113results about "Logic circuit coupling arrangements" patented technology

The invention provides a digital isolator with both high-speed communication and high common-mode transient immunity. The digital isolator comprises a transmitter, a coupling inductor and a receiver, the transmitter comprises an oscillator, a modulation capacitor assembly and a common-mode transient immunity enhancement module; the oscillator is configured to receive a data signal and generate a first differential signal based on the data signal; the modulation capacitor assembly is configured to modulate a code element 0 into a first frequency and modulate a code element 1 into a second frequency; the common-mode transient immunity enhancement module is configured to determine a bias control signal according to the first differential signal; the receiver is configured to receive the second differential signal and obtain a square wave signal based on the second differential signal; obtaining a triangular wave signal based on the square wave signal; obtaining the maximum value of a triangular wave signal according to the falling edge signal of the square wave signal; and obtaining a target data signal based on the maximum value, so as to solve the problem of low communication and common-mode transient immunity performance of the existing digital isolator.

The invention relates to a full duplex digital isolator. A circuit is provided. The circuit comprises: a first transmitter circuit having a first input terminal arranged to receive first input data and a first node arranged to transmit first intermediate data corresponding to the first input data; a first receiver circuit including a second node arranged to receive the first intermediate data and a first output terminal arranged to generate first output data corresponding to the first input data; comprising a second input terminal and said second node, the second input terminal arranged to receive second input data, the second node further arranged to transmit second intermediate data corresponding to the second input data; and a second receiver circuit comprising a first node and a second output terminal, the first node being further arranged to receive the second intermediate data, and the second output terminal being arranged to generate second output data corresponding to the second input data.

The application provides an inhibitor circuit, a signal sending device and a communication system, and relates to the field of digital information transmission.The inhibitor circuit provided by the application comprises a first transistor and a second transistor, a first switch, a second switch and a first voltage generation module.When communication ends, the first switch and the second switch are closed, and the first transistor and the second transistor are turned on.When the signals on the first communication bus and the second communication bus reach a common mode state, the first switch and the second switch are turned off.The application further provides an inhibitor circuit which adds an additional path on the basis of the above inhibitor circuit.The application further provides a signal sending device which comprises the above inhibitor circuit.The application further provides a communication system which comprises the above signal sending device.The inhibitor circuit, the signal sending device and the communication system provided by the application can reduce the amplitude of tailing overshoot and ensure accurate decoding at the receiving end.

The invention relates to the technical field of integrated circuits and provides an impedance adjusting method based on hybrid control and a resistance network. The method comprises: connecting a target resistor between a ground terminal and the second terminal such that the target resistor and the resistor network are connected in series between the first terminal and the ground terminal; closing all binary code switches of the binary code resistor array, and then gradually changing the thermometer code control code according to a first preset step length; maintaining the first thermometer code control code, and then gradually changing the binary code control code according to a second preset step length; and determining a hybrid control code of the resistance network corresponding to the resistance value of the target resistor. Therefore, not only is the problem of an intermediate transition state effectively solved, but also the complexity caused by excessive bit control bits is reduced as much as possible under the condition that the same precision is realized.

According to some embodiments, a receiver comprises a positive terminal, a negative terminal, a first isolation capacitor connected to the positive terminal, a second isolation capacitor connected to the negative terminal, a resistor circuit connected to the first isolation capacitor and the second isolation capacitor to define a first high pass filter, an amplifier connected to the first high pass filter, a level detector connected to the amplifier, and a second high pass filter connected between the first high pass filter and the level detector.

The application discloses a kind of sensing transducer and its voltage signal processing circuit, belong to the field of transducer, for using analog circuit to realize for sensor voltage signal segmented calibration, solved the problem that voltage signal is difficult to maintain higher signal accuracy under strong interference environment.Considering that the way of segmented calibration can improve the accuracy of sensor output voltage signal, and analog circuit has strong anti-interference ability, the segmented identification circuit of the application can deliver voltage signal to the segmented calibration circuit corresponding to the voltage value interval to which the voltage signal belongs, so that the segmented calibration circuit can multiply the received voltage signal by a predetermined slope and add a predetermined intercept, and output after signal conditioning circuit, so as to realize the segmented calibration of voltage signal, and each part of circuit is analog circuit, has strong anti-interference ability, so that voltage signal can maintain higher signal accuracy under strong interference environment, widen the application scenario of sensing transducer.

This invention discloses circuits and methods for active power supply decoupling in synchronous digital systems. An active decoupling unit, incorporating switched capacitors, addresses voltage dips caused by simultaneous switching events. During peak demand, the unit quickly discharges capacitors to stabilize the supply voltage, while recharging occurs during low-demand intervals. This approach significantly reduces the required capacitor size and enhances charge delivery efficiency. Additionally, complementary clock signals can synchronize decoupling units, allowing partial or full compensation during both rising and falling edges of the clock. The invention provides enhanced area efficiency and reliability in synchronous digital logic environments.

The application provides a non-immersed transmembrane pressure detection system, which is characterized in that: a liquid inlet detection module, a permeation end detection module, a backflow end detection module and a transmembrane pressure calculation module are arranged, a non-immersed transmembrane pressure detection circuit is arranged in each of the liquid inlet detection module, the permeation end detection module and the backflow end detection module, the corresponding transmembrane pressure calculation result is obtained by calculating the liquid inlet detection signal, the permeation end detection signal and the backflow end detection signal output by the circuit, a four-stage amplification and analog signal isolation circuit composed of a high-precision resistance voltage division network, a first-stage operational amplifier circuit, a second-stage operational amplifier circuit, a linear optical coupler, a third-stage operational amplifier circuit and a fourth-stage operational amplifier circuit is arranged in the non-immersed transmembrane pressure detection circuit, the detected current signal is converted into an electrical signal by using the operational amplification piezoelectric effect, and the piezoelectric type can provide an anti-interference signal electrical output after isolation chip. The application has good linearity, simple circuit calculation and effectively solves the problem of electrical signal isolation between an analog signal and a single-chip microcomputer application system.

In some examples, a circuit includes a window comparator circuit. The window comparator circuit is configured to receive a input signal and a feedback signal, determine a delayed representation of the feedback signal based on a window control signal, determine, based on the feedback signal and the delayed representation of the feedback signal, a time window, responsive to a rising edge of the input signal occurring in the time window, or responsive to a falling edge of the input signal occurring in the time window, determine that the input signal and the feedback signal are locked, and responsive to the rising edge of the input signal occurring outside of the time window, or responsive to the falling edge of the input signal occurring outside of the time window, provide a pulse signal having an asserted value for a programmed period of time.

The present description concerns a device comprising two oscillators coupled to each other so as to operate in quadrature, each oscillator comprising an inductor and a capacitive element having a value selectable from among at least two values, each corresponding to an operating frequency value of the oscillators, each oscillator being configured so that, for each operating frequency value of the oscillators, the quality factor of its inductor is lower than the quality factor of its capacitive element.

A retention flip flop includes a first latch, a second latch, and a retention latch. The first and second latches are powered by an interruptible primary supply voltage while the retention latch is powered by a secondary supply voltage that is not interrupted. The retention flip-flop receives a single retention control signal that controls whether the flip-flop is in a standard mode or a retention mode. In the retention mode, the flip-flop clock signal is paused.

Methods, apparatus, systems, and articles of manufacture are described to correct non-linearity in transmitters. An example system includes an input stage, a driver, an input terminal of the driver coupled to an output terminal of the input stage; an output buffer, an input terminal of the output buffer coupled to an output terminal of the driver, an output terminal of the output terminal coupled to a first input terminal of the input stage via a resistor; and non-linear correction circuitry having an input terminal and an output terminal, the input terminal of the non-linear correction circuitry coupled to the output terminal of the output buffer and the first input terminal of the input stage via the resistor, the output terminal of the non-linear correction circuitry coupled to the output terminal of the input stage and the input terminal of the driver.

A circuit with calibration function includes a fully differential amplifier circuit, two voltage generation circuits, two multiplexers, a comparator and a digital logic circuit. The fully differential amplifier circuit amplifies a pair of differential input voltages to generate a pair of differential output voltages. One voltage generation circuit utilizes a first current to flow through a capacitor to generate a first voltage. The other voltage generation circuit utilizes a second current to flow through a resistor to generate a second voltage. The multiplexers provide the pair of differential output voltages or the first and second voltages to the comparator according to a digital control signal. The digital logic circuit generates a first digital code to adjust a capacitance of the capacitor or a second digital code to adjust DC voltage levels of the pair of differential output voltages according to the comparison signal provided by the comparator.

A coupler includes a plurality of unit circuits connected to a plurality of differential line pairs and a single-ended line; and a plurality of isolation resistors connected between the plurality of differential line pairs, wherein each unit circuit of the plurality of unit circuits includes: a transformer including a primary side connected to one differential line pair among the plurality of differential line pairs, and a secondary side connected to the single-ended line, and a secondary-side capacitor connected in parallel to the secondary side.

The invention discloses a power failure detection circuit and an isolator circuit. The power failure detection circuit comprises a voltage detection circuit, a pulse width modulation circuit and a logic circuit, the voltage detection circuit receives power supply voltage and compares the power supply voltage with threshold voltage to generate a pre-power-off signal, and when the power supply voltage is smaller than the threshold voltage, the pre-power-off signal jumps from a first state to a second state. The pulse width modulation circuit generates a pulse width modulation signal according to an input signal, wherein a duty cycle of the pulse width modulation signal is related to a value of the input signal. The logic circuit generates a power-off control signal according to the pre-power-off signal and the pulse width modulation signal, and when a first preset edge of the pulse width modulation signal after the pre-power-off signal jumps from the first state to the second state comes, the power-off control signal controls the pulse width modulation signal to be kept in the first state.

Methods, apparatus, systems, and articles of manufacture are described corresponding to current limit circuitry with controlled current variation. An example circuit includes an amplifier having an input terminal and an output terminal; a capacitor having a first terminal and a second terminal, the first terminal of the capacitor coupled to the input terminal of the amplifier, the second terminal of the capacitor coupled to the output terminal of the amplifier; and diode circuitry having a first terminal and a second terminal, the first terminal of the diode circuitry coupled to the first terminal of the capacitor and the input terminal of the amplifier, the second terminal of the diode circuitry coupled to the second terminal of the capacitor and the output terminal of the amplifier.

The invention discloses an analog automatic pole-zero circuit which comprises a signal input module, a first follow-up phase end test, a digital adjustable resistor, a resistor, a capacitor, a comparator module and a single chip microcomputer. The invention also discloses an automatic pole-zero method based on the analog automatic pole-zero circuit, and the method comprises the steps: adjusting the digital adjustable resistor to a maximum value, setting the adjustable level module to be highest, gradually reducing the level until the level is appropriate, reducing the adjustable resistor until the level is appropriate, and obtaining an optimal pole-zero parameter value. According to the method, pole zero is realized by adopting an analog circuit, the problem of signal dynamic range matching is avoided, pole zero of large signals and continuous stacking signals can be realized, and compared with manual pole zero simulation, the complexity of manual debugging is avoided, and pole zero can be automatically simulated in real time at any time.

The main control device comprises a processing module with a switching pin and a plurality of signal pins, a first DIP switch, a second DIP switch, an inverting module, and a first switch and a second switch. The first DIP switch and second DIP switch are respectively connected to the signal pins through first and second signal switches. One end of the inverting module is connected to the processing module. The first switch connects to the first signal switches, the switching pin, the inverting module, and the operating voltage source. The second switch is connected to the second signal switches, the inverting module, and the operating voltage source.

A circuit is disclosed. The circuit includes a gallium nitride (GaN) switch having a gate terminal, a drain terminal and a source terminal, a driver circuit having an output terminal coupled to the gate terminal, where the driver circuit is arranged to generate an output voltage at the output terminal such that: the output voltage is at a first voltage when a voltage at the drain terminal is below a predetermined voltage; the output voltage is at a second voltage when 1) the voltage at the drain terminal is above the predetermined voltage and 2) a time period during which the output voltage is at the second voltage is less than a predetermined time. In one aspect, the second voltage is greater than the first voltage.

The invention discloses an isolation feedback circuit based on magnetic saturation self-oscillation, which is applied to a DC / DC module power supply with a preceding-stage PWM control circuit, and comprises a self-oscillation circuit, a voltage and current conversion circuit, a low-pass filter circuit and a signal acquisition circuit, the self-oscillation circuit comprises a saturation inductor and an asymmetric circuit; the input end of the voltage and current conversion circuit is connected with the output voltage end of the DC / DC module power supply, and the output end of the voltage and current conversion circuit is connected with a secondary winding of the self-oscillation circuit; the input end of the low-pass filter circuit is connected with the signal output end of the self-excited oscillation circuit, and the output end of the low-pass filter circuit outputs a feedback voltage signal; the input end of the signal acquisition circuit is connected with the output end of the low-pass filter circuit, and the output end of the signal acquisition circuit is connected with the preceding-stage PWM control circuit. The defect that an optical isolation scheme is insufficient in radiation resistance is overcome, the integration level and the response speed of the whole circuit are improved, and the reliability requirement of spaceflight long-life application is met.

An exemplary setup includes: a rectifier circuit arrangement comprising: a first resistor with one terminal; a second resistor with one terminal; a first transistor with a first terminal, a second terminal, and a control terminal; and a second transistor with a first terminal, a second terminal, and a control terminal;a reference circuit arrangement comprising a first input, a second input, a third input, a fourth input and an output, wherein the first input of the reference circuit arrangement is coupled to the control terminal of the first transistor, wherein the second input of the reference circuit arrangement is coupled to the terminal of the second resistor and the first terminal of the second transistor, wherein the third input of the reference circuit arrangement is coupled to the control terminal of the second transistor, and wherein the fourth input of the reference circuit arrangement is coupled to the terminal of the first resistor and the first terminal of the first transistor.

This invention discloses an automatic tuning device and a shortwave therapy device, relating to the field of tuning. It includes: a solid-state source for generating an AC signal and outputting it to a coupler; a coupler for stepping down the AC signal and outputting it to a tuner, generating a DC feedback signal based on the AC signal and sending it to a controller; the value of the DC feedback signal is positively correlated with the value of the AC signal and negatively correlated with the degree of impedance matching; a tuner for adjusting its own impedance based on the adjustment signal output by the controller to match the impedance of the user's attached electrode pads; and a controller for controlling the solid-state source to generate the AC signal and generating the adjustment signal based on the DC feedback signal. When impedance matching is poor, the value of the DC feedback signal increases, requiring adjustment of the tuner's impedance to achieve impedance matching with the user. The controller controls the tuner to adjust its own impedance, eliminating the need for manual adjustment by the user and simplifying the adjustment process.

The invention discloses a high-voltage cable broadband impedance online test signal coupling device and a cable plug. The high-voltage cable broadband impedance online test signal coupling device comprises a signal coupling module and a protection control module. The protection control module is connected with the signal coupling module and comprises a control unit and a controlled switch unit; the control unit is used for generating and outputting a turn-off instruction when monitoring that the voltage of the high-voltage cable is changed from a non-voltage state to a voltage state; and the control module is used for delaying preset time after the turn-off instruction is generated, and generating and outputting a turn-on instruction after the voltage of the high-voltage cable is confirmed to be maintained in the voltage state again. According to the invention, a test signal channel can be automatically cut off at the moment of power-on of the cable, the impact of operation overvoltage on a rear-end broadband impedance spectroscopy analyzer is avoided, the reliability and safety of the whole test system are improved, and long-term and continuous online state monitoring becomes possible.

The invention discloses a compensation loop circuit for suppressing optocoupler thermally induced gain attenuation. The compensation loop circuit comprises a voltage reference module, an optocoupler isolation module and an optocoupler input end current-limiting resistor module. In order to solve the problem of loop gain attenuation caused by the negative temperature characteristic of the current transmission ratio in a traditional optocoupler isolation compensation network, a current-limiting resistor at the input end of an optocoupler is reconstructed into a series structure and is connected with an NTC thermistor in parallel to form a temperature self-adaptive bias network, and the network can automatically reduce the equivalent input resistance of the optocoupler along with the rise of the temperature, so that the gain of the loop is reduced. The loop gain attenuation is compensated in real time, and the left shift of the crossing frequency is inhibited. According to the invention, effective compensation for the negative temperature characteristic of the current transmission ratio of the optocoupler is realized through a pure analog circuit structure, the ride-through frequency deviation of the system is effectively inhibited in a wide temperature range of 25-105 DEG C, and the gain stability and dynamic response performance of the power supply in a severe temperature environment are remarkably improved; and meanwhile, the conciseness and reliability of the traditional scheme are kept.

In some examples, a circuit features a window comparator circuit.The window comparator circuit is designed to receive an input signal and a feedback signal, to determine a delayed representation of the feedback signal based on a window control signal, to determine a time window based on the feedback signal and the delayed representation of the feedback signal, to determine that the input signal and the feedback signal are locked in response to a rising edge of the input signal occurring within the time window, or to determine that the input signal and the feedback signal are locked in response to a falling edge of the input signal occurring within the time window, and to provide a pulse signal with a claimed value for a programmed time interval, either in response to a rising edge of the input signal occurring outside the time window or to determine that the falling edge of the input signal occurring outside the time window.

An amplifier circuit that includes a capacitor voltage divider that is selectively enabled with a switch. The circuit includes two capacitor banks where the banks are electrically coupled to opposing side terminals of the switch. When the capacitor voltage divider is not enabled, one bank is adjusted to control the gain of the amplifier. When the capacitor voltage divider is enabled, both banks are used to control the gain of the amplifier.

The invention discloses a dual-purpose multichannel rehabilitation electrical stimulator and a waveform generation method, and the electrical stimulator comprises a main control module which is used for generating a mode selection signal, a gating signal, a constant current signal, an electrical stimulation signal or an electric tactile signal; the polarity conversion module is used for generating a bipolar electrical stimulation waveform or a bipolar electric tactile waveform; the constant-current driving circuit is used for performing constant-current control on the current output by the polarity conversion module; the channel selection module is used for switching on and switching off a plurality of electrode points on the electric tactile electrodes; the electric tactile electrodes are used for outputting bipolar electric tactile waveforms; and the electrical stimulation electrode is used for outputting bipolar electrical stimulation waveforms. Through the integrated control module, the polarity conversion module, the channel selection module and other components, flexible switching and multi-channel adaptation of the electrical stimulation treatment and the electric tactile feedback function are realized, and the device has the advantages that integration of the electrical stimulation treatment and the electric tactile feedback function is realized, and the universality and the operation convenience of the device are improved.

This application provides a digital phase-locked loop (PLL), a PLL method, and an electronic device. The PLL includes a phase detection unit, a voltage-controlled oscillator (VCO), a central processing unit (CPU), and a digital-to-analog converter (DAC). The phase detection unit includes a mixer. The phase detection unit receives an externally input reference signal and a fundamental signal output from the VCO, performs phase detection based on the reference signal and the fundamental signal, and sends the resulting digital phase detection voltage to the CPU. The CPU performs preset type signal processing based on the digital phase detection voltage to obtain a target control word and sends the target control word to the DAC. The DAC outputs a control voltage according to the target control word to adjust the fundamental signal output by the VCO and achieve closed-loop locking. This application utilizes a mixer instead of an expensive digital phase detector for phase detection, achieving PLL locking and enabling the system to operate normally with high performance.

The invention discloses an anti-interference isolation circuit of an elevator interphone. An input terminal CN1; the normal phase end of the operational amplifier unit U22 is respectively connected with one end of the input terminal CN1 and an input voltage through a resistor R27 and a capacitor C26 in sequence, and the reverse phase end of the operational amplifier unit U22 is connected with the other end of the input terminal CN1 through a resistor R32 and a capacitor C28 in sequence; the positive phase end of the operational amplifier unit U18 is connected with the output end of the operational amplifier unit U22 through a resistor R28 and a capacitor C27 in sequence, the negative phase end of the operational amplifier unit U18 is connected with the output end, and the output end is further connected with the positive electrode of the light emitting end of the optocoupler U19; the negative electrode of the light-emitting end of the optocoupler U19 is grounded, the collector of the optocoupler U19 receives a voltage, the emitter of the optocoupler U19 is grounded through a resistor R103, the emitter of the optocoupler U19 is further connected with other peripherals, and electromagnetic interference and conducted interference generated in the elevator strong current environment are thoroughly blocked from two fundamental paths of power supply and signal transmission through the dual design of power isolation and signal isolation. And complete isolation of strong current and weak current is realized.

A circuit is disclosed. The circuit includes a modulator circuit referenced to a first ground and arranged to receive at least a first status identifier signal and a second status identifier signal, a pulse width modulated (PWM) signal and a first bitstream signal, and in response generate a modulated signal; an isolation capacitor coupled between to the modulator circuit and a demodulator circuit, wherein the modulator circuit is arranged to transmit the modulated signal through the isolation capacitor to the demodulator circuit; and a clock generator circuit arranged to generate a clock signal (CK0), where the PWM signal and the first bitstream signal are synchronized with CK0; and where the demodulator circuit is referenced to a second ground and is arranged to receive the modulated signal and generate output signals corresponding to the first and second status identifier signals, the PWM signal and the first bitstream signal.