414 results about "Analogue switch" patented technology

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 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.

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 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 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 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.

Provided in the present disclosure is a connector port multiplexing apparatus, comprising: a latch reset circuit, which is electrically connected to a first voltage source and a power terminal of a universal serial bus connector, and is configured to output a control signal on the basis of a first voltage that is output by the first voltage source and a second voltage from the universal serial bus connector; and an analog switch circuit, a control terminal of which is electrically connected to an output terminal of the latch reset circuit, a first terminal of which is electrically connected to a first signal transmission terminal of a universal serial bus controller, a second terminal of which is electrically connected to a second signal transmission terminal of the universal serial bus controller, and a third terminal of which is electrically connected to a multiplexing signal transmission terminal of the universal serial bus connector, wherein the analog switch circuit is configured to establish, on the basis of the control signal, a connection path between the first terminal and the third terminal of the analog switch circuit or a connection path between the second terminal and the third terminal of the analog switch circuit.

The invention relates to the technical field of electronic measurement, and provides a small electric field sensor which comprises a signal receiving module, a cascade gain module, a main control module, a gain control module and a filtering module. The signal receiving module is composed of a differential transmission interface and a double-diode. The cascade gain module comprises an instrument operational amplifier and two in-phase operational amplifiers SGM8061U8 which are connected in series; the main control module comprises an interface unit, a frequency measurement unit and a control unit; the gain control module is composed of an SGM4511 four-way analog switch; and the filtering module is composed of two groups of three-stage filters. The method is suitable for signal detection in various scenes such as aerospace, submarine and industrial equipment monitoring. The signal acquisition stability and response speed of the system in a complex electromagnetic environment can be improved.

The utility model provides a multi-path PD detection device which comprises a plurality of PD detection circuits and an MCU control chip, and each PD detection circuit is composed of a PD acquisition circuit, an analog switch circuit and an operational amplifier follower circuit. And the PD acquisition circuit sequentially comprises a capacitance limiting module, a PD input module, a resistance-capacitance module and a voltage following module, and is used for filtering, isolating and stabilizing the output signal of the photodiode. A plurality of PD signals are multiplexed by an analog switch and then are sequentially sent to an operational amplifier follower circuit, and finally efficient acquisition is realized through a small number of ADC (Analog to Digital Converter) interfaces. The device is modularized in structure, high in expandability, simple in structure, low in cost and excellent in real-time performance, has a large number of PD acquisition channels and a small number of ADC interfaces, and is suitable for realizing centralized acquisition of large-scale PD channels.

The application discloses an analog switch for improving channel isolation, and relates to the field of switch circuits.The application comprises N ports and N T-type switches, wherein one end of a first T-type switch is connected with a first port analog signal input end; the other end of the first T-type switch is connected with an analog-to-digital converter; one end of an Nth T-type switch is connected with an Nth port analog signal input end; and the other end of the Nth T-type switch is connected with the analog-to-digital converter.The application adopts complementary T-type NMOS and T-type PMOS parallel transmission, so that full-amplitude transmission of signals can be obtained, level loss is avoided, and on-resistance is reduced.

The invention discloses a wide-range switch tube leakage current detection method and system, and relates to the technical field of semiconductor device detection, and the method comprises the steps: connecting a to-be-detected NMOS switch tube with a trans-impedance amplifier, and collecting the drain current; the trans-impedance amplifier converts drain current into an output voltage signal V. The switchable feedback resistor at least comprises two feedback branches corresponding to different ranges. When it is detected that the output voltage approaches a negative output saturation threshold, a corresponding gain range is switched; before each measurement period, an analog-to-digital converter is grounded through an analog switch, system offset voltage is sampled, and a digital compensation value of switch tube leakage current is calculated and compensated; rC low-pass filtering and software notch filtering are carried out on the compensated voltage signal, and then sampling is carried out; and comparing the sampling result with a preset threshold value, and outputting a leakage current detection result. According to the invention, the accuracy of the measurement result of the drain current of the NMOS transistor is improved, and the reliability of device performance evaluation is guaranteed.

The utility model relates to electromagnetic flowmeter technical field, the utility model discloses a kind of electromagnetic flowmeter transmitter with temperature measurement, including through power supply circuit and signal isolation circuit connection control circuit and signal processing circuit, the signal processing circuit includes the wiring terminal J8 of realizing multiple wiring mode;Based on the selective connection temperature sensor of wiring terminal J8, temperature signal is connected to the input end of operational amplifier UT1A by analog switch U18 output, based on the input end of analog-digital converter U19 connected to the output end of operational amplifier UT1A;The control pin of analog-digital converter U19 is connected to control circuit, for controlling the collection and transmission of data, the utility model is through integrated multifunction and flexible measurement mode, high precision, high flexibility, low cost, high reliability and strong anti-interference ability are realized, the efficiency and performance of industrial measurement system are significantly improved.

The utility model relates to a circuit for avoiding train running data sharing storage duplex, and belongs to the technical field of train running data safety. According to the utility model, the analog switch is arranged to realize the switching between the memory and the equipment master control module and the external access module, and at most only one of the equipment master control module and the external access module can access the memory at the same time, so that the console is not networked through the equipment master control module; the problem of data leakage of the console connected with the external access module when the external access module and the equipment master control access the memory at the same time is avoided, and the data security is improved.

The application discloses a kind of low conduction resistance flatness analog switch structure of circuit design technical field, including CMOS transmission gate circuit and gate voltage adjusting circuit, CMOS transmission gate circuit includes transmission gate and auxiliary circuit, transmission gate and auxiliary circuit are electrically connected, CMOS transmission gate circuit is used for the signal transmission of main path;Gate voltage adjusting circuit is connected between the gate of PMOS pipe of CMOS transmission gate circuit and the gate of NMOS pipe.The whole input voltage range is handled by gate voltage adjusting circuit in the application, according to input voltage variation, output different slope gate control voltage, to reduce the conduction resistance variation of CMOS transmission gate, to reduce the purpose of conduction resistance flatness.

The application discloses an analog switch circuit and a chip with overvoltage protection. The analog switch circuit comprises a switch unit, a substrate selection unit and an overvoltage detection unit; wherein the output end of the substrate selection unit is connected with the switch unit and the overvoltage detection unit, and the output end of the overvoltage detection unit is connected with the control end of the switch unit. The overvoltage detection unit is used for generating and outputting a second control signal and a third control signal according to a first control signal, an input analog signal and a power supply voltage, and controlling the on-off state of the switch unit. When overvoltage occurs at the input end of the analog switch circuit in the off or on state, the analog switch circuit can keep or turn to the off state, thereby avoiding problems such as the analog switch being unable to be turned off, the device being damaged and the performance being poor due to the input overvoltage.

This invention discloses an automated testing method and system for the dynamic compensation of analog switch turn-off isolation, relating to the field of isolation testing technology. It includes information acquisition: acquiring test information on previous switch turn-off isolation, including test switch information, test environment information, interference signal information, and test results. This invention systematically utilizes environmental and interference factors from previous test information to classify and store test data, constructing multiple dedicated data sub-libraries for each category. This enables the isolation testing model to accurately test the target switch information under different test scenarios and interference information. Furthermore, the output not only provides multi-level test results including fuzzy and precise outputs, improving the comprehensiveness and accuracy of the test, but also effectively combines target switch information with fuzzy output technology, enhancing the flexibility and robustness of the test, and improving the automation level and reliability of the test process.

This utility model discloses an airship control system based on an execution drive encoder board, comprising a flight control computer, an execution drive encoder board, a logic control circuit, and output ports. The flight control computer can output six control signals (PWM0-PWM5). The execution drive encoder board integrates six 2-to-1 analog switches, with the switch inputs connected to the six PWM signals output from the flight control computer and the execution drive board, respectively. The logic control circuit consists of OR gates, XOR gates, and AND gates, with its inputs connected to the control terminals of each analog switch, receiving control authority feedback signals from the execution drive board and control status feedback signals from the flight control computer. The output ports output the six PWM signals selected by the analog switches, respectively driving the servos corresponding to the horizontal tail, vertical tail, duct tilt, duct lock, engine throttle, and engine shutdown. This solution addresses the problems of insufficient control signal switching flexibility, incomplete control logic, and poor system scalability in existing airship control systems.

The embodiment of the invention relates to the technical field of vehicles, and discloses a hand-leaving detection system, a steering wheel assembly, a hand-leaving detection method and a vehicle, the hand-leaving detection system comprises a detection module, an amplifier, an analog switch chip and a first MCU chip; the detection module is configured to obtain a gesture capacitance signal and output the gesture capacitance signal to the amplifier; the analog switch chip is configured to respond to the starting of an auxiliary driving function, switch to a starting state, connect the output end of the amplifier with a path of the first MCU chip, and activate the first MCU chip; and in response to the closing of the auxiliary driving function, switching to a closed state, cutting off a path between the output end of the amplifier and the first MCU chip, and enabling the first MCU chip to sleep. According to the embodiment of the invention, the situation that the first MCU chip continuously generates heat to cause local heating of the steering wheel assembly can be prevented, and the user experience can be improved.

The application relates to the technical field of embedded application, in particular to a microcontroller current self-detection circuit structure. The microcontroller current self-detection circuit structure comprises the following steps: an arbitrary GPIO port of a microcontroller is connected to the CLR input end of a counter as an output control signal; the Qn output end of the counter is connected to the gate of a PMOS tube; the Qn+1 output end of the counter is connected to the enable end of an analog switch and the WKUP input end of the microcontroller; the first resistor R1 and the second resistor R2 are connected in series between the power supply VCC and the power supply end VDD of the microcontroller; the drain-source of the PMOS tube is connected to the two ends of the second resistor R2; the positive and negative input ends of a differential operational amplifier are connected to the power supply VCC and the power supply end VDD of the microcontroller respectively; the output end of the differential operational amplifier is connected to one end of the third resistor R3 through the analog switch; and the other end of the third resistor R3 is connected to the positive end of the capacitor C. The application relies on the ADC of the microcontroller itself, realizes the self-detection of the power consumption current of the microcontroller under the full mode condition with relatively low cost and in a more convenient and fast manner.

The invention relates to a high-throughput cell electric signal exporting device based on an analog switch, a cell impedance detection system and a detection method, and belongs to the technical field of biomedical detection equipment. The system achieves the functions of image observation and cell electric signal export at the same time, and is characterized in that a more complex circuit layout is achieved by using a smaller PCB size. According to the system, by integrating temperature control and electric signal conduction, the function of an existing microscope is utilized, electric signal conduction is completed, and a brand new technical scheme is provided for biological experiments such as analysis of the growth state, the adhesion degree and the migration ability of cells.

The invention discloses an extensible three-dimensional electrical impedance imaging electrode array device, and belongs to the technical field of biomedical measurement. The device comprises a two-dimensional electrode interface module which is connected with original two-dimensional equipment through a series input and expansion interface; the three-dimensional common electrode array comprises a plurality of groups of electrodes at different horizontal layers; the input end of the three-dimensional electrode control module is connected to the two-dimensional electrode interface module, and the output end of the three-dimensional electrode control module is connected to the three-dimensional common electrode array. The control module comprises an electrode array control connector which is connected in parallel and an isolation type analog switch unit of a multi-stage series analog switch structure. By sending a control signal to the control connector, all electrode channels on a certain layer in the three-dimensional electrode array are uniformly gated, and original two-dimensional measurement is mapped to a three-dimensional space. According to the invention, three-dimensional measurement can be realized without changing the original equipment, the number of vertical layers expanded by serial connection of interfaces is supported, the number of horizontal electrodes expanded by parallel connection is controlled, and high compatibility, high expansibility and excellent signal isolation capability are realized.

Analog switch circuit, control circuit and control method thereof. The analog switch circuit includes a switch unit and a control circuit. The control circuit includes a sensing circuit and a gate-source voltage adjusting circuit. The switch unit is used to operate a first switch therein according to a first gate-source voltage to convert an input signal at an input terminal into an output signal at an output terminal. The sensing circuit is coupled between the input terminal and the output terminal and is used to generate a sensing signal according to a voltage difference between the output signal and the input signal. The gate-source voltage adjusting circuit is coupled with the sensing circuit and is used to adaptively adjust the first gate-source voltage according to the sensing signal so that a channel resistance of the switch unit remains at a fixed value when the voltage difference changes.

The invention discloses a network communication module, a communication method and a communication system, and belongs to the technical field of communication equipment. The network communication module comprises a control module and an audio module connected with the control module; the first analog switch is provided with a first transmission channel and a second transmission channel, and the first transmission channel is connected with the third transmission channel of the second analog switch; the second transmission channel is connected with an encryption module, and the encryption module is connected with a fourth transmission channel of the second analog switch; the network inlet is connected with the control module, and the network outlet is connected with the second analog switch. The network communication module provided by the invention has two independent transmission lines, and the control module can control the audio information to be encrypted and transmitted through the first analog switch and the encryption module to the second analog switch, and also can control the audio information to be transparently transmitted through the first analog switch to the second analog switch; switching of two voice modes of a common mode and an encryption mode is achieved, and different transmission scene requirements are met.

The application discloses a display device and a quality compensation driving method thereof. The display device comprises a first substrate and a second substrate arranged oppositely, a plurality of source lines, a plurality of gate lines, a plurality of pixel units defined by the intersection of the source lines and the gate lines, and at least one analog pixel unit arranged outside a display area on the first substrate; the second substrate is provided with a plurality of common electrode lines extending along the direction of the gate lines, and each common electrode line corresponds to a row of pixel units. The analog pixel unit comprises an analog switch element and an analog pixel electrode, the control end of the analog switch element is electrically connected with the gate line, the first end is electrically connected with the source line, the second end is electrically connected with the analog pixel electrode, and the analog pixel electrode is electrically connected with the corresponding common electrode line on the second substrate through a conductive connecting piece. The display device and the quality compensation driving method thereof fundamentally solve the display unevenness problem caused by RC delay, are simple in structure and do not increase additional cost.

The invention discloses a trusted start control method for a modular separation design embedded system, the embedded system comprises a core board and a special bottom board, the core board is integrated with a processor and a first BIOS, and the special bottom board is integrated with a trusted computing module, a second BIOS, an analog switch and a chip selection controller; the method comprises the following steps that after the embedded system is powered on, the trusted computing module prevents the processor from being started through a control signal, and the analog switch is controlled to switch a data path of the second BIOS to the trusted computing module; the trusted computing module reads the boot firmware in the second BIOS for trusted measurement, if measurement succeeds, the analog switch is controlled to switch a data path of the second BIOS to the processor, and the processor is allowed to be started; if the measurement fails, the processor is continuously prevented from being started. According to the method provided by the embodiment of the invention, the trusted root is preferentially started and actively measures the boot firmware, the code executed by the processor is ensured to be trusted, and a trust chain is established from the source.

The invention belongs to the field of semiconductor lasers, and provides a semiconductor laser diode driving circuit and a driving method. Comprising a single-pole multi-throw analog switch, a power triode driving circuit, a constant current mode feedback loop, a constant voltage mode feedback loop, a constant power mode feedback loop and an incoherent control circuit. The power triode driving circuit comprises a controller, a digital-to-analog converter, a power triode Q1, an integrator circuit based on an operational amplifier, a voltage source VCC, a laser diode V1 and a power resistor R2; the single-pole multi-throw analog switch is connected with the controller, and the controller controls the digital-to-analog converter; the single-pole multi-throw analog switch is respectively connected with the constant current mode feedback loop, the constant voltage mode feedback loop and the constant power mode feedback loop, and switching control of a constant current mode, a constant voltage mode and a constant power mode is realized through channel opening and closing of the single-pole multi-throw analog switch. According to the invention, the defects of single working mode, lack of coherence regulation and control capability and insufficient digitization degree in the prior art are overcome.

The application relates to a multi-channel furnace temperature acquisition device based on a multi-layer cascade analog switch circuit, wherein a power module is connected with a multi-channel signal selection module, a temperature signal processing module, an MCU module, a storage module and a display module; the output end of a temperature information acquisition module is connected with the input end of the multi-channel signal selection module; the output end of the multi-channel signal selection module is connected with the input end of the temperature signal processing module; the input and output ends of the temperature signal processing module are connected with the input and output ends of the MCU module; the input and output ends of the MCU module are connected with the input and output ends of the storage module; the output end of the MCU module is connected with the input end of the multi-channel signal selection module; and the output end of the MCU module is connected with the input end of the display module. The application meets the demand of multi-channel temperature measurement in a large space and a strong electromagnetic interference environment, and has the characteristics of high speed, high reliability, high precision, wide range and the like.

The present application belongs to the technical field of current source control, and particularly relates to a self-adaptive intelligent current source output control method, comprising: obtaining, by a load detection module, a state voltage signal of whether a load exists and its basic characteristics; inputting the state voltage signal into a state stabilization filtering module to extract a load characteristic signal in a stable working state; inputting the load characteristic signal into a feedback calculation module, analyzing and operating the load characteristic signal according to a preset algorithm model to generate a feedback control parameter; inputting the feedback control parameter into an analog switch control module, selecting an input channel of a resistance voltage division network according to the feedback control parameter, and then outputting a current source regulation signal VC; and inputting the current source regulation signal VC into an adjustable current source module to adjust an output current according to the current source regulation signal VC to meet the load requirements. The present application can be used to solve the problems of slow response, low regulation accuracy and poor adaptability of the current source under complex load conditions in the prior art.