150 results about "Resistive circuits" patented technology

The invention belongs to the technical field of analog integrated circuit design and memory read-write, and provides a multi-valued RRAM read-write circuit with a write-and-read function. The multi-valued RRAM read-write circuit is a multi-port device capable of performing read-write simultaneously, in write operation, a low dropout regulator is utilized to provide voltage for the RRAM circuit and the standard resistance circuit, mirror current is generated, the resistance value of the RRAM is set to be the total resistance of the standard resistance circuit, an operational amplifier is connected into the circuit through a CMOS switch, and feedback is formed to stabilize the voltage at the two ends of the RRAM; and in the read operation, the CMOS switch is used for disconnecting the operational amplifier, and the voltage at the two ends of the RRAM device is directly read. Compared with an existing multi-valued read-write circuit, the multi-valued RRAM read-write circuit has the advantages that write-and-read multi-valued RRAM read-write is realized, and meanwhile, the read-write circuit is not separated, so that the write-in speed is increased, and the area of the read-write circuit is saved.

A gate driver system for a multi-phase inverter includes a gate controller, a gate driver circuit, and a hybrid switch power module integrated into a phase leg of the multi-phase inverter. The hybrid switch power module includes a first semiconductor switch connected in parallel with a second semiconductor switch. The first semiconductor switch has first conduction characteristics, while the second semiconductor switch has second performance characteristics. The gate driver circuit includes a gate driver, a first variable resistance circuit, and a second variable resistance circuit. The first variable resistance circuit is powered by a first low-voltage DC power bus, while the second variable resistance circuit is powered by a second low-voltage DC power bus.The first variable resistance circuit is connected to a first gate of the first semiconductor switch, while the second variable resistance circuit is connected to a second gate of the second semiconductor switch.

The invention discloses a high-side driving circuit, an electronic device, a vehicle and a control method. False triggering of a short-circuit protection mechanism is avoided. The high-side driving circuit comprises a power distribution circuit, a sampling circuit and a fault protection circuit, the power distribution circuit comprises a PMOS transistor and a first resistance circuit; the grid electrode of the PMOS tube is grounded through the first resistance circuit, the drain electrode of the PMOS tube is connected with a load, and the source electrode of the PMOS tube and the input end of the fault protection circuit are connected with a power supply; the output end of the fault protection circuit is connected with the grid electrode of the PMOS tube; the sampling circuit is connected with the drain electrode of the PMOS tube and the ground; the output end of the sampling circuit and the control end of the fault protection circuit are connected to the control unit; the control unit judges whether load short circuit occurs or not according to the sampling voltage, if not, the fault protection circuit is forbidden to output voltage, and if yes, the fault protection circuit is controlled to convert input voltage into target voltage to be output; the PMOS tube is in a variable resistance region when the fault protection circuit has no voltage output, and enters a cut-off region when the PMOS tube outputs a target voltage.

A temperature sensor circuit includes a gallium nitride (GaN) integrated circuit (IC) die including a temperature sensitive two-dimensional electron gas (2DEG) resistive circuit element that includes a 2DEG channel; and a sensing circuit included to sense resistance of the temperature sensitive 2DEG resistive circuit element.

The aerosol generating device includes a battery, a DC / DC converter configured to boost the voltage of the battery to supply a boosted voltage to the first heater and the second heater, a first resistor circuit connected in series with the second heater and used to sense the current flowing through the second heater, a second resistor circuit connected in series with the first resistor circuit and used to reduce the peak value of the current flowing through the second heater, an operation switch that determines whether to pass current through the second heater, and a processor for controlling the battery, the DC / DC converter, and the operation switch.

The application discloses a DC-DC converter circuit based on over-temperature protection threshold adjustment, and an over-temperature detection module comprises: a first transistor circuit, the base of the transistor is connected with the reference voltage VBG output end of a band gap reference module, a positive temperature coefficient voltage proportional to absolute temperature is generated; a voltage dividing circuit input end is connected with the positive temperature coefficient voltage output end, the positive temperature coefficient voltage is divided to generate a detection voltage; a second transistor circuit, the base of the transistor is connected with the detection voltage output end, an over-temperature protection signal OTP is output to shut down the main circuit of the converter; an adjustment resistance circuit receives a digital adjustment signal; the digital adjustment signal changes the voltage dividing ratio of the positive temperature coefficient voltage divided to the detection voltage by controlling the equivalent resistance value of the adjustment resistance circuit; the change direction of the voltage dividing ratio is opposite to the change direction of the reference voltage VBG caused by adjustment. The application significantly improves the accuracy, consistency and overall reliability of the over-temperature protection threshold.

A self-calibration digital-to-analog converter (DAC) and a calibration method for DAC are provided. The circuit includes a resistor circuit, a buffer amplifier, a fine-tuning circuit, and a correction switching circuit. In normal operation mode, the resistor circuit receives the common voltage for conversion. In correction mode, the circuit performs self-correction in a sampling time and a comparison time. During the sampling time, the resistor circuit receives the reference voltage and first correction data, and the buffer amplifier input samples the voltage. During the comparison time, the resistor circuit receives the common connection voltage and second correction data, and the fine-tuning circuit adjusts the correction data until the buffer amplifier output voltage flips and records the correction value corresponding to the second correction data. With this self-correction mechanism, the circuit can output theoretically correct digital-to-analog conversion results under the reference voltage and common connection voltage.

An apparatus comprising: a driving circuit; a switchable termination resistance circuit configured to selectively provide a resistance based on an output of the driving circuit; wherein the output of the driving circuit is provided by a parallel arrangement of a first branch having a first switch and a second branch having a second switch, wherein the second branch provides greater current than the first branch, and wherein the driving circuit is configured to provide, in response to an enable signal received at an input of the driving circuit, the output comprising a first current by turning on the second switch for a predetermined time period following the provision of the enable signal to cause the provision of the termination resistance, and, after said predetermined time period, turn off the second switch such that the output comprises a second current, less than the first current.

A multi-phase inverter coupled to an electric machine includes a gate driver system with a gate controller operatively connected to gate driver circuits and hybrid switching power modules. The hybrid switching power modules are integrated into the phase strings of the inverter, which are connected to the electric machine via AC power connections. Each hybrid switching power module includes a first semiconductor switch connected in parallel with a second semiconductor switch, the first semiconductor switch having different performance characteristics than the second semiconductor switch. The gate driver circuit includes a gate driver, a first variable resistance circuit, and a second variable resistance circuit. The gate controller is connected to the gate driver circuit via a plurality of connections.The gate controller generates control signals that are passed to the gate driver circuit to control the hybrid switching power module via the connections.

The application discloses a kind of adjustable low-pass filter circuits based on self-bias pseudo resistance, the filter circuit includes: self-bias pseudo resistance circuit, differential source follower circuit and gain compensation circuit.The self-bias pseudo resistance circuit is made of back-to-back PMOS transistor, and its gate-source voltage is controlled by the direct current component of system input signal and output signal, so as to realize the function of adjustable large resistance;The differential source follower circuit uses common-drain amplifier, and converts passive amplifier into active amplifier with large input impedance and medium output impedance, while providing stable adjustable bias for the above-mentioned pseudo resistance;The gain compensation circuit is used to compensate for the gain loss of the common-drain amplifier due to the substrate effect.The low-pass filter circuit of the application can achieve considerable time constant with very small chip area and power consumption, and can be used in wearable physiological signal detection device, with the advantages of low power consumption, small area, high stability and the like.

A tunable termination resistor circuit associated with a line driver in a line on-chip is provided. The circuit includes a first current source and a first resistor coupled to the first current source and the line. The circuit also includes a first diode comprising a first terminal and a second terminal, the first terminal being coupled to the first resistor and the second terminal being coupled to a gate of a transistor, the gate being coupled to a gate voltage. The circuit also includes a capacitor coupled to the gate and the source of the transistor. The circuit also includes a third resistor coupled in series to a fourth resistor in the line each of the third resistor and the fourth resistor comprising a resistance changed by the gate voltage. There are other embodiments as well.

The present invention provides a technology capable of performing output adjustment with high accuracy in current detection. An adjustment circuit according to the present disclosure comprises: a first amplifier; and a first resistor circuit connected to an inverting input and an output of the first amplifier. The first resistor circuit has a plurality of first pads on which a resistor or a jumper can be mounted. On each of the plurality of first pads, either the resistor or the jumper is mounted, or none of the resistor or the jumper is mounted. The first resistor circuit has a first combined resistance value corresponding to the combination thereof, and adjusts and outputs the gain of the input voltage by using the first combined resistance value.

The invention discloses a high-side driving circuit, electronic equipment and a vehicle, relates to the technical field of power electronics, and improves the response speed of overcurrent protection of the high-side driving circuit. The high-side driving circuit comprises a power distribution circuit and a current-limiting protection circuit, the power distribution circuit comprises a PMOS transistor and a first resistance circuit; the grid electrode of the PMOS tube is grounded through the first resistance circuit, the drain electrode of the PMOS tube is connected to a load, and the source electrode of the PMOS tube and the input end of the current-limiting protection circuit are connected to a power supply; the output end of the current-limiting protection circuit is connected with the grid electrode of the PMOS tube; when the current-limiting protection circuit detects that the load current exceeds a preset value, the current-limiting protection circuit is switched from a closed state to an open state; the current-limiting protection circuit converts an input voltage into a target voltage to be output in an open state, and has no voltage output in a closed state; the PMOS tube is in a variable resistance area when the current-limiting protection circuit is in a closed state, and is in a constant current area when the current-limiting protection circuit is in an open state.

A phase-locked loop circuit includes a phase-frequency detector circuit, a time amplifier circuit, a control circuit, and a variable oscillator circuit, such as a voltage-controlled oscillator. The phase-frequency detector is configured to generate a phase error output indicating a phase difference between a reference signal and a feedback signal generated using an output signal. The time amplifier is configured to extend the phase difference to generate an extended phase error output. The variable oscillator is configured to use one or more control signals generated by the control circuit using the extended phase error to adjust a frequency of the output signal. The control circuit may generate a proportional control signal using a switched-resistor circuit that includes a pull-up resistor and a pull-down resistor. The control circuit may generate an integral control signal using a capacitive-shared-integration circuit that includes passive integrating components.

A fouling state detection circuit (10) that detects a fouling state of a first substrate of a power supply unit includes a first voltage divider circuit (22) that outputs a first divided voltage (V1) to a first node (N11). The first voltage division circuit (22) includes a first resistance circuit (24) connected between the first power supply terminal (18) and the first node (N11), and a first resistance element (R1) connected between the first node (N11) and the second power supply terminal (20). The first resistance circuit (24) includes a plurality of second wiring patterns (WP1-WP4) formed on the second substrate (11), and a plurality of second resistance elements (RA1-RA4) having mutually different resistance values. The plurality of second wiring patterns (WP1-WP4) have wiring widths that differ from each other and that are equal to or less than the wiring width of the first wiring pattern formed on the first substrate. The plurality of second resistance elements (RA1-RA4) are connected in series with the plurality of second wiring patterns (WP1-WP4), respectively, between the first power supply terminal (18) and the first node (N11). A fouling state detection circuit (10) detects a fouling state of the first wiring pattern on the basis of the first divided voltage (V1).

Power semiconductor-device test apparatuses carrying out gate-signal controlled on / off switching of high-amp test current for various forms of device lifespan testing. Fork plugs or like connectors are insertable through openings of choice in walls partitioning the test apparatus interior for connection, in lieu of altering of wire-line changes, to switch circuits of choice, facilitating test-type connection changing. Sample-connection circuits, removable by means of connectors, include gate-driver, variable-resistor, constant-current, and voltage-output circuits, and via the gate driver circuits generate gate signals, adjustable via the variable-resistor circuits, shorting-circuit on / off applied to the gate terminals of devices under test. The constant-current circuit feeds a diode across the non-gate terminals of a device under test. A control circuit varies current, gate, and output voltages to set the test conditions so that device-under-test temperature will be a predetermined value.

A power supply device includes a DC-DC converter and a ripple generator. The DC-DC converter includes: a first switch connected between an input node and a first switching node, and a second switch connected between a reference node supplying a reference voltage and the first switching node. The DC-DC converter is configured to output an output voltage adjusting the input voltage by switching operation of each of the first switch and the second switch, to an output node. The ripple generator includes a first capacitor connected to the output node, a first resistive circuit connected between the first capacitor and a second switching node, a first ripple switch connected between the second switching node and the input node, a second ripple switch connected between the second switching node and the reference node, and a third ripple switch connected between the second switching node and the output node.

The invention provides a coupling state detection device and a detection method thereof. The control circuit controls the switching circuit to switch and connect the output end of the transmitting end to the resistance circuit or the voltage pulse generation circuit, and controls the voltage pulse generation circuit to generate voltage pulses. When the switching circuit is connected to the resistance circuit and the switching circuit is connected to the voltage pulse generating circuit, the detection circuit detects the output voltage of the transmitting end to generate a detection signal, and the coupling state between the transmitting end and the receiving end is judged.

The invention relates to a residual load of an acoustic resonator. Novel tools and techniques are provided for implementing a filter circuit array, and more particularly, methods, systems, and apparatus are provided for implementing a filter circuit array in a semiconductor package or chip package. In an embodiment, a filter array may include a first filter circuit and a first resistive circuit connected to the first filter circuit. In various cases, when the first filter circuit operates, the first filter circuit is configured to transmit or receive one or more first signals and the first resistive circuit is terminated. In other cases, when the first filter circuit is not operating, the first filter circuit is configured to terminate via the first resistive circuit.

A contamination state detection circuit (10) for detecting the contamination state of a first board of a power supply unit includes a first voltage divider circuit (22) for outputting a first divided voltage (V1) to a first node (N11). The first voltage divider circuit (22) includes a first resistance circuit (24) connected between a first power supply terminal (18) and the first node (N11), and a first resistance element (R1) connected between the first node (N11) and a second power supply terminal (20). The first resistance circuit (24) includes a plurality of second wiring patterns (WP1 to WP4) formed on a second board (11), and a plurality of second resistance elements (RA1 to RA4) having mutually different resistance values. The plurality of second wiring patterns (WP1 to WP4) have mutually different wiring widths equal to or less than the wiring width of a first wiring pattern formed on the first board. The plurality of second resistance elements (RA1 to RA4) are respectively connected in series with the plurality of second wiring patterns (WP1 to WP4) between the first power supply terminal (18) and the first node (N11). The contamination state detection circuit (10) detects the contamination state of the first wiring pattern on the basis of the first divided voltage (V1).

A protective circuit that protects a semiconductor switch includes a group of terminals consisting of either one or more input terminals and two or more output terminals, or one or more output terminals and two or more input terminals, a first resistive circuit, connected to one of the terminals, comprising a resistor having a first temperature coefficient of resistance; and a second resistive circuit, connected to another one of the terminals, comprising a resistor having a second temperature coefficient of resistance different in temperature characteristics from the first temperature coefficient of resistance. The protective circuit is electrically connected to a control terminal of the semiconductor switch, and shuts off a passing current of the semiconductor switch when a temperature of the semiconductor switch is equal to or higher than a current shut-off temperature.

The invention relates to a tobacco leaf moisture content detection system and method, a TYPE-C5V or 3.7 V lithium battery is used for supplying power, and after being powered on, the system is automatically initialized and a WiFi hotspot is created. After a hot spot is connected, the system enters a calibration mode, a zero reference is established through a short-circuit electrode clamp, and recalibration is prompted if the resistance value is abnormal. After calibration is completed, the system is switched to a measurement mode, and two options of rapid detection and continuous detection are provided. After the electrode clamp is in contact with a tobacco leaf, the constant-voltage and voltage-dividing resistance measuring circuit works, the 24-bit ADC sampling circuit performs high-precision sampling, and the microcontroller converts a resistance value into a moisture content percentage. In the rapid detection mode, measurement is completed within 1-2 seconds, and a result is displayed; in the continuous detection mode, data are displayed in real time and trend analysis is carried out. All the modules work cooperatively, it is ensured that the detection process is non-destructive, high in precision and intelligent, and an efficient solution is provided for tobacco leaf moisture content detection.

The invention relates to the technical field of analog switches, in particular to a novel analog switch for high-precision switched capacitor application, which comprises a main path circuit, an auxiliary path circuit and a holding capacitor, the auxiliary path and the main path are connected in parallel, the parallel input end serves as the input end of the novel analog switch for the high-precision switched capacitor application, and the parallel output end is grounded through the holding capacitor and serves as the output end of the novel analog switch for the high-precision switched capacitor application. Wherein the auxiliary path circuit adopts an equivalent resistor of a T-type pseudo resistance circuit. The novel analog switch for the high-precision switched capacitor application has the advantages of being simple in structure, small in error, high in turn-off resistance, high in linearity and high in stability.

An electronic keyboard module (100), comprising: a keyboard mount (110); a keyboard (120) which is arranged on the keyboard bracket (110) and includes the following: a large number of keys (122); and a plurality of key height limiting posts (124) arranged one-to-one on the lower surfaces (122s) of the keys (122); a conductive film (140) located under the keyboard (120) and comprising the following: an insulating layer (142) under the key height limit posts (124); and a plurality of conductive areas (144) spaced apart from one another on the insulating layer (142) and arranged one-to-one under the keys (122), the insulating layer (142) being located between the key height limit posts (124) and the conductive areas (144); and a force-sensing resistance circuit board (160) arranged under the conductive film (140), wherein the conductive film (140) is located between the keyboard (120) and the force-sensing resistance circuit board (160), the force-sensing resistance circuit board (160) comprising: a plurality of electrode units (162) arranged one-to-one under the conductive areas (144) of the conductive film (140); wherein, when at least one of the keys (122) is in a pressed state, the key height limiting posts (124) under at least one of the keys (122) touch the conductive foil (140), whereby the conductive areas (144) corresponding to at least one of the keys (122) can touch the corresponding electrode units (162) and be electrically connected to them.

A signal processing circuit is provided that includes a capacitor coupled to a signal line to be coupled to a sensor, and coupled in series with the sensor, and a variable resistance circuit coupled in parallel with the capacitor. The variable resistance circuit and the capacitor form a high-pass filter that allows a signal having a cutoff frequency or higher to pass through the high-pass filter. In the variable resistance circuit, a resistance value is set to a first resistance value when a target signal having a peak component on a time axis is allowed to pass through the high-pass filter, and the cutoff frequency at the first resistance value is 1 / 10 or less of a frequency of the peak component.

A wireless power transfer (WPT) system for charging an electric vehicle is disclosed. The system includes a WPT coil, a positioning system, and control circuitry. The positioning system includes a positioning coil connected to a switch, wherein in a first switch state the switch is configured to connect the positioning coil to resistor circuitry, and in a second switch state the switch is configured to disconnect the positioning coil from the resistor circuitry. The control circuitry is configured to set the switch to the first switch state to connect the positioning coil to the resistor circuitry, activate the WPT coil to induce a voltage in the positioning coil, receive a measurement from the positioning coil, and determine a relative position between a vehicle assembly and a ground assembly of the WPT system based on the received measurement from the positioning coil.

A digital-to-analog converter (DAC) and an operation method thereof are provided. The DAC includes a first operational amplifier (OPA), a second OPA, a resistor circuit, first switches, second switches, a first voltage shift circuit and a second voltage shift circuit. The first OPA outputs a first operating voltage. The second OPA outputs a second operating voltage. First terminals of the first switches receive the first operating voltage. First terminals of the second switches receive the second operating voltage. Second terminals of the first switches and the second switches are coupled to the resistor circuit. The first switches and the second switches perform switching operations in response to digital values. The first voltage shift circuit provides a first compensation voltage to the first OPA. The second voltage shift circuit provides a second compensation voltage to the second OPA.

The utility model discloses an electrical cabinet with a heat dissipation function, and relates to the technical field of power electronics, and the electrical cabinet comprises an electrical cabinet main body which is provided with an air outlet; an electrical cabinet with a heat dissipation function comprises an NTC resistance circuit, a temperature control circuit, an operational amplifier and a terminal strip. The output end of the NTC resistance circuit, the input end of the temperature control circuit and the inverted input end of the operational amplifier are connected. The output end of the temperature control circuit is connected with the output end of the operational amplifier. Through a specific circuit structure, the temperature control switch and the thermistor serve as the core, heat dissipation work of the electrical cabinet is regulated and controlled in time according to the temperature condition, energy consumption is effectively reduced on the premise that the heat dissipation effect is guaranteed, and the actual requirement is met.

An electronic keyboard module includes a keyboard bracket, a keyboard, a conductive film and a force sensing resistor circuit board. The keyboard includes plural keys and key height-limited posts disposed on lower surfaces of the keys. The conductive film includes an insulation layer and plural conductive regions. The conductive regions are spaced apart from each other and disposed on the insulation layer, and the insulation layer is located between the key height-limited posts and the conductive regions. The force sensing resistor circuit board includes plural electrode units disposed under the conductive regions. The conductive film is located between the keyboard and the force sensing resistor circuit board. When at least one of the keys is under a pressed state, the key height-limited post presses the conductive film, so that the conductive region corresponding to the key touches and is electrically connected to the electrode unit.

The invention provides a power-on reset circuit, a chip and an electronic product, and the circuit comprises a current mirror circuit which is provided with an input end and an output end; the biasing circuit comprises a first branch circuit, a second branch circuit and a resistance circuit, the first end of the first branch circuit is coupled to the input end of the current mirror circuit, the first end of the second branch circuit is coupled to the output end of the current mirror circuit, and the resistance circuit is coupled to the second end of the first branch circuit and the second end of the second branch circuit; and the driving circuit is provided with an input end coupled to the output end of the current mirror circuit and an output end for providing a power-on reset signal. The power-on reset circuit, the chip and the electronic product are simple in structure, high in anti-interference capability, low in power consumption and small in layout area.