CN111416784A - Digital signal modulation system and method - Google Patents
Digital signal modulation system and method Download PDFInfo
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- CN111416784A CN111416784A CN202010311742.1A CN202010311742A CN111416784A CN 111416784 A CN111416784 A CN 111416784A CN 202010311742 A CN202010311742 A CN 202010311742A CN 111416784 A CN111416784 A CN 111416784A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims abstract description 22
- 238000005859 coupling reaction Methods 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 230000005684 electric field Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/12—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/16—Frequency regulation arrangements
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The invention relates to the technical field of isolation amplifiers, in particular to a digital signal modulation system and a digital signal modulation method, which can effectively solve the problem of interference of signals with transmission and comprises a sending end module and a receiving end module, and is characterized in that a magnetic coupling circuit is arranged between the sending end module and the receiving end module and comprises a coil and a magnetic sensor, the sending end module comprises a preamplifier/filter circuit, a binary modulation switch, a Delta-Sigma band-pass modulator and a current source switch group which are sequentially connected, the receiving end module comprises a binary demodulation switch, and the binary demodulation switch is connected with a low-pass filter or a digital signal processing unit; meanwhile, the invention provides a corresponding method.
Description
Technical Field
The invention relates to the technical field of isolation amplifiers, in particular to a digital signal modulation system and a digital signal modulation method.
Background
In the field of chip applications, it often occurs that the chip is required to perform analog signal transmission between two voltage domains, which must be performed in different power supply systems, and is therefore called an isolation amplifier; if the analog signal needs to be transmitted and analog-digital converted, the analog signal is used as an isolated analog-digital converter.
As shown in fig. 1, a transmission path different from a normal coupling method is adopted between a transmitting end 101 and a receiving end 102 of a conventional isolation amplifier, and the transmission path is usually performed by an optical coupling 103, an electric field coupling 104, a magnetic coupling 105, and the like. Wherein, the optical coupling needs special semiconductor process and packaging, the cost is higher and the integration level is not high; the electric field coupling method is limited by the problem that the chip area is large, low-frequency signals cannot be conducted, but high-frequency signals are easily interfered.
The magnetic coupling has the advantages of high integration level, low chip cost and the like because the technology of integrating the magnetic sensor (such as a Hall device, a magnetoresistive device and the like) on the chip is mature and the area of the magnetic sensor is small. A conventional magnetic coupling circuit is shown in fig. 2 (the right half is a schematic diagram, and the left half is a top view of the chip), and includes a coil for generating a magnetic field and a magnetic sensor for sensing the magnetic field. Since the frequency range of magnetic field induction by conventional magnetic sensors (e.g., hall devices, magneto-resistive devices, etc.) covers from dc to high frequencies (tens of khz to several mhz), magnetic sensors are susceptible to interference from external magnetic fields in this frequency range. Meanwhile, the magnetic sensor itself also exists such as: large direct current zero drift (Hall device), large self thermal noise (magnetoresistive device) and the like. If direct coupling of analog signals is used, it is easy to cause interference of the signals to be transmitted.
Disclosure of Invention
In order to solve the problem that the signal to be transmitted is easily interfered when the existing magnetic coupling isolation amplifier is directly coupled by using an analog signal, the invention provides a digital signal modulation system which can effectively solve the problem of interference of a signal with transmission and simultaneously provides a corresponding method.
The technical scheme is as follows: a digital signal modulation system comprises a sending end module and a receiving end module, and is characterized in that a magnetic coupling circuit is arranged between the sending end module and the receiving end module, the magnetic coupling circuit comprises a coil and a magnetic sensor, the sending end module comprises a preamplifier/filter circuit, a binary modulation switch, a Delta-Sigma band-pass modulator and a current source switch group which are sequentially connected, the receiving end module comprises a binary demodulation switch, and the binary demodulation switch is connected with a low-pass filter or a digital signal processing unit.
A digital signal modulation method is characterized in that an analog signal to be transmitted is modulated by a binary modulation switch after passing through a preamplifier/filter circuit, the modulation signal is further modulated by a Delta-Sigma band-pass modulator, the central frequency of a passband of the Delta-Sigma band-pass modulator is consistent with the modulation frequency of binary modulation, a further modulated signal converts a voltage signal into a signal in a current form through a current source switch group, the current signal is sent to a receiving end module through a magnetic coupling circuit, the binary demodulation switch demodulates the signal, the demodulated signal is filtered by a low-pass filter to remove high-frequency noise, reduces low-frequency signals to be transmitted and outputs the signals to chip pins or is digitally filtered by a digital signal processing unit, and the digital waveform of an analog signal to be transmitted is directly output to complete analog-digital conversion.
After the invention is adopted, the sending end module and the receiving end module which are redesigned apply a digital modulation mode, thereby furthest inhibiting the influence of direct current null shift and thermal noise in magnetic coupling and the influence of noise and null shift on a chip such as a preamplifier/filter circuit, and finally obtaining the required signal.
Drawings
FIG. 1 is a schematic diagram of a prior art isolation amplifier;
FIG. 2 is a schematic diagram of a magnetic coupling circuit;
FIG. 3 is a schematic diagram of the system of the present invention;
fig. 4 is a schematic structural diagram of the hall device.
Detailed Description
Referring to fig. 3, a digital signal modulation system includes a transmitting end module and a receiving end module, a magnetic coupling circuit is arranged between the transmitting end module and the receiving end module, the magnetic coupling circuit includes a coil 305 and a magnetic sensor 306, the transmitting end module includes a preamplifier/filter circuit 301, a binary modulation switch 302, a Delta-Sigma band-pass modulator 303, and a current source switch group 304, which are connected in sequence, the receiving end module includes a second-level demodulation switch 307, and the second-level demodulation switch 307 is connected to a low-pass filter 308 or a digital signal processing unit 309.
A digital signal modulation method, after passing through a preamplifier/filter circuit 301, an analog signal 300 to be transmitted is subjected to binary modulation by a simple binary modulation switch 302, and a modulation signal is further modulated by a Delta-Sigma band-pass modulator 303, wherein the passband center frequency of the Delta-Sigma band-pass modulator 303 is consistent with the modulation frequency of the binary modulation; the signal passes through a current source switch block 304, and the voltage signal is converted into a signal in a current form; when the current flows through the coil 305 with a specific shape, specifically, the shapes of the coils corresponding to the hall device shown in fig. 4 are respectively square, hexagonal and octagonal, a corresponding magnetic field signal is formed; the modules complete the conversion from the signals to be transmitted to the magnetic field signals; the frequency domain characteristics of the magnetic field signal are shown at 310, the frequency to be transmitted is at the mid-frequency position, and the low and high frequencies are unwanted noise (shaded in 310).
In the receiving end, the signal output by the magnetic sensor 306 is demodulated by a simple binary demodulation switch 307, the frequency spectrum of which is shown as 311, it can be seen that the signal to be transmitted has been demodulated from the intermediate frequency part to the low frequency part, and the noise (shaded part) is concentrated in the intermediate frequency and high frequency parts; the signal passes through a low-pass filter 308 to filter out unnecessary medium-high frequency noise (a shaded part surrounded by a dotted line), and finally, a low-frequency signal 310 to be transmitted is restored and output to a chip pin; or in the isolated analog-to-digital converter, the digital signal processing unit 309 directly performs digital filtering on the digital signal output by the binary demodulation switch 307, and directly outputs the digital waveform 320 of the analog signal 300 to be transmitted, thereby completing analog-to-digital conversion.
Fig. 2 is a schematic diagram of a magnetic coupling device, in which 201 is a coil and 202 is a magnetic sensor.
The modulation method of the invention adopts a digital modulation mode, thereby furthest inhibiting the influence of direct current zero drift and thermal noise in magnetic coupling and other circuits on a chip, such as: the effects of noise and null drift in the preamplifier/filter circuit 301. The functional components are simple, such as the binary modulation switch 302 and the binary demodulation switch 307, and a path of clock coupling transmission, namely 312 in the figure, is added.
Claims (2)
1. A digital signal modulation system comprises a sending end module and a receiving end module, and is characterized in that a magnetic coupling circuit is arranged between the sending end module and the receiving end module, the magnetic coupling circuit comprises a coil and a magnetic sensor, the sending end module comprises a preamplifier/filter circuit, a binary modulation switch, a Delta-Sigma band-pass modulator and a current source switch group which are sequentially connected, the receiving end module comprises a binary demodulation switch, and the binary demodulation switch is connected with a low-pass filter or a digital signal processing unit.
2. A digital signal modulation method is characterized in that an analog signal to be transmitted is modulated by a binary modulation switch after passing through a preamplifier/filter circuit, the modulation signal is further modulated by a Delta-Sigma band-pass modulator, the central frequency of a passband of the Delta-Sigma band-pass modulator is consistent with the modulation frequency of binary modulation, a further modulated signal converts a voltage signal into a signal in a current form through a current source switch group, the current signal is sent to a receiving end module through a magnetic coupling circuit, the binary demodulation switch demodulates the signal, the demodulated signal is filtered by a low-pass filter to remove high-frequency noise, reduces low-frequency signals to be transmitted and outputs the signals to chip pins or is digitally filtered by a digital signal processing unit, and the digital waveform of an analog signal to be transmitted is directly output to complete analog-digital conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311742.1A CN111416784A (en) | 2020-04-20 | 2020-04-20 | Digital signal modulation system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010311742.1A CN111416784A (en) | 2020-04-20 | 2020-04-20 | Digital signal modulation system and method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH034646A (en) * | 1989-05-31 | 1991-01-10 | Icom Inc | Digital modulator |
| DE102014105013A1 (en) * | 2013-04-08 | 2014-10-09 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Transmit and receive digital and analog signals across an isolator |
| CN205861875U (en) * | 2016-08-10 | 2017-01-04 | 哈尔滨理工大学 | Multiple-passage large power xenon flash lamp discharge monitoring device |
| CN206402227U (en) * | 2017-01-09 | 2017-08-11 | 上海胤祺集成电路有限公司 | Signal transmission device |
| CN109995392A (en) * | 2017-12-28 | 2019-07-09 | 上海胤祺集成电路有限公司 | Magnetic coupling communication transceiver, magnetic coupling communication master chip and magnetic coupling communication system |
| CN212183545U (en) * | 2020-04-20 | 2020-12-18 | 无锡思泰迪半导体有限公司 | Digital signal modulation system |
-
2020
- 2020-04-20 CN CN202010311742.1A patent/CN111416784A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH034646A (en) * | 1989-05-31 | 1991-01-10 | Icom Inc | Digital modulator |
| DE102014105013A1 (en) * | 2013-04-08 | 2014-10-09 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Transmit and receive digital and analog signals across an isolator |
| CN205861875U (en) * | 2016-08-10 | 2017-01-04 | 哈尔滨理工大学 | Multiple-passage large power xenon flash lamp discharge monitoring device |
| CN206402227U (en) * | 2017-01-09 | 2017-08-11 | 上海胤祺集成电路有限公司 | Signal transmission device |
| CN109995392A (en) * | 2017-12-28 | 2019-07-09 | 上海胤祺集成电路有限公司 | Magnetic coupling communication transceiver, magnetic coupling communication master chip and magnetic coupling communication system |
| CN212183545U (en) * | 2020-04-20 | 2020-12-18 | 无锡思泰迪半导体有限公司 | Digital signal modulation system |
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Effective date of registration: 20221214 Address after: No. 295, Building 17, No. 2723, Fuchunwan Avenue, Chunjiang Street, Fuyang District, Hangzhou, Zhejiang, 310000 Applicant after: Hangzhou Sitai Microelectronics Co.,Ltd. Address before: 214028 No.16 Changjiang Road, Xinwu District, Wuxi City, Jiangsu Province Applicant before: STEADICHIPS Inc. |