138results about How to "Reduced DC power consumption" patented technology

A two stage power amplifier circuit that employs both a DC to DC converter and sliding bias controller to improve power amplifier efficiency. The control signal that is generated by the power detector circuit to control the input voltage to the DC to DC converter is also used to provide the reference voltage that controls the sliding bias controller. The sliding bias controller reduces the quiescent current of the power amplifiers by reducing the bias currents, and thus the DC voltage at lower power output levels driving the power amplifiers. This causes the power amplifiers to operate at or near higher efficiency Class B operation at lower power output levels. As the power level increases, the sliding bias controller reduces its control on the bias currents so that the power amplifier can be driven at necessary higher power output levels.

DC power savings in a mobile communication device can be achieved by dynamically adjusting the biasing for a receiver based on the communication link quality. The output signal levels of at least one low noise amplifier (LNA) are monitored to identify the DC operating conditions for the LNA. Closed loop control of the DC biasing is adjusted based on a comparison between the monitored DC operating conditions and a reference signal. The output of the LNA is also coupled to a radio receiver section that is configured (e.g., SW or HW) to evaluate the link quality based on various criteria such as inter-modulation distortion, noise, interference, fading, etc. The reference signal that is used to control the DC biasing of the LNA is adjusted (periodically, continuously, or on demand) in response to the evaluated link quality. The dynamic biasing yields acceptable signal reception with low DC power consumption.

The invention discloses a cantilever beam frequency detector and a cantilever beam frequency detection method based on micromechanical gallium arsenide. The frequency detector comprises a power divider (PD), a phase shifter (PS), a low pass filter (F) and a gallium arsenide metal semiconductor field effect transistor (MESFET), wherein the PD is used for receiving a microwave signal to be detected and dividing the microwave signal to be detected into two branch signals with the same amplitude and phase. The detection method comprises the following steps that: when a pull-down electrode (8) is loaded with direct current (DC) offset and a cantilever beam (6) is pulled down and contacted with a gate (4), the gate (4) is loaded with the two paths of microwave signals simultaneously, so that the magnitude of saturation current between a source (2) and a drain (3) is changed; and through a capacitor and a filter, the frequency is measured by detecting the magnitude of the saturation current between the source (2) and the drain (3). By the detector and the method, DC power consumption is low, and the frequency is easy to measure.

Circuits and methods are provided for use in a wireline or wireless transmitter to complement the digital generation of non-constant envelope modulation signals therein. A digital signal processor is configured for deconstructing a predetermined signal having an undesirable property into one or more fragment signals which do not have the undesirable property. In a preferred embodiment the predetermined signal is preconditioned by applying a preconditioning deconstruction process to another signal from which the predetermined signal is derived, whereby that other signal is deconstructed into one or more preconditioned fragment signals having an improved property over the other signal. For OFDM modulation schemes this undesirable property may be a relatively high peak-to-average power ratio. Signals formed from the fragment signals are subject to conversion to analog signals and processing by power efficient, dynamic-range limited analog circuits i.e. S Class power amplifiers (and, for wireless applications, low compression-point up-converters), before being recombined for transmission.

The invention relates to a production process for the aluminum electrolytic industry, in particular to an energy balance controlling way for aluminum electrolytic tanks, which comprises a tank controller and an up-level unit. The process comprises: 1) the adjusting of the operation voltage of the tank; 2) the adjusting of the concentration or addition volume of aluminum fluoride. The benefits with the invention are: 1. that the balance controlling of the energy for the pre-baked aluminum electrolytic tank is efficiently controlled; 2. that the controlling accuracy of plus or minus 5 Celsius system for the electrolyte temperature, the primary crystal temperature of the electrolyte and the overheat rate is up to 80% above; 3. that the average thickness of the side furnace ledge of the aluminum electrolytic tank is 120 swung dash 150 mm, a regular structure in the inside of the furnace chamber is formed; 4. that the operation voltage of the aluminum electrolytic tank is controlled to be 4.04 swung dash 4.06V, the average voltage drop for the cathode is 390 mV, and the DC consumption reduces 50kWh/t is multiplied by Al. The invention is applicable for energy-balancing control for pre-baked aluminum electrolytic tanks.

A multiple power mode amplifier provides a low and a high power mode without using switches. This amplifier may be used in RF applications such as mobile telephones. In the low power mode, the power consumption of the amplifier is reduced, which will increase operation time, especially important for battery-operated devices. In one implementation, the amplifier includes a number of impedance matching network units, impedance transformer, and a power stage.

The invention belongs to the technical field of integrated circuits of radiofrequency frequency synthesizers, and particularly relates to a low power consumption injection locked frequency tripler. A circuit comprises a harmonic wave generator and an injection locked oscillator. The harmonic wave generator is formed by a pair of NMOS tubes and is arranged in a weak inversion area in a bias mode, and triple frequency harmonic signals 3f0 with the maximum efficiency are generated by inputting fundamental frequency signals f0. The injection locked oscillator is composed of a pair of cross-coupled transistors, an inductor, a variable capacitor, a digital control capacitor array and an adjustable current source, and the working frequency of the injection locked oscillator is near the 3f0. In a free oscillation mode, the grid electrodes of the NMOS tubes have no input signals, bias currents of the injection locked oscillator are supplied by the adjustable current source, and self-oscillation frequency is output; in an injection locked mode, the grid electrodes of the NMOS tubes have fundamental frequency signals with frequency near the f0, an injection locked frequency tripler circuit is made to be locked at the frequency 3 f0, and the power consumption of the direct currents at the moment is extremely low. The power source voltages of the circuit are 0.8V, and the power consumption of the direct currents is only 0.16mW.

A buffer circuit having enhanced overvoltage protection includes core buffer circuitry couplable to a first voltage source having a first voltage level. The core buffer circuitry is configured to receive a first signal and to generate a second signal which is a function of the first signal. The buffer circuit further includes a protection circuit coupled between the core buffer circuitry and a signal pad. The protection circuit is operative: (i) to clamp the first signal to about the first voltage level when a third signal received at the signal pad exceeds the first voltage level by a first amount; and (ii) to generate the first signal being substantially equal to the third signal when the third signal is less than or substantially equal to the first voltage level.

The present invention relates to a process for preparing ozone through a low pressure electrolytic method. In an electrolytic tank of diaphragm type or non-diaphragm type, a neutral or acidic electrolysing solution is added, a non-corrodible steel electrode, a nickel alloy electrode, a lead alloy electrode or a graphitic electrode is selected as the cathode, a fluorine-containing lead dioxide electrode is selected as the anode, an electric current density of 100-2000 A/m2 and a tank voltage of 3.0-6.0 V are adopted, and the temperature of the electrolysing solution is controlled at 5-35 DEG C, then ozone is obtained after energization for an electroanalysis. The substrate of said fluorine-containing lead dioxide electrode is titanium, graphite or ceramics. Said ozone generating device for preparing ozone in accordance with the present invention is characterized by its simple structure, convenient operations, superior performances, capability of operations at normal temperature and pressure, low energy consumption, high ozone concentration generated, and avoidance to generate oxynitrides harmful to persons and entironment during electrolysises, and then is a green environmental protection equipment. According to actual needs, said method is capable of being extensively used for generating ozone in fields such as disinfection, sterilization, odor treatment, fresh-keeping, air purification, preparation of pure water, wastewater treatment, organic synthesis and the like.

A domino read bit line structure (20) integral to an SRAM array (1, 2) with thirty-two word lines or less to access SRAM cells divided into two groups (3, 4, 90, 100) is described. The bit line structure (20) includes a dynamic bit decode multiplexer (11, 40) and two NAND circuits (5, 80) used to combine the two groups (3, 4, 90, 100), wherein in order to reduce power consumption the two NANDS (80) drive the dynamic bit decode multiplexer (40) directly, such that true and complement dynamic outputs (rt, rc) drive a set-reset latch (50) to convert the dynamic outputs (rt, rc) to a single static signal (doc), wherein the output of the set-reset latch (50) is already static so that the set-reset latch (50) acts as an effective array output latch (7).

Tunable microwave magnetic devices that provide increased performance with reduced size, weight, and cost. The disclosed microwave magnetic devices are voltage-tunable devices that include ferrite substrates. To tune the devices, the magnetic permeability of the respective ferrite substrates is varied by external, voltage-tuned, magnetic fringe fields created by one or more magnetoelectric (ME) transducers.

The invention discloses a light emitter, which comprises a current mode logic driving module, a modulator and a terminating module, the current mode logic driving module is connected with the input end of the modulator in a direct coupling mode, and the current mode logic driving module is used for generating and outputting a high-speed differential driving signal; the output end of the modulatoris connected with the input end of the terminating module in a direct coupling mode; the modulator is used for modulating an optical signal of the modulator according to the received high-speed differential driving signal to obtain a modulated optical signal and outputting the modulated optical signal; and the terminating module is used for performing far-end impedance matching on the received high-speed differential driving signal. The light emitter has the advantages of saving hardware cost, reducing direct current power consumption, reducing circuit design complexity and facilitating high-density multi-channel integrated design.

The invention relates to a horizontal movement type continuous electrolytic method of lead in a regenerative lead-containing material and the method uses the lead-containing paste in waste lead acid storage batteries and the lead-containing paste generated in the production process of the lead acid storage batteries as raw material to perform electrolytic regeneration. In the electrolytic process, alkaline electrolyte is used, a cathode and an anode are arranged in a horizontal manner, the lead-containing paste to be treated is filled in a cathode disk to perform continuous horizontal movements; and the lead-containing paste is reduced to obtain lead and realize the continuous electrolytic regeneration of lead. The invention also provides a horizontal movement type continuous electrolytic device of lead in the regenerative lead-containing material. By adopting the method and device of the invention, the continuous production can be realized, the gas lock effect can be avoided or greatly reduced, the current distribution of the cathode and the anode can be improved, the cell voltage can be improved and the production efficiency can be effectively increased.

The invention discloses a system and method for adjusting multi-level power supply voltage of a power amplifier based on transmitter branch gain setting. The system comprises a radio frequency transceiver, a step-up/step-down DC-DC converter, a radio frequency predistorter and a power amplifier, wherein the radio frequency transceiver sends an analog voltage signal to the step-up/step-down DC-DC converter so as to control the step-up/step-down DC-DC converter to output a corresponding power supply voltage value to the power amplifier; the radio frequency transceiver sends a radio frequency excitation signal to the radio frequency predistorter; a processed radio frequency pre-distortion signal is sent to the input end of the power amplifier by the radio frequency pre-distorter; the power amplifier amplifies a received radio frequency pre-distortion signal, one part of a generated radio frequency amplification signal is sent to an antenna through a duplexer to be transmitted, and the other small part of the generated radio frequency amplification signal is fed back to the radio frequency pr-distorter through a coupler and also fed back to the input end of the radio frequency transceiver at the same time.

The new RTD-HBT differential oscillator circuit topology is proposed. At the nodes of the inductors and varactors in the conventional differential oscillator topology, each the RTD is attached to increase the magnitude of the negative conductance, which results in performance improvement in both the RF output power and phase noise. And, the differential sinusoidal voltage waveform which is essential for the wireless communication system are generated. In addition, the DC power consumption RTD-HBT differential oscillator circuit is similar to the conventional HBT differential oscillator due to the small DC power consumption performance of the RTD.

The embodiment of the invention discloses a shift register unit and a driving method thereof, a gate driving circuit and a display device. The shift register unit includes: an input circuit configuredto output an input signal from an input signal terminal to the pull-up node; an output circuit configured to output a clock signal from a clock signal end to an output signal end under the potentialcontrol of the pull-up node; a reset noise reduction circuit configured to perform reset and noise reduction on the pull-up node and the output signal end under the control of the potential of the pull-down node; and a pull-down node control circuit connected to the first voltage end and the pull-down node, and configured to electrically connect the pull-down node with the first voltage end underthe potential control of the pull-down node.

A negative voltage level converting circuit inhibiting a DC path comprises five P channel metal-oxide semiconductor field effect transistors P6, P7, P8, P9 and P10, and five N channel metal-oxide semiconductor field effect transistors N6, N7, N8, N9 and N10; the circuit converts a 0V-digit circuit power supply voltage into 0V-simulation circuit power supply voltage, then converts the 0V-simulation circuit power supply voltage into negative voltage power supply voltage Vneg-simulation circuit power supply voltage, thus solving uncertainty problems of each node work state of the level converting circuit because of uncertainty of the Vneg; the negative voltage level converting circuit can inhibit the digit circuit power supply-negative voltage power supply DC path caused by PN junction positive conduction when the Vneg is uncertain, thus ensuring normal working of the level converting circuit.