Laser radar receiving front-end circuit, optical circuit and chip

Abstract

The invention relates to the technical field of integrated circuits, in particular to a laser radar receiving front-end circuit, an optical circuit and a chip, the circuit comprises a total input end, a total output end, an input module, an intermediate module and an output module, the input module comprises a first input end, a first output end, a first power connection end and a first grounding end; the intermediate module comprises a second input end, a second output end, a second power connection end and a second grounding end; the output module comprises a third input end, a third output end, a third power connection end and a third grounding end; the first input end is electrically connected with the total input end, the first output end is electrically connected with the second input end, the first power connection end is electrically connected with the second grounding end, and the first grounding end is grounded; the second output end is electrically connected with the third input end, and the second grounding end is electrically connected with the third grounding end; the third output end is electrically connected with the total output end, and the third power connection end is connected with a power supply. The circuit is low in power consumption and high in current efficiency.

Description

Technical Field

[0001] The present invention relates to the field of integrated circuit technology, and in particular to a laser radar receiving front-end circuit, an optical circuit and a chip. Background Art

[0002] The rapid development and maturity of the LiDAR industry chain has further expanded its applications in areas such as autonomous driving robots, unmanned delivery, mapping, drones, security, industry, agriculture, and smart cities. This also puts forward higher performance requirements for LiDAR, including distance measurement capability, ranging accuracy, ranging precision, integration, and power consumption.

[0003] Among them, with the further demand for chip miniaturization and integration, the issue of low-power design has become increasingly important. Lower chip power consumption means that the supporting system can be used for a longer time, the reduced power consumption increases the life of the chip, the heat dissipation problem is controlled, the system's energy utilization rate is higher, the size of the equipment can be made smaller, thereby increasing the maintenance cost of the terminal operator and so on. Therefore, it is an objective requirement to reduce the power consumption of the chip and the system as much as possible, and reducing the current consumption is a more essential goal. In the LiDAR system, it mainly includes the laser transmitting end, the scanning end, the optoelectronic module and the receiving end. Among them, the receiving end circuit, as the first entrance for processing signals, is responsible for receiving and processing the target echo signal, and therefore plays a vital role. In order to pursue better performance indicators, the current design ideas of the LiDAR receiving end circuit are often as follows: Figure 1 As shown, it includes a total input terminal, a total output terminal, an input module, an intermediate module and an output module. The input module, the intermediate module and the output module are connected in series in sequence, and the ground terminal is grounded, and the power terminals are connected to the power supply. This design idea leads to a large total current consumption of the front-end receiving circuit, which in turn leads to a large power consumption of the front-end receiving circuit. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a laser radar receiving front-end circuit, optical circuit and chip in response to the above-mentioned deficiencies in the prior art, with the aim of solving the problem of large total current consumption of the current front-end receiving circuit resulting in large power consumption.

[0005] The objective of the present invention is achieved by the following technical solutions:

[0006] In a first aspect, the present invention provides a laser radar receiving front-end circuit, comprising a total input terminal, a total output terminal, an input module, an intermediate module and an output module, wherein the input module comprises a first input terminal, a first output terminal, a first power terminal and a first ground terminal; the intermediate module comprises a second input terminal, a second output terminal, a second power terminal and a second ground terminal; the output module comprises a third input terminal, a third output terminal, a third power terminal and a third ground terminal;

[0007] The first input terminal is electrically connected to the total input terminal, the first output terminal is electrically connected to the second input terminal, the first power terminal is electrically connected to the second ground terminal, and the first ground terminal is grounded; the second output terminal is electrically connected to the third input terminal, and the second power terminal is electrically connected to the third ground terminal; the third output terminal is electrically connected to the total output terminal, and the third power terminal is used to connect to a power supply.

[0008] As a further improvement of the present invention, the receiving front-end circuit also includes a voltage stabilizing module, which is respectively arranged between the input module and the intermediate module and between the intermediate module and the output module, and is used to stabilize the voltage of the intermediate module and / or the input module.

[0009] As a further improvement of the present invention, the voltage stabilizing module includes a first voltage stabilizer and a second voltage stabilizer;

[0010] The first voltage stabilizer comprises a first connection terminal, the first voltage stabilizer is connected between the first power connection terminal and the second ground terminal according to the first connection terminal, and is used to stabilize the voltage domain of the input module;

[0011] The second voltage stabilizer comprises a second connection terminal connected between the second power connection terminal and the third ground terminal, and the second voltage stabilizer is used to stabilize the voltage domain of the intermediate module.

[0012] As a further improvement of the present invention, both the first voltage regulator and the second voltage regulator are low-voltage linear voltage regulators, and the output power tube of the low-voltage linear voltage regulator is a class-AB structure.

[0013] As a further improvement of the present invention, when the current of the intermediate module matches the current of the input module, the first regulator has no input or output current;

[0014] When the current of the output module matches the current of the intermediate module, the second regulator has no input or output current.

[0015] As a further improvement of the present invention, the receiving front-end circuit also includes an isolation module, which is respectively arranged between the first output end of the input module and the second input end of the intermediate module, and between the second output end of the intermediate module and the third input end of the output module, and is used to isolate the voltage domains between the input module and the intermediate module, and between the intermediate module and the output module.

[0016] As a further improvement of the present invention, the isolation module includes a first isolation capacitor and a second isolation capacitor;

[0017] The first end of the first isolation capacitor is electrically connected to the first output end, and the second end of the first isolation capacitor is electrically connected to the second input end, for isolating the input module from the intermediate module, so that the voltage domain of the input module and the voltage domain of the intermediate module are independent of each other;

[0018] The first end of the second isolation capacitor is electrically connected to the second output end, and the second end of the second isolation capacitor is electrically connected to the third input end, and is used to isolate the intermediate module from the output module, so that the voltage domain of the intermediate module and the voltage domain of the output module are independent of each other.

[0019] As a further improvement of the present invention, the resistance values ​​of the resistors in the input module, the resistors in the intermediate module and the resistors in the output module are different from each other.

[0020] In a second aspect, the present invention provides an optical circuit, the optical circuit comprising a signal conversion module, an analog-to-digital converter and the above-mentioned laser radar receiving front-end circuit;

[0021] The signal conversion module is electrically connected to the total input end of the laser radar receiving front-end circuit, and the total output end of the laser radar receiving front-end circuit is electrically connected to the analog-to-digital converter.

[0022] In a third aspect, the present invention further provides a chip, including a chip body, and the chip body includes the above-mentioned laser radar receiving front-end circuit.

[0023] The beneficial effects of the present invention are as follows: a laser radar receiving front-end circuit provided by the present invention connects the input module, the intermediate module and the output module together in a stacked design manner, and the grounding terminal of the input module is grounded, the power terminal is connected to the grounding terminal of the intermediate module, the wiring terminal of the intermediate module is connected to the grounding terminal of the output module, and the power terminal of the output module is connected to the power supply. Therefore, after the power supply is connected to the third power terminal, the current first flows into the third power terminal, then flows out from the third grounding terminal, then flows into the second power terminal, then flows out from the second grounding terminal, then flows into the first power terminal, and then flows out from the first grounding terminal to the ground, thereby forming a current flow path, and the current can flow. In the process of current flow, it is equivalent to the input module, the intermediate module and the output module multiplexing the current, so that the total current consumption in the front-end receiving circuit is only the current flowing into the third receiving module. Compared with the prior art, the total current consumption in the front-end receiving circuit is the sum of the current flowing into the input module, the current flowing into the intermediate module, and the current flowing into the output module. The total current consumption in the front-end receiving circuit of the present invention is reduced, thereby reducing the power consumption of the front-end receiving circuit. Therefore, the circuit of the present invention can realize current reuse, and at the same time realize higher current efficiency and lower power consumption based on the current reuse.

[0024] Furthermore, a voltage stabilizing module is provided between each module, and the voltage stabilizing module includes multiple low-voltage linear regulators, which serve as the "ground" of the previous module connected and the "power supply" of the next module, becoming an intermediate bridge and are selected as class-AB, that is, they can absorb the leakage current of the previous module connected and provide part of the current for the next module. The low-voltage linear regulator is mainly used to balance the internal current and ensure the current consistency of the upper unit and the lower unit.

[0025] Furthermore, the receiving main path of the circuit is composed of different circuit units, and each circuit unit is independent through an isolation module and completes the power supply of different voltage domains. A current path is formed between each module to realize current reuse. Each module is separated by an isolation capacitor to ensure the signal integrity and independence of each unit circuit.

[0026] An optical circuit, the proposed front-end circuit can be combined with a photodetector, a back-end analog-to-digital converter circuit, etc., to realize signal conversion from the optical domain to the electrical domain. The photodetector converts the optical signal into a current signal, the proposed front-end circuit further completes the tasks of amplification and current-to-voltage conversion, and the back-end circuit performs further signal processing, thereby further realizing the detection function through this circuit.

[0027] A chip, the proposed analog front-end circuit can be used as a separate chip with any photodetector or other chip, and can be fully used in the laser radar system. This chip will provide a smaller current consumption for the laser radar system, thereby further compressing the power consumption contributed by the analog front-end circuit to the system and further improving power efficiency.

[0028] In summary, the present invention proposes a low-power stacked laser radar receiving front-end circuit, optical circuit and chip, which stacks the voltage domains in the channel by folding the circuit units, so that the internal current can be reused, and the chip and system achieve higher power efficiency. It further solves the problem of high power consumption of the receiving front-end circuit and provides an innovative solution for the low-power design of the laser radar receiving end. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of a receiving front-end circuit in the prior art;

[0031] Figure 2 is a schematic diagram of a receiving front-end circuit provided by an embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of an optical circuit provided by an embodiment of the present invention;

[0033] 01: total input terminal; 02: total output terminal; 10: input module; 20: intermediate module; 30: output module; 40: voltage regulator module; 50: isolation module; 11: first input terminal; 12: first output terminal; 13: first power terminal; 14: first ground terminal; 21: second input terminal; 22: second output terminal; 23: second power terminal; 24: second ground terminal; 31: third input terminal; 32: third output terminal; 33: third power terminal; 34: third ground terminal; 41: first voltage regulator; 42: second voltage regulator; 51: first isolation capacitor; 52: second isolation capacitor; 100: signal conversion module; 200: analog-to-digital converter. DETAILED DESCRIPTION

[0034] In order to make the purpose and technical solution of the present invention clearer and easier to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The concept of the present invention is to provide a laser radar receiving front-end circuit, optical circuit and chip. The receiving front-end circuit mainly includes: a total input terminal 01, a total output terminal 02, an input module 10, an intermediate module 20 and an output module 30;

[0036] The input module 10 includes a first input terminal 11, a first output terminal 12, a first power terminal 13 and a first ground terminal 14; the intermediate module 20 includes a second input terminal 21, a second output terminal 22, a second power terminal 23 and a second ground terminal 24; the output module 30 includes a third input terminal 31, a third output terminal 32, a third power terminal 33 and a third ground terminal 34;

[0037] The first input terminal 11 is electrically connected to the total input terminal 01, the first output terminal 12 is electrically connected to the second input terminal 21, the first power terminal 13 is electrically connected to the second ground terminal 24, and the first ground terminal 14 is grounded; the second output terminal 22 is electrically connected to the third input terminal 31, the second power terminal 23 is electrically connected to the third ground terminal 34; the third output terminal 32 is electrically connected to the total output terminal 02, and the third power terminal 33 is used to connect to a power supply.

[0038] The receiving front-end circuit also includes a voltage stabilizing module 40, which is respectively arranged between the input module 10 and the intermediate module 20, and between the intermediate module 20 and the output module 30, for stabilizing the voltage of the intermediate module and / or the input module.

[0039] The voltage stabilizing module 40 includes a first voltage stabilizer 41 and a second voltage stabilizer 42;

[0040] The first voltage stabilizer 41 comprises a first connection terminal, and the first voltage stabilizer is connected between the first power connection terminal 13 and the second ground terminal 24 according to the first connection terminal, and is used to stabilize the voltage domain of the input module;

[0041] The second voltage stabilizer includes a second connection terminal connected between the second power connection terminal 23 and the third ground terminal 34 , and the second voltage stabilizer is used to stabilize the voltage domain of the intermediate module.

[0042] Specifically, the first voltage regulator and the second voltage regulator both adopt low-voltage linear voltage regulators, and the output power tube of the low-voltage linear voltage regulator is a class-AB structure.

[0043] When the current of the intermediate module matches the current of the input module, the first regulator has no input or output current; when the current of the output module matches the current of the intermediate module, the second regulator has no input or output current.

[0044] The receiving front-end circuit also includes an isolation module 50, which is respectively arranged between the first output terminal 14 of the input module and the second input terminal 21 of the intermediate module 20, and between the second output terminal 24 of the intermediate module 20 and the third input terminal 31 of the output module, and is used to isolate the voltage domains between the input module and the intermediate module, and between the intermediate module and the output module.

[0045] Specifically, the isolation module includes a first isolation capacitor 51 and a second isolation capacitor 52; the first end of the first isolation capacitor 51 is electrically connected to the first output terminal 14, and the second end of the first isolation capacitor is electrically connected to the second input terminal 21, for isolating the input module from the intermediate module 20, so that the voltage domain of the input module 10 and the voltage domain of the intermediate module 20 are independent of each other; the first end of the second isolation capacitor 52 is electrically connected to the second output terminal 24, and the second end of the second isolation capacitor is electrically connected to the third input terminal 31, for isolating the intermediate module 20 from the output module 30, so that the voltage domain of the intermediate module and the voltage domain of the output module are independent of each other.

[0046] In addition, the resistance values ​​of the resistors in the input module 10 , the resistors in the intermediate module 20 , and the resistors in the output module 30 are different from each other.

[0047] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, wherein the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0048] Example 1

[0049] like Figure 2 , Figure 3 As shown, this embodiment provides a receiving front-end circuit. The receiving front-end circuit includes: a general input terminal 01, a general output terminal 02, an input module 10, an intermediate module 20 and an output module 30.

[0050] The input module 10 has a first input terminal 11, a first output terminal 12, a first power terminal 13 and a first ground terminal 14, the intermediate module 20 has a second input terminal 21, a second output terminal 22, a second power terminal 23 and a second ground terminal 24, and the output module 30 has a third input terminal 31, a third output terminal 32, a third power terminal 33 and a third ground terminal 34. The total input terminal 01 is electrically connected to the first input terminal 11, the first output terminal 12 is electrically connected to the second input terminal 21, the second output terminal 22 is electrically connected to the third input terminal 31, the third output terminal 32 is electrically connected to the total output terminal 02, the first ground terminal 14 is grounded, the first power terminal 13 is electrically connected to the second ground terminal 24, the second power terminal 23 is electrically connected to the third ground terminal 34, the third power terminal 33 is used to connect to a power supply, the total input terminal 01 is used to connect to the signal conversion module 100, and the total output terminal 02 is used to connect to the analog-to-digital converter 200.

[0051] In this embodiment, since the total input terminal 01 is electrically connected to the first input terminal 11, the first output terminal 12 is electrically connected to the second input terminal 21, the second output terminal 22 is electrically connected to the third input terminal 31, the third output terminal 32 is electrically connected to the total output terminal 02, the first ground terminal 14 is grounded, the first power terminal 13 is electrically connected to the second ground terminal 24, the second power terminal 23 is electrically connected to the third ground terminal 34, and the third power terminal 33 is used to connect the power supply. Therefore, after the power supply is connected to the third power terminal 33, the current first flows into the third power terminal 33, then flows out from the third ground terminal 34, then flows into the second power terminal 23, and then flows out from the second ground terminal 24 , then flows into the first power terminal 13, and then flows out from the first ground terminal 14 to the ground, thereby forming a current flow path, and the current can flow, and in the process of current flow, it is equivalent to the input module 10, the intermediate module 20 and the output module 30 multiplexing the current, so that the total current consumption in the front-end receiving circuit is only the current flowing into the third receiving module. Compared with the related art, the total current consumption in the front-end receiving circuit is the sum of the current flowing into the input module 10, the current flowing into the intermediate module 20, and the current flowing into the output module 30. The total current consumption in the front-end receiving circuit of this embodiment is reduced, thereby reducing the power consumption of the front-end receiving circuit. That is, in this embodiment, by electrically connecting the total input terminal 01 to the first input terminal 11, the first output terminal 12 to the second input terminal 21, the second output terminal 22 to the third input terminal 31, the third output terminal 32 to the total output terminal 02, the first ground terminal 14 to the ground, the first power terminal 13 to the second ground terminal 24, the second power terminal 23 to the third ground terminal 34, and the third power terminal 33 to the power supply, the total current consumption in the front-end receiving circuit can be reduced, thereby reducing the power consumption of the front-end receiving circuit.

[0052] It should be noted that, in this embodiment, Figure 2 As shown, the total input terminal 01 is electrically connected to the first input terminal 11, the first output terminal 12 is electrically connected to the second input terminal 21, the second output terminal 22 is electrically connected to the third input terminal 31, the third output terminal 32 is electrically connected to the total output terminal 02, the first ground terminal 14 is grounded, the first power terminal 13 is electrically connected to the second ground terminal 24, the second power terminal 23 is electrically connected to the third ground terminal 34, and the third power terminal 33 is used to connect the power supply. In such a connection relationship, it is equivalent to stacking the input module 10, the intermediate module 20 and the output module 30, that is, in a signal path, the electrical components are stacked. If the current flowing into the third power terminal 33 is I, I is equal to I1, then in this embodiment, the total current consumption in the front-end receiving circuit is I1, that is, the total current consumption of the front-end receiving circuit of this embodiment is one-third of the total current consumption of the front-end receiving circuit in the related art, so that the power consumption of the front-end receiving circuit of this embodiment can be reduced by several times compared with the power consumption of the front-end receiving circuit in the related art.

[0053] In addition, in this embodiment, by designing the connection relationship between the input module 10, the intermediate module 20 and the output module 30, it is equivalent to folding the input module 10, the intermediate module 20 and the output module 30 in a signal path, so that the power consumption of the front-end receiving circuit in the signal path is reduced several times. In addition, the multiple of power consumption reduction depends on the number of folding levels in the signal path, for example, Figure 2 As shown, the front-end receiving circuit in the signal path is equivalent to having three levels of folding, and the power consumption of the front-end receiving circuit is one third of the front-end receiving circuit in the related art.

[0054] In addition, in this embodiment, the resistance of the input module 10, the resistance of the intermediate module 20, and the resistance of the output module 30 are different from each other. Among them, the withstand voltage values ​​of the electronic components in the input module 10, the electronic components in the intermediate module 20, and the electronic components in the output module 30 are different from each other, so that the resistance of the input module 10, the resistance of the intermediate module 20, and the resistance of the output module 30 are different from each other, so that the input module 10, the intermediate module 20, and the output module 30 can meet the design of the front-end receiving circuit.

[0055] Example 2

[0056] In addition, in some embodiments, the receiving front-end circuit may further include a voltage stabilizing module 40. The voltage stabilizing module 40 is respectively connected between the first power terminal 13 and the second ground terminal 24, and between the second power terminal 23 and the third ground terminal 34, and is used to stabilize the voltage of the intermediate module 20 and / or the input module 10.

[0057] In some embodiments, the voltage stabilizing module 40 may include a first voltage stabilizer 41 and a second voltage stabilizer 42. The first voltage stabilizer 41 has a first connection terminal, the first connection terminal is connected between the first power terminal 13 and the second ground terminal 24, the second voltage stabilizer 42 has a second connection terminal, the second connection terminal is connected between the second power terminal 23 and the third ground terminal 34, the first voltage stabilizer 41 is used to stabilize the voltage of the input module 10, and the second voltage stabilizer 42 is used to stabilize the voltage of the intermediate module 20.

[0058] In addition, in this embodiment, the first regulator 41 and the second regulator 42 are both low-voltage linear regulators (Low Dropout Regulator, LDO) using an output power tube with a class-AB structure. The current generated by the input module 10, the current generated by the intermediate module 20, and the current generated by the output module 30 can flow into the low-voltage linear regulator and can also flow out of the low-voltage linear regulator.

[0059] Among them, when the first voltage regulator 41 is a low-voltage linear voltage regulator using an output power tube of a class-AB structure, and the first voltage regulator is connected between the input module 10 and the intermediate module 20, at this time, once the input module 10 and the intermediate module 20 cause a current difference, or the intermediate module 20 and the output module 30 cause a current difference, the difference current can flow into the low-voltage linear voltage regulator. The low-voltage linear voltage regulator can flow out of the current to adjust the current difference. For example, when the current flowing from the third power terminal 33 to the third ground terminal 34 of the input module 10 is greater than the current flowing from the second power terminal 23 to the second ground terminal 24 of the intermediate module 20, the difference current between the two can flow into the first voltage regulator 41; when the current flowing from the third power terminal 33 to the third ground terminal 34 of the input module 10 is less than the current flowing from the second power terminal 23 to the second ground terminal 24 of the intermediate module 20, the difference current between the two can flow out of the first voltage regulator 41. When the current flowing from the third power terminal 33 to the third ground terminal 34 of the input module 10 is equal to the current flowing from the second power terminal 23 to the second ground terminal 24 of the intermediate module 20, the output end of the first voltage regulator 41 does not output or input current. The specific regulation process of the second voltage regulator 42 for current using a low-voltage linear voltage regulator with a class-AB output power tube can refer to the regulation process of the first voltage regulator 41 for current using a low-voltage linear voltage regulator with a class-AB output power tube, which will not be repeated here.

[0060] In addition, in this embodiment, when the current of the intermediate module 20 matches the current of the input module 10, the first voltage regulator 41 does not output or input current; when the current of the output module 30 matches the current of the intermediate module 20, the second voltage regulator 42 does not output or input current. That is, when the current of the intermediate module 20 matches the current of the input module 10, the first connection end of the first voltage regulator 41 no longer outputs or inputs current, and when the current of the output module 30 matches the current of the intermediate module 20, the second connection end of the second voltage regulator 42 no longer outputs or inputs current.

[0061] Example 3

[0062] In addition, in some embodiments, the receiving front-end circuit may further include an isolation module 50. The isolation module 50 is respectively connected between the first output terminal 12 and the second input terminal 21, and between the second output terminal 22 and the third input terminal 31. The isolation module 50 is used to isolate the input module 10 from the intermediate module 20, so that the voltage domain where the input module 10 is located is independent of the voltage domain where the intermediate module 20 is located, and is used to isolate the intermediate module 20 from the output module 30, so that the voltage domain where the intermediate module 20 is located is independent of the voltage domain where the output module 30 is located.

[0063] The resistance of the input module 10, the resistance of the intermediate module 20 and the resistance of the output module 30 are different from each other, so that the voltage domain of the input module 10, the voltage domain of the intermediate module 20 and the voltage domain of the output module 30 are different from each other, so that the input module 10, the intermediate module 20 and the output module 30 are in different voltage domains. In this embodiment, the isolation module 50 is respectively connected between the first output terminal 12 and the second input terminal 21, and between the second output terminal 22 and the third input terminal 31, so that the isolation module 50 isolates the input module 10 and the intermediate module 20, so that the voltage domain where the input module 10 is located and the voltage domain where the intermediate module 20 is located are independent of each other, that is, the voltage domain where the input module 10 is located and the voltage domain where the intermediate module 20 is located do not affect each other. The isolation module 50 isolates the intermediate module 20 and the output module 30, so that the voltage domain where the intermediate module 20 is located and the voltage domain where the output module 30 is located are independent of each other, that is, the voltage domain where the intermediate module 20 is located and the voltage domain where the output module 30 is located do not affect each other. That is, by providing the isolation module 50 , it is possible to avoid voltages of devices in different voltage domains from influencing each other.

[0064] In addition, in some embodiments, the isolation module 50 may include a first isolation capacitor 51 and a second isolation capacitor 52. The first end of the first isolation capacitor 51 is electrically connected to the first output terminal 12, the second end of the first isolation capacitor 51 is electrically connected to the second input terminal 21, and the first isolation capacitor 51 is used to isolate the input module 10 from the intermediate module 20, so that the voltage domain where the input module 10 is located is independent of the voltage domain where the intermediate module 20 is located; the first end of the second isolation capacitor 52 is electrically connected to the second output terminal 22, the second end of the second isolation capacitor 52 is electrically connected to the third input terminal 31, and the second isolation capacitor 52 is used to isolate the intermediate module 20 from the output module 30, so that the voltage domain where the intermediate module 20 is located is independent of the voltage domain where the output module 30 is located.

[0065] When the first end of the first isolation capacitor 51 is electrically connected to the first output terminal 12, and the second end of the first isolation capacitor 51 is electrically connected to the second input terminal 21, at this time, it is equivalent to connecting the first isolation capacitor 51 in series between the input module 10 and the intermediate module 20, so that the first isolation capacitor 51 will isolate the voltage domains of the input module 10 and the intermediate module 20, so that the voltage domain of the input module 10 and the voltage domain of the intermediate module 20 are independent of each other and do not affect each other. When the first end of the second isolation capacitor 52 is electrically connected to the second output terminal 22, and the second end of the second isolation capacitor 52 is electrically connected to the third input terminal 31, at this time, it is equivalent to connecting the second isolation capacitor 52 in series between the intermediate module 20 and the output module 30, so that the second isolation capacitor 52 will isolate the voltage domains of the intermediate module 20 and the output module 30, so that the voltage domain of the intermediate module 20 and the voltage domain of the output module 30 are independent of each other and do not affect each other. That is, the first isolation capacitor 51 and the second isolation capacitor 52 are provided so that the input module 10 , the intermediate module 20 and the output module 30 can be stably in different voltage domains, and the voltages of the three do not affect each other.

[0066] It should be noted that, in this embodiment, the number of the first isolation capacitors 51 can be set according to actual needs. For example, the number of the first isolation capacitors 51 is 1, and for another example, the number of the first isolation capacitors 51 is 2. In this case, the two first isolation capacitors 51 are connected in series. The specific number of the first isolation capacitors 51 is not limited in this embodiment of the present application. In addition, the number of the second isolation capacitors 52 can also be set according to actual needs. For example, the number of the second isolation capacitors 52 is 1, and for another example, the number of the second isolation capacitors 52 is 2. In this case, the two second isolation capacitors 52 are connected in series. The specific number of the second isolation capacitors 52 is not limited in this embodiment of the present application.

[0067] In this embodiment, since the total input terminal 01 is electrically connected to the first input terminal 11, the first output terminal 12 is electrically connected to the second input terminal 21, the second output terminal 22 is electrically connected to the third input terminal 31, the third output terminal 32 is electrically connected to the total output terminal 02, the first ground terminal 14 is grounded, the first power terminal 13 is electrically connected to the second ground terminal 24, the second power terminal 23 is electrically connected to the third ground terminal 34, and the third power terminal 33 is used to connect the power supply. Therefore, after the power supply is connected to the third power terminal 33, the current first flows into the third power terminal 33, then flows out from the third ground terminal 34, then flows into the second power terminal 23, and then flows out from the second ground terminal 24 , then flows into the first power terminal 13, and then flows out from the first ground terminal 14 to the ground, thereby forming a current flow path, and the current can flow, and in the process of current flow, it is equivalent to the input module 10, the intermediate module 20 and the output module 30 multiplexing the current, so that the total current consumption in the front-end receiving circuit is only the current flowing into the third receiving module. Compared with the related art, the total current consumption in the front-end receiving circuit is the sum of the current flowing into the input module 10, the current flowing into the intermediate module 20, and the current flowing into the output module 30. The total current consumption in the front-end receiving circuit of this embodiment is reduced, thereby reducing the power consumption of the front-end receiving circuit. That is, in this embodiment, by electrically connecting the total input terminal 01 to the first input terminal 11, the first output terminal 12 to the second input terminal 21, the second output terminal 22 to the third input terminal 31, the third output terminal 32 to the total output terminal 02, the first ground terminal 14 to the ground, the first power terminal 13 to the second ground terminal 24, the second power terminal 23 to the third ground terminal 34, and the third power terminal 33 to the power supply, the total current consumption in the front-end receiving circuit can be reduced, thereby reducing the power consumption of the front-end receiving circuit.

[0068] Example 4

[0069] The present application embodiment provides an optical circuit, such as Figure 3 As shown, the optical circuit includes a signal conversion module 100, an analog-to-digital converter 200, and a receiving front-end circuit in any of the above embodiments. The signal conversion module 100 is electrically connected to the total input terminal 01, and the total output terminal 02 is electrically connected to the analog-to-digital converter 200.

[0070] In this embodiment, since the total input terminal 01 is electrically connected to the first input terminal 11, the first output terminal 12 is electrically connected to the second input terminal 21, the second output terminal 22 is electrically connected to the third input terminal 31, the third output terminal 32 is electrically connected to the total output terminal 02, the first ground terminal 14 is grounded, the first power terminal 13 is electrically connected to the second ground terminal 24, the second power terminal 23 is electrically connected to the third ground terminal 34, and the third power terminal 33 is used to connect the power supply. Therefore, after the power supply is connected to the third power terminal 33, the current first flows into the third power terminal 33, then flows out from the third ground terminal 34, then flows into the second power terminal 23, and then flows out from the second ground terminal 24 , then flows into the first power terminal 13, and then flows out from the first ground terminal 14 to the ground, thereby forming a current flow path, and the current can flow, and in the process of current flow, it is equivalent to the input module 10, the intermediate module 20 and the output module 30 multiplexing the current, so that the total current consumption in the front-end receiving circuit is only the current flowing into the third receiving module. Compared with the related art, the total current consumption in the front-end receiving circuit is the sum of the current flowing into the input module 10, the current flowing into the intermediate module 20, and the current flowing into the output module 30. The total current consumption in the front-end receiving circuit of this embodiment is reduced, thereby reducing the power consumption of the front-end receiving circuit. That is, in this embodiment, by electrically connecting the total input terminal 01 to the first input terminal 11, the first output terminal 12 to the second input terminal 21, the second output terminal 22 to the third input terminal 31, the third output terminal 32 to the total output terminal 02, the first ground terminal 14 to the ground, the first power terminal 13 to the second ground terminal 24, the second power terminal 23 to the third ground terminal 34, and the third power terminal 33 to the power supply, the total current consumption in the front-end receiving circuit can be reduced, thereby reducing the power consumption of the front-end receiving circuit, thereby reducing the power consumption of the optical circuit.

[0071] It should be noted that, in this embodiment, the signal conversion module 100 may be an optical signal conversion module. Of course, the signal conversion module 100 may also be of other types, for example, the signal conversion module 100 is an acoustic signal conversion module. The specific type of the signal conversion module 100 is not limited in this embodiment of the application.

[0072] Example 5

[0073] The embodiment of the present application provides a chip, which includes a body and a receiving front-end circuit in any of the above embodiments. The receiving front-end circuit is located in the body.

[0074] In this embodiment, since the total input terminal 01 is electrically connected to the first input terminal 11, the first output terminal 12 is electrically connected to the second input terminal 21, the second output terminal 22 is electrically connected to the third input terminal 31, the third output terminal 32 is electrically connected to the total output terminal 02, the first ground terminal 14 is grounded, the first power terminal 13 is electrically connected to the second ground terminal 24, the second power terminal 23 is electrically connected to the third ground terminal 34, and the third power terminal 33 is used to connect the power supply. Therefore, after the power supply is connected to the third power terminal 33, the current first flows into the third power terminal 33, then flows out from the third ground terminal 34, then flows into the second power terminal 23, and then flows out from the second ground terminal 24 , then flows into the first power terminal 13, and then flows out from the first ground terminal 14 to the ground, thereby forming a current flow path, and the current can flow, and in the process of current flow, it is equivalent to the input module 10, the intermediate module 20 and the output module 30 multiplexing the current, so that the total current consumption in the front-end receiving circuit is only the current flowing into the third receiving module. Compared with the related art, the total current consumption in the front-end receiving circuit is the sum of the current flowing into the input module 10, the current flowing into the intermediate module 20, and the current flowing into the output module 30. The total current consumption in the front-end receiving circuit of this embodiment is reduced, thereby reducing the power consumption of the front-end receiving circuit. That is, in this embodiment, by electrically connecting the total input terminal 01 to the first input terminal 11, the first output terminal 12 to the second input terminal 21, the second output terminal 22 to the third input terminal 31, the third output terminal 32 to the total output terminal 02, the first ground terminal 14 to the ground, the first power terminal 13 to the second ground terminal 24, the second power terminal 23 to the third ground terminal 34, and the third power terminal 33 to the power supply, the total current consumption in the front-end receiving circuit can be reduced, thereby reducing the power consumption of the front-end receiving circuit, thereby reducing the power consumption of the chip.

[0075] In summary, this embodiment discloses a low-power stacked laser radar receiving front-end circuit, optical circuit and chip, which realizes a low-power receiving front-end circuit chip with fully integrated power supply by using the method of folding within the channel to achieve current recycling and higher power efficiency, and provides an innovative solution for the low-power design of laser radar, which has important significance and application value.

[0076] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0077] Although the optional embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the present application.

[0078] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. At the same time, for those skilled in the art, according to the principles and implementation methods of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A laser radar receiving front-end circuit, characterized in that: It includes a total input terminal, a total output terminal, an input module, an intermediate module and an output module, wherein the input module includes a first input terminal, a first output terminal, a first power terminal and a first ground terminal; the intermediate module includes a second input terminal, a second output terminal, a second power terminal and a second ground terminal; the output module includes a third input terminal, a third output terminal, a third power terminal and a third ground terminal; The first input terminal is electrically connected to the total input terminal, the first output terminal is electrically connected to the second input terminal, the first power terminal is electrically connected to the second ground terminal, and the first ground terminal is grounded; the second output terminal is electrically connected to the third input terminal, and the second power terminal is electrically connected to the third ground terminal; the third output terminal is electrically connected to the total output terminal, and the third power terminal is used to connect to a power supply.

2. The laser radar receiving front-end circuit according to claim 1, characterized in that: The receiving front-end circuit also includes a voltage stabilizing module, which is respectively arranged between the input module and the intermediate module and between the intermediate module and the output module, and is used to stabilize the voltage of the intermediate module and / or the input module.

3. The laser radar receiving front-end circuit according to claim 2, characterized in that: The voltage stabilizing module includes a first voltage stabilizer and a second voltage stabilizer; The first voltage stabilizer comprises a first connection terminal, the first voltage stabilizer is connected between the first power connection terminal and the second ground terminal according to the first connection terminal, and is used to stabilize the voltage domain of the input module; The second voltage stabilizer comprises a second connection terminal connected between the second power connection terminal and the third ground terminal, and the second voltage stabilizer is used to stabilize the voltage domain of the intermediate module.

4. The laser radar receiving front-end circuit according to claim 3, characterized in that: The first voltage regulator and the second voltage regulator both adopt low-voltage linear voltage regulators, and the output power tube of the low-voltage linear voltage regulator is a class-AB structure.

5. The laser radar receiving front-end circuit according to claim 3, characterized in that: When the current of the intermediate module matches the current of the input module, the first regulator has no input or output current; When the current of the output module matches the current of the intermediate module, the second regulator has no input or output current.

6. The laser radar receiving front-end circuit according to claim 1, characterized in that: The receiving front-end circuit also includes an isolation module, which is respectively arranged between the first output end of the input module and the second input end of the intermediate module, and between the second output end of the intermediate module and the third input end of the output module, and is used to isolate the voltage domains between the input module and the intermediate module, and between the intermediate module and the output module.

7. The laser radar receiving front-end circuit according to claim 6, characterized in that: The isolation module includes a first isolation capacitor and a second isolation capacitor; The first end of the first isolation capacitor is electrically connected to the first output end, and the second end of the first isolation capacitor is electrically connected to the second input end, for isolating the input module from the intermediate module, so that the voltage domain of the input module and the voltage domain of the intermediate module are independent of each other; The first end of the second isolation capacitor is electrically connected to the second output end, and the second end of the second isolation capacitor is electrically connected to the third input end, and is used to isolate the intermediate module from the output module, so that the voltage domain of the intermediate module and the voltage domain of the output module are independent of each other.

8. The laser radar receiving front-end circuit according to any one of claims 1 to 7, characterized in that: The resistance values ​​of the resistors in the input module, the resistors in the intermediate module and the resistors in the output module are different from each other.

9. An optical circuit, characterized in that: The optical circuit includes a signal conversion module, an analog-to-digital converter, and a laser radar receiving front-end circuit according to any one of claims 1 to 8; The signal conversion module is electrically connected to the total input end of the laser radar receiving front-end circuit, and the total output end of the laser radar receiving front-end circuit is electrically connected to the analog-to-digital converter.

10. A chip, characterized in that: The chip body comprises a laser radar receiving front-end circuit as described in any one of claims 1 to 8.

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