1931 results about "Load resistance" patented technology

Resistive touchscreen system has substrate and coversheet with first and second conductive coatings. The substrate and coversheet are positioned proximate each other such that the first conductive coating faces the second conductive coating. The substrate and coversheet are electrically disconnected with respect to each other in the absence of a touch. First set of electrodes is formed on the substrate for establishing voltage gradients in first direction. Second set of electrodes is formed on the coversheet for establishing voltage gradients in second direction wherein the first and second directions are different. Controller biases the first and second sets of electrodes in first and second cycles and senses a bias load resistance associated with at least one of the sets of electrodes. The bias load resistance has a reference value associated with no touch. A decrease in the bias load resistance relative to the reference value indicates two simultaneous touches.

A disk drive is disclosed including a disk, a head coupled to a distal end of an actuator arm, and a voice coil motor (VCM) operable to rotate the actuator arm about a pivot to actuate the head radially over the disk, wherein the VCM comprises a coil. Control circuitry within the disk drive measures a load resistance of the coil prior to executing a load operation, wherein the load operation moves the actuator arm off a ramp to load the head onto the disk. The load resistance of the coil is then converted into an initial coil temperature estimate.

A preamplifier having extremely high input impedance amplifies the electrical signal output from an electret condenser microphone (ECM) without suffering from the effects of a DC leakage current at the input. The preamplifier circuit includes a pair of cross-coupled PN junction diodes setting the input impedance, a PMOS device, and a load resistor configured similarly to a conventional preamplifier. A capacitor is placed between the input and the cross-coupled diodes such that a DC path no longer exists to bias the cross-coupled diodes. Therefore, leakage currents are prevented from upsetting the DC operating point of the preamplifier and biasing the cross-coupled diodes. Consequently, small signal gain distortion, excessive demodulation products and increased noise can be avoided.

A baseband signal converter device for an impulse radio receiver combines multiple converter circuits and an RF amplifier in a single integrated circuit package. Each converter circuit includes an integrator circuit that integrates a portion of each RF pulse during a sampling period triggered by a timing pulse generator. The integrator capacitor is isolated by a pair of Schottky diodes connected to a pair of load resistors. A current equalizer circuit equalizes the current flowing through the load resistors when the integrator is not sampling. Current steering logic transfers load current between the diodes and a constant bias circuit depending on whether a sampling pulse is present.

A nonvolatile semiconductor device is configured so that a load circuit applying voltage to a variable resistive element is provided electrically connecting in series to the variable resistive element, a load resistive characteristic of the load circuit can be switched between two different characteristics. The two load resistive characteristics are selectively switched depending on whether a resistive characteristic of the variable resistive element transits from low resistance state to high resistance state, or vice versa, voltage necessary for transition from one of the two resistive characteristics to the other is applied by applying writing voltage to a serial circuit of the variable resistive element and load circuit. After the resistive characteristic of the variable resistive element transits from one to the other, voltage applied to the variable resistive element does not allow a resistive characteristic to return from the other to one depending on the selected load resistive characteristic.

A low-voltage differential signaling (LVDS) output buffer has an improved eye pattern. The LVDS buffer has two parallel stages. A primary stage generates enough current to generate a first voltage drop across a load resistor. At higher frequencies, parasitic capacitive coupling reduces this first voltage drop, closing the eye pattern. A boost stage generates an additional boost current through the load resistor, adding to the voltage drop and opening the eye pattern. The boost stage is coupled to the outputs by link transistors that are enabled by a pre-emphasis signal generated by resetable pulse generators. When outputs switch, the pre-emphasis signal pulses the link transistors on, adding the boost current. At high frequencies, the pulse generators are reset before the pre-emphasis signal ends. The boost current is continuously added at high frequencies, but at low frequencies the boost current only occurs during the pre-emphasis period after outputs switch.

In a variable gain amplifier controlling a gain by using differential amplifiers with a gain control signal, a gain switchover differential amplifier or a bias circuit which composes a current mirror with the gain switchover differential amplifier is connected between a high and a low gain differential amplifier for the same bias current which are mutually connected to share load resistances for the same output polarity and a bias current source common to both of the differential amplifiers, to perform switchover operations of the high and the low differential amplifier by a gain control signal, and a current source which flows a fixed offset current through at least the low one of the high and the low differential amplifier is provided.

An amplifying circuit includes: an amplifying cell portion configured by cascade-connecting a plurality stage of amplifying cells each including a pair of N-type transistors differentially connected to each other, load resistors and a current source for generating an operating current, and each having a function of amplifying differential signals; a feedback portion configured to feed differential output signals from the amplifying cell in a rear stage side of the amplifying cell portion back to differential input terminals of the amplifying cell on a front stage side; and an input portion configured to supply differential input signals to input terminals in a first stage of the amplifying cell portion.

In a WPT system, varying parameters, such as coupling coefficient, may cause the system to fall out of resonance and / or tuning. By monitoring one or more signals within a coil module of the WPT device, this detuning can be detected. Moreover, the WPT system can retune itself by modifying one or more parameters in a transmitting WPT device and / or a receiving WPT device. For example, coil circuits in the transmitting and / or receiving WPT devices can be configured to allow for adjusting of effective capacitance, effective inductance, load resistance, and / or load inductance. In addition, frequency can be modified to permit adjusting power transfer efficiency.

A frequency divider involves a plurality of Injection-locked Ring Oscillators (ILRO). A first ILRO includes a pair of cross-coupled N-channel transistors, a pair of load resistors, an integrating capacitor, and a current injection circuit. The drain of each transistor is coupled to the gate of the other transistor. Each load resistor couples the drain of each transistor to a circuit voltage source. The integrating capacitor couples the sources of each transistor. The current injection circuit alternately opens and closes a path from the source of each transistor to circuit ground in response to an oscillatory input signal of a first frequency. In response, the voltage state at the drain of each transistor is alternately latched and toggled, generating a differential pair of oscillating signals frequency divided by two. A first and second ILRO driven in antiphase generate two differential output signals in phase quadrature.

It is a problem to provide a light-emitting device capable of obtaining a constant brightness without being affected by deterioration in an organic light-emitting layer or temperature change, and of making desired color display. The lowering in OLED brightness due to deterioration is reduced by causing the OLED to emit light while keeping constant the current flowing through the OLED instead of causing the OLED to emit light while keeping constant the OLED drive voltage. Namely, OLED brightness is controlled not by voltage but by current thereby preventing against the change in OLED brightness due to deterioration of OLED. Specifically, the drain current Id of a transistor for supplying a current to the OLED is controlled in a signal line drive circuit thereby keeping constant the drain current Id without relying upon the value of a load resistance.

A phase locked loop (PLL) can include a test loop filter (100) that generates a control voltage (VCTRL) for input to a voltage controlled oscillator (VCO). In a test mode, a control voltage can be varied and resulting output frequencies recorded, from which an open loop bandwidth can be determined. A control voltage can be varied by enabling a switch element (104-1) that can provide a current path through load resistance (RL) of test loop filter (100). Current provided to the test loop filter can be varied according to test signals to provide a variable control voltage (VCTRL).

The invention aims at modifying SPUDT-type surface acoustic wave filters in such a way that the wideband filter can be produced with lower insertion loss and a small form factor without substantially enlarging layout. According to the invention, this is achieved by combining the following characteristics: a) the totality of fingers (231-233; 331-333) of each transducer (2; 3) forms a tapering structure and b) the widths and the positions of the fingers are chosen in such a way that the waves reflected on the fingers (231-233; 331-333) together with the waves regenerated by the corresponding source and load resistance (8; 9) result in an lengthening of the impulse response of the filter, which reduces form factor and / or bandwidth. The invention can be used in surface acoustic wave-based components such as wideband bandpass filters and delay lines.

A bandgap reference circuit includes a current generation circuit connected to a voltage generation circuit connected to a smart clamping circuit, and a discharge circuit connected to the current generation circuit and the voltage generation circuit. The discharge circuit initially discharges a potential in the current and voltage generation circuits to improve repeatability. A start circuit within the current generation circuit then initializes the reference output at about the supply voltage to improve the speed and settling time of the output signal. The current generation circuit sources a current to the voltage generation circuit that translates the current having a positive function of temperature +TC into a reference voltage. The smart clamping circuit further generates a clamping voltage having a negative function of temperature −TC and a load resistance. The clamping voltage and the load resistance are applied across the reference voltage quickly reducing the reference voltage particularly at high temperatures and during start-up to a final level, thereby producing a fast and stable reference voltage.

Systems for tuning a wireless power transfer system are provided, which may include any number of features. In one embodiment, a wireless power transfer system can include a transmit controller connected to the transmitter resonator and configured to measure an impedance on the transmitter resonator. The transmit controller can be configured to determine a load resistance of the receiver resonator and a coupling coefficient between the transmitter and receiver resonators based on the measured impedance on the transmitter resonator. The transmit controller can be further configured to adjust a power transmission parameter of the transmitter resonator based on the determined load resistance and the coupling coefficient to achieve a controlled voltage at a load of the receiver. Methods of use are also provided.

It is a problem to provide a light-emitting device capable of obtaining a constant brightness without being affected by deterioration in an organic light-emitting layer or temperature change, and of making desired color display. The lowering in OLED brightness due to deterioration is reduced by causing the OLED to emit light while keeping constant the current flowing through the OLED instead of causing the OLED to emit light while keeping constant the OLED drive voltage. Namely, OLED brightness is controlled not by voltage but by current thereby preventing against the change in OLED brightness due to deterioration of OLED. Specifically, the drain current Id of a transistor for supplying a current to the OLED is controlled in a signal line drive circuit thereby keeping constant the drain current Id without relying upon the value of a load resistance.

A nonvolatile semiconductor memory device comprises: a two terminal structured variable resistive element, wherein resistive characteristics defined by current-voltage characteristics at both ends transit between low and high resistance states stably by applying a voltage satisfying predetermined conditions to the both ends, a transition from the low resistance state to the high resistance state occurs by applying a voltage of a first polarity whose absolute value is at or higher than a first threshold voltage, and the reverse transition occurs by applying a voltage of a second polarity whose absolute value is at or higher than a second threshold voltage; a load circuit connected to the variable resistive element in series having an adjustable load resistance; and a voltage generation circuit for applying a voltage to both ends of a serial circuit; wherein the variable resistive element can transit between the states by adjusting a resistance of the load circuit.

The invention relates to a coal chemical wastewater treatment method, in particular to a chemical wastewater treatment method. The invention aims to solve the problems of the chemical wastewater treatment method such as bad outlet water quality and high operational cost. The method comprises the following steps: pretreating coal chemical wastewater to be treated; then carrying out hydrolytic acidification treatment, external circulating anaerobic treatment, anaerobic sedimentation treatment, adjusting hydrolytic acidification treatment, contact oxidation treatment, sedimentation treatment, A / O treatment, sedimentation treatment, deamination treatment, coagulating sedimentation treatment and aeration biological filter tank treatment, wherein the temperature in an external circulating anaerobic tank is controlled within the scope of 32 to 35 DEG C; the hydraulic detention time is 24 to 36 h; the sludge concentration is controlled between 50 and 100 g / L; the volume load is 5 to 10 kg COD / m.d ; and the pH value is controlled between 7.0 and 7.5. The invention has the advantages of flexible operation, impact load resistance, low operating cost and good treatment effect; after the coal chemical wastewater is treated by the treatment method, the outlet water quality completely can achieve the wastewater comprehensive discharge standard regulated by the State.

A loop impedance meter is provided for testing an A.C. electrical mains supply. The meter comprises an electronic control circuit for connecting a load resistance intermittently between the A.C. mains supply terminal and the earth terminal to measure the potential difference between those terminals and to provide an indication of the loop impedance of the A.C. mains supply from that potential difference. The control circuit is arranged to allow a train of short pulses of current to flow through the load resistance and the loop, the pulse train beginning its sequence with a first train of pulses for preconditioning any residual current device-present in the loop to temporarily desensitize it. The first train of pulses is followed by one or more measurement pulses, the pulses of the first train being of generally increasing width.

The present invention relates to test table for driving motor of hybrid electric vehicle to finish capability test of driving motor of hybrid electric vehicle and debugging function of control software. The table system has simple structure, convenient operation and maintains and high test precision. When the grades of motor and load voltage are identical, the system can work parallel with DC generatrix and feed back energy, the energy lose is less, the power supply need to provide system loss energy is about 10% to 20%, the cost is reduced greatly and the requirement of capacity of power supply is little. When the grades of motor and load voltage aren't identical, two complexions are happened, when motor is as driver, energy is applied to load resistance box by dynamometer system or power supply; when the motor is as generator, the energy is applied to load resistance box by power supply.

A circuit includes input drain, source and gate nodes. The circuit also includes a group III nitride enhancement-mode HFET having a source, drain and gate and a voltage shifter having a first terminal connected to the gate of the enhancement mode HFET at a common junction. The circuit also includes a load resistive element connected to the common junction. The drain of the enhancement-mode HFET serves as the input drain node, the source of the enhancement-mode HFET serves as the input source node and a second terminal of the voltage shifter serves as the input gate node.

It is intended to achieve a sufficiently-small SRAM cell area and a stable operation margin in an E / R type 4T-SRAM comprising a vertical transistor SGT. In a static type memory cell made up using four MOS transistors and two load resistor elements, each of the MOS transistor constituting the memory cell is formed on a planar silicon layer formed on a buried oxide film, to have a structure where a drain, a gate and a source are arranged in a vertical direction, wherein the gate is formed to surround a pillar-shaped semiconductor layer, and each of the load resistor elements is made of polysilicon and formed on the planar silicon layer.

The invention discloses a locomotive car duct pilot earth detecting circuit, which comprises a positive bus-bar, a negative bus-bar, a load resistance, line-to-ground isolated resistances of the positive bus-bar and the negative bus-bar, wherein, two detecting branch circuits are connected between the positive or the negative bus-bar and the earth respectively, one of which is composed of a known resistance and the other one is composed of the known resistance and a switch board in series connection. At the same time, an earth detecting method and a thread break error detecting method are further provided to be used for the locomotive car duct pilot earth detecting circuit. The locomotive car duct pilot earth detecting circuit can not only judges the earth errors existing in the locomotive car duct pilot by detecting the size of the line-to-ground isolated resistance of the positive and the negative bus-bar, but also detects the errors of thread breaking, which overcomes the shortcomings of traditional methods, alarms the earth errors in advance, eliminates the hidden safety trouble caused by the earth errors to regular running of locomotive cars and improves the normal using efficiency of locomotive cars.

A driving integrated circuit (IC) is provided. The driving IC includes a reference voltage setup circuit configured to output a reference voltage based on a test voltage and a load current control unit comparing a load voltage output from a load resistor with the reference voltage in response to a load current and maintaining the load current constant based on a result of the comparison.

Provided is an energy harvesting electric device capable of increasing output power. The energy harvesting electric device includes an energy harvester array including a plurality of energy harvesters, a single rectifier connected to the energy harvester array, and an output unit which is connected to the single rectifier and has a load resistance. The energy harvesters include a plurality of first energy harvesters connected to each other in parallel and a single second energy harvester connected in parallel to the first energy harvesters. The first energy harvesters have a first specific resistance higher than the load resistance and the second energy harvester has a second specific resistance higher than the first specific resistance.

A display device capable of keeping the luminance constant irrespective of temperature change is provided as well as a method of driving the display device. A current mirror circuit composed of transistors is placed in each pixel. A first transistor and a second transistor of the current mirror circuit are connected such that the drain current of the first transistor is kept in proportion to the drain current of the second transistor irrespective of the load resistance value. The drain current of the first transistor is controlled by a driving circuit in accordance with a video signal and the drain current of the second transistor is caused to flow into an OLED, thereby controlling the OLED drive current and the luminance of the OLED.