Differential amplification circuit based on millimeter wave isolation and equipment thereof

Abstract

The utility model provides a differential amplification circuit based on millimeter wave isolation and equipment thereof. The differential amplification circuit comprises a fully differential operational amplifier, a modulator, a first radio frequency circuit, a millimeter wave isolation circuit, a second radio frequency circuit and a low-pass filter which are connected in sequence. The millimeter wave isolation circuit further comprises a clock circuit, and the clock circuit is arranged on one side, close to the modulator or close to the low-pass filter, of an isolation strip in the millimeter wave isolation circuit. According to the utility model, high-bandwidth and low-delay data transmission is supported; and the ultrahigh isolation voltage endurance capability can be realized, and the CMTI capability can be improved at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical coupling devices, in particular to a differential amplifier circuit and equipment based on millimeter-wave isolation. Background Art

[0002] A digital isolation circuit is an intermediate circuit between a digital signal transmitting circuit and a receiving circuit, used to isolate the interference between the transmitting circuit and the receiving circuit, and ensure that different electrical devices communicate. For example, the communication between a weak-current circuit and a strong-current circuit is to prevent interference between circuits in different voltage domains.

[0003] The traditional isolation scheme for differential amplifiers is generally a capacitive coupling isolation scheme, which has the disadvantages of low speed and large transmission delay; in addition, limited by the process, its isolation withstand voltage ability and CMTI cannot be improved to meet higher application requirements. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a differential amplifier circuit and equipment based on millimeter-wave isolation, which not only support high-bandwidth and low-delay data transmission, but also can achieve ultra-high isolation withstand voltage ability and improve CMTI ability at the same time.

[0005] To solve the above technical problem, the first technical solution adopted by the utility model is:

[0006] A differential amplifier circuit based on millimeter-wave isolation, comprising: a fully differential operational amplifier, a modulator, a first radio frequency circuit, a millimeter-wave isolation circuit, a second radio frequency circuit, and a low-pass filter connected in sequence.

[0007] Optionally, it further includes a clock circuit; the clock circuit is arranged on one side close to the low-pass filter with the isolation band in the millimeter-wave isolation circuit as the boundary; the clock circuit is respectively connected to the low-pass filter and the second radio frequency circuit.

[0008] Optionally, the first radio frequency circuit includes a first radio frequency transmitting circuit and a first radio frequency receiving circuit; the second radio frequency circuit includes a second radio frequency transmitting circuit and a second radio frequency receiving circuit; the millimeter-wave isolation circuit includes a first millimeter-wave transmitting antenna, a first millimeter-wave receiving antenna, a second millimeter-wave transmitting antenna, and a second millimeter-wave receiving antenna;

[0009] The first radio frequency transmitting circuit is connected to the first millimeter-wave transmitting antenna; the first millimeter-wave transmitting antenna is wirelessly connected to the second millimeter-wave receiving antenna based on millimeter waves; the second millimeter-wave receiving antenna is connected to the second radio frequency receiving circuit;

[0010] The second radio frequency transmitting circuit is respectively connected to the clock circuit and the second millimeter wave transmitting antenna; the second millimeter wave transmitting antenna is wirelessly connected to the first millimeter wave receiving antenna based on millimeter waves; the first millimeter wave receiving antenna is connected to the first radio frequency receiving circuit.

[0011] Optionally, it further includes a clock circuit; the clock circuit is arranged on a side close to the modulator with the isolation band in the millimeter wave isolation circuit as the boundary; the clock circuit is respectively connected to the modulator and the first radio frequency circuit.

[0012] Optionally, the first radio frequency circuit includes a first radio frequency transmitting circuit and a second radio frequency transmitting circuit; the second radio frequency circuit includes a first radio frequency receiving circuit and a second radio frequency receiving circuit; the millimeter wave isolation circuit includes a first millimeter wave transmitting antenna, a first millimeter wave receiving antenna, a second millimeter wave transmitting antenna and a second millimeter wave receiving antenna;

[0013] The first radio frequency transmitting circuit is connected to the first millimeter wave transmitting antenna; the first millimeter wave transmitting antenna is wirelessly connected to the first millimeter wave receiving antenna based on millimeter waves; the second millimeter wave transmitting antenna is connected to the second radio frequency receiving circuit;

[0014] The second radio frequency transmitting circuit is respectively connected to the clock circuit and the second millimeter wave transmitting antenna; the second millimeter wave transmitting antenna is wirelessly connected to the second millimeter wave receiving antenna based on millimeter waves; the second millimeter wave receiving antenna is connected to the second radio frequency receiving circuit.

[0015] Optionally, it further includes a pre - buffer circuit; the fully differential operational amplifier is connected to the modulator through the pre - buffer circuit.

[0016] Optionally, the pre - buffer circuit includes a first buffer circuit and a second buffer circuit; the positive output terminal of the fully differential operational amplifier is connected to the first input terminal of the modulator through the first buffer circuit; the negative output terminal of the fully differential operational amplifier is connected to the second input terminal of the modulator through the second buffer circuit.

[0017] Optionally, the millimeter wave isolation circuit is a millimeter wave isolation chip.

[0018] The second technical solution adopted by the present utility model is:

[0019] A device of a differential amplification circuit based on millimeter wave isolation includes the above - mentioned differential amplification circuit based on millimeter wave isolation.

[0020] The beneficial effects of the present utility model are as follows: A millimeter-wave isolation circuit is adopted to achieve isolated communication transmission between the input and output of a differential amplifier circuit. Since millimeter-wave isolation supports high-bandwidth and low-latency data transmission; at the same time, the isolation distance (DTI) can also be defined according to requirements, and can reach up to the centimeter level at most. The increase of DTI will cause the parasitic capacitance to decrease accordingly, and the CMTI ability will be greatly improved. Therefore, the differential amplifier circuit based on millimeter-wave isolation provided in this embodiment not only has excellent communication quality with high bandwidth and low latency; but also can achieve ultra-high isolation withstand voltage ability and CMTI ability. Brief Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a differential amplifier circuit based on millimeter-wave isolation provided by an embodiment of the present utility model;

[0022] Figure 2 It is one setting method of the clock circuit in the differential amplifier circuit provided by the specific implementation manner of the present utility model;

[0023] Figure 3 It is another setting method of the clock circuit in the differential amplifier circuit provided by the specific implementation manner of the present utility model. Specific Embodiment

[0024] To describe in detail the technical content, the achieved purpose and the effects of the present utility model, the following is described in conjunction with the embodiments and with reference to the drawings.

[0025] The most crucial concept of the present utility model lies in: applying millimeter-wave isolation technology to the isolated communication transmission between the input and output in a differential amplifier circuit, which can not only optimize the communication quality, but also achieve ultra-high isolation withstand voltage ability and CMTI ability.

[0026] Please refer to Figure 1 , Embodiment 1 of the present utility model is as follows:

[0027] This embodiment provides a differential amplifier circuit based on millimeter-wave isolation, including: a fully differential operational amplifier AMP, a modulator Σ-ΔModulator, a first radio frequency circuit RF1, a millimeter-wave isolation circuit M, a second radio frequency circuit RF2, and a low-pass filter LPF (i.e., Low-Pass Filter), which are connected in sequence.

[0028] The working principle of the above differential amplifier circuit based on millimeter-wave isolation is as follows:

[0029] The fully differential operational amplifier AMP amplifies the tiny differential signal to a specified range and then outputs it to the modulator Σ-Δ Modulator for processing such as sampling, holding, and comparison, and then converts it into bitstream data for output; after the bitstream data is converted into a radio frequency electrical signal by the first radio frequency circuit RF1, it is sent to one end of the millimeter-wave isolation circuit M; after the millimeter-wave isolation circuit M converts the radio frequency electrical signal into a corresponding millimeter-wave wireless signal, based on the millimeter-wave wireless isolation transmission technology, the millimeter-wave wireless signal is transmitted to the other end of the isolation band; then the received millimeter-wave wireless signal is converted into a corresponding radio frequency electrical signal and transmitted to the second radio frequency circuit RF2; after the second radio frequency circuit RF2 restores the radio frequency electrical signal into the corresponding bitstream data, it is sent to the low-pass filter LPF for decimation filtering processing and then converted into a differential analog signal for output.

[0030] For the differential amplifier circuit based on millimeter-wave isolation provided in this embodiment, by using the millimeter-wave isolation circuit for wireless isolation communication transmission at the input and output of the differential amplifier circuit, benefiting from the advantages of low delay and high bandwidth of millimeter-wave isolation, the differential amplifier circuit described in the present utility model will be significantly improved in communication quality; at the same time, benefiting from the fact that millimeter-wave isolation has DTI that can be defined according to requirements and can even reach the centimeter level, the differential amplifier circuit described in the present utility model will have ultra-high isolation withstand voltage capability, and as DTI increases, the parasitic capacitance will decrease accordingly, and the CMTI capability will also be significantly improved.

[0031] In this embodiment, the differential amplifier circuit based on millimeter-wave isolation further includes a clock circuit OSC.

[0032] The clock circuit is used to provide the reference clock required for the circuit operation on both sides of the isolation band. Specifically, one path of the clock signal of the clock circuit OSC is given to the low-pass filter LPF, and the other path is given to the modulator Σ-Δ Modulator.

[0033] The clock circuit OSC can be arranged on one side close to the low-pass filter LPF or on one side close to the modulator with the isolation band in the millimeter-wave isolation circuit as the boundary.

[0034] In some specific embodiments of this embodiment, as Figure 2 shown, the clock circuit OSC is arranged on the right side of the isolation band, that is, on one side close to the low-pass filter LPF with the isolation band in the millimeter-wave isolation circuit as the boundary.

[0035] Here, the clock circuit OSC is respectively connected to the low-pass filter LPF and the second radio frequency circuit RF2. Correspondingly, both the first radio frequency circuit RF1 and the second radio frequency circuit RF2 are full-duplex radio frequency circuits, with both transmitting and receiving capabilities. The clock signal output by the clock circuit OSC will be directly sent to the low-pass filter LPF on one path, and on the other path, it will be wirelessly isolated and transmitted to the first radio frequency circuit RF1 through the second radio frequency circuit RF2 via the millimeter-wave isolation circuit M, and then sent to the modulator Σ-ΔModulator as the sampling clock.

[0036] Specifically, as Figure 2 shown, the first radio frequency circuit RF1 includes a first radio frequency transmitting circuit RF_TX1 and a first radio frequency receiving circuit RF_RX1; the second radio frequency circuit RF2 includes a second radio frequency transmitting circuit RF_TX2 and a second radio frequency receiving circuit RF_RX2; the millimeter-wave isolation circuit M includes a first millimeter-wave transmitting antenna ANT_TX1, a first millimeter-wave receiving antenna ANT_RX1, a second millimeter-wave transmitting antenna ANT_TX2, and a second millimeter-wave receiving antenna ANT_RX2;

[0037] The first radio frequency transmitting circuit RF_TX1 is connected to the first millimeter-wave transmitting antenna ANT_TX1; the first millimeter-wave transmitting antenna ANT_TX1 is wirelessly connected to the second millimeter-wave receiving antenna ANT_RX2 based on millimeter waves; the second millimeter-wave receiving antenna ANT_RX2 is connected to the second radio frequency receiving circuit RF_RX2;

[0038] The second radio frequency transmitting circuit RF_TX2 is respectively connected to the clock circuit OSC and the second millimeter-wave transmitting antenna ANT_TX2; the second millimeter-wave transmitting antenna ANT_TX2 is wirelessly connected to the first millimeter-wave receiving antenna ANT_RX1 based on millimeter waves; the first millimeter-wave receiving antenna ANT_RX1 is connected to the first radio frequency receiving circuit RF_RX1.

[0039] Here, as Figure 2 shown, the bitstream data output by the modulator Σ-ΔModulator is transmitted to the first radio frequency transmitting circuit RF_TX1, which converts it into a corresponding radio frequency electrical signal and then sends it to the first millimeter-wave transmitting antenna ANT_TX1; the first millimeter-wave transmitting antenna ANT_TX1 converts the radio frequency electrical signal into a corresponding millimeter-wave wireless signal and then wirelessly isolates and transmits it to the second millimeter-wave receiving antenna ANT_RX2 based on millimeter waves; the second millimeter-wave receiving antenna ANT_RX2 receives and converts it into a corresponding radio frequency electrical signal, and then transmits it to the second radio frequency receiving circuit RF_RX2 to restore it into a corresponding bitstream data, and then transmits it to the low-pass filter LPF;

[0040] For the clock signal output by the clock circuit OSC, one path will be directly fed to the low-pass filter LPF; the other path will be converted into a corresponding radio frequency electrical signal by the second radio frequency transmission circuit RF_TX2, and then transmitted to the second millimeter-wave transmission antenna ANT_TX2 to be converted into a corresponding millimeter-wave wireless signal, and then transmitted to the first millimeter-wave receiving antenna ANT_RX1 based on millimeter-wave wireless isolation; the first millimeter-wave receiving antenna ANT_RX1 will convert it into a corresponding radio frequency electrical signal and then transmit it to the first radio frequency receiving circuit RF_RX1; the first radio frequency receiving circuit RF_RX1 will restore it into a digital clock signal and feed it to the modulator Σ-ΔModulator as its sampling clock.

[0041] In some other specific embodiments of this embodiment, as Figure 3 shown, the clock circuit is arranged on the left side of the isolation band, that is, bounded by the isolation band in the millimeter-wave isolation circuit, on the side close to the modulator LPF.

[0042] Here, the clock circuit OSC is respectively connected to the modulator Σ-ΔModulator and the first radio frequency circuit. Correspondingly, both the first radio frequency circuit and the second radio frequency circuit are full-duplex radio frequency circuits and have both transmitting and receiving capabilities. The clock signal output by the clock circuit will be directly fed to the modulator in one path, and in the other path, it will be wirelessly isolated and transmitted to the second radio frequency circuit through the first radio frequency circuit via the millimeter-wave isolation circuit, and then fed to the low-pass filter.

[0043] Specifically, as Figure 3 shown, the first radio frequency circuit includes a first radio frequency transmission circuit RF_TX1 and a second radio frequency transmission circuit RF_TX2; the second radio frequency circuit includes a first radio frequency receiving circuit RF_RX1 and a second radio frequency receiving circuit RF_RX2; the millimeter-wave isolation circuit includes a first millimeter-wave transmission antenna ANT_TX1, a first millimeter-wave receiving antenna ANT_RX1, a second millimeter-wave transmission antenna ANT_TX2, and a second millimeter-wave receiving antenna ANT_RX2;

[0044] The first radio frequency transmission circuit RF_TX1 is connected to the first millimeter-wave transmission antenna ANT_TX1; the first millimeter-wave transmission antenna ANT_TX1 is wirelessly connected to the first millimeter-wave receiving antenna ANT_RX1 based on millimeter waves; the second millimeter-wave transmission antenna ANT_TX2 is connected to the second radio frequency receiving circuit RF_RX2;

[0045] The second radio frequency transmitting circuit RF_TX2 is respectively connected to the clock circuit OSC and the second millimeter-wave transmitting antenna ANT_TX2; the second millimeter-wave transmitting antenna ANT_TX2 is wirelessly connected to the second millimeter-wave receiving antenna ANT_RX2 based on millimeter waves; the second millimeter-wave receiving antenna ANT_RX2 is connected to the second radio frequency receiving circuit RF_RX2.

[0046] Here, as Figure 3 shown, the bit stream data output by the modulator Σ-Δ Modulator is transmitted to the first radio frequency transmitting circuit RF_TX1, which converts it into a corresponding radio frequency electrical signal and then sends it to the first millimeter-wave transmitting antenna ANT_TX1; after the first millimeter-wave transmitting antenna ANT_TX1 converts the radio frequency electrical signal into a corresponding millimeter-wave wireless signal, it is wirelessly isolated and transmitted to the first millimeter-wave receiving antenna ANT_RX1 based on millimeter waves; the first millimeter-wave receiving antenna ANT_RX1 receives and converts it into a corresponding radio frequency electrical signal, and then transmits it to the first radio frequency receiving circuit RF_RX1 to restore it into a corresponding bit stream data, and then transmits it to the low-pass filter LPF.

[0047] For the clock signal output by the clock circuit OSC, one path will be directly given to the modulator Σ-Δ Modulator; the other path is converted into a corresponding radio frequency electrical signal through the second radio frequency transmitting circuit RF_TX2, and then transmitted to the second millimeter-wave transmitting antenna ANT_TX2 to be converted into a corresponding millimeter-wave wireless signal, and then wirelessly isolated and transmitted to the second millimeter-wave receiving antenna ANT_RX2 based on millimeter waves; the second millimeter-wave receiving antenna ANT_RX2 then converts it into a corresponding radio frequency electrical signal and transmits it to the second radio frequency receiving circuit RF_RX2; the second radio frequency receiving circuit RF_RX2 restores it into a digital clock signal and gives it to the low-pass filter LPF.

[0048] In the above specific implementation manner, placing the clock circuit OSC on one side of the modulator Σ-Δ Modulator can minimize the influence of the millimeter-wave isolation circuit on the clock accuracy and sampling accuracy.

[0049] In this embodiment, thanks to the advantages of low delay, low jitter, and high speed of millimeter-wave isolation, by using a millimeter-wave isolation circuit to transmit the clock signal, the accuracy of the clock can be maintained to the greatest extent, thereby ensuring the SNR performance of the entire system.

[0050] In some other specific implementation manners of this embodiment, the differential amplifier circuit based on millimeter-wave isolation further includes a pre-buffer circuit; the fully differential operational amplifier is connected to the modulator through the pre-buffer circuit.

[0051] Here, the pre-buffer circuit, as the pre-buffer circuit for the input of the Σ-Δ modulator, can increase the input resistance and at the same time decrease the output resistance, thereby preventing the internal circuit of the Σ-Δ modulator from affecting the input signal.

[0052] As a specific example, such as Figure 2 or Figure 3 shown, the pre-buffer circuit includes a first buffer circuit BUF1 and a second buffer circuit BUF2; the positive output terminal of the fully differential operational amplifier AMP is connected to the first input terminal of the modulator Σ-Δ Modulator via the first buffer circuit BUF1; the negative output terminal of the fully differential operational amplifier AMP is connected to the second input terminal of the modulator Σ-Δ Modulator via the second buffer circuit BUF2.

[0053] Here, for the two differential signal output terminals, a corresponding buffer circuit is respectively set for targeted processing to achieve the best effect.

[0054] In some further specific embodiments of this embodiment, the millimeter-wave isolation circuit is a millimeter-wave isolation chip. The setting of the isolation circuit as an integrated chip helps the miniaturized design of the device.

[0055] Embodiment 2 of the present utility model is:

[0056] This embodiment is a further expansion based on Embodiment 1, and provides an electronic device including the differential amplification circuit based on millimeter-wave isolation described above.

[0057] Here, the specific structure of the differential amplification circuit based on millimeter-wave isolation will not be repeated, and for details, please refer to the description of Embodiment 1.

[0058] In this embodiment, for any electronic device that uses a differential amplification circuit, the input and output of its differential amplification circuit will use millimeter-wave technology for isolated communication transmission. Since millimeter-wave isolation supports high-bandwidth and low-latency data transmission; at the same time, the isolation distance (DTI) can also be defined according to requirements, and can reach the centimeter level at most. The increase of DTI will cause the parasitic capacitance to decrease accordingly, and the CMTI ability will be greatly improved. Therefore, for the isolation part of the differential amplification circuit of the electronic device provided in this embodiment, it not only has the advantages of high bandwidth and low latency; but also can achieve ultra-high isolation withstand voltage ability and CMTI ability; furthermore, the performance of the electronic device in this embodiment will be optimized to a certain extent.

[0059] The above are only embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A differential amplifier circuit based on millimeter wave isolation, characterized in that: include: A fully differential operational amplifier, a modulator, a first radio frequency circuit, a millimeter wave isolation circuit, a second radio frequency circuit and a low-pass filter connected in sequence; It also includes a pre-buffer circuit; the fully differential operational amplifier is connected to the modulator through the pre-buffer circuit.

2. The differential amplifier circuit based on millimeter wave isolation as claimed in claim 1, characterized in that: It also includes a clock circuit; the clock circuit is arranged on a side close to the low-pass filter with the isolation band in the millimeter wave isolation circuit as the boundary; the clock circuit is respectively connected to the low-pass filter and the second radio frequency circuit.

3. The differential amplifier circuit based on millimeter wave isolation as claimed in claim 2, characterized in that: The first radio frequency circuit includes a first radio frequency transmitting circuit and a first radio frequency receiving circuit; the second radio frequency circuit includes a second radio frequency transmitting circuit and a second radio frequency receiving circuit; the millimeter wave isolation circuit includes a first millimeter wave transmitting antenna, a first millimeter wave receiving antenna, a second millimeter wave transmitting antenna and a second millimeter wave receiving antenna; The first radio frequency transmitting circuit is connected to the first millimeter wave transmitting antenna; The first millimeter wave transmitting antenna and the second millimeter wave receiving antenna are wirelessly connected based on millimeter waves; The second millimeter wave receiving antenna is connected to the second radio frequency receiving circuit; The second radio frequency transmitting circuit is connected to the clock circuit and the second millimeter wave transmitting antenna respectively; The second millimeter wave transmitting antenna is wirelessly connected to the first millimeter wave receiving antenna based on the millimeter wave; The first millimeter wave receiving antenna is connected to the first radio frequency receiving circuit.

4. The differential amplifier circuit based on millimeter wave isolation as claimed in claim 1, characterized in that: It also includes a clock circuit; the clock circuit is arranged on a side close to the modulator with the isolation band in the millimeter wave isolation circuit as the boundary; the clock circuit is connected to the modulator and the first radio frequency circuit respectively.

5. The differential amplifier circuit based on millimeter wave isolation as claimed in claim 4, characterized in that: The first radio frequency circuit includes a first radio frequency transmitting circuit and a second radio frequency transmitting circuit; the second radio frequency circuit includes a first radio frequency receiving circuit and a second radio frequency receiving circuit; the millimeter wave isolation circuit includes a first millimeter wave transmitting antenna, a first millimeter wave receiving antenna, a second millimeter wave transmitting antenna and a second millimeter wave receiving antenna; The first radio frequency transmitting circuit is connected to the first millimeter wave transmitting antenna; The first millimeter wave transmitting antenna is wirelessly connected to the first millimeter wave receiving antenna based on millimeter waves; The second millimeter wave transmitting antenna is connected to the second radio frequency receiving circuit; The second radio frequency transmitting circuit is connected to the clock circuit and the second millimeter wave transmitting antenna respectively; The second millimeter wave transmitting antenna is wirelessly connected to the second millimeter wave receiving antenna based on the millimeter wave; The second millimeter wave receiving antenna is connected to the second radio frequency receiving circuit.

6. The differential amplifier circuit based on millimeter wave isolation according to claim 1, characterized in that: The pre-buffer circuit includes a first buffer circuit and a second buffer circuit; the positive output end of the fully differential operational amplifier is connected to the first input end of the modulator via the first buffer circuit; the negative output end of the fully differential operational amplifier is connected to the second input end of the modulator via the second buffer circuit.

7. The differential amplifier circuit based on millimeter wave isolation according to claim 1, characterized in that: The millimeter wave isolation circuit is a millimeter wave isolation chip.

8. A device based on a millimeter wave isolation differential amplifier circuit, characterized in that: A differential amplifier circuit based on millimeter wave isolation comprising any one of claims 1 to 7.

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