717 results about "Analogue switch" patented technology

A bionic mechanical finger, comprising a bionic finger sleeve (100), a tactile sensing unit (200), a capacitance-to-digital converter (CDC) circuit, a digital processing circuit, and an analog switch array. By means of the design of a sensor structure and an inner insulating layer and the combination with a CDC, the tactile sensitivity comparable to or even superior to that of a human hand is obtained; the design that an upper electrode (210) is grounded and self-capacitors are used as lower electrodes (221) can ensure the precision of pressure measurement, thereby lowering the dependence on chip resources; and in combination with a restriction rule of capacitor design, the mechanical finger achieves a good response in daily grabbing scenarios. Also provided is a mechanical hand comprising the bionic mechanical finger.

The invention discloses a circuit for simultaneously switching transimpedances of multiple channels by adopting a shift register. The circuit is characterized in that an FPGA (Field Programmable Gate Array) is connected with a signal acquisition and conversion circuit module through an analog-to-digital converter and a clock generation and distribution module; the signal acquisition and conversion circuit module comprises a bias voltage setting module, a pi-type filter, a photoelectric sensor and a transimpedance amplification module which are connected in series; the input end of a transimpedance amplifier in the transimpedance amplification module is connected with a transimpedance gain access circuit, the transimpedance gain access circuit is connected with the output end of the transimpedance amplifier through an analog switch, and the control end of the analog switch is connected with the FPGA through a shifting register. According to the circuit and the method for simultaneously switching the transimpedances of the multiple channels by adopting the shift register, the transimpedance gain of the transimpedance amplifier is judged and switched according to the size of the signal, the range of the input signal is expanded, the resolution is improved, and the IO resources of the FPGA are saved and the cost is reduced by utilizing the storage function and the serial-parallel conversion function of the shift register.

The invention relates to the technical field of ink-jet printing, and discloses a nozzle driving method, system and device and a storage medium, and the method comprises the steps: generating a digital waveform signal based on a printing demand, and converting the digital waveform signal into an analog voltage waveform through a digital-to-analog conversion module; performing waveform configuration on the analog voltage waveform through an analog switch matrix to generate a target analog waveform; controlling a high-voltage amplification circuit to boost and amplify the target analog waveform to output an initial driving level; driving a nozzle to jet ink droplets based on the initial driving level, and collecting ink droplet state parameters by using an ink droplet monitoring module; comparing the ink droplet state parameters with a preset target value to obtain a comparison result, and generating an adjustment parameter set according to the comparison result; optimizing the initial driving level generation process based on the adjustment parameter set to obtain an optimized driving level; according to the invention, through a closed-loop control process, the problem of poor driving signal adaptability caused by existing open-loop control is effectively solved.

The invention relates to a flexible multi-channel multi-mode sensor data acquisition system. The system comprises a signal collector for collecting multi-channel signals, a pin header interface for providing multi-channel signal access, a plurality of analog switches for realizing switching and collection of the multi-channel signals and improving the flexibility and expandability of signal collection, a sensor part meeting multi-dimensional data collection requirements, and an analog-to-digital conversion chip, the control unit adopts an FPGA (Field Programmable Gate Array) to control switching of an analog switch and time sequence management, and the wireless transmission module is provided with a Wi-Fi chip; one end of the pin header interface is connected with the signal collector and the other end is connected with the analog switch; the sensor part is connected to the analog-to-digital conversion chip; the analog switch, the analog-to-digital conversion chip and the wireless transmission module are all connected to the controller. The system is a modularized multi-sensor data acquisition system with high precision and high bandwidth, and can realize dynamic sampling, efficient processing and wireless transmission of multi-sensor signals in a limited size.

The invention relates to the technical field of communication, in particular to a USB-A interface and serial port dynamic switching and protection system based on an analog switch. Comprising a main control unit, the main control unit is used for planning dynamic switching and conflict coordination of a USB-A interface and a serial port as a whole, generating a conflict-free channel switching control instruction by integrating a dynamic priority scheduling algorithm and combining a USB data transmission real-time load, a serial port communication request emergency degree and a device historical interaction record fed back by a state detection unit, and sending the conflict-free channel switching control instruction to the state detection unit; the analog switch unit is driven to complete channel gating; an analog switch unit; a grading protection unit; a protocol adaptation unit; and a state detection unit. Priority scheduling is carried out by means of the main control unit in combination with multi-dimensional parameters such as the transmission load of the USB-A interface and the communication emergency degree of the serial port UART, communication channels of the USB-A interface and the serial port can be flexibly switched, the flexibility and adaptability of interface switching are enhanced, and the problem of switching limitation caused by a single triggering condition is solved.

The invention provides a weak current acquisition circuit and electronic equipment, which are applied to the field of control or regulation systems, and the circuit converts an input current signal to be processed into a corresponding first voltage signal through a first analog switch, a second analog switch and sampling resistors corresponding to different gear control signals; the operation integration unit is used for amplifying the first voltage signal and generating an integration voltage signal, and then the analog-to-digital conversion unit is used for converting the integration voltage signal into a digital voltage signal; a control unit collects the digital voltage signal and calculates a target current value corresponding to the current signal to be processed according to the digital voltage signal. The circuit provided by the embodiment of the invention can be used for amplifying the current signal to be processed, carrying out analog-to-digital conversion on the integral voltage signal and acquiring the corresponding digital voltage signal according to the preset digital filtering algorithm, and can effectively reduce the influence of noise on the acquisition precision in the weak current acquisition process.

The invention discloses an automatic traversal test circuit, an automatic traversal test device, an interrupt request test method and an interrupt request test system, and the automatic traversal test circuit comprises a multiplexer which comprises N test pins, and the total number N of the test pins is the same as the number of to-be-tested interfaces of a to-be-tested chip; the chip to be tested and the multiplexer form multi-channel connection; the multiplexer further comprises at least one first control interface and a selection input end; the truth value state of the first control interface is changed under the action of the first control instruction, so that the selection input end is controlled to select a path corresponding to the target test pin to be conducted. According to the invention, the multichannel multiplexer analog switch is added in the test circuit to replace the function of manually plugging and switching pins. The multi-interface interrupt request automatic test of the chip to be tested can be realized.

The invention belongs to the technical field of analog switches, and particularly relates to a double-channel single-pole double-throw analog switch circuit which comprises two turn-off leakage compensation modules, two ISO isolation circuits, two turn-on leakage compensation modules, eight MOS tubes M5-M12 and a current source. All the devices are correspondingly connected according to a circuit diagram to form an analog switch circuit; the invention designs a dual-channel single-pole double-throw analog switch, a 0.25 [mu] m BCD process is adopted, two groups of completely consistent single-pole double-branch CMOS switches are arranged in a chip, the normal temperature interval is-40 DEG C to 125 DEG C, the analog switch can normally work under three power supply conditions of + / -15V, 12V, 0V and + / -5V, and the analog switch has the advantages of low on-resistance, high switching speed, high reliability and the like. And conduction electric leakage and turn-off electric leakage are small.

The invention belongs to the technical field of current source control, and particularly relates to a self-adaptive intelligent current source output control system, and the system works cooperatively through a plurality of modules: a load detection module monitors the load access state in real time, converts a current signal into a voltage signal Udetect, and outputs the voltage signal Udetect; the state stabilization filtering module receives the signal, filters high-frequency noise through an RC low-pass filtering unit, amplifies the signal through an in-phase proportion amplification unit, and is internally provided with a signal monitoring and judging unit to extract a load characteristic signal INPUTIDE in a stable working state; the feedback calculation module generates a feedback control parameter through preset threshold comparison and logical operation according to the INPUTIDE; the analog switch control module selects a resistance potential-divider network input channel according to the feedback control parameters, and outputs a current source regulation and control signal VC; and the adjustable current source module outputs a working current adaptive to the load according to the VC. The self-adaptive intelligent current source output control system is superior to a traditional system in dynamic adaptation, protection mechanism, multi-scene adaptation, precision and stability.

The invention provides a protocol interface circuit switching method for data acquisition and transmission of an unmanned ship, which belongs to the technical field of protocol interface circuit switching, and is characterized in that a multiplexing analog switch circuit and a standardized level conversion chip circuit are integrated in a circuit for data acquisition and transmission of the unmanned ship to realize seamless switching of communication ports among RS232, RS485 and TTL (Transistor-Transistor Logic); on the premise that navigation and operation of the unmanned ship do not need to be interrupted, a proper communication standard and a proper data transmission path are dynamically selected according to actual requirements. A multiplexing analog switch and a standardized level conversion chip are integrated in the circuit, so that seamless rapid switching among the RS232, the RS485 and the TTL can be realized. On the premise that navigation and operation of the unmanned ship do not need to be interrupted, a proper communication standard and a proper data transmission path can be dynamically selected according to actual requirements.

The invention relates to the technical field of direct current motor driving, and provides a high-speed direct current motor driving system which comprises a control module, a driving module and a feedback module and is based on an analog switch and an FPGA. By implementing the scheme, in the first aspect, the two sides of the direct current motor of the middle bridge arm of the full-bridge power circuit are each connected with a sampling resistor in series, and high-precision bidirectional current measurement of the direct current motor is achieved and the reliability of a driving system is improved through full-path detection and common-mode rejection under the condition that the power extension time and power consumption are not increased; and on the second aspect, the common-mode input voltage of the operational amplifier is relatively small through the use of the analog switch and the amplitude limiting diode, and the operational amplifier is not required to be limited by high common-mode voltage, so that the type of the operational amplifier with higher response speed can be selected. And thirdly, a fault detection unit and a redundancy check unit are arranged in the FPGA, and the safety and the reliability of the system are improved through cooperative work of the FPGA, a double-sampling resistor, an amplitude limiting diode and an analog switch.

A chess-like piece positioning and recognition system, including: an MCU, an RFID module, multi-channel analog switches, an electromagnet and communication signal switch unit, an electromagnetic drive unit, antennas, silicon steel blocks, and pieces. The MCU is used for communication with the RFID module, selecting channels of the multi-channel analog switches, and electromagnet and communication signal switch selection. The RFID module is used for reading information from the pieces. The multi-channel analog switches are used for group gating and intra-group channel gating of the RF channels. The electromagnet and communication signal switch unit is used for switching between the electromagnetic drive unit and the RF channels. The electromagnetic drive unit is used for driving an electromagnet. The antenna is used for sending and receiving signals from the pieces and also serves as the coil for the electromagnet. The silicon steel block is used as the core of the electromagnet, which generates a magnetic attraction to the pieces after being magnetized.

The invention discloses a multi-channel audio switching test circuit for a rail transit vehicle-mounted radio station and an implementation method, and is applied to the field of production test and fault maintenance of rail transit vehicle-mounted radio station equipment. Comprising a power supply circuit, an analog switch switching circuit, an audio channel switching circuit, an indicating lamp circuit, a tested equipment interface and an audio comprehensive tester interface. The audio channel switching circuit is respectively connected with the analog switch switching circuit, the tested equipment interface and the audio comprehensive tester interface; the power supply circuit is respectively connected with the indicator lamp circuit, the analog switch switching circuit and the audio channel switching circuit; the audio channel switching circuit comprises an audio switching circuit I, an audio switching circuit II, an audio switching circuit III, an audio switching circuit IV and an audio switching circuit V; according to the invention, the indexes of all audio channels of the tested equipment can be tested only through one-time equipment connection, and a tester does not need to carry out frequent line plugging and unplugging on each channel, so that the testing efficiency is greatly improved.

The invention discloses an ultrasonic transducer signal transmitting and receiving switching circuit, which comprises a signal transmitting module, an ultrasonic sensor A, an ultrasonic sensor B and a signal receiving module, and is characterized in that the ultrasonic sensor A is electrically connected with the signal transmitting module through a first analog switch group and a third analog switch group; the ultrasonic sensor B is electrically connected with the signal transmitting module through a second analog switch group and a fourth analog switch group; the ultrasonic sensor A is electrically connected with the signal receiving module through the first analog switch group and the fifth analog switch group, and the ultrasonic sensor B is electrically connected with the signal receiving module through the second analog switch group and the sixth analog switch group. The receiving and transmitting switching circuit suppresses the problem of receiving channel coupling in a manner of consuming an interference signal coupled by an analog switch through grounding.

The invention relates to an electric control system test board for engineering equipment, which comprises a test box, a comprehensive controller, an operation control box, a closed pump control box and a computer, the test box is connected with a tested electric control system through a test cable, and the electric control system is tested by pulling a toggle switch on a panel of the test box or rotating a single-circle carbon film potentiometer. An analog switching value or an analog quantity electric signal is transmitted to a tested electric control system and processed by an electric control system controller to control a corresponding system state indicating lamp on the test box to be lighted so as to test the correctness, stability and safety of the function of the electric control system, and the system can be operated by a single person, is simple and convenient to operate, is high in test response speed, and is visual and clear in test result. Powerful support is provided for early-stage performance analysis, system design, test verification and production delivery of the electric control system of the engineering equipment, so that the production quality of the engineering equipment is continuously improved, the time, manpower and material cost is reduced, and the development and production cycle is shortened.

The invention provides a single-electrode silica gel sheet test circuit, device and method for physical therapy. The single-electrode silica gel sheet test circuit comprises a microcontroller, a Darlington tube array chip circuit, a relay array, a signal conditioning circuit and the like. The microcontroller controls the Darlington array to amplify low-power signals, drives the relay array to achieve selection of different test paths, collects and processes test data, and transmits the test data to the computer through a serial port. The relay array alternately switches paths to complete each test item; the signal conditioning circuit is used for adjusting a test signal to meet the AD sampling requirement; the digital control analog switch realizes multiplexing of multiple paths of signals, and a single AD port acquires multiple paths of signals; and the state indicating circuit displays the test result and gives an alarm prompt. The system is specially used for a single electrode plate test scheme, the installation complexity can be remarkably reduced, the stability is improved, and the efficiency is greatly improved.

The utility model discloses a response bandwidth measuring device of a capacitive tip clearance measuring system based on an analog switch, the capacitive tip clearance measuring system is composed of a capacitive sensor, a measuring system host and an upper computer which are connected in sequence, and the measuring system host comprises a signal demodulation module and an acquisition module. The capacitive sensor consists of a sensor probe and a three-coaxial cable which are connected with each other; the response bandwidth measuring device replaces the sensor probe and is connected with the tri-coaxial cable through an SMA connector, and the response bandwidth measuring device adopts an analog switch to simulate capacitance change caused by the fact that the tip of the rotating blade sweeps the sensor probe and simulate input of the capacitive tip clearance measuring system; the response bandwidth measuring device is composed of an analog switch, a first capacitor C1 and a second capacitor C2, the analog switch is connected with the first capacitor C1 in series after being connected with the second capacitor C2 in parallel, and the analog switch is simplified into a single-pole double-throw switch S and an equivalent capacitor Cs (off).

The invention relates to a flash program protection circuit and a flash program protection method, in particular to a flash program protection circuit and a flash program protection method in a power failure process of equipment, and solves the technical problem that an operation instruction of a flash chip is sent by mistake due to unstable core voltage of a main control chip in the power failure process of the equipment, so that the flash program is rewritten or erased. The single-pole double-throw analog switch is additionally arranged between the chip selection end of the main control chip and the chip selection end of the flash chip and / or between the data end of the main control chip and the data end of the flash chip, so that the main control chip is communicated with the chip selection end of the flash chip and / or the main control chip is communicated with the data end of the flash chip when the system is powered on, and is disconnected when the system is powered off; the chip selection signal and / or the data signal are / is disconnected, so that an operation instruction generated by the main control chip cannot be sent to the flash chip, and a flash program stored in the flash chip is prevented from being erased or rewritten.

The present invention provides an adaptive RS232 and RS485 interface circuit, including a connector, a communication switching module, an identification module, an active control selection module, an RS232 interface communication module, an RS485 interface communication module, and a logic control circuit. The connector is arranged at a physical interface for accessing an external communication device, the identification module is used to identify the physical interface type of the external communication device, and control the communication switching module to switch the interface communication module according to the identification result, the communication switching module is respectively connected to the RS232 interface communication module and the RS485 interface communication module, and the channel is selected by an analog switch to complete the automatic switching of the RS232 or RS485 communication mode, and the logic control circuit is respectively connected to the RS232 interface communication module and the RS485 interface communication module using a logic and gate chip. The present invention can realize the automatic identification and automatic switching of RS232 and RS485 communications, and has the advantages of high automation, low technical risk, low cost, domestic controllability, flexible control, high reliability, etc.

The invention discloses a system reference clock frequency accuracy automatic calibration circuit and a calibration method thereof, and belongs to the technical field of frequency sources, the calibration circuit comprises a first crystal oscillator, a first power divider, a second power divider, a second crystal oscillator, an analog switch, a radio frequency switch, a detector, a comparator, an FPGA controller, a digital analog converter, an operational amplifier and a temperature sensor. When an external high-precision reference clock is accessed, the FPGA controller automatically switches a frequency measurement reference, performs high-precision frequency measurement on a 100MHz signal output by the first crystal oscillator, and judges whether calibration is needed or not according to frequency offset; if calibration is needed, the output voltage of the digital-to-analog converter is adjusted, the Vc end of the first crystal oscillator is controlled after operational amplification, and frequency closed-loop adjustment is achieved. According to the method, the crystal oscillator does not need to be disassembled, calibration is rapidly completed on site, and system availability and long-term frequency stability are remarkably improved.

The invention discloses a power line troubleshooting practical training device which comprises an operation panel and a power supply module. The operation panel is used for arranging wires according to a preset circuit diagram and is detachably provided with a plurality of analog switches, a plurality of fault indicators, a display operation screen, a plurality of fault points, a plurality of data acquisition terminal units and a core control module; the power supply module is used for supplying power to the operation panel; the analog switch simulates switching on and switching off in a manual or automatic mode so as to achieve the effect of power supply switching. The fault point can simulate a fault condition; the fault indicator is connected with a specified fault point; the core control module is connected with the fault indicator and the data acquisition terminal unit, and is used for selecting the fault type and fault point setting of the current simulation line according to the signal of the display operation screen, and simulating the common fault type. According to the invention, a real-time simulation technology is adopted, so that trainees can carry out troubleshooting and processing in an approximately real environment, and thus the fault handling capability is improved.

The invention belongs to the technical field of integrated circuits, and particularly discloses a numerical control programmable gain amplifier chip, which adopts an SIP (Session Initiation Protocol) packaged operational amplifier, a digital potentiometer, an input end Vin and an output end Vout, and is characterized in that an alternating current signal is input from the Vin end and is connected to an inverted input end of the operational amplifier through a capacitor C1 and an input resistor R1; a positive power supply pin of the operational amplifier is connected with a power supply positive electrode VDD, a negative power supply pin is grounded, and a VDD / 2 direct current bias voltage is obtained by an in-phase input end through a precision resistance voltage dividing network and is accessed after low-pass filtering; the high end of the digital potentiometer is connected with the Vout end, the low end is connected with the inverting input end of the operational amplifier, and a feedback path is formed through a sliding end. The digital potentiometer and the operational amplifier are integrated, high integration and modularization of the programmable gain amplification circuit are achieved, and the problems that in a traditional discrete scheme, due to analog switch conduction resistance, gain precision is insufficient, reliability of a multi-element system is lowered, and the circuit size is large are solved.

The invention provides a nerve regulation and control system and method for a spinal cord ventral epidural region, and the system employs a microprocessor to generate multiple paths of pulse width modulation signals, and drives a voltage-controlled current source after amplitude adjustment. Stimulation current with adjustable frequency, pulse width and amplitude is output to act on a spinal cord ventral nerve structure. Real-time monitoring of stimulation current of each channel is realized through combination of voltage sampling and a single-pole multi-throw analog switch, feedback information of a body position, myoelectricity, pressure and other multi-mode sensors is fused, a closed-loop control mechanism is constructed, and dynamic adjustment and individualized optimization of electrical stimulation parameters are realized. The system has the advantages of being more accurate in electrical stimulation positioning, more sensitive in response, more intelligent in control and the like, and is suitable for intelligent rehabilitation intervention in scenes of spinal cord injury, cerebral palsy, neurological dysfunction and the like.

The invention relates to an analog switch capable of transmitting positive and negative voltages beyond a power rail, and belongs to the technical field of circuit structures. According to the analog switch capable of transmitting the positive and negative voltages beyond the power supply rail, the control logic module is used for controlling one of the on function module and the off function module of the complementary charge pump to work so as to control the on-off of the switch module, so that the problem that a power supply is lower than a signal range can be solved without constructing a negative-voltage charge pump; positive and negative voltages can be transmitted beyond a power rail, signals are not distorted, and the power consumption and the cost of an analog switch chip are greatly reduced. And the switch module adopts two NMOS (N-channel metal oxide semiconductor) tubes which are connected back to back, so that the switch does not generate electric leakage under negative voltage, the VISO can be always kept higher than the potential of the substrate by processing positive and negative voltages of the isolating ring, and the isolating ring always keeps reverse bias on a parasitic diode of the P-type substrate.

The invention relates to the field of electrochemical signal processing, and particularly discloses a wearable detection circuit for an electrochemical oxygen sensor, comprising: a transimpedance amplification module comprising an analog switch S1 and at least two feedback resistors with different resistance values, the feedback resistors being connected in parallel, the analog switch S1 being connected in series with the feedback resistors, the control circuit is used for controlling a feedback resistor connected to the circuit and outputting a first voltage signal; the active low-pass filtering module is used for filtering the first voltage signal and filtering thermal noise, power frequency interference and motion artifact noise to obtain a second voltage signal; the temperature calibration module is used for collecting temperature information; the microcontroller is used for providing driving voltage for the transimpedance amplification module and the active low-pass filtering module and receiving the temperature information and the second voltage signal; the microcontroller is used for receiving the second voltage signal and comparing the second voltage signal with a preset value. The technical scheme of the invention is high in precision and low in power consumption, and can reduce environmental interference.

The invention discloses a small signal output and automatic calibration system and method special for power secondary equipment. The system comprises a voltage acquisition loop, a current acquisition loop, an analog switch switching loop, an ADC sampling loop, an acquisition channel calibration module and a calibration parameter calculation module. According to the invention, the internal resistor of the DAC is combined with the operational amplifier to acquire the output current of the current acquisition loop, so that the use of external elements is avoided; meanwhile, voltage and current signals are combined and sent to the ADC sampling loop through the analog switch switching loop, calibration parameters are automatically calculated in combination with a calibration algorithm, the output precision is ensured, the influence of switch network on-resistance errors and external element drift is eliminated, and synchronous monitoring and automatic calibration are achieved.

The utility model provides an electrical parameter measuring circuit, an electrical parameter measuring unit comprises a plurality of signal driving ends and a plurality of voltage output ends, each signal driving end corresponds to one voltage output end, and the measuring signal output end of each analog switch is correspondingly connected with one signal driving end; each sampling output end of the multiplexer is connected with the input end of the signal conditioning unit, and the voltage input end corresponding to the sampling output end is connected with one voltage output end in the electrical parameter measuring unit; the input end of the analog-to-digital conversion unit is connected with the output end of the signal conditioning unit, and the output end of the analog-to-digital conversion unit is connected with the input end of the main controller. In the scheme, a discrete scheme is replaced by the chip for measuring the electrical parameters, a single chip realizes the functions of voltage and current conversion and amplification, digital-to-analog conversion, clamping, calibration and the like, and an external analog switch circuit is matched to realize single-board multi-channel test, so that the reliability of chip test is improved, and the test efficiency is improved. And the board occupation area is reduced.

The utility model belongs to the technical field of welding power supply interface circuits, and particularly discloses a pulse interface circuit between a PLC (Programmable Logic Controller) and a TIG (Tungsten Inert Gas) welding power supply, which is characterized in that a pin 1 of an analog switch chip accesses a peak welding current input signal through a terminal 3 of a wiring terminal; a pin 5 of the analog switch chip is connected to a base value welding current input signal through a terminal 4 of the wiring terminal, a pin 10 of the analog switch chip is connected to a pulse width modulation signal through a terminal 1 of the wiring terminal, a pin 3 of the analog switch chip is electrically connected with one end of a voltage-regulator tube D4, and the other end of the voltage-regulator tube D4 is connected to a negative electrode of the power supply. According to the utility model, a pulse interface circuit is formed through the connection relation among the analog switch chip, the voltage-regulator tube, the resistor, the capacitor and the wiring terminal, so that a pulse width modulation signal PWM and an analog quantity signal of the PLC controller are converted into a pulse signal of a TIG welding power supply.

The invention discloses a temperature drift suppression method and circuit for a charge and discharge capacitance detection circuit, and belongs to the technical field of electronic circuits. The circuit comprises a first GPIO interface, one end of which is connected with a capacitor to be tested through a first resistor; one end of the first analog switch is connected with the capacitor to be tested; one end of the second GPIO interface is connected with the power supply negative electrode end of the first analog switch, and one end of the third GPIO interface is connected with the output end of the first analog switch; the input end of the second analog switch is connected with the output end of the first analog switch, and the output end of the second analog switch is connected with a first capacitor; the input end of the second analog switch can be grounded through a third GPIO interface; in the charging stage, the capacitor to be tested can be charged through the first resistor and the high level output by the first GPIO interface, the second GPIO interface also outputs the high level, and the potential difference between the positive electrode and the negative electrode of the first analog switch is reduced.

The invention relates to a multi-channel multi-form temperature acquisition system based on an FPGA (Field Programmable Gate Array). The multi-channel multi-form temperature acquisition system comprises a multi-channel analog switch unit, a conditioning circuit, an analog-to-digital converter, an FPGA circuit, a memory and a selection unit, according to the invention, errors of different sensors at different temperatures can be corrected, the correction coefficient is stored in the memory, the FPGA circuit calls the corresponding correction coefficient according to task requirements, and the temperature acquisition precision is improved.