94results about How to "Reduce output capacitance" patented technology

Method for setup of parameter values in a RF power amplifier circuit arrangement (200), wherein the amplifier circuit arrangement (200) comprises a first (210) and a second (220) amplification branch and is operated in an out-phasing configuration for amplification of RF input signals with modulated amplitude and modulated phase and respective circuit arrangements are disclosed. According to a first aspect a re-optimization of the dead-time or conversely the duty-cycle, respectively, the phase of the output signal after the combiner can be kept linear with respect to the out-phasing angle. Further, according to a second aspect, additionally to introduction of an optimally chosen dead-time, a non-coherent combiner (Lx, Lx*) can reduce crowbar current and switching losses due the output capacitance (Cds). Furthermore, according to a third aspect the reactive compensation can, additionally or alternatively, be controlled by operating both amplification branches at different duty-cycles.

A ferroelectric/pyroelectric sensor employs a technique for determining a charge output of a ferroelectric scene element of the sensor by measuring the hysteresis loop output of the scene element several times during a particular time frame for the same temperature. An external AC signal is applied to the ferroelectric scene element to cause the hysteresis loop output from the element to switch polarization. Charge integration circuitry, such as a combination output capacitor and operational amplifier, is employed to measure the charge from the scene element. Preferably, the ferroelectric of the scene element is made of an economical and responsive strontium bismuth tantalate, SBT, or derivative thereof, disposed directly between top and bottom electrodes. Because of the frequency characteristics of the sensor, created by the external AC signal, the element need not be thermally isolated from the silicon substrate by a traditional air bridge, which is difficult to manufacture, and instead is preferably thermally isolated by spin-on-glass, SOG. To prevent saturation of an output signal voltage of the sensor by excessive charge accumulation in an output capacitor, the sensor preferably has a reference element configured electrically in parallel with the scene element. When the voltage of the AC signal is negative the output capacitor is discharged by flowing current through the reference element thus interrogating the polarization of the reference element which is compared to and subtracted from the polarization of the scene element for each cycle. The polarization difference measured for each cycle over a set time period are summed by an integrating amplifier to produce a signal output voltage.

A semiconductor integrated circuit includes: an output pad from which an output signal is outputted; an output signal line connected with the output pad; a first pad configured to function as a ground terminal or a power supply terminal; a first wiring connected with the first pad; an output driver connected with the output pad and configured to generate the output signal; an ESD protection device connected with the output signal line and having a function to discharge surge applied to the output pad; and a first trigger MOS transistor used as a trigger device. The output driver includes: a first protection target device connected between the output signal line and the first interconnection; and a first resistance element connected between the first protection target device and the first interconnection. The first trigger MOS transistor configured to detect a voltage generated in the first resistance element by a gate of the first trigger MOS transistor and to allow the ESD protection device operate in response to the detected voltage.

In accordance with an embodiment of the present invention, a MOSFET includes at least two insulation-filled trench regions laterally spaced in a first semiconductor region to form a drift region therebetween, and at least one resistive element located along an outer periphery of each of the two insulation-filled trench regions. A ratio of a width of each of the insulation-filled trench regions to a width of the drift region is adjusted so that an output capacitance of the MOSFET is minimized.

A CMOS image sensor comprises at least one CMOS image sensor pixel unit pair which comprises a first pixel unit and a second pixel unit. Each pixel unit in the CMOS image sensor comprises a photodiode area and a drive circuit area, wherein the drive circuit area comprises output transistors. Drain electrodes of the two output transistors adjacent to the first pixel unit and the second pixel unit are connected to be a common output end. The invention further provides another CMOS image sensor, wherein the amount of effective contact holes can be reduced through an output contact hole and a power contact hole of a common output transistor of the adjacent pixel units, thereby effectively decreasing the amount of the contact holes. The structure enables pixel units with smaller dimension to be designed under the condition of unreduced technical nodes without modifying a peripheral circuit and the processing parameter, which can not increase the mask and processing cost, but reduces the output capacitance and increases the filling ratio and the optical path.

An ESD protection apparatus for an electrical device with a circuit structure having an internal terminal, which is connected to an external terminal of the electrical device via a conductive connection, has a gas-filled cavity, through which the conductive connection extends at least partly, and a reference electrode in the cavity, wherein the conductive connection is disposed such in the cavity, that when applying a potential exceeding a predetermined threshold to the external terminal, a gas discharge occurs from the conductive connection to the reference electrode.

The invention relates to the field of switch power sources and specifically relates to a PFC circuit capable of reducing output capacitance, a PFC control circuit and a switch power source in which the PFC control circuit is adopted. The PFC circuit provided in the invention comprises a PFC control chip; a feedback control circuit is integrated on the PFC control chip and is used for receiving input sampling voltage of an input detection circuit and output sampling voltage of an output detection circuit, the feedback control circuit is also used for outputting control signals for controlling a work mode of a voltage conversion circuit, the PFC control chip has a reference voltage end and is characterized by additionally comprising a waveform shaping circuit which is used for truncating a wave crest of input sampling signals, and the waveform shaping circuit is externally connected between the reference voltage end of the PFC control chip and earth. Compared with technologies of the prior art, the PFC circuit, the PFC control circuit and the switch power source are advantaged by circuit simplicity, low cost and easy-to-realize property.

The invention discloses a ripple wave suppressor circuit of a program-controlled direct-current power supply. According to the ripple wave suppressor circuit of the program-controlled direct-current power supply, an active low-pass filter and a passive filter are connected between a positive output line of the direct-current power supply and a negative output line of the direct-current power supply after a capacitor C3 is connected between the positive output line of the direct-current power supply and the negative output line of the direct-current power supply, the active low-pass filter comprises an N-channel high-power MOSFET V1, a front-stage operational amplifier N1:1 with a dynamic compensation function and a rear-stage operational amplifier N1:2 with a dynamic compensation function, and the passive filter comprises an inductor L1 and a capacitor C1. According to the ripple wave suppressor circuit of the program-controlled direct-current power supply, high-frequency and low-frequency ripple wave noise output by the power supply can be lowered, the dynamic response performance can be improved, and the output precision and the stability are improved. The front-stage and rear-stage synchronous tracking control is adopted, accurate adjustment enabling the voltage difference to be low can be achieved, and the conversion efficiency of the power supply is effectively improved. As a result, the ripple wave suppressor circuit of the program-controlled direct-current power supply has high application value in the aspect of design of high-precision program-controlled power supplies.

The present invention provides a MOSFET having a low on-state resistance and a high withstand voltage as well as a small output capacitance (C(gd), etc.). The MOSFET has a p-type base layer and a n-type source layer selectively formed on the surface of the p-type base layer. A n-type drain layer is formed in a position apart from the p-type base layer . On the surface of the region between the p-type base layer and the n-type drain layer, a n-type drift semiconductor layer and a p-type drift semiconductor layer are alternately arranged from the p-type base layer 4 to the n-type drain layer. Further, in the region between the n-type source layer and the n-type drain layer, a gate electrode is formed via a gate insulating film. With the structure, the neighboring region of the gate electrode is depleted by a built in potential between the n-type drift semiconductor layer and the p-type drift semiconductor layer or by the potential of the gate electrode, when the gate electrode, source electrode, and drain electrode are at 0 potential.

The invention discloses a radio-frequency LDMOS (Laterally Diffused Metal Oxide Semiconductor) device. A body region and an N-type light-doped drift region are arranged in a P-type epitaxial layer on a P-type substrate; a polycrystalline silicon gate and a Faraday shield layer of the LDMOS device are arranged on the surface of the epitaxial layer; the N-type drift region is divided into an upper layer and a lower layer; the concentration of the lower layer is greater than that of the upper layer; two-section P-type buried layers are arranged at a junction of the upper layer and the lower layer; and the radio-frequency LDMOS device in the structure has lower output capacitance. The invention further discloses a technological method of the radio-frequency LDMOS device.

The invention provides a schottky diode controlled by a junction barrier having a superposed P<+>-P structure. The schottky diode comprises an N<+> type substrate zone (100), an N type drift region (101), P<+> portions of the superposed P<+>-P structure (102), an anodic electrode (104), a cathodic electrode (105), a silicon dioxide layer (106), a schottky contact (107), and an ohmic contact (108). Besides, the schottky diode also includes P portions of the superposed P<+>-P structure (103), wherein the P<+> window portions of the superposed P<+>-P structure (102) is on the P window portions of the superposed P<+>-P structure (103). According to the invention, before the P<+> portions of the superposed P<+>-P structure in an area are formed, the P portions of the superposed P<+>-P structure in an area are formed, wherein the P portions are separated from each other and the structure of P portions is similar to the netted structure of a junction barrier schottky (JBS). Therefore, reverse withstand voltage of the JBS diode device can be improved and the output capacitance can be reduced, on the condition that the forward conduction characteristic of the device is not sacrificed. The process of the invention has the strong feasibility of implementation, and the application requirement of the power electronic system can be satisfied easily according to the invention.

A switching adapter control method for adaptive mobile power systems is composed of reference current generator, current mode error compensator, controllable constant turn-off timer, PWM generator and MOSFET driver. The output of the switching adapter can show constant current and voltage characteristics, that means, as the DC bus voltage is over a preset voltage, the adaptor's output characteristic is converted from a constant current source into a constant voltage source with the preset voltage. For low output capacitance case, the present invention has the ability to smoothly reduce the switching frequency of the switching adaptor and reduce the switching losses and meet Energy Star 2.0 requirements under different load conditions. And the output ripple current and voltage can be in the allowed range.

A transient voltage occurring between output terminals during ON/OFF operation is reduced. There are provided a pair of input terminals IN1 and IN2, a pair of output terminals OUT1 and OUT2, MOSFETs N1 and N2 connected between the output terminals, and a drive circuit 10 connected between the input terminals IN1 and IN2 and the MOSFETs N1 and N2. A light-emitting diode D1 is connected between the input terminals IN1 and IN2. The MOSFETs N1 and N2 have their source electrodes electrically connected to each other and their drains connected to the output terminals OUT1 and OUT2 respectively. The drive circuit 10 includes a photodiode array FD1 that supplies a drive voltage to the gates of the MOSFETs N1 and N2, and a discharge circuit 11, connected between the gate electrodes and the source electrodes of the MOSFETs N1 and N2, that discharges electric charges accumulated on each gate electrode. (FIG. 1)

In a control device and a method for operating a safety system for a vehicle, a step-up converter is fashioned as a switching converter which converts an input voltage derived from a vehicle battery voltage into a higher charge voltage at its output. In addition, at least one energy reserve storage device is provided that is charged by the charge voltage for the operation of the safety system in an autarkic mode. Between the step-up converter and the at least one energy reserve storage device there is connected a charge current source that is programmable during operation and that defines a charge current for the at least one energy reserve storage device as a function of its programming.

Multi-bit input data is divided into at least a first bit group and a second bit group, and each of first sub-decode circuits selects one selection target signal/voltage from selection target signal/voltage group in accordance with the first bit group. Then, one signal/voltage is selected according to the second bit group from the signals/voltages selected by the first sub-decode circuits, and is transmitted to an output signal line. Each of second sub-decode circuits is formed of a single train of series switches, and only one of the switch train is made conductive to transmit a finally selected signal/voltage to the output signal line.