C4 are respectively connected to the first gain adjustment module, the first end of the capacitor C3 is further connected to the first end of the inductor L1, the first end of the capacitor C4 is further connected to the first end of the inductor L2, and the second ends of the inductor L1 and the inductor L2 are connected to the power supply terminal VDD.
4. The transmit electrical signal amplitude adjustment circuit of claim 1, wherein the first signal feedback module comprises a first operational amplifier, a first ADC, wherein,
the second ends of the capacitor C3 and the capacitor C4 are respectively connected with the first operational amplifier, and the first operational amplifier is connected with the first processing module through the first ADC.
5. An amplitude adjusting circuit for receiving electrical signals is characterized by comprising a second filtering module, a second gain adjusting module, a second LC module, a second coupling driving module and a second physical layer chip which are sequentially connected, wherein the output end of the second LC module is also connected with the second gain adjusting module,
the second filtering module is used for receiving a seventh signal and removing a direct-current common mode signal in the seventh signal to obtain an eighth signal;
the second gain adjustment module is configured to compare a voltage value of a tenth signal output by the second LC module with a second preset value, if the voltage value of the tenth signal is greater than the second preset value, adjust the voltage value of the eighth signal to a second preset value to obtain a ninth signal, and if the voltage value of the tenth signal is less than the second preset value, adjust the voltage value of the eighth signal to the second preset value to obtain a ninth signal, where the second preset value is the same as a voltage value of an eleventh signal that the received electrical signal amplitude adjustment circuit finally needs to output;
the second LC module is used for increasing the driving capability of the ninth signal to obtain a tenth signal;
the second coupling driving module is used for performing coupling driving processing on the tenth signal to obtain an eleventh signal;
the second physical layer chip is used for receiving the eleventh signal;
the received electrical signal amplitude adjusting circuit further comprises a second signal feedback module, a second processing module and a second signal conversion module, wherein a first end of the second signal feedback module is connected to the second ends of the capacitor C7 and the capacitor C8, a second end of the second signal feedback module is connected to the first end of the second processing module, a second end of the second processing module is connected to the first end of the second signal conversion module, and a second end of the second signal conversion module is connected to the second gain adjusting module, wherein,
the second signal feedback module is used for acquiring a tenth signal and converting the tenth signal into a third digital signal;
the second processing module is configured to compare the third digital signal with the second preset value to obtain a fourth digital signal, where the fourth digital signal is an absolute value of a difference between the third digital signal and the second preset value;
the second signal conversion module is configured to convert the fourth digital signal into a twelfth signal, and the second gain adjustment module performs gain adjustment processing on the tenth signal according to the twelfth signal.
6. The received electrical signal amplitude adjustment circuit of claim 5, wherein the second filtering module includes a capacitor C5 and a capacitor C6, wherein,
the capacitor C5 and the capacitor C6 are both connected to the second gain adjustment module.
7. The received electrical signal amplitude conditioning circuit of claim 5, wherein the second LC module comprises a capacitance C7, a capacitance C8, an inductance L3, and an inductance L4, wherein,
first ends of the capacitor C7 and the capacitor C8 are respectively connected to the second gain adjustment module, second ends of the capacitor C7 and the capacitor C8 are respectively connected to the second coupling driving module, a second end of the capacitor C7 is further connected to a first end of the inductor L3, a second end of the capacitor C8 is further connected to a first end of the inductor L4, and second ends of the inductor L3 and the inductor L4 are connected to the power supply terminal.
8. The received electrical signal amplitude adjustment circuit of claim 5, wherein the second signal feedback module comprises a second operational amplifier, a third ADC, wherein,
second ends of the capacitor C7 and the capacitor C8 are respectively connected to the second operational amplifier, and the second operational amplifier is connected to the second processing module through the third ADC.
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| CN201911414688.7A CN111181822B (en) | 2019-12-31 | 2019-12-31 | Amplitude adjusting circuit for transmitting electrical signal and amplitude adjusting circuit for receiving electrical signal |
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| CN201911414688.7A CN111181822B (en) | 2019-12-31 | 2019-12-31 | Amplitude adjusting circuit for transmitting electrical signal and amplitude adjusting circuit for receiving electrical signal |
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| CN111181822B true CN111181822B (en) | 2022-03-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207819862U (en) * | 2017-11-27 | 2018-09-04 | 南京信息工程大学 | A kind of broad band amplifier of the adjustable gain of single supply power supply |
| CN109245530A (en) * | 2018-08-14 | 2019-01-18 | 华为技术有限公司 | It is a kind of for stablizing the circuit and power adapter of output signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207819862U (en) * | 2017-11-27 | 2018-09-04 | 南京信息工程大学 | A kind of broad band amplifier of the adjustable gain of single supply power supply |
| CN109245530A (en) * | 2018-08-14 | 2019-01-18 | 华为技术有限公司 | It is a kind of for stablizing the circuit and power adapter of output signal |
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