57results about "Electronic switching" patented technology

In the case where high speed differential signals are transmitted in differential transmission lines through via holes with open-stubs, signal waveforms are distorted due to impedance mismatch in the open-stubs of the via holes, thus causing jitter, which has become an issue of high speed signals. For differential transmission lines that pass through via holes with open-stubs, a degree of coupling of the lines is decreased while the differential characteristic impedance is made constant. Thereby, the effects of backward cross talk noise caused by the coupling can be minimized, and thus jitter can be suppressed.

Measurement circuit components are included in an integrated circuit fabricated on a semiconductor substrate. These measurement circuits are connected to a voltage regulation circuit that provides the integrated circuit voltage source. These measurement circuits provide signals to control the voltage regulation circuit to adjust the voltage output to the integrated circuit based upon a measurement values obtained on the semiconductor device. These measurements include temperature and IR drop at locations on the semiconductor substrate, along with the frequency response of integrated circuit.

In order to transmit high-speed digital signals of several tens of GHz through differential lines, a signal transmission system for transmitting digital signals between circuit blocks via signal transmission lines is provided by connecting a ground-referenced differential line to a non-ground-referenced differential line, Each circuit block basically includes a functional circuit, a receiving/transmitting circuit formed separately from the functional circuit, and an impedance-matched transmission line (115) formed between the receiving end and the transmitting end of the receiving/transmitting circuit; reference ground (110) The differential line (105) is drawn from the differential output driver, and a differential signal line is formed symmetrically with respect to the ground (110) in the circuit block. In the signal transmission line (115), there are only differential pair lines that are not referenced to ground (111, 112) extend directly from differential signal lines arranged symmetrically with respect to ground potential.

The invention provides electronic equipment which comprises a reset circuit and a processor, wherein the processor comprises a normal operation state and a system halted state. The reset circuit comprises a keyboard module and a reset control module, and the keyboard module comprises a plurality of buttons. The processor responds to pressing of the buttons to carry out preset corresponding operation. When N preset buttons in the keyboard module are pressed at the same time, the reset control module outputs a system halted reset signal to the processor, so that the processor can be reset and restored to the normal operation state, wherein the N is a natural number which is larger than or equal to two. Compared with the prior art, the electronic equipment can achieve system halted reset control on the system through combination of the buttons, not only is cost of independently setting a system halted reset button saved, but also good user experience is brought to clients.

A resonant gate drive circuit provides efficient switching of, for example, MOSFETs. However, the operation of resonant gate drive circuits often does not allow applications where high switching frequencies are required. According to the invention, a precharging of the inductance of the resonant gate drive circuit is performed. This allows highly efficient and fast MOSFET operation.

An output circuit comprises first and second transistors, a driving circuit and a current mirror circuit. The driving circuit supplies a relatively small constant current to the base of the first transistor. When a current flows to the collector of the first transistor, a current with a magnitude set at a fixed ratio with respect to the current flows to the collector of the second transistor, and a current proportional to the current flowing to the collector of the second transistor flows to the base of the first transistor by way of the current mirror circuit. That is, a current, which is determined in accordance with a current flowing to the collector of the first transistor, flows to the base of the first transistor.

The invention relates to a charge pump which comprises a pump capacitor, a switch module, a first switch, a switching switch, an output capacitor and a wave interruption circuit, wherein the pump capacitor is used for generating pump voltage, the switch module and the first switch are respectively coupled with both ends of the pump capacitor, and the switching switch is coupled with the first switch and the pump capacitor to switch the pump capacitor to output the pump voltage. The output capacitor is coupled with the switching switch and the pump capacitor to output the pump voltage output bythe pump capacitor, and the wave interruption circuit is coupled between the pump capacitor and the output capacitor to avoid the conduction of a parasitic transistor of the switching switch so as toavoid charge loss, so that the power efficiency of the charge pump is improved, the ascending or descending time of the output voltage is reduced when started, and the reliability of a circuit underthe environment of high temperature is increased.

The invention provides a cascode transistor circuit with a depletion mode transistor and a switching device. A gate bias circuit is connected between the gate of the depletion mode transistor and the low power line. The gate bias circuit is adapted to compensate the forward voltage of a diode function of the switching device. The depletion mode transistor and the gate bias circuit are formed as part of an integrated circuit.

The invention discloses a startup and shutdown system employing remote infrared control and a computer. The startup and shutdown system employing remote infrared control comprises an infrared remote controller (1), an infrared receiver (2), a latch (3) and a power supply controller (4), wherein the infrared receiver (2) is used for receiving an infrared light emitted by the infrared remote controller (1) and generating a first low level signal; the latch (3) is connected with the infrared receiver (2) for receiving a first low level signal, latching the first low level signal and generating a latch signal; the power supply controller (4) is connected with the latch (3) to control a power supply according to the latch signal; the computer comprises a startup and shutdown system employing remote infrared control. The system utilizes remote infrared control, and is started up and shut down by a key, and a master power supply and an auxiliary power supply are powered on or off, so that the startup and shutdown system is convenient to use, and is humanized, energy consumption of the control circuit is almost zero, and the startup and shutdown system is good in energy-saving effect, and low in cost, and the circuit is simple.

The invention discloses a selector circuit with a fixed output state, relating to an integrated circuit technology. A selector comprises a transmission gate, a phase inerter and a PMOS (P-channel Metal Oxide Semiconductor) up-drawing tube. Control bits output by a control circuit are connected with the grid electrode of an NMOS (N-channel Metal Oxide Semiconductor) tube of the transmission gate and used for controlling the grid electrode of a PMOS tube of the transmission gate through the phase inverter, the grid electrode of the PMOS up-drawing tube is connected with the control bits, the source electrode of the PMOS up-drawing tube is connected with a power supply end vdd, and the drain electrode of the PMOS up-drawing tube is connected with the output end of the transmission gate. The circuit disclosed by the invention can be used for ensuring that the output end of the selector is not in an empty level state, but is drawn to the high level through the PMOS up-drawing tube when all output control bits are equal to zero, so that a static short-circuit current is prevented from being generated by a gate circuit connected with the output end; and the circuit disclosed by the invention is low in area overhead, low in requirement for parameters of the PMOS up-drawing tube, capable of reducing the amount of the control bits and eliminating the static short-circuit current, and little in influence to the performance of a chip.

The embodiment of the invention discloses an enabling control circuit of a reading circuit of an infrared focal plane array. The enabling control circuit comprises an and gate, an external control circuit, a simulation power-on and power consumption detection circuit, and a digital power-on detection circuit. The external control circuit, the simulation power-on and power consumption detection circuit and the digital power-on detection circuit are connected to three input ends of the and gate respectively, and the output end of the and gate outputs an enabling control signal. According to the enabling control circuit, the enabling control signal is jointly controlled through an external control signal, a digital power-on detection signal and a simulation power-on and power consumption detection signal, the simulation power-on and power consumption detection signal is added to an enabling control module, thus whether a simulation module is powered on or not can be detected, the situation of overhigh power consumption can be prevented on the whole, and power consumption is effectively controlled.

A first oscillation circuit in which a helical antenna is used as a part of an element for a resonance circuit and a second oscillation circuit in which a loop antenna is used as a part of an element for a resonance circuit are caused to oscillate at substantially the same frequency. When a human body approaches the helical antenna and the loop antenna, the frequency difference increases between the first oscillation circuit and the second oscillation circuit. This frequency difference is extracted using a BPF.

The invention discloses a circuit for restoring factory setting through one-key. The circuit comprises a physical key for pressing to generate a low-level signal; a restarting circuit connected with the physical key and used for performing delay restarting according to the low-level signal; and a state judgment circuit connected with the physical key and used for setting according to the low-levelsignal and judging a zone bit as low, and restoring the factory setting after the delay restarting; the problem that the operation of restoring the factory setting is tedious is solved, the equipmentrestarting and the factory setting restoration can be realized through one key, the simple degree of the operation is greatly improved, and the above function can be realized without plugging the power supply or cooperating with other keys. The circuit disclosed by the invention is used for special equipment, so that the key of the special equipment not only can realize the factory setting restoration through one key, and the key can be pressed down without additional auxiliary tool, and then the function of the tradition equipment is extended.

The invention relates to a switching noise suppression circuit integrated on an A/D (analog/digital) converter chip. The switching noise suppression circuit contains a positive reference path resistance capacitance (RC) network and a negative reference path RC network. The two RC networks are used to restrain the simultaneous switching noise (SSN) noises of the positive reference VREF+ and negative reference VREF- of an assembly line, thus the spurious free dynamic range (SFDR) of the A/D converter of a high speed high precision assembly line can be increased from 30-40dB to 80-90dB and the dynamic performance of the A/D converter of the assembly line can be greatly increased. The circuit of the invention can be widely used in the A/D converter of the high speed high precision assembly line.

A capacitive touch panel includes a first transparent substrate, a second transparent substrate, and an isolation layer. First and second sensing electrode serials are disposed on surfaces of the first and second transparent substrates, respectively. The first sensing electrode serials are formed by cascading first sensing electrodes. A first hollow region is formed between two adjacent first sensing electrodes. A first compensating electrode is formed in the first hollow region on the surface of the first transparent substrate. The second sensing electrode serials are formed by cascading second sensing electrodes. A second hollow region is formed between two adjacent second sensing electrodes. A second compensating electrode is formed in the second hollow region on the surface of the second transparent substrate. The isolation layer is disposed between the first and second transparent substrates.

A coaxial RF switch optoelectronic indicator comprising a light-emitting diode (LED), a photo sensor, and a shutter assembly wherein the shutter assembly interacts with the soft-iron rocker in the switch and causes the optical path between the LED and photo-sensor to open or close, corresponding to the states (connected or disconnected) of an RF channel in the switch, providing an indicator means to the switch.

A semiconductor device includes a pre-buffer for transferring a data signal on the basis of a first power supply voltage, a main buffer for amplifying and outputting the data signal transferred by the pre-buffer on the basis of a second power supply voltage different from the first power supply voltage, a switch unit for controlling a conductive state between the pre-buffer and the main buffer on the basis of a switch control signal, and a control circuit for generating the switch control signal for controlling the pre-buffer to set an output level of the pre-buffer to ground potential in accordance with transition of logical level of the switch control signal.

The invention relates to a touch-control-based one-key switching method and device for transparency and non-transparency of an intelligent vehicle window. The method comprises the following steps thata touch screen is clicked, a first signal is generated and transmitted to a main board, and when a touch drive board on the touch screen judges that the clicking position is the position where a one-key switching button is located, the content of the first signal is a one-key transparent signal; after receiving the first signal, the main board identifies the content of the first signal, and whenthe main board identifies that the content of the first signal is a one-key transparent signal, a corresponding second signal is generated and sent to the screen driving board; and after receiving thesecond signal, the screen driving board controls the display screen to be in a fully transparent state according to the second signal. The one-key switching button is arranged in the display area ofthe car window, when passengers need to appreciate scenery outside the car window, the one-key switching button is clicked, the display area of the car window is in a transparent state, and it is guaranteed that the passengers can clearly appreciate the scenery outside the car window on the premise that the car window is not powered off.

The present invention provides a method and system for open loop compensation of delay variations in a delay line. The method includes sensing the Process, Voltage, Temperature (PVT) variations in the delay line using a sensing circuit. A first and second sensitive current are generated based on the PVT variations. The first and second sensitive currents are mirrored currents from the sensing circuit. Then, a first compensation current is generated based on the first sensitive current and a first summing current. The first summing current is a reference current independent of the PVT variations. Further, the first compensation current is mirrored as a second summing current and a second compensation current is generated from the second sensitive current and the second summing current. The second compensation current compensates the delay variations and has a sensitivity based on the sensitivities of the first and second sensitive currents.

An electronic device generates a current with a predetermined temperature coefficient. The circuit comprises a temperature coefficient (TC) component receiving a bias current, a differential amplifier providing a buffered output voltage based on the voltage across the TC component and a resistor receiving an TC current based on the differential amplifier output voltage. The differential amplifier has a predetermined input related offset which decreases the voltage drop across the resistor. The temperature coefficient component could have either a negative temperature component (NTC) or a positive temperature component (PTC).