CN113691327B - Hybrid circuit for wired communication and calibration method thereof - Google Patents
Hybrid circuit for wired communication and calibration method thereof Download PDFInfo
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- CN113691327B CN113691327B CN202111244328.4A CN202111244328A CN113691327B CN 113691327 B CN113691327 B CN 113691327B CN 202111244328 A CN202111244328 A CN 202111244328A CN 113691327 B CN113691327 B CN 113691327B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
Abstract
The invention relates to a mixed circuit of wired communication and a calibration method thereof, comprising a first connecting end and a second connecting end of a signal transceiving circuit; the transmitting anode is connected with the first connecting end through a first adjustable capacitor; the emitting cathode is connected with the second adjustable capacitor between the emitting cathode and the second connecting end; the first digital-to-analog converter is connected with the first connecting end and the second connecting end and respectively adjusts the current to the first connecting end and the second connecting end under the action of a clock signal; and the second digital-to-analog converter is connected with the transmitting anode and the transmitting cathode and respectively adjusts the current to the transmitting anode and the current to the transmitting cathode under the action of the delay signal of the clock signal. According to the invention, a first adjustable capacitor is arranged between a first connecting end and a receiving positive electrode of a signal transceiving circuit, and a second adjustable capacitor is arranged between a second connecting end and a receiving negative electrode so as to calibrate delay difference; meanwhile, bandwidth mismatch is calibrated by adjusting the delay signal of the clock signal, so that the invalid signal of the hybrid circuit is optimal.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a hybrid circuit for wired communications and a calibration method thereof.
Background
In the field of communications, full-duplex (full-duplex) technology allows a communication device to transmit and receive simultaneously over the same channel; however, due to incomplete impedance matching, the transmitted signal may be partially reflected and doped in the received signal, which may affect the performance of the received signal.
If the same pair of lines is used for data transceiving, certain measures must be taken to separate strong near-end transmission signals from weak signals received at a far end, otherwise, the received signals can be damaged. For providing circuits to separate the received signal from the transmitted signal, these circuits are called Hybrid circuits (hybrids).
If the communication device uses differential signals for communication, that is, the communication device transmits the positive end signal and the negative end signal of the differential signal in the same channel, the difference between the transmission path for transmitting the positive end signal and the transmission path for transmitting the negative end signal in the same channel, which causes a phase difference between the positive end signal and the negative end signal, and thus a delay difference (skew) of the differential pair, is not considered in detail in the prior art, which may cause a part of the transmitted differential signal to become electromagnetic interference noise, and thus the performance of the hybrid circuit is low.
Disclosure of Invention
In view of the above problems, the present invention provides a hybrid circuit for wired communication and a calibration method thereof.
A mixed circuit for wired communication comprises a first connecting end and a second connecting end of a signal transceiving circuit; the receiving anode is connected with the first connecting end through a first resistor, and two ends of the first resistor are connected with a first adjustable capacitor; a receiving negative electrode, a second resistor is connected between the receiving negative electrode and the second connecting end, and two ends of the second resistor are connected with a second adjustable capacitor; a third resistor and a fourth resistor are connected between the first connecting end and the second connecting end; the first digital-to-analog converter is connected with the first connecting end and the second connecting end and respectively adjusts the current to the first connecting end and the second connecting end under the action of a clock signal; and the second digital-to-analog converter is connected with the receiving positive electrode and the receiving negative electrode and respectively adjusts the current to the receiving positive electrode and the receiving negative electrode under the action of the delay signal of the clock signal.
In the hybrid circuit for wired communication according to the present invention, a point at which the third resistor and the fourth resistor are connected is connected to a power supply voltage.
According to the hybrid circuit for wired communication, the first connecting end is connected with a common mode inductor through a first capacitor, the second connecting end is connected with the common mode inductor through a second capacitor, and the common mode inductor is connected with an opposite end signal receiving and transmitting circuit.
According to the wired communication hybrid circuit, the first connecting end and the second connecting end are connected with the transformer, the center tap of the transformer is connected with a power supply voltage, and the transformer is connected with the opposite-end signal receiving and transmitting circuit.
In the hybrid circuit for wired communication according to the present invention, a ratio of currents flowing to the first connection terminal and the second connection terminal of the first digital-to-analog converter is 8: 1 or 1: 8.
the invention also provides a calibration method of a hybrid circuit for wired communication, which is applied to the hybrid circuit for wired communication, and the method comprises the following steps: step S1, continuously sending a high frequency signal, and adjusting a delay difference between the positive receiving terminal and the negative receiving terminal by adjusting a delay signal of the clock signal under the action of a first detection signal; and step S2, compensating for a bandwidth error between the receiving positive pole and the receiving negative pole by adjusting the phases of the first adjustable capacitor and the second adjustable capacitor.
The method for calibrating a hybrid circuit for wired communication according to the present invention, after step S2, further includes: and step S3, iterating steps S1-S2 repeatedly until the invalidation signal of the hybrid circuit is optimal.
The method for calibrating a hybrid circuit for wired communication according to the present invention, before the step S1, further includes: step S0, sending a low frequency signal, and adjusting the current of the first digital-to-analog converter and the current of the second digital-to-analog converter under the action of a second detection signal, respectively, to calibrate the first digital-to-analog converter and the second digital-to-analog converter.
In the method for calibrating a hybrid circuit for wired communication according to the present invention, in the step S1 and the step S2, the positive reception electrode and the negative reception electrode detect a residual echo of a high frequency signal transmitted by the signal transmission/reception circuit, and output the first detection signal.
In the method for calibrating a hybrid circuit for wired communication according to the present invention, in step S0, the positive receiving electrode and the negative receiving electrode detect a residual echo of a low frequency signal transmitted by the signal transmission/reception circuit, and output the second detection signal.
Has the advantages that: the delay difference is calibrated by arranging a first adjustable capacitor between a first connecting end MDIP and a receiving positive electrode of a signal transceiving circuit and arranging a second adjustable capacitor between a second connecting end MDIN and a receiving negative electrode; meanwhile, the bandwidth mismatch is calibrated by adjusting the delay signal of the clock signal, so that the cancel signal (cancel) of the hybrid circuit is optimal.
Drawings
FIG. 1 is a schematic diagram of a first hybrid circuit embodiment of the present invention for wired communications;
FIG. 2 is a schematic diagram of a second hybrid circuit embodiment of the present invention for wired communications;
fig. 3 is a schematic diagram of a calibration method of a hybrid circuit for wired communication of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Example one
Referring to fig. 1, a hybrid circuit for wired communication, applied to an ethernet communication device, includes a first connection terminal MDIP and a second connection terminal MDIN of a signal transceiver circuit; a first resistor R1 is connected between the receiving positive electrode RXP and the first connection end MDIP, and two ends of the first resistor R1 are connected with a first adjustable capacitor C1; a second resistor R2 is connected between the receiving cathode RXN and the second connecting end MDIN, and two ends of the second resistor R2 are connected with a second adjustable capacitor C2; a third resistor R3 and a fourth resistor R4 are connected between the first connection end MDIP and the second connection end MDIN; the first digital-to-analog converter DAC11 is connected with the first connecting end MDIP and the second connecting end MDIN and respectively adjusts the current to the first connecting end MDIP and the second connecting end MDIN under the action of a clock signal CLK; the second digital-to-analog converter DAC12 is connected to the receiving anode RXP and the receiving cathode RXN, and respectively adjusts the currents to the receiving anode RXP and the receiving cathode RXN under the action of the delay signal of the clock signal CIK.
In the Hybrid circuit (Hybrid) of the invention, a first adjustable capacitor C1 is arranged between a first connecting end MDIP and a receiving anode RXP of a signal transceiving circuit, and a second adjustable capacitor C2 is arranged between a second connecting end MDIN and a receiving cathode RXP of the signal transceiving circuit, so as to calibrate delay difference skew; meanwhile, the bandwidth mismatch is calibrated by adjusting the delay signal of the clock signal, and the cancel signal cancel of the hybrid circuit can be optimized by repeatedly calibrating the delay difference and the bandwidth error.
In the hybrid circuit for wired communication, a transformer is connected between the first connection terminal MDIP and the second connection terminal MDIN, a central tap of the transformer is connected with a power supply voltage, the transformer is connected with an opposite-end signal transceiving circuit, and the power supply voltage is preferably 1.8V.
In the mixed circuit for wired communication, the ratio of the currents flowing to the first connecting end MDIP and the second connecting end MDIN of the first digital-to-analog converter DAC11 is 8: 1 or 1: 8.
preferably, the current ratio of the first digital-to-analog converter DAC11 to the second digital-to-analog converter DAC12 is about 9: 1, where the current of the first digital to analog converter DAC11 is divided into 9 parts, where 8 parts are distributed to one end and 1 part is distributed to the other end.
Furthermore, a fifth resistor R3 'and a sixth resistor R4' are connected to the transformer side.
Example two
Referring to fig. 2, a hybrid circuit for wired communication, applied to a vehicle-mounted communication device, includes a first connection terminal MDIP and a second connection terminal MDIN of a signal transceiving circuit; a first resistor R1 is connected between the receiving positive electrode RXP and the first connection end MDIP, and two ends of the first resistor R1 are connected with a first adjustable capacitor C1; a second resistor R2 is connected between the receiving cathode RXN and the second connecting end MDIN, and two ends of the second resistor R2 are connected with a second adjustable capacitor C2; a third resistor R3 and a fourth resistor R4 are connected between the first connection end MDIP and the second connection end MDIN; the first digital-to-analog converter DAC11 is connected with the first connecting end MDIP and the second connecting end MDIN and respectively adjusts the current to the first connecting end MDIP and the second connecting end MDIN under the action of a clock signal CLK; the second digital-to-analog converter DAC12 is connected to the receiving anode RXP and the receiving cathode RXN, and respectively adjusts the currents to the receiving anode RXP and the receiving cathode RXN under the action of the delay signal of the clock signal CIK.
In the wired communication hybrid circuit, the first connection terminal MDIP is connected with a common mode inductor 10 (CM hook) through a first capacitor C3, the second connection terminal MDIN is connected with the common mode inductor 10 through a second capacitor C4, and the common mode inductor 10 is connected with an opposite-end signal transceiver circuit.
In the hybrid circuit for wired communication of the present invention, a point at which the third resistor R3 and the fourth resistor R4 are connected is connected to a power supply voltage, preferably 3.3V.
In the mixed circuit for wired communication, the ratio of the currents flowing to the first connecting end MDIP and the second connecting end MDIN of the first digital-to-analog converter DAC11 is 8: 1 or 1: 8.
further, a fifth resistor R3 'and a sixth resistor R4' are connected to the common mode inductor 10 side.
Because the vehicle-mounted MDI has different structures, the hybrid circuit is correspondingly modified, compared with the hybrid circuit applied to the vehicle-mounted MDI in the Ethernet, the transformer is changed into a common mode inductor 10 by the hybrid circuit applied to the vehicle-mounted MDI, the common mode inductor 10 is connected with an opposite end signal transceiving circuit, and a capacitor is respectively additionally arranged on the common mode inductor 10 and a first connecting end MDIP and a second connecting end MDIN.
The present invention also provides a calibration method for a hybrid circuit for wired communication, which is applied to the hybrid circuit for wired communication in the first and second embodiments, and referring to fig. 3, the method includes: step S1, continuously sending a high frequency signal, and adjusting a delay signal of the clock signal to adjust a delay difference between the receiving positive electrode RXP and the receiving negative electrode RXN under the action of a first detection signal; in step S2, the phase of the first adjustable capacitor C1 and the second adjustable capacitor C2 are adjusted to compensate for the bandwidth error between the receiving positive electrode RXP and the receiving negative electrode RXN.
The method for calibrating a hybrid circuit for wired communication according to the present invention, after step S2, further includes: in step S3, the steps S1-S2 are iterated until the cancellation signal (cancel) of the hybrid circuit is optimized.
The method for calibrating a hybrid circuit for wired communication according to the present invention, before step S1, further includes: in step S0, a low frequency signal is sent to adjust the current of the first DAC11 and the current of the second DAC12 respectively under the action of a second detection signal to calibrate the first DAC11 and the second DAC 12.
In the method for calibrating a hybrid circuit for wired communication according to the present invention, in step S1 and step S2, residual echoes of high-frequency signals transmitted from a positive RXP and negative RXN detection signal transmitting/receiving circuit are received, and a first detection signal is output.
In the method for calibrating a hybrid circuit for wired communication according to the present invention, in step S0, a positive electrode RXP and a negative electrode RXN are received to detect a residual echo of a low-frequency signal transmitted from a signal transmitting/receiving circuit, and a second detection signal is output.
The capacitance can tend to be + ∞underlow-frequency signals, the delay difference skew speed between the receiving positive electrode RXP and the receiving negative electrode RXN is very slow and cannot be influenced, and the mismatch of the hybrid circuit is mainly reflected in the current mismatch of the first digital-to-analog converter DAC11 and the second digital-to-analog converter DAC 12; under high-frequency signals, the capacitance is a default value, and the mismatch at the moment is mainly reflected in bandwidth mismatch, namely, the bandwidths are different under different signals.
Specifically, in the calibration method of the hybrid circuit for wired communication of the present invention, a low frequency signal is sent first, a positive RXP and a negative RXN are received and sent, a residual echo of the low frequency signal is detected, the currents of the two digital-to-analog converters are adjusted according to the residual echo, and the calibration of the digital-to-analog converters is completed independently and respectively by adjusting the current bias; then sending a high-frequency signal, and calibrating the delay difference between a receiving positive electrode RXP and a receiving negative electrode RXN by changing the delay signal of the clock signal; since the current ratio of the first digital-to-analog converter DAC11 and the second digital-to-analog converter DAC12 is about 9: 1, different in size, the bandwidth error can be compensated by adjusting the first compensation capacitor C1 and the second compensation capacitor C2.
Further, since the adjustments in step S1 and step S2 are difficult to decouple, the capacitances are different, and the clock signal also has a delay difference skew, under high frequency signals, the cancellation signal (cancel) reflected in the hybrid circuit leaks, and the calibration of the delay difference and the bandwidth error may not be completed by performing step S1 and step S2 once, so that the cancellation signal (cancel) of the hybrid circuit can be optimized by repeating the iterative adjustments in steps S1 to S2.
The invention has the beneficial effects that: the delay difference is calibrated by arranging a first adjustable capacitor between a first connecting end MDIP and a receiving positive electrode of a signal transceiving circuit and arranging a second adjustable capacitor between a second connecting end MDIN and a receiving negative electrode; meanwhile, the bandwidth mismatch is calibrated by adjusting the delay signal of the clock signal, so that the cancel signal (cancel) of the hybrid circuit is optimal.
While the specification concludes with claims defining exemplary embodiments of particular structures for practicing the invention, it is believed that other modifications will be made in the spirit of the invention. While the above invention sets forth presently preferred embodiments, these are not intended as limitations.
Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to be within the intent and scope of the present invention.
Claims (8)
1. A hybrid circuit for wired communication is characterized by comprising a first connecting end and a second connecting end of a signal transceiving circuit;
the receiving anode is connected with the first connecting end through a first resistor, and two ends of the first resistor are connected with a first adjustable capacitor;
a receiving negative electrode, a second resistor is connected between the receiving negative electrode and the second connecting end, and two ends of the second resistor are connected with a second adjustable capacitor;
a third resistor and a fourth resistor are connected between the first connecting end and the second connecting end;
the first digital-to-analog converter is connected with the first connecting end and the second connecting end and respectively adjusts the current to the first connecting end and the second connecting end under the action of a clock signal;
the second digital-to-analog converter is connected with the receiving positive electrode and the receiving negative electrode and respectively adjusts the current to the receiving positive electrode and the receiving negative electrode under the action of the delay signal of the clock signal;
the current ratio of the first digital-to-analog converter to the second digital-to-analog converter is 9: 1;
the ratio of the current flowing to the first connection end and the current flowing to the second connection end of the first digital-to-analog converter is 8: 1 or 1: 8.
2. the hybrid circuit for wired communication according to claim 1, wherein a point at which the third resistor and the fourth resistor are connected is connected to a power supply voltage.
3. The hybrid circuit for wired communication according to claim 2, wherein the first connection terminal is connected to a common mode inductor through a first capacitor, the second connection terminal is connected to the common mode inductor through a second capacitor, and the common mode inductor is connected to the opposite terminal signal transceiver circuit.
4. The hybrid circuit for wired communication according to claim 1, wherein a transformer is connected between the first connection terminal and the second connection terminal, a center tap of the transformer is connected to a power supply voltage, and the transformer is connected to the opposite terminal signal transceiver circuit.
5. A method for calibrating a hybrid circuit for wired communication, which is applied to the hybrid circuit for wired communication according to any one of claims 1 to 4, the method comprising:
step S1, continuously sending a high frequency signal, and adjusting a delay difference between the positive receiving terminal and the negative receiving terminal by adjusting a delay signal of the clock signal under the action of a first detection signal;
step S2, compensating for a bandwidth error between the receiving positive pole and the receiving negative pole by adjusting phases of the first adjustable capacitor and the second adjustable capacitor;
and step S3, iterating steps S1-S2 repeatedly until the invalidation signal of the hybrid circuit is optimal.
6. The method for calibrating a hybrid circuit for wired communication according to claim 5, wherein said step S1 is preceded by the step of:
step S0, sending a low frequency signal, and adjusting the current of the first digital-to-analog converter and the current of the second digital-to-analog converter under the action of a second detection signal, respectively, to calibrate the first digital-to-analog converter and the second digital-to-analog converter.
7. The method of calibrating a hybrid circuit for wired communication according to claim 5, wherein the positive reception electrode and the negative reception electrode detect a residual echo of a high-frequency signal transmitted by the signal transmission/reception circuit and output the first detection signal in step S1 and step S2.
8. The method of calibrating a hybrid circuit for wired communication according to claim 6, wherein in step S0, the positive reception terminal and the negative reception terminal detect a residual echo of a low-frequency signal transmitted by the signal transmission/reception circuit and output the second detection signal.
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| EP2497341B1 (en) * | 2009-11-02 | 2018-09-12 | Genesys Global LLC | Electronic ballast circuit for lamps |
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| US9525428B2 (en) * | 2014-12-17 | 2016-12-20 | Analog Devices, Inc. | Randomly sampling reference ADC for calibration |
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| CN110138403A (en) * | 2018-02-06 | 2019-08-16 | 扬智科技股份有限公司 | Communication device and its echo removing method |
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| CN202663380U (en) * | 2012-07-14 | 2013-01-09 | 中科芯集成电路股份有限公司 | Circuit for automatically calibrating frequency of active remote control (RC) filter by utilizing capacitance delay characteristics |
| CN105591650A (en) * | 2015-12-18 | 2016-05-18 | 豪威科技(上海)有限公司 | Analog-to-digital converter and self-correcting method thereof |
| CN107896111A (en) * | 2017-10-16 | 2018-04-10 | 西安电子科技大学 | Flow-line modulus converter analog front circuit |
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