High-frequency millimeter wave digital isolator

Abstract

The present invention provides a high-frequency millimeter wave digital isolator, comprising a transmitter and a receiver, and further comprising an integrated isolation device. The integrated isolation device comprises a first millimeter wave antenna and a second millimeter wave antenna; the first millimeter wave antenna and the second millimeter wave antenna are arranged on a same horizontal plane, and an isolation zone is provided between the first millimeter wave antenna and the second millimeter wave antenna; the first millimeter wave antenna is connected to the transmitter, and the second millimeter wave antenna is connected to the receiver; and a signal is transmitted between the transmitter and the receiver by means of the integrated isolation device. Signal transmission between the transmitter and the receiver is performed by providing the integrated isolation device, and the integrated isolation device comprises the first millimeter wave antenna and the second millimeter wave antenna which are arranged on the same horizontal plane with the isolation zone therebetween, so that the isolation efficiency and the transmission efficiency can be ensured at the same time under the high-frequency condition. The risk of open circuit caused by collapse is avoided.

Description

A high-frequency millimeter-wave digital isolator Technical Field

[0001] The present invention relates to the technical field of digital isolation, and in particular to a high-frequency millimeter-wave digital isolator. Background Art

[0002] Traditional digital isolators are typically designed with closely arranged and magnetically coupled inductors (such as planar spiral inductors). As the frequency of the signal transmitted between two circuits in different voltage domains increases, either the distance between the inductors must be kept small to maintain transmission efficiency but sacrifice isolation, or the distance must be increased to maintain isolation but sacrifice transmission efficiency.

[0003] In addition, the existing magnetic couple has an up-and-down transmission structure. Under high pressure, the upper part may collapse and hit the lower part, causing a short circuit. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a high-frequency millimeter-wave digital isolator that can maintain both isolation efficiency and transmission efficiency without causing circuit breakage due to collapse.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A high-frequency millimeter-wave digital isolator includes a transmitter, a receiver, and an integrated isolation device. The integrated isolation device includes a first millimeter-wave antenna and a second millimeter-wave antenna. The first millimeter-wave antenna and the second millimeter-wave antenna are arranged on the same horizontal plane, and an isolation strip is provided between the first millimeter-wave antenna and the second millimeter-wave antenna. The first millimeter-wave antenna is connected to the transmitter, and the second millimeter-wave antenna is connected to the receiver. Signals are transmitted between the transmitter and the receiver through the integrated isolation device.

[0007] The present invention provides a beneficial effect: by providing an integrated isolation device for signal transmission between a transmitter and a receiver, the device comprises a first millimeter-wave antenna and a second millimeter-wave antenna arranged on the same horizontal plane with an isolation zone between them. This device can simultaneously maintain isolation and transmission efficiency at high frequencies. Furthermore, because the first and second millimeter-wave antennas are arranged on the same horizontal plane, there is no risk of collapse and circuit breakage, as compared to conventional upper and lower magnetic dipole structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG1 is a system diagram of a high-frequency millimeter-wave digital isolator according to a first embodiment of the present invention;

[0009] FIG2 is a system diagram of a first matching network according to a first embodiment of the present invention;

[0010] FIG3 is a schematic diagram showing an equivalent circuit of a first matching network according to a first embodiment of the present invention;

[0011] FIG4 is a schematic diagram showing an equivalent circuit of the first matching network as viewed from the primary side according to the first embodiment of the present invention;

[0012] FIG5 is a system diagram of a second matching network according to the first embodiment of the present invention;

[0013] FIG6 is a system diagram of a high-frequency millimeter-wave digital isolator according to a second embodiment of the present invention;

[0014] FIG7 is a system diagram of a high-frequency millimeter-wave digital isolator according to a third embodiment of the present invention;

[0015] FIG8 is a first structural diagram of a millimeter wave antenna of a high-frequency millimeter wave digital isolator according to a fourth embodiment of the present invention;

[0016] FIG9 shows a second structural diagram of the millimeter wave antenna of the high-frequency millimeter wave digital isolator according to the fourth embodiment of the present invention;

[0017] FIG10 is a schematic diagram showing the structure of a millimeter wave antenna connected to a transmitter and a receiver of a high-frequency millimeter wave digital isolator according to a fourth embodiment of the present invention;

[0018] FIG11 is a schematic diagram showing the structure of a millimeter wave antenna of a high-frequency millimeter wave digital isolator according to a fifth embodiment of the present invention;

[0019] FIG12 is a schematic structural diagram showing a millimeter wave antenna connected to a transmitter and a receiver of a high-frequency millimeter wave digital isolator according to a fifth embodiment of the present invention;

[0020] FIG13 is a schematic diagram showing the structure of a millimeter wave antenna of a high-frequency millimeter wave digital isolator according to a sixth embodiment of the present invention;

[0021] FIG14 is a schematic structural diagram showing a millimeter wave antenna connected to a transmitter and a receiver of a high-frequency millimeter wave digital isolator according to a sixth embodiment of the present invention.

[0022] Explanation of reference numerals: 1. Transmitter; 11. Voltage-controlled oscillator; 12. Input buffer; 13. Mixer; 14. First matching network; 2. Receiver; 21. Second matching network; 22. Amplifier; 23. Demodulator; 24. Output buffer; 25. Envelope detector; 25', Demodulator; 3. Integrated isolation device; 31. First millimeter-wave antenna; 32. Second millimeter-wave antenna; 33. Isolation band. DETAILED DESCRIPTION

[0023] In order to more clearly understand the technical content, achieved purposes and effects of the present invention, the present invention is described in detail below in conjunction with specific embodiments and in conjunction with the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] As shown in Figures 1 to 14, the present invention provides the following technical solutions:

[0025] A high-frequency millimeter-wave digital isolator includes a transmitter and a receiver, and also includes an integrated isolation device. The integrated isolation device includes a first millimeter-wave antenna and a second millimeter-wave antenna. The first millimeter-wave antenna and the second millimeter-wave antenna are arranged on the same horizontal plane, and an isolation band is provided between the first millimeter-wave antenna and the second millimeter-wave antenna. The first millimeter-wave antenna is connected to the transmitter, and the second millimeter-wave antenna is connected to the receiver. Signals are transmitted between the transmitter and the receiver through the integrated isolation device.

[0026] In an optional embodiment, the transmitter includes a first matching network, and the first millimeter-wave antenna is connected to the first matching network. The first matching network can be configured to match the output impedance of the transmitter with the input impedance of the integrated isolation device. The first matching network can also be configured to eliminate parasitic effects between the input pad, the transmitter, the integrated isolation device, etc., and by setting a reasonable quality factor of the first matching network, a flat bandpass is formed between the transmitter and the first millimeter-wave antenna to reduce jitter.

[0027] In an optional embodiment, the transmitter also includes a voltage-controlled oscillator, an input buffer and a mixer, the input end of the mixer is respectively connected to the voltage-controlled oscillator and the input buffer, the output end of the mixer is connected to the input end of the first matching network, and the output end of the first matching network is connected to the first millimeter wave antenna.

[0028] In an optional embodiment, the first matching network includes a first transformer, a first capacitor and a second capacitor, the first capacitor is connected in parallel to the primary side of the first transformer, the second capacitor is connected in parallel to the secondary side of the first transformer, the primary side of the first transformer is connected to the mixer, and the secondary side of the first transformer is connected to the first millimeter wave antenna.

[0029] In an optional implementation, the receiver includes a second matching network, and the second millimeter wave antenna is connected to the second matching network.

[0030] In an optional implementation, the receiver further includes an amplifier, a demodulator, and an output buffer, and the second millimeter wave antenna, the second matching network, the amplifier, the demodulator, and the output buffer are connected in sequence.

[0031] In an optional implementation, the receiver further includes an envelope detector and an output buffer, and the second millimeter wave antenna, the second matching network, the envelope detector and the output buffer are connected in sequence.

[0032] In an optional implementation, the receiver further includes a demodulator and an output buffer, and the second millimeter wave antenna, the second matching network, the demodulator and the output buffer are connected in sequence.

[0033] In an optional embodiment, the second matching network includes a second transformer, a third capacitor and a fourth capacitor, the third capacitor is connected in parallel to the primary side of the second transformer, the fourth capacitor is connected in parallel to the secondary side of the second transformer, the primary side of the second transformer is connected to the second millimeter wave antenna, and the secondary side of the second transformer is connected to the amplifier.

[0034] In an optional embodiment, the first millimeter wave antenna and the second millimeter wave antenna are arranged in parallel. The parallel arrangement of the millimeter wave antennas is a preferred arrangement of the present invention, which can achieve better transmission efficiency and isolation efficiency, and a smaller substrate occupation area.

[0035] In an optional embodiment, the first millimeter wave antenna and the second millimeter wave antenna each include a first side and a second side arranged opposite to each other, the first side of the first millimeter wave antenna is connected to the transmitter, and the first side of the second millimeter wave antenna is connected to the receiver.

[0036] In an optional embodiment, the first side of the first millimeter wave antenna and the first side of the second millimeter wave antenna are located on the same side, and the second side of the first millimeter wave antenna and the second side of the second millimeter wave antenna are located on the same side.

[0037] In an optional embodiment, the first side of the first millimeter wave antenna and the first side of the second millimeter wave antenna are located on opposite sides, and the second side of the first millimeter wave antenna and the second side of the second millimeter wave antenna are arranged close to each other.

[0038] In an optional implementation, the first millimeter wave antenna is symmetrical to the second millimeter wave antenna.

[0039] In an optional embodiment, the first side of the first millimeter wave antenna and the first side of the second millimeter wave antenna are located on opposite sides, and the second side of the first millimeter wave antenna and the second side of the second millimeter wave antenna are located on opposite sides.

[0040] In an optional implementation, the first millimeter wave antenna is centrally symmetrical to the second millimeter wave antenna.

[0041] The following are specific embodiments.

[0042] 1 to 5 , the first embodiment of the present invention is as follows:

[0043] A high-frequency millimeter-wave digital isolator includes a transmitter 1, a receiver 2, and an integrated isolation device 3. Signals are transmitted between the transmitter 1 and the receiver 2 via the integrated isolation device 3. The integrated isolation device 3 provides galvanic isolation between the transmitter and the receiver, and the galvanic isolation can operate under different supply voltages and / or different voltage domains.

[0044] The transmitter 1 can receive signals of various formats, such as digital data modulated by on-off keying (OOK). Specifically, the transmitter 1 includes a voltage-controlled oscillator 11, an input buffer 12, a mixer 13 and a first matching network 14, the input end of the mixer 13 is respectively connected to the voltage-controlled oscillator 11 and the input buffer 12, and the output end of the mixer 13 is connected to the input end of the first matching network 14. The received signal is provided to the mixer in a timely manner through the input buffer. The mixer is configured to tune the frequency of the received signal based at least in part on a clock signal (e.g., 30 GHz) from the voltage-controlled oscillator. The first matching network is configured to match the output impedance of the transmitter with the input impedance of the integrated isolation device, and to eliminate parasitic effects between the transmitter, the integrated isolation device, etc., and the quality factor of the first matching network is set to form a flat bandpass between the transmitter and the first millimeter wave antenna to reduce jitter.

[0045] The receiver 2 includes a second matching network 21 , an amplifier 22 , a demodulator 23 and an output buffer 24 , which are connected in sequence.

[0046] The integrated isolation device 3 includes a first millimeter wave antenna 31 and a second millimeter wave antenna 32. The first millimeter wave antenna 31 and the second millimeter wave antenna 32 are arranged on the same horizontal plane and placed in parallel. Figures 8 to 14 are schematic diagrams of the structures of millimeter wave antennas in different forms and at different viewing angles.

[0047] An isolation zone 33 is provided between the first millimeter wave antenna 31 and the second millimeter wave antenna 32. The first millimeter wave antenna 31 is connected to the output end of the first matching network 14, and the second millimeter wave antenna 32 is connected to the input end of the second matching network 21, as shown in FIG1 .

[0048] In a specific embodiment, the first matching network is composed of a first transformer T1, a first capacitor C out and the second capacitor CL The first capacitor C out Connected in parallel to the primary side of the first transformer T1, the second capacitor C L The first capacitor C is connected in parallel to the secondary side of the first transformer T1, the primary side of the first transformer T1 is connected to the mixer 13, and the secondary side of the first transformer T1 is connected to the first millimeter wave antenna 31. As shown in Figure 2. out It can be viewed as the output parasitic capacitance of the mixer or its output parasitic capacitance transformer in parallel with the external capacitor, depending on the size of the mixer and the operating frequency. Transformer T1 can be viewed as an ideal transformer T0 in parallel with an inductive inductor L. m (magnetizing inductor) and a leakage inductor L in series k (leakage inductor), the turn ratio of the ideal transformer is n, and the coupling coefficient is k. The equivalent circuit diagram of the first matching network is shown in Figure 3. From the primary side, the load R L is converted to R L / (n / k) 2 , capacitor C L Converted to C L ×(n / k) 2 FIG4 shows an equivalent circuit diagram of the first matching network viewed from the primary side. Therefore, the matching network can be used as a fourth-order band-pass filter.

[0049] In another specific embodiment, the second matching network comprises a second transformer T2, a third capacitor, and a fourth capacitor. The third capacitor is connected in parallel to the primary side of the second transformer T2, and the fourth capacitor is connected in parallel to the secondary side of the second transformer T2. The primary side of the second transformer T2 is connected to the second millimeter-wave antenna 32, and the secondary side of the second transformer T2 is connected to the amplifier 22. As shown in Figure 5, the principles of the second matching network are the same as those of the first matching network and will not be further described here.

[0050] As shown in FIG6 , the second embodiment of the present invention is:

[0051] A high-frequency millimeter-wave digital isolator includes a transmitter 1, a receiver 2, and an integrated isolation device 3. Signals are transmitted between the transmitter 1 and the receiver 2 via the integrated isolation device 3. The integrated isolation device 3 provides galvanic isolation between the transmitter and the receiver, and the galvanic isolation can operate under different supply voltages and / or different voltage domains.

[0052] The transmitter 1 can receive signals of various formats, such as digital data modulated by on-off keying (OOK). Specifically, the transmitter 1 includes a voltage-controlled oscillator 11, an input buffer 12, a mixer 13 and a first matching network 14, the input end of the mixer 13 is respectively connected to the voltage-controlled oscillator 11 and the input buffer 12, and the output end of the mixer 13 is connected to the input end of the first matching network 14. The received signal is provided to the mixer in a timely manner through the input buffer. The mixer is configured to tune the frequency of the received signal based at least in part on a clock signal (e.g., 30 GHz) from the voltage-controlled oscillator. The first matching network is configured to match the output impedance of the transmitter with the input impedance of the integrated isolation device, and to eliminate parasitic effects between the transmitter, the integrated isolation device, etc., and the quality factor of the first matching network is set to form a flat bandpass between the transmitter and the first millimeter wave antenna to reduce jitter.

[0053] The receiver 2 includes a second matching network 21 , an envelope detector 25 and an output buffer 24 , which are connected in sequence.

[0054] The integrated isolation device 3 includes a first millimeter-wave antenna 31, a second millimeter-wave antenna 32, and an isolation strip 33. The isolation strip 33 is provided between the first millimeter-wave antenna 31 and the second millimeter-wave antenna 32. The first millimeter-wave antenna 31 is connected to the output of the first matching network 14, and the second millimeter-wave antenna 32 is connected to the input of the second matching network 21. The details of the first matching network 14 and the second matching network 21 can be found in the above-mentioned embodiment 1 and will not be repeated here.

[0055] The first millimeter wave antenna 31 and the second millimeter wave antenna 32 are arranged on the same horizontal plane. In a preferred embodiment, the first millimeter wave antenna 31 and the second millimeter wave antenna 32 are arranged in parallel.

[0056] As shown in FIG7 , the third embodiment of the present invention is:

[0057] A high-frequency millimeter-wave digital isolator differs from the above-mentioned second embodiment in that the envelope detector 25 is replaced by a demodulator 25 ′ capable of producing the same function.

[0058] As shown in FIG8-FIG10, the fourth embodiment of the present invention is:

[0059] A high-frequency millimeter-wave digital isolator differs from the above-described embodiment in that the first millimeter-wave antenna 31 and the second millimeter-wave antenna 32 each include a first side and a second side disposed opposite each other. The first side of the first millimeter-wave antenna 31 is connected to the transmitter 1 via a wire, and the first side of the second millimeter-wave antenna 32 is connected to the receiver 2 via a wire. The first side of the first millimeter-wave antenna 31 and the first side of the second millimeter-wave antenna 32 are located on the same side, and the second side of the first millimeter-wave antenna 31 and the second side of the second millimeter-wave antenna 32 are located on the same side.

[0060] In a preferred embodiment, the first millimeter wave antenna 31 and the second millimeter wave antenna 32 are symmetrical.

[0061] As shown in FIG11 and FIG12 , the fifth embodiment of the present invention is:

[0062] A high-frequency millimeter-wave digital isolator differs from the above-mentioned embodiment in that the first side of the first millimeter-wave antenna 31 and the first side of the second millimeter-wave antenna 32 are located on opposite sides, and the second side of the first millimeter-wave antenna 31 and the second side of the second millimeter-wave antenna 32 are located on opposite sides.

[0063] In a preferred embodiment, the first millimeter wave antenna 31 and the second millimeter wave antenna 32 are centrosymmetrical.

[0064] As shown in FIG13 and FIG14 , the sixth embodiment of the present invention is:

[0065] A high-frequency millimeter-wave digital isolator differs from the above-mentioned embodiment in that the first side of the first millimeter-wave antenna 313 and the first side of the second millimeter-wave antenna 32 are located on opposite sides, and the second side of the first millimeter-wave antenna 31 and the second side of the second millimeter-wave antenna 32 are arranged close to each other.

[0066] In a preferred embodiment, the first millimeter wave antenna 31 and the second millimeter wave antenna 32 are symmetrical.

[0067] It should be noted that the millimeter wave antenna structures listed in the above-mentioned embodiments 4 to 6 are only some preferred antenna structures of the embodiments of the present invention, and the antenna structures protected by the present invention are not limited to the above-mentioned forms.

[0068] In summary, the high-frequency millimeter-wave digital isolator of the present invention can simultaneously ensure high transmission efficiency and high isolation efficiency. The two millimeter-wave antennas are arranged in parallel on the same horizontal plane, effectively avoiding the risk of collapse and circuit breakage. Furthermore, the two millimeter-wave antennas utilize near-field transmission, resulting in low losses and effective resistance to interference from transient common-mode voltage fluctuations. The receiver uses an envelope detector instead of an amplifier-and-demodulator design, effectively reducing power consumption.

[0069] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Therefore, any modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A high-frequency millimeter-wave digital isolator, comprising a transmitter and a receiver, characterized in that, It further includes an integrated isolation device, and the integrated isolation device includes a first millimeter-wave antenna and a second millimeter-wave antenna. The first millimeter-wave antenna and the second millimeter-wave antenna are arranged on the same horizontal plane, and an isolation zone is provided between the first millimeter-wave antenna and the second millimeter-wave antenna. The first millimeter-wave antenna is connected to a transmitter, the second millimeter-wave antenna is connected to a receiver, and signals are transmitted between the transmitter and the receiver through the integrated isolation device.

2. The high-frequency millimeter-wave digital isolator according to claim 1, wherein The transmitter includes a first matching network, and the first millimeter-wave antenna is connected to the first matching network.

3. The high-frequency millimeter-wave digital isolator according to claim 2, characterized in that The transmitter further includes a voltage-controlled oscillator, an input buffer, and a mixer. The input ends of the mixer are respectively connected to the voltage-controlled oscillator and the input buffer, the output end of the mixer is connected to the input end of the first matching network, and the output end of the first matching network is connected to the first millimeter-wave antenna.

4. The high-frequency millimeter-wave digital isolator according to claim 3, wherein, The first matching network includes a first transformer, a first capacitor, and a second capacitor. The first capacitor is connected in parallel to the primary side of the first transformer, the second capacitor is connected in parallel to the secondary side of the first transformer, the primary side of the first transformer is connected to the mixer, and the secondary side of the first transformer is connected to the first millimeter-wave antenna.

5. The high-frequency millimeter-wave digital isolator according to claim 1, characterized in that, The receiver includes a second matching network, and the second millimeter-wave antenna is connected to the second matching network.

6. The high-frequency millimeter-wave digital isolator according to claim 5, wherein The receiver further includes an amplifier, a demodulator, and an output buffer. The second millimeter-wave antenna, the second matching network, the amplifier, the demodulator, and the output buffer are connected in sequence.

7. The high-frequency millimeter-wave digital isolator according to claim 5, characterized in that The receiver further includes an envelope detector and an output buffer. The second millimeter-wave antenna, the second matching network, the envelope detector, and the output buffer are connected in sequence.

8. The high-frequency millimeter-wave digital isolator according to claim 5, characterized in that The receiver further includes a demodulator and an output buffer. The second millimeter-wave antenna, the second matching network, the demodulator, and the output buffer are connected in sequence.

9. The high-frequency millimeter-wave digital isolator according to any one of claims 6-8, characterized in that, The second matching network includes a second transformer, a third capacitor, and a fourth capacitor. The third capacitor is connected in parallel to the primary side of the second transformer, the fourth capacitor is connected in parallel to the secondary side of the second transformer, the primary side of the second transformer is connected to the second millimeter-wave antenna, and the secondary side of the second transformer is connected to the amplifier.

10. The high-frequency millimeter-wave digital isolator according to claim 1, wherein The first millimeter-wave antenna and the second millimeter-wave antenna are arranged in parallel.

11. The high-frequency millimeter-wave digital isolator according to claim 1, characterized in that, Both the first millimeter-wave antenna and the second millimeter-wave antenna include a first side and a second side that are oppositely arranged. The first side of the first millimeter-wave antenna is connected to the transmitter, and the first side of the second millimeter-wave antenna is connected to the receiver.

12. The high-frequency millimeter-wave digital isolator according to claim 11, wherein The first side of the first millimeter-wave antenna and the first side of the second millimeter-wave antenna are on the same side, and the second side of the first millimeter-wave antenna and the second side of the second millimeter-wave antenna are on the same side.

13. The high-frequency millimeter-wave digital isolator according to claim 11, characterized in that, The first side of the first millimeter-wave antenna and the first side of the second millimeter-wave antenna are on opposite sides, and the second side of the first millimeter-wave antenna and the second side of the second millimeter-wave antenna are arranged close to each other.

14. The high-frequency millimeter-wave digital isolator according to claim 12 or 13, characterized in that, The first millimeter-wave antenna and the second millimeter-wave antenna are symmetrical.

15. The high-frequency millimeter-wave digital isolator according to claim 11, wherein The first side of the first millimeter-wave antenna and the first side of the second millimeter-wave antenna are on opposite sides, and the second side of the first millimeter-wave antenna and the second side of the second millimeter-wave antenna are on opposite sides.

16. The high-frequency millimeter-wave digital isolator according to claim 15, characterized in that, The first millimeter-wave antenna and the second millimeter-wave antenna are centrosymmetric.

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