Isolated ADC apparatus

Abstract

Disclosed in the present invention is an isolated ADC apparatus, comprising a primary side control circuit, a secondary side control circuit and a millimeter wave transmission circuit which are integrated on the same chip. The primary side control circuit is connected to the secondary side control circuit by means of the millimeter wave transmission circuit, and the millimeter wave transmission circuit comprises a first millimeter wave transmission module and a second millimeter wave transmission module. The secondary side control circuit comprises an ADC module, an output end of the ADC module, the first millimeter wave transmission module and a data output interface of the primary side control circuit being successively connected. By means of the first millimeter wave transmission module, the secondary side control circuit transmits a signal generated by the ADC module to the primary side control circuit; by means of the second millimeter wave transmission module, the primary side control circuit transmits a clock signal to the ADC module of the secondary side control circuit. The present invention achieves the single-chip isolated ADC integrating power supply isolation, signal isolation and clock isolation, thus improving the sampling rate and the dynamic properties of the isolated ADC.

Description

An isolated ADC device Technical Field

[0001] The present invention relates to the technical field of integrated circuit design, and in particular to an isolated ADC device. Background Art

[0002] An isolated ADC (Analog-to-Digital Converter) is an analog-to-digital converter (ADC) with electrical isolation. It adds electrical isolation technology to the ADC to electrically isolate the input signal from the conversion circuit. Generally speaking, traditional ADCs directly connect the analog input signal to the conversion circuit, while isolated ADCs use isolation devices (such as optocouplers, magnetic couplers, or transformers) to isolate the electrical connection between the input signal and the conversion circuit.

[0003] This isolated design provides several advantages:

[0004] (1) Electrical isolation: An isolated ADC implements electrical isolation between the input signal and the conversion circuit to prevent interference caused by different potential differences and electrical noise. This helps improve the stability, anti-interference ability, and safety of the system.

[0005] (2) Isolation: Isolated ADCs allow signal transmission between systems with different ground potentials or ground loops. This facilitates data transmission between measurement and control systems that need to span different locations.

[0006] (3) Safety protection: Since the input signal is isolated, the isolated ADC can provide higher safety protection and prevent high voltage or high current from being directly transmitted to the back-end electronic system.

[0007] (4) Application in complex environments: Isolated ADCs can be used for signal acquisition and control in complex industrial environments to prevent external interference from affecting system operation.

[0008] However, existing isolated ADCs typically use capacitive or magnetic coupling to achieve signal isolation. Due to technical limitations, it is difficult to achieve breakthroughs in signal transmission rate, transmission delay, and signal jitter. As a result, the sampling rate of isolated ADCs is limited to around 20MHz, which has become a technical bottleneck for achieving signal isolation in high-speed, high-precision ADCs.

[0009] Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide an isolated ADC device to improve the sampling rate and dynamic performance of the isolated ADC.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is: an isolated ADC device, including a primary-side control circuit and a secondary-side control circuit, and also including a millimeter-wave transmission circuit; the primary-side control circuit, the secondary-side control circuit and the millimeter-wave transmission circuit are integrated on the same chip; the primary-side control circuit is connected to the secondary-side control circuit through the millimeter-wave transmission circuit; the primary-side control circuit is also connected to the processor through a data transmission interface; the millimeter-wave transmission circuit includes a first millimeter-wave transmission module and a second millimeter-wave transmission module; the secondary-side control circuit includes an ADC module; the output end of the ADC module, the first millimeter-wave transmission module and the data output interface of the primary-side control circuit are connected in sequence; the secondary-side control circuit transmits the signal generated by the ADC module to the primary-side control circuit through the first millimeter-wave transmission module; the primary-side control circuit transmits the clock signal to the ADC module of the secondary-side control circuit through the second millimeter-wave transmission module.

[0012] Among them, the second millimeter wave transmission module includes: a second millimeter wave transmitting circuit, a second millimeter wave transmitting antenna, a second millimeter wave receiving circuit and a second millimeter wave receiving antenna; the input end of the second millimeter wave transmitting circuit is used to receive a clock signal, and its output end is connected to the second millimeter wave transmitting antenna; the output end of the second millimeter wave receiving circuit is connected to the input end of the ADC module, and its input end is connected to the second millimeter wave receiving antenna.

[0013] The first millimeter wave transmission module includes: a first millimeter wave transmitting circuit, a first millimeter wave transmitting antenna, a first millimeter wave receiving circuit and a first millimeter wave receiving antenna.

[0014] In which, the primary side control circuit also includes a digital signal processing module; the output end of the first millimeter wave receiving circuit is connected to the input end of the digital signal processing module, and its input end is connected to the first millimeter wave receiving antenna; the output end of the digital signal processing module is connected to the processor through the data output interface; the input end of the first millimeter wave transmitting circuit is connected to the output end of the ADC module, and its output end is connected to the first millimeter wave transmitting antenna.

[0015] In which, the primary side control circuit includes a data decoding module; the secondary side control circuit also includes a data encoding module; the input end of the data decoding module is connected to the output end of the first millimeter wave receiving circuit, and its output end is connected to the processor through the data output interface; the input end of the data encoding module is connected to the output end of the ADC module, and its output end is connected to the input end of the first millimeter wave transmitting circuit; the input end of the first millimeter wave transmitting circuit is connected to the output end of the ADC module, and its output end is connected to the first millimeter wave transmitting antenna.

[0016] Among them, the interface protocols and data output interfaces corresponding to the encoding module and decoding module are consistent.

[0017] Wherein, the millimeter wave transmission circuit is a millimeter wave transmission chip.

[0018] The beneficial effects of the present invention are as follows: the primary-side control circuit and the secondary-side control circuit are integrated on the same chip, and a processor is provided on the single chip, so that the processor controls the primary-side control circuit; at the same time, communication between the primary-side control circuit and the secondary-side control circuit is provided via a millimeter-wave transmission circuit, and the isolation of the millimeter-wave transmission circuit ensures the safety distance requirement between the primary-side control circuit and the secondary-side control circuit; further, ADC isolation is achieved based on millimeter-wave communication technology, and a single-chip isolated ADC integrating power isolation, signal isolation and clock isolation is realized, breaking the limitations of signal transmission rate and signal jitter, thereby achieving a breakthrough in the sampling rate and dynamic performance of the isolated ADC. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic diagram of the circuit structure of an isolated ADC device according to an embodiment of the present invention;

[0020] FIG2 is a schematic diagram of the circuit structure of an isolated ADC device according to another embodiment of the present invention;

[0021] FIG3 is a schematic structural diagram of a first circuit of a millimeter wave transmission module in an isolated ADC device according to an embodiment of the present invention;

[0022] FIG4 is a schematic structural diagram of a second circuit of a millimeter transmission module in an isolated ADC device according to an embodiment of the present invention.

[0023] Description of the accompanying drawings: Isolated ADC device 10 Primary side control circuit 20, 20' Data decoding module 21' Secondary side control circuit 30, 30' ADC module 31 Data encoding module 32' Millimeter wave transmission circuit 40 First millimeter wave transmission module 41 First millimeter wave transmitting circuit 411 First millimeter wave transmitting antenna 412 First millimeter wave receiving circuit 413 First millimeter wave receiving antenna 414 Second millimeter wave transmission module 42 Second millimeter wave transmitting circuit 421 Second millimeter wave transmitting antenna 422 Second millimeter wave receiving circuit 423 Second millimeter wave receiving antenna 424 Processor 50 DETAILED DESCRIPTION

[0024] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0025] The above-mentioned isolated ADC device of the present application can be applied to various isolated application fields requiring ADC type products, such as automation control, scientific research equipment, LED lighting, industrial control equipment, communication equipment, etc., which are explained below through specific implementation methods.

[0026] Please refer to FIG. 1 , which shows an isolated ADC device 10 , including a primary-side control circuit 20 , a secondary-side control circuit 30 , and a millimeter-wave transmission circuit 40 .

[0027] The primary-side control circuit 20 , the secondary-side control circuit 30 and the millimeter-wave transmission circuit 40 are integrated on the same chip.

[0028] The primary-side control circuit 20 is connected to the secondary-side control circuit 30 through the millimeter-wave transmission circuit 40 .

[0029] The primary-side control circuit 20 is also connected to the processor 50 via a data transmission interface (ie, Data Output Interface).

[0030] In order to achieve millimeter wave transmission, in an optional implementation, the millimeter wave transmission circuit 40 includes a first millimeter wave transmission module 41 and a second millimeter wave transmission module 42 .

[0031] The secondary-side control circuit 30 further includes an ADC module 31 ; an output end of the ADC module 31 , the first millimeter-wave transmission module 41 , and a data output interface of the primary-side control circuit 20 are connected in sequence.

[0032] The secondary-side control circuit 30 transmits the signal generated by the ADC module 31 to the primary-side control circuit 20 through the first millimeter-wave transmission module 41 ; the primary-side control circuit 20 transmits the clock signal to the ADC module 31 of the secondary-side control circuit 30 through the second millimeter-wave transmission module 42 .

[0033] Specifically, the first millimeter wave transmission module 41 includes a first millimeter wave transmitting circuit 411, a first millimeter wave transmitting antenna 412, a first millimeter wave receiving circuit 413, and a first millimeter wave receiving antenna 414. The second millimeter wave transmission module 42 includes a second millimeter wave transmitting circuit 421, a second millimeter wave transmitting antenna 422, a second millimeter wave receiving circuit 423, and a second millimeter wave receiving antenna 424.

[0034] The primary-side control circuit 20 further includes a digital signal processing module 21 .

[0035] The output end of the first millimeter wave receiving circuit 413 is connected to the input end of the digital signal processing module 21, and its input end is connected to the first millimeter wave receiving antenna 414; the output end of the digital signal processing module 21 is connected to the processor 50 through the data output interface.

[0036] The input end of the first millimeter wave transmitting circuit 411 is connected to the output end of the ADC module 31 , and its output end is connected to the first millimeter wave transmitting antenna 412 ; the input end of the ADC module 31 is connected to the peripheral circuit through an analog signal input interface.

[0037] An input end of the second millimeter wave transmitting circuit 421 is used to receive a clock signal (ie, a CLK signal) input from a peripheral circuit, and an output end thereof is connected to the second millimeter wave transmitting antenna 422 .

[0038] An output end of the second millimeter wave receiving circuit 423 is connected to an input end of the ADC module 31 , and an input end thereof is connected to the second millimeter wave receiving antenna 424 .

[0039] As described above, corresponding isolation zones are set between the first millimeter wave transmitting antenna 412 and the first millimeter wave receiving antenna 414 , and between the second millimeter wave receiving antenna 422 and the second millimeter wave transmitting antenna 424 .

[0040] Based on the isolated ADC device described above, the primary-side control circuit 20 and the secondary-side control circuit 30 are completely isolated by the provided isolation zone. The second millimeter-wave transmitting circuit 421 of the primary-side control circuit 20 is used to input a clock signal and transmit the clock signal to the second millimeter-wave receiving antenna 421 of the secondary-side control circuit 30 based on the millimeter-wave signal through the second millimeter-wave transmitting antenna 424. The second millimeter-wave receiving antenna 423 transmits the clock signal to the ADC module 31 as the sampling clock of the ADC module 31.

[0041] The ADC module 31 samples the original data in response to the sampling clock, and generates a corresponding digital signal through analog-to-digital conversion; the first millimeter wave transmitting circuit 411 receives the digital signal output by the ADC module 31, and transmits the digital signal to the first millimeter wave receiving antenna 414 of the primary side control circuit 30 based on the millimeter wave signal through the first millimeter wave transmitting antenna 412, and the first millimeter wave receiving circuit 413 transmits the digital signal to the digital signal processing module 21.

[0042] The digital signal processing module 21 processes the received digital signal and transmits it to the processor 50 through the data output interface for further processing. Specifically, the digital signal processing module 21 mainly performs extraction and filtering operations on the code stream data and transmits the processed sampling results to the processor 50 through the data output interface.

[0043] Furthermore, in order to achieve data synchronization, the clock signal is also transmitted to the digital signal processing module 21 at the same time as a reference clock.

[0044] In this embodiment, the data output interface can be an SPI, I2C, LVDS, Parallel or other interface, which is selected according to the needs of the processor.

[0045] Millimeter-wave communication can achieve a maximum communication rate of 10Gbps, with signal latency within 3nS and signal jitter controllable to the picosecond level. Furthermore, by controlling power, millimeter-wave communication can easily achieve centimeter-level communication distances, significantly increasing its isolation and voltage resistance. Based on these characteristics, millimeter-wave isolation, while providing enhanced isolation, can fully meet the signal requirements of high-speed, high-precision ADCs. Furthermore, the speed advantage of millimeter-wave isolation can significantly reduce the size of the transformer required for DC-DC modules, allowing the use of on-chip transformers to meet these requirements. This enables a single-chip isolated ADC solution that includes power, data, and clock isolation.

[0046] In this embodiment, the signal transmission between the primary side control circuit 20 and the secondary side control circuit 30 is realized with the help of the millimeter wave transmission circuit. Since the millimeter wave transmission circuit 40 realizes signal transmission with the help of millimeter waves, it spatially isolates the primary side control circuit 20 and the secondary side control circuit 30, greatly improving the signal transmission speed.

[0047] In another optional embodiment, the millimeter wave transmission circuit 40 is a millimeter wave transmission chip. The chip design can further reduce the size of the switching power supply and achieve a lightweight design of the device.

[0048] Please refer to FIG. 2 . In an optional embodiment, the primary-side control circuit 20 ′ includes a data decoding module 21 ′; and the secondary-side control circuit 30 ′ further includes a data encoding module 32 ′.

[0049] The input end of the data decoding module 21 ′ is connected to the output end of the first millimeter wave receiving circuit 413 , and the output end thereof is connected to the processor 50 via the data output interface.

[0050] The input end of the data encoding module 32 ′ is connected to the output end of the ADC module 31 ′, and the output end thereof is connected to the input end of the first millimeter wave transmitting circuit 411 .

[0051] Based on the isolated ADC device described above, the primary-side control circuit 20' and the secondary-side control circuit 30' are completely isolated by the provided isolation zone. The first millimeter-wave transmitting circuit 411 of the primary-side control circuit 20' is used to input a clock signal and transmit the clock signal to the first millimeter-wave receiving antenna 414 of the secondary-side control circuit 30' based on the millimeter-wave signal through the first millimeter-wave transmitting antenna 412. The second millimeter-wave receiving circuit 413 transmits the clock signal to the ADC module 31' as the sampling clock of the ADC module 31'.

[0052] The ADC module 31' samples raw data in response to the sampling clock and generates a corresponding digital signal through analog-to-digital conversion. The data encoding module 32' is used to receive the digital signal generated by the ADC module 31' and perform encoding processing to convert data from different protocol interfaces into serial data. The first millimeter-wave transmitting circuit 411 receives the encoded signal output by the encoding module 32' and transmits the encoded signal to the first millimeter-wave receiving antenna 414 of the primary-side control circuit 20' based on the millimeter-wave signal via the first millimeter-wave transmitting antenna 412. The first millimeter-wave receiving circuit 413 transmits the encoded signal to the decoding module 21'.

[0053] The decoding module 21 ′ processes the received coded signal, decodes the serial data into data corresponding to the communication protocol, and transmits the data to the processor 50 for processing through the data output interface.

[0054] In this embodiment, the interface protocols and data output interfaces corresponding to the encoding module 32 ′ and the decoding module 21 ′ are consistent.

[0055] Please refer to FIG4 , the millimeter wave transmitting circuit includes a digital-to-analog converter, a first baseband amplifier, a first mixer, a first phase-locked loop, a first radio frequency amplifier, and a first filter;

[0056] The first millimeter wave receiving circuit includes a second filter, a second radio frequency amplifier, a second mixer, a second phase-locked loop, a second baseband amplifier and an analog-to-digital converter;

[0057] The second input terminal of the first mixer is connected to the output terminal of the phase-locked loop, and the output terminal of the first mixer is connected to the input terminal of the second radio frequency amplifier;

[0058] The output end of the first radio frequency amplifier is connected to the input end of the first filter;

[0059] The output end of the first filter is connected to the transmitting antenna;

[0060] The input end of the second filter is connected to the receiving antenna, and the output end is connected to the first input end of the second mixer;

[0061] The second input end of the second mixer is connected to the output end of the second phase-locked loop, and the output end of the second mixer is connected to the input end of the second baseband filter.

[0062] As described above, the first millimeter wave transmitting circuit 411, the first millimeter wave receiving circuit 413, the second millimeter wave transmitting circuit 421 and the second millimeter wave receiving circuit 423 in the embodiment of the present invention all have the circuit structure described above, and are not described in detail here.

[0063] The output end of the second baseband filter is used to connect to the input end of the ADC module, and the output end of the ADC module is connected to the first input end of the first mixer.

[0064] Please refer to FIG4 , the millimeter wave transmitting circuit includes an oscillator, a modulator, and a third radio frequency amplifier;

[0065] The millimeter wave receiving circuit includes a fourth radio frequency amplifier and an envelope detector;

[0066] The output terminal of the oscillator is connected to the first input terminal of the modulator;

[0067] The second input end of the modulator is connected to the digital signal output interface, and the output end is connected to the input end of the third radio frequency amplifier;

[0068] The output end of the third radio frequency amplifier is connected to the transmitting antenna;

[0069] The input end of the fourth radio frequency amplifier is connected to the receiving antenna, and the output end is connected to the input end of the envelope detector;

[0070] The output end of the envelope detector is connected to the input end of the ADC module.

[0071] As described above, the first millimeter wave transmitting circuit 411, the first millimeter wave receiving circuit 413, the second millimeter wave transmitting circuit 421 and the second millimeter wave receiving circuit 423 in the embodiment of the present invention all have the circuit structure described above, and are not described in detail here.

[0072] In summary, the present invention provides an isolated ADC device that integrates a primary-side control circuit and a secondary-side control circuit on the same chip, and provides a processor on the single chip to control the primary-side control circuit. Furthermore, communication between the primary-side control circuit and the secondary-side control circuit is provided via a millimeter-wave transmission circuit. The isolation of the millimeter-wave transmission circuit ensures the safety distance requirement between the primary-side control circuit and the secondary-side control circuit. Furthermore, ADC isolation is achieved based on millimeter-wave communication technology, realizing a single-chip isolated ADC that integrates power isolation, signal isolation, and clock isolation. This breaks the limitations of signal transmission rate and signal jitter, thereby achieving breakthroughs in the sampling rate and dynamic performance of the isolated ADC.

[0073] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An isolated ADC device, comprising a primary side control circuit and a secondary side control circuit, characterized in that: Also included is a millimeter wave transmission circuit; The primary side control circuit, the secondary side control circuit and the millimeter wave transmission circuit are integrated on the same chip; The primary side control circuit is connected to the secondary side control circuit via the millimeter wave transmission circuit; The primary side control circuit is also connected to the processor via a data transmission interface; The millimeter wave transmission circuit includes a first millimeter wave transmission module and a second millimeter wave transmission module; The secondary side control circuit comprises an ADC module; the output end of the ADC module, the first millimeter wave transmission module and the data output interface of the primary side control circuit are connected in sequence; The secondary-side control circuit transmits the signal generated by the ADC module to the primary-side control circuit through the first millimeter-wave transmission module; the primary-side control circuit transmits the clock signal to the ADC module of the secondary-side control circuit through the second millimeter-wave transmission module.

2. The isolated ADC device according to claim 1, characterized in that: The second millimeter wave transmission module includes: a second millimeter wave transmitting circuit, a second millimeter wave transmitting antenna, a second millimeter wave receiving circuit and a second millimeter wave receiving antenna; The input end of the second millimeter wave transmitting circuit is used to receive a clock signal, and its output end is connected to the second millimeter wave transmitting antenna; the output end of the second millimeter wave receiving circuit is connected to the input end of the ADC module, and its input end is connected to the second millimeter wave receiving antenna.

3. The isolated ADC device according to claim 2, characterized in that: The first millimeter wave transmission module includes: a first millimeter wave transmitting circuit, a first millimeter wave transmitting antenna, a first millimeter wave receiving circuit and a first millimeter wave receiving antenna.

4. The isolated ADC device according to claim 3, characterized in that: The primary side control circuit also includes a digital signal processing module; The output end of the first millimeter wave receiving circuit is connected to the input end of the digital signal processing module, and its input end is connected to the first millimeter wave receiving antenna; the output end of the digital signal processing module is connected to the processor through the data output interface; The input end of the first millimeter wave transmitting circuit is connected to the output end of the ADC module, and the output end of the first millimeter wave transmitting antenna is connected to the first millimeter wave transmitting antenna.

5. The isolated ADC device according to claim 3, characterized in that: The primary side control circuit includes a data decoding module; The secondary side control circuit also includes a data encoding module; The input end of the data decoding module is connected to the output end of the first millimeter wave receiving circuit, and the output end thereof is connected to the processor through the data output interface; The input end of the data encoding module is connected to the output end of the ADC module, and the output end thereof is connected to the input end of the first millimeter wave transmitting circuit; The input end of the first millimeter wave transmitting circuit is connected to the output end of the ADC module, and the output end of the first millimeter wave transmitting antenna is connected to the first millimeter wave transmitting antenna.

6. The isolated ADC device according to claim 5, characterized in that: The interface protocols and data output interfaces corresponding to the encoding module and the decoding module are consistent.

7. The isolated ADC device according to any one of claims 1 to 6, characterized in that: The millimeter wave transmission circuit is a millimeter wave transmission chip.

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