57results about How to "Make sure to be in" patented technology

The embodiment of the invention relates to the technical field of network security, and discloses an identity information verification method, a server and a storage medium. The method comprises the steps of receiving an auditing request sent by a target terminal, the auditing request is transmitted through a trusted channel, the auditing request comprises a digital signature indicating user identity information, and the digital signature is generated by encrypting a preset target private key; authenticating the auditing request according to a pre-stored target public key; and after the authentication is passed, an auditing result corresponding to the auditing request is sent to a target terminal, so that the target terminal sends the auditing result to an application server needing identity authentication to complete identity authentication, and the auditing result does not include user identity information. In the auditing process, the auditing request is transmitted through the credible channel, it is ensured that the identity information is located in the safe environment, the auditing request comprises the encrypted digital signature, the credibility of identity information verification is ensured, and the privacy and safety of the identity verification process are improved.

The invention discloses a mining liquid carbon dioxide delivery device, which comprises a pipeline device, the pipeline device includes an outer tube and an inner tube, one end of the outer tube is connected with a first gaseous carbon dioxide storage tank, and one end of the inner tube is connected with a second gaseous carbon dioxide storage tank and The liquid carbon dioxide storage tank is connected, one end of the inner pipe is provided with a pressure stabilizing valve, and the other end of the inner pipe is provided with a pressure control valve, and the conveying device also includes a monitoring system. The delivery device can improve the reliability of delivery of liquid carbon dioxide and avoid safety accidents. The invention also discloses a leakage monitoring method of a mine-used liquid carbon dioxide delivery device. The monitoring method uses two pressure transmitters to monitor the pressure change inside the outer pipe. When the inner pipe leaks, both pressure transmitters will monitor When the abnormal signal of pressure increase is detected, the controller obtains the above abnormal signal, and calculates the specific location of the leakage point according to the time of obtaining the above abnormal signal. This monitoring method is simple, convenient and effective.

The invention discloses a current multiplying self-biasing current multiplexing passive frequency mixer which comprises a self-biasing input transconductance stage, a passive local oscillator switch and a low voltage transimpedance amplifier. The self-biasing input transconductance stage is provided with a self-biasing transconductance stage combined with a capacitive coupling current mirror. On one hand, transconductance current and the transimpedance amplifier are multiplexed. On the other hand, the bias current of the transimpedance amplifier can be precisely fixed. An additional differential pair is introduced in the low voltage transimpedance amplifier. The source of a common-gate tube is equivalent to virtual ground under a transconductance enhancement circuit. A transconductance tube in the differential pair replicates the current of the common-gate tube, and the current is injected into a load. Down-converted current is multiplied. Compared with a conventional passive frequency mixer, the current multiplying self-biasing current multiplexing passive frequency mixer provided by the invention has the advantages that the power supply voltage and bias current are reduced simultaneously; higher efficiency is realized; the conversion gain is improved; and the noise performance is improved.

The invention relates to a system for fastening a rail on a subsurface (U) and to a guide plate (7, 8) intended for such a system (1). The system comprises a spring element (9, 10) which can be braced against the subsurface (U) by means of a tensioning element (15, 16) and has at least one spring arm (48, 49), an adapter piece (11-14) which sits on an end section of the spring arm (48, 49) and has a contact surface section (58-60), and a guide plate (7, 8). The guide plate has a contact surface (42) for the rail foot (F) and a slide surface (56, 57) which adjoins the contact surface (42) and via which the adapter piece (11-14) can be moved out of a pre-assembly position, in which the contact surface section (58-60) of the adapter piece sits on the guide plate (7, 8), into an installation position, in which the contact surface section (58-60) of the adapter piece sits on the rail foot (F) of the rail (S) to be fastened. The slide surface (56, 57) of the guide plate (7, 8) ascends in the direction of the contact surface (42). In addition, a stop (54, 55) is provided on the slide surface (56, 57) and the adapter piece (11-14) is seated against said stop in the pre-assembly position.

The invention discloses a thick-wall pipe lateral induction straight seam welding device. The thick-wall pipe lateral induction straight seam welding device comprises a pressing roller, a numerical control operation table, a supporting frame, an end cover, a hydraulic cylinder, a local induction heating device, an infrared temperature detector, a disc-shaped induction coil, a rack, a hydraulic jacking device, a hydraulic telescopic arm, a supporting shaft, an edge heating module and a coupling block. The thick-wall pipe lateral induction straight seam welding method is provided and comprises the following steps: preheating the upper side and the lower side of a thick-wall pipe welding gap through the induction coil connected with a magnetizer, controlling the axial extension and retraction of the hydraulic cylinder to control the position of a local induction coil, and supplementing heat for a low-temperature part of the side wall of a welding seam. By means of transverse magnetic flux heating, the heating range and efficiency are effectively controlled, the coil provided with the magnetizer is used for conducting heat compensation on the low-temperature part, the situation that the temperature of a welding face is not uniform due to the boundary effect is avoided, and the welding defects such as cold welding, slotting and edge waves can be greatly reduced.

The invention relates to a sniping trajectory acoustically measuring method. The method comprises the following steps: (1) randomly distributing and fixing three tetrahedral quaternary arrays to form a microphone array, wherein the three tetrahedral quaternary arrays are not on the same straight line; (2) measuring and calibrating space coordinates of all sensors in the three tetrahedral quaternary arrays by using a total station; (3) respectively determining equations of directional lines l1, l2 and l3 of respective shockwave acoustic source points of the three microphones, and setting the direction from the shockwave acoustic source points to the corresponding microphone matrixes to be the forward directions of directional lines l1, l2 and l3; (4) establishing a geometric model of a trajectory line L and a searching rule; and (5) removing one unreasonable trajectory line and determining a unique trajectory line L. By the method, the technical problem of large error in the conventional acoustically detecting method is solved, and the track and direction of the sniping trajectory can be quickly and accurately calculated, thereby providing a low-cost and practical technical method for safety guard work in critical areas. Therefore, the method has important realistic magnificence in counterterrorism and peacekeeping.

The invention provides an electropolishing device for inner wall of stainless steel pipe, the upper end of the device is provided with a copper anode unit frame, the copper anode unit frame has an inclination angle of 5 to 15 degrees, and extension steel pipes are connected to both ends of a steel pipe, the left end of the extension steel pipe at the left end is provided with an electrolyte distributor, the electrolyte distributor is connected with a high-lift centrifugal pump through a pipeline, the right end opening of the extension steel pipe at the right end is connected with a collector,a flexible cathode is arranged in the steel pipe, a return pipe connected with an electrolyte tank is arranged at the bottom of the collector, a pressure relief pipeline is arranged between the upperend of the electrolyte tank and the outlet of the high-lift centrifugal pump, and a fully automatic control host and a high frequency pulse rectifier are arranged at the bottom of the right side of the copper anode unit frame. The device has compact structure, small floor space, high processing efficiency, good processing quality, convenient assembly and disassembly of components, long service life of the device and good economic benefits.

The invention discloses a low-voltage self-biased current multiplexing passive mixer, comprising a self-biased complementary input transconductance stage, a passive local oscillator switch and a low-voltage trans-impedance amplifier, wherein the self-biased complementary input transconductance stage is a CMOS structure, and is used for injecting radio frequency current to the passive local oscillator switch through an NMOS transistor and a PMOS transistor jointly; the low-voltage trans-impedance amplifier is a common-gate amplifier which adopts a transconductance bootstrap circuit, and the transconductance bootstrap circuit adopts a common-source amplifier structure input by the NMOS transistor; and the self-biased complementary input transconductance stage forms current with the low-voltage trans-impedance amplifier for multiplexing through the passive local oscillator switch. According to the low-voltage self-biased current multiplexing passive mixer disclosed by the invention, the power supply voltage and bias current can be simultaneously reduced, relatively high conversion gain can be achieved, the power consumption level of the mixer can be obviously reduced, and characteristics of high conversion gain, stable operation and low overall power consumption can be achieved.

The invention discloses a presplitting blasting system used for foundation pit excavation. The system comprises a row of blast holes formed in blasting rock, charging devices are arranged in the blastholes, electronic detonators in the charging devices are connected with an outer exploder through wires, before the main blasting area where the blasting center is located is blasted, the exploder detonates the electronic detonators in a time-difference-free manner, the charging devices are detonated, the rock is pulled cut on the excavation face, and the in-order contour line penetrating the gapis formed; each charging device comprises a sealed cylinder, a supporting rod, a bottom base layer, the corresponding electronic detonator and multiple explosives in series connection through a detonating cord, wherein the supporting rod, the bottom base layer, the corresponding electronic detonator and the multiple explosives are arranged in the cylinder, hole plugs are arranged on the top endsof the cylinders, and the cylinders are filled with water media. The system solves the problems that in traditional presplitting blasting, the mounting random of explosives is large, and the blastingprecision is not high, and the integrality of the presplitting blasting contour line is ensured.

The invention discloses a pre-crack blasting hole charging device for foundation pit excavation, which includes a sealed cylinder as well as a supporting rod, a bottom bedding, an electronic detonatorand a plurality of explosive packages connected in series by a detonating cord which are arranged in the sealed cylinder. The bottom bedding is arranged at the bottom of the cylinder. The supportingrod is embedded in the inner part of the bottom bedding and is fixed at the central position of the cylinder. The explosive packages are fixed on the supporting rod. The electronic detonator is fixedwith one of the explosive packages and is connected with an external initiator through a firing line; the top end of the cylinder is provided with a hole plug. The cylinder is filled with water medium; the device overcomes the problems of large installation randomness and low blasting precision of the pre-crack explosive in the prior art, and ensures the completeness of the pre-crack blasting contour line.

The invention provides an endoscope, comprising an endoscope casing, an optical assembly and a drying part; the endoscope casing has a cavity for accommodating the optical assembly, and the drying component is installed in the cavity On the part, the mounting part is arranged on the outer wall of the optical assembly, the inner wall of the cavity of the endoscope housing, or the bracket between the optical assembly and the endoscope housing. In the endoscope provided by the present invention, after the drying component is installed on the mounting part, it is ensured that the drying component is located on the optical path of the endoscope, which effectively avoids the generation of a fog layer on the optical path of the endoscope, and improves the performance of the endoscope. The dryness in the cavity effectively ensures the imaging performance of the endoscope.

The invention provides a waste wire recycling device, and belongs to the technical field of machinery. The technical problem that the existing skin and wire core separation efficiency is low is solved. The waste wire recycling device comprises a rack, wherein an input assembly for inputting a wire is arranged on the rack; a plurality of auxiliary transmission assemblies for assisting in wire inputare arranged on the rack; each auxiliary transmission assembly comprises a transmission roller I and a transmission roller II; the transmission rollers I and the transmission rollers II are arrangedon the rack; a conveying channel for conveying the wire is formed between the transmission rollers I and the transmission rollers II; the transmission rollers I and the transmission rollers II can straighten the wire; an extrusion wheel I, an extrusion wheel II, an extrusion wheel III and an extrusion wheel IV are rotationally arranged on the rack; the extrusion wheel I and the extrusion wheel IIare transversely arranged; and the extrusion wheel III and the extrusion wheel IV are longitudinally arranged. The waste wire recycling device has the advantage of high skin and wire core separation efficiency.

The invention discloses a laser early cancer diagnosis instrument. An optical path between a laser (1) and an optical fiber coupler (6) of the diagnosis instrument is arranged thereon with a frequency doubler (2), a frequency mixer (3), a frequency divider (4) and a filter (5) in sequence. An optical path of the frequency divider (4) is arranged thereon with a photoelectric converter (11) for providing collected triggering signals. A conduction optical fiber (7) consists of an incident optical fiber (71) and a receiving optical fiber (72). A bandpass filter (9) for receiving fluorescence signals and a photoelectric detector (10) are arranged between the receiving optical fiber (72) and a computer (12). The computer (12) is electrically connected with the laser (1), the photoelectric converter (11), the photoelectric detector (10) and an output unit (13), and is used for controlling the laser (1), subjecting the collected fluorescence signals to integral processing by using a time domain method and sending a comparison result of the processed fluorescence signals and a fluorescence signal of a normal tissue to the output unit (12) to be displayed. The diagnosis instrument can effectively diagnose various early cancers.

The invention relates to the technical field of lighting lamp production and manufacturing, in particular to LED lighting lamp production and manufacturing assembling equipment which comprises an assembling base plate, an assembling column and an assembling top plate, the assembling column is vertically arranged, the assembling top plate and the assembling base plate are fixed to the upper end and the lower end of the assembling column correspondingly, and a lampshade clamping device is arranged on the assembling top plate; the assembling column is sequentially provided with an auxiliary positioning device and a lamp holder clamping device from top to bottom. Lampshade bodies and lamp holder bodies of different specifications and shapes can be in threaded connection, a lamp holder threaded opening and a lampshade threaded opening can be kept in a horizontal state through the positioning platform, and the situation that the lamp holder threaded opening or the lampshade threaded opening inclines, and consequently threaded connection between the lamp holder threaded opening and the lampshade threaded opening is affected is avoided; meanwhile, the positioning platform can also ensure that the lamp holder threaded opening and the lampshade threaded opening are located on the same axis so as to be in smooth butt joint.

The invention discloses a method for detecting contents of calcium and magnesium in natural limestone. The method for detecting contents of calcium and magnesium in natural limestone comprises the following steps: weighing 2g of a sample and placing the sample in a beaker, adding water for wetting, adding a hydrochloric acid solution for boiling, boiling for 15 minutes, carrying out a cooling to room temperature, adding a 1+1 ammonia-water solution for adjusting till floc generates, mixing the solution, filtering with filter paper, fetching 25.00ml of the filtered sample solution, adding 50mL of water, adding 5.0mL of triethanolamine solution, adding a drop of malachite green solution (1%), adding a sodium hydroxide solution (100g / L) for adjusting till the blue green color in the solution disappears, carrying out a heating for boiling, after boiling, carrying out a continuous heating with soft fire for about 5 minutes, after cooling, adding a few of calcium indicators, and carrying out a titration with an EDTA standard solution till the solution color changes into blue which is the terminal point from red; according to the invention, a malachite green solution is used for accurately controlling the pH value of magnesium deposition condition and the pH value of titration system terminal point, and the method provided by the invention is convenient, rapid and accurate; the step of heating, boiling and micro-boiling for 5 minutes is used for ensuring complete deposition of magnesium; the detection method is simple, rapid, and has stable determination results and good recovery rates.

The invention provides an electropolishing device for inner wall of stainless steel pipe, the upper end of the device is provided with a copper anode unit frame, the copper anode unit frame has an inclination angle of 5 to 15 degrees, and extension steel pipes are connected to both ends of a steel pipe, the left end of the extension steel pipe at the left end is provided with an electrolyte distributor, the electrolyte distributor is connected with a high-lift centrifugal pump through a pipeline, the right end opening of the extension steel pipe at the right end is connected with a collector,a flexible cathode is arranged in the steel pipe, a return pipe connected with an electrolyte tank is arranged at the bottom of the collector, a pressure relief pipeline is arranged between the upperend of the electrolyte tank and the outlet of the high-lift centrifugal pump, and a fully automatic control host and a high frequency pulse rectifier are arranged at the bottom of the right side of the copper anode unit frame. The device has compact structure, small floor space, high processing efficiency, good processing quality, convenient assembly and disassembly of components, long service life of the device and good economic benefits.

Example embodiments presented herein are directed to a seat assembly and corresponding method and computer readable medium for adjusting a seat in an autonomous vehicle. This adjustment is provided so that the seat occupant can provide natural thrust to control the adjustment once the vehicle is in an autonomous driving mode.

The invention provides a waste wire recycling device, and belongs to the technical field of machinery. The technical problem that the existing skin and wire core separation efficiency is low is solved. The waste wire recycling device comprises a rack, wherein an input assembly for inputting a wire is arranged on the rack; a plurality of auxiliary transmission assemblies for assisting in wire inputare arranged on the rack; each auxiliary transmission assembly comprises a transmission roller I and a transmission roller II; the transmission rollers I and the transmission rollers II are arrangedon the rack; a conveying channel for conveying the wire is formed between the transmission rollers I and the transmission rollers II; the transmission rollers I and the transmission rollers II can straighten the wire; an extrusion wheel I, an extrusion wheel II, an extrusion wheel III and an extrusion wheel IV are rotationally arranged on the rack; the extrusion wheel I and the extrusion wheel IIare transversely arranged; and the extrusion wheel III and the extrusion wheel IV are longitudinally arranged. The waste wire recycling device has the advantage of high skin and wire core separation efficiency.

The invention discloses a prefabricated shear wall perpendicularity adjusting device. The prefabricated shear wall perpendicularity adjusting device comprises a Y-shaped connecting piece, a first supporting rod piece, a second supporting rod piece, a third supporting rod piece, a drop hammer and a pipe spirit level, wherein the Y-shaped connecting piece comprises a first connector, a second connector and a third connector; one end of the first supporting rod piece is connected with the first connector through a first right-hand and left-hand thread, and the other end of the first supporting rod piece is fixedly connected with a shear wall; one end of the second supporting rod piece is connected with the second connector through a second right-hand and left-hand thread, and the other end ofthe second supporting rod piece is fixedly connected with the shear wall; one end of the third supporting rod piece is connected with the third connector through a third right-hand and left-hand thread, and the other end of the third supporting rod piece is fixedly connected with an inclined strut embedded part; the drop hammer is hung on the first supporting rod piece, and the second supportingrod piece is provided with a drop hammer groove used for being matched with the drop hammer; and the pipe spirit level is arranged on the second supporting rod piece. During use, the first right-handand left-hand thread, the second right-hand and left-hand thread and the third right-hand and left-hand thread are adjusted, so that bubbles of the pipe spirit level are centered, the drop hammer falls into the drop hammer groove, so that the shear wall connected with the first supporting rod piece and the second supporting rod piece is in a vertical state, the structure is simple, and adjustmentis convenient.

The invention discloses a hole bottom fixing device of a deformed measuring rod in a rock borehole, and belongs to the technical field of geotechnical engineering. The fixing device is composed of a connecting rod, a grout containing cavity body, a first grout stopping plug, elastic ratchets, a second grout stopping plug and a piston pushing rod; the connecting rod is fixedly connected to the upper end surface of the grout containing cavity body, the first grout stopping plug and the second grout stopping plug are embedded into the upper portion and the lower portion of the annular outer wallsurface of the grout containing cavity body respectively, three rows of grout discharging through holes are formed in the grout containing cavity body, ratchet bases are fixedly connected to the outerside of the grout containing cavity body, the elastic ratchets are fixed to the ratchet bases through fixing threaded rods, clamping threaded rods are arranged at the lower end of the grout containing cavity body, and the distance between the outermost ends of the two elastic ratchets symmetrically distributed is larger than the outer diameter of the second grout stopping plug. The hole bottom fixing device has the advantages that installation is fast, grouting is automatically conducted, the deformed measuring rod is reliably fixed to the central position of the borehole, vibration resistance of long-term anchorage is high and corrosion resistance is good, and the device is applicable to fixation of the deformed measuring rod for an underground construction rock.

The invention provides an endoscope, which comprises an endoscope shell, an optical component and a drying component. The endoscope shell is provided with a cavity for accommodating the optical component, the drying component is arranged on aninstalling part in the cavity body.The installing part is arranged on the outer wall of the optical component, the inner wall of the cavity of the endoscopeshell or a bracket between the optical component and the endoscope shell. According to the endoscope, after the drying part is arranged on the installing part, the drying part is ensured to be arranged on the optical path of the endoscope, afog layer is effectively prevented from being generated on the optical path of the endoscope, the dryness of the endoscope cavity body is improved, thereby effectively ensuring the imaging performance of the endoscope.

The invention discloses a microwave water vapor rapid distillation device. The microwave water vapor rapid distillation device comprises a protective cover, an opening is formed in the top of the protective cover, an exhaust assembly is installed at the opening in the top of the protective cover, and a microwave water vapor generation assembly, a distillation reaction assembly, a condensation recovery assembly and a control assembly are arranged in the protective cover, wherein the control assembly is electrically connected with the exhaust assembly, the microwave water vapor generation assembly, the distillation reaction assembly and the condensation recovery assembly, the microwave water vapor generation assembly is connected with the distillation reaction assembly through a water vaporconveying pipe, and the distillation reaction assembly is connected with the condensation recovery assembly through a connecting pipe. The microwave water vapor rapid distillation device is reasonablein design, simple in structure, easy to operate, high in automation degree, high in microwave heating speed, energy-saving, efficient, safe, rapid, economical, practical and wide in application range, can be used for extracting components of large-batch samples to be detected, and has a good application prospect.

The invention relates to a kinematic viscosity measuring device, which comprises a double-bulb capillary viscometer, a sealed constant-temperature box, a fixing jacket, a positioning platform, an automatic timing system and a suction cleaning system, wherein the sealed constant-temperature box is rotationally assembled on the positioning platform, and the double-bulb capillary viscometer is fixedin the sealed constant-temperature box by means of the fixing jacket; openings in the upper ends of a main pipe and a branch pipe of the double-bulb capillary viscometer are communicated with the suction cleaning system by means of pipelines respectively, liquid level sensors are arranged on the upper and lower sides of an upper bulb and a lower bulb of the double-bulb capillary viscometer respectively, and the liquid level sensors are in data transmission connection with the automatic timing system respectively. Therefore, the problem that a kinematic viscosity measuring device in the prior art cannot realize automatic measurement in a wide viscosity range. The invention further provides a using method of the kinematic viscosity measuring device, and the using method is used for preciselymeasuring the viscosity-temperature properties of non-transparent liquids or liquids of various colors.

The invention belongs to the technical field of calibration regulation and control, and relates to a method and a system forcalibrating and adjusting a heliostat. The system comprises: an active heliostat angle regulata ion module which actively regulates the angle of the heliostat according to the sunlight irradiation angle; and a heliostat angle correcting and adjusting module used for judging the change value of the illumination intensity received by each heliostat, and if the change value of the illumination intensity received by each heliostat exceeds a preset threshold value, determining that the heliostat with the change value of the illumination intensity exceeding the preset threshold value is the heliostat reflecting solar rays out of the heat collector, and adjusting the heliosta to make solar rays reflected by the heliostat return to the surface of the heat collector. The reflection angle of the heliostat can be monitored.

The invention discloses a spiral automated welding rolling machine for tanks. The spiral automated welding rolling machine for the tanks comprises a steel plate decoiling device, a steel plate leveling device, a steel plate edge cutting device, a groove machining device, a conveying device and a cylinder rolling device which are sequentially arranged and mounted, and a welding mechanical arm is arranged on one side of the cylinder rolling device. When in use, firstly the steel plate decoiling device decoils a roller-shaped steel plate, the steel plate leveling device levels the steel plate, the steel plate edge cutting device cuts the steel plate, the groove machining device machines the steel plate, the conveying device conveys the steel plate into the cylinder rolling device, and finally, the cylinder rolling device and the welding mechanical arm finish welding and cutting of internal and external gaps of a tank body. The spiral automated welding rolling machine for the tanks implement integration of six steps of decoiling, leveling, edge cutting, rolling, welding and cutting in a tank body manufacturing process, so that the production efficiency is improved, the production area and labors in the production process are reduced, and an oil tank manufacturing process is changed from multiple-operation and multiple-labor coordinative production into automated production.

The invention discloses an electronic equipment positioning method, a POS machine positioning method, a POS machine system and a piece of positioning equipment. A piece of electronic equipment generates a random code which is transmitted to the positioning equipment through wired transmission and wireless transmission respectively. The positioning equipment is provided with a decision device. If the random code acquired through wired transmission is the same with the random code acquired through wireless transmission, the electronic equipment is successfully identified, and that the electronic equipment and the positioning equipment are in the same position is ensured. The positioning equipment is further provided with a positioning device, positioning data is acquired through the positioning device, and the positioning data is transmitted to the electronic equipment and compared with initial data of the electronic equipment. If the comparison result is within a preset threshold range, the electronic equipment passes verification, that the electronic equipment is in a legal use position is determined, and subsequent transaction is allowed. Therefore, the electronic equipment is prevented from being moved to an illegal position for use, and the use safety of the electronic equipment is improved.

The invention discloses supporting ring automatic assembling equipment. The equipment comprises an equipment platform, an opening mechanism is arranged in the middle of the upper end face of the equipment platform, and an upper positioning mechanism is correspondingly arranged at the upper end of the opening mechanism. The equipment has the beneficial effects that a leather bag is blown to the required diameter of a supporting ring through cooperation of air blowing of vent holes, a rotating shaft, gears and a rack, the supporting ring falls to the positioning position after the diameter requirement is met, a pressing mechanism descends to press and position a positioning ring, it is ensured that the supporting ring is located at the required position, and the problems that that the supporting ring is not installed in place, and positioning is not accurate are avoided.

The invention discloses a current multiplying self-biasing current multiplexing passive frequency mixer which comprises a self-biasing input transconductance stage, a passive local oscillator switch and a low voltage transimpedance amplifier. The self-biasing input transconductance stage is provided with a self-biasing transconductance stage combined with a capacitive coupling current mirror. On one hand, transconductance current and the transimpedance amplifier are multiplexed. On the other hand, the bias current of the transimpedance amplifier can be precisely fixed. An additional differential pair is introduced in the low voltage transimpedance amplifier. The source of a common-gate tube is equivalent to virtual ground under a transconductance enhancement circuit. A transconductance tube in the differential pair replicates the current of the common-gate tube, and the current is injected into a load. Down-converted current is multiplied. Compared with a conventional passive frequency mixer, the current multiplying self-biasing current multiplexing passive frequency mixer provided by the invention has the advantages that the power supply voltage and bias current are reduced simultaneously; higher efficiency is realized; the conversion gain is improved; and the noise performance is improved.