114results about How to "Reduced Linearity Requirements" patented technology

An antenna system installation comprising a tower / support structure, and an antenna structure mounted at the top of said tower / support structure, said antenna structure comprises a plurality of antenna elements, a plurality of power amplifiers, each power amplifier being operatively coupled with one of said antenna elements and mounted closely adjacent to the associated antenna element, such that no appreciable power loss occurs between the power amplifier and the associated antenna element, each said power amplifier comprising a relatively low power, relatively low cost per watt linear power amplifier chip, a first RF to fiber transceiver mounted at the top of said tower / support structure and operatively coupled with said antenna structure, and a second RF to fiber transceiver mounted adjacent a base portion of said tower / support structure and coupled with said first RF transceiver by an optical fiber cable.

A touch sensor integrated type display device includes gate lines and data lines disposed to cross over each other, pixel electrodes respectively disposed in areas defined by the crossing of the gate lines and the data lines in an active area, 1-1 electrodes arranged in at least two rows and at least two columns in the active area, 1-2 electrodes positioned outside the 1-1 electrodes and extending from the active area to a bezel area, and first routing wires respectively connected to the 1-1 and 1-2 electrodes and arranged in parallel. Each gate line extends from the active area to the bezel area on opposite sides of the active area, and each data line extends from the active area to the bezel area on opposite sides of the active area crossing the gate line.

The dynamic range is changed by switching a current applied to an amplifying circuit to obtain the minimum ICP required to keep linearity with the number of multiplexes even when the number of multiplexes of data is changed by switching the operation current of the amplifying circuits of the transmission system and also supplying the information about number of multiplexes of data to be transmitted to the amplifying circuits of the transmission system from the baseband circuit. Thereby, the signal can be transmitted without distortion even when the number of multiplexes increases and the current of the amplifying circuit may be reduced when the number of multiplexes is small in order to reduce the current consumption in the communication semiconductor integrated circuit device which can form a wireless communication system of the code division multiplex system such as W-CDMA system.

In a method and a pulse sequence optimization device to determine a pulse sequence for a magnetic resonance system, a pulse sequence is selected for optimization that includes a number of radio-frequency pulses and a number of gradient pulses chronologically coordinated therewith. An automatic analysis of the pulse sequence takes place to identify fixed point / time periods in the pulse sequence that are to be left unmodified, and modifiable time intervals in the pulse sequence that may be optimized. An automatic optimization of gradient pulses in the modifiable time intervals takes place according to a predetermined optimization criterion, while keeping the length of modifiable time intervals constant.

A method is provided for driving a liquid crystal display capable of preventing degradation of linearity of a gamma characteristic, of achieving display of a high quality image in a simple and low-priced configuration and of solving problems associated with environmental changes, frequency characteristic of timing signals, change in a gamma characteristic caused by luminance of a backlight, or dispersion in a gamma characteristic occurring during processes of manufacturing a color liquid crystal display. The method includes acquirement of first corrected red data, first corrected green data, and first corrected blue data each being of 10 bits to which information to change a gray scale two or more times for every red data, green data, and blue data has been added when a gamma correction is made to red, green, and blue data each being of 8 bits and generation of data red, green, and blue signals to be fed to a data electrode of a liquid crystal display to perform frame rate control.

A 3-way Doherty amplifier has an amplifier input and an amplifier output. The amplifier has a main stage, a first peak stage and a second peak stage. The amplifier has an input network connecting the amplifier input to the inputs of the stages, and an output network connecting the stages to the amplifier output. The output network implements a phase shift of 90° between the output of the main stage and the amplifier output; a phase shift of 180° between the output of the first peak stage and the amplifier output; and a phase shift of 90° between the third output and the amplifier output.

A Phase-Locked Loop (PLL) includes a Phase-to-Digital Converter (PDC), a programmable digital loop filter, a Digitally-Controlled Oscillator (DCO), and a loop divider. Within the PDC, phase information is converted into a stream of digital values by a charge pump and an Analog-to-Digital Converter (ADC). The stream of digital values is supplied to the digital loop filter which in turn supplies digital tuning words to the DCO. A number of types of ADCs can be used for the ADC including a continuous-time delta-sigma oversampling Digital ADC and a Successive Approximation ADC. The voltage signal on the charge pump output is a small amplitude midrange voltage signal. The small voltage amplitude of the signal leads to numerous advantages including improved charge pump linearity, reduced charge pump noise, and lower supply voltage operation of the overall PLL.

The present invention provides the method and system of a Time Division Multiplexing which makes use of a number of symbols in the time domain transmitting data sequence in parallel. The method includes: the transmitting terminal forms the transmission signals which are overlapped by a number of symbols in the time domain, and the receiving terminal does data sequence detection in the time domain for the received signals according to the one-to-one relationship between the transmission data sequence and the time waveform of the transmission data sequence. In addition, the present invention also provides a kind of Time Division Multiplexing system based on the above method of the Time Division Multiplexing. The present invention makes actively use of these overlapping to produce the coding constraint relation, thus the spectral efficiency of the system is improved by a large margin. In random time-varying channel, with reasonable arrangement, the transmission reliability of the system can also be improved at the same time, and at the same threshold, Signal Interference Ratio and its spectral efficiency are far higher than those of the high-dimension modulation and other technologies. At the same spectrum efficiency, the number of the total levels of its systems and the needed threshold Signal Interference Ratio are also reduced significantly than those of the high-dimension modulation and other technologies.

Variable gain low noise amplifier (LNA) system to reduce linearity requirements on a radio receiver. In the receiver, the LNA is coupled to receive an RF signal and produce an amplified signal at an LNA output. The receiver also comprises a VGA coupled to the LNA output to receive the amplified signal and produce a VGA output to downstream components of the receiver. The receiver also comprises a control network coupled to the LNA and the VGA. The control network operates to adjust gain factors of the continuously variable LNA and the VGA based on a received power indicator of the RF signal, so that a signal-to-noise ratio required for demodulation of the RF signal is met with a selected margin and the linearity requirements of the receiver are reduced.

The present invention relates to a low power consumption receiver which can dynamically detect the blocking interference signal and belongs to the technical field of wireless communication. The receiver comprises the following components: a radio frequency amplifier, a frequency synthesizer, a first frequency mixer, a low-pass filter, a variable gain amplifier and an analog-digital converter which are connected in sequence. The receiver also comprises a blocking interference signal detector and a system configuration regulator connected with the detector. The input end of the blocking interference signal detector can be connected with the output end of the analog-digital converter, and can be connected with the input ends and output ends of the low-pass filter and variable gain amplifier at the same time. The output end of the system configuration regulator is connected with at least one device in all devices respectively, or is connected with a plurality of receiving chains which arecomposed of the devices through an N-route multiplexer. The receiver presented by the invention can automatically detect the strength of the blocking interference signal and regulates the system configuration correspondingly. The receiver is leaded to work in different working modes in order to adapt different working environments.

The invention discloses a device for improving the transmitting and receiving isolation of a mobile terminal, which is positioned between a diplexer and a signal receiving terminal. The device comprises a first coupler which is connected with the diplexer and the signal receiving terminal and is also connected with a modulation circuit and used for coupling a leak signal transmitted from the diplexer with a modulated signal transmitted from the modulation circuit; then the signal after coupling is transmitted to the receiving terminal; and the device also comprises the modulation circuit which is used for modulating a part of an emitting signal and sending the signal after modulation to the first coupler and a second coupler which is connected with the diplexer and an emitting terminal and is also connected with the modulation circuit and is used for coupling a part of the emitting signal to output to the modulation circuit. The invention also discloses a corresponding method to determine the modulation circuit structure and the modulation values of the amplitude, the delay and the phase regulating values of the part of the emitting signal according to the leak signal; the modulation signal is coupled with the leak signal, and the signal after coupling is input into the receiving terminal. The invention can improve the quality of receiving signals, reduce the requirements of the diplexer and so on to isolation and extend standby time.

The invention belongs to the technical field of rotating machinery detection and in particular relates to a torque change measurement device and method for detecting the rotating machinery in the operation process. The torque measurement device comprises magnets (2), inductive transducers (3), a signal conditioning module (4), an acquisition module (5) and a computer processing system (6). The torque measurement method comprises the following steps: 1) selecting two measuring points; 2) installing the torque measurement device; 3) acquiring an unloaded initial signal; 4) acquiring a loaded turn signal; and 5) computing the torque of the shaft to be measured. The invention is convenient and simple to install, easy and practical to operate and high in measurement precision, has no requirement for installation precision, basically dispenses with adjustment, can greatly save the measurement preparation time, simultaneously has low requirement for the linearity of the sensor, saves cost and can be widely applied to the field of rotating machinery monitoring and diagnosis.

The invention discloses a spectrum confocal measurement system calibrating device and calibrating method. The spectrum confocal measurement system calibrating device comprises a tunable laser, a double-branch optical fiber, an optical fiber emergent light beam, a dispersion object lens, a dispersion object lens emergent light beam, an object to be detected, a displacement table, a spectrometer and a computer. The spectrum confocal measurement system calibrating method comprises steps of recording a position of a detected object, on which a displacement is applied, through a displacement sensor, setting an output wavelength range of the tunable laser to enable the tunable laser to successively emit monochromatic laser beams covering a working waveband of the dispersion object lens, recording the size of the wavelength of the laser beam emitted by the tunable laser in the current lambda and a spectrum signal having a biggest amplitude in the spectrometer and a pixel number n corresponding to a peak value position of the spectrum signal, and establishing a relation between a wavelength and displacement of the detected object through a correspondence relation between the n and the lambda. The spectrum confocal measurement system calibrating device and calibrating method effectively reduce requirements of the dispersion object lens for linearity in the spectrum confocal measurement system and improves measurement accuracy of the spectrum confocal measurement system.

The invention discloses a low peak-to-average ratio wireless light transmission method with clipping moving. The feature that one of paring signals in ACO-OFDM time domain signals must be zero is utilized, if a positive signal in the pairing signals exceeds the set threshold value, clipping is conducted on the positive signal, and the clipped quantity is put at the zero position in the paring signals, and therefore the function of reducing the PAPR is achieved. The low peak-to-average ratio wireless light transmission method is easy to achieve, the PARP of an ACO-OFDM wireless optical communication system can be effectively reduced, system power consumption is reduced, the requirement for the linearity of a power amplifier and an LED lamp is lowered, nonlinear distortion of the signals in electricity and light domains is reduced, and therefore the receiving performance of the system is improved.

A radio frequency receiver includes an amplifier and a detector that produces a bias control signal based on a signal environment. A bias level of the amplifier is set according to the bias control signal. Bias levels other receiver circuits may have similarly adjusted bias levels, including buffers, IF oscillators, mixers, and converters. The invention can be used to increase range of linearity, intermodulation immunity and reduce power consumption by reducing the bias level under typical conditions and relying on the bias control to increase bias levels under adverse signal conditions. The invention has advantages where power is at a premium, particularly when a device is in standby mode, including mobile, portable and hand held pagers and wireless telephones and Internet connections. If standby mode operation in non-maximum signal environments dominates the usage of the receiver, then the invention can substantially increase battery life.

The invention relates to a direct current (DC) bus voltage-sampling circuit of a servo system converting a voltage to a frequency, comprising a resistance-sampling divider circuit, a V / F converting circuit and an isolation optocoupler circuit. The resistance-sampling divider circuit is connected with a DC bus to acquire an input voltage Vin which is about 10V on the bus by voltage division when the bus is in full voltage; the input end of the V / F converting circuit is connected with the resistance-sampling divider circuit and converts an input voltage value into a pulse frequency signal in a direct frequency and voltage proportion; the primary positive end of the isolation optocoupler circuit is connected with the output end of the V / F converting circuit; the secondary end of the isolation optocoupler circuit is connected with the I / O of a DSP; and pulse signals with the same frequency are input to the DSP to acquire corresponding digital quantities. The invention has the advantages of good input / output linearity and high reliability and accuracy.

The invention discloses a method for realizing co-frequency full duplex wireless communication, which belongs to the field of wireless communication, aims to overcome defects of two basic duplex methods,namely, frequency division duplex (FDD) and time division duplex (TDD), of wireless communication, that is, FDD occupies wide frequency band and TDD is low in time availability, and consequentially realizes co-frequency full duplex wireless communication. According to the invention, both parties involved in communication have same signal band, receive and transmit signals simultaneously; angle modulation is taken as a signal modulation manner, and a sent radio-frequency signal is taken as a local oscillation signal of a receiver; the coherent reception technology is adopted for separating transceiving signals in the same frequency band; and a series of technologies including direct frequency conversion, signal offset, DC removal and adaptive filtering are combined to realize the purpose of co-frequency full duplex wireless communication. The method can be used for miniwatt bothway wireless communication.

An object of the present invention is to provide a method for manufacturing electrodes that can effectively suppress edge-curl when metal electrodes such as bus electrodes and data electrodes are patterned mainly by a photolithography method.In order to achieve the above object, in the manufacturing method in the present invention, an amount of undercut generated by difference in a degree of dissolution caused by developing solution is controlled, and baking is performed at a temperature such that glass in a protrusion formed at side edges becomes soft so as to touch a substrate by gravity. With such method for manufacturing, it becomes possible to make the side edges rounded whose curvature changes continuously.

A wafer processing method divides a wafer into a plurality of individual devices along a plurality of crossing division lines formed on the front side of the wafer. The method includes a functional layer removing step of applying a CO2 laser beam to the wafer along each division line with the spot of the CO2 laser beam, having a width corresponding to the width of each division line set on the upper surface of each division line, thereby removing a functional layer along each division line to form a groove along each division line where the functional layer has been removed, and a groove shaping and debris removing step of applying a laser beam having a wavelength in the ultraviolet region to the wafer along each groove, thereby removing debris sticking to the bottom surface of each groove and also shaping the side walls of each groove.

An apparatus includes an operational amplifier and a plurality of capacitors coupled to an input terminal of the operational amplifier and configured to be selectively coupled to receive one of an input voltage signal and an output voltage signal of the operational amplifier.

The invention discloses a fully-integrated anti-blocking radio frequency receiving front-end architecture. The fully-integrated anti-blocking radio frequency receiving front-end architecture comprises a blocking signal filtering stage and a down mixing stage. The blocking signal filtering stage is a feed-forward structure, and a main branch and a feed-forward branch use low-noise amplifiers with the same circuit structures to realize matching. The feed-forward branch uses the impedance moving feature of a passive mixer at the frequency domain, a band elimination filter is generated at a radio frequency local oscillator to filter useful signals, and then a usable radio frequency signal is obtained through subtracting the obtained blocking signal from the blocking signal of the main branch. Because the blocking signal is directly filtered after two low-noise amplifiers, the influence on the other circuit is avoided, and the other non-ideal factors are avoided. The down mixing is realized to obtain a usable middle-frequency signal through connecting the passive mixer.

Disclosed is a burst communication system utilizing transient peak energy. A transmitter adopts a simplified expanded binary phase shift keying modulation mode, a receiver comprises a receiving antenna, the receiving antenna is connected with an analog receiver, the analog receiver is connected with an analog-to-digital converter, the analog-to-digital converter is connected with an EBPSK (expanded binary phase shift keying) digital modulator, and the EBPSK digital modulator is connected with a frame processor; the analog receiver comprises a pre-amplifier, the pre-amplifier is connected with a frequency mixer, and the frequency mixer is connected with an intermediate-frequency amplifier; and the EBPSK digital modulator comprises a digital impacting filter, the digital impacting filter is connected with a preprocessor, the preprocessor is connected with a return-to-zero decision device, the return-to-zero decision device is connected with a delay calculation module, both the delay calculation module and the preprocessor are connected to a variable delayer, the variable delayer is connected with an integration decision device, the return-to-zero decision device is further connected with a clock generator, the clock generator is connected to the integration decision device, and a frequency synthesizer is respectively connected to the frequency mixer and the clock generator.

The present invention provides a transmission method which generates and sends a transmission signal generated from a multiplexing OFDM signal or a multiplexing wavelet-OFDM signal employing a multiplexing-spread chip sequence in which a chip of a code sequence for spread and a code sequence for combination, and a chip of a code sequence for localization are multiplied and multiplexed, and a receiving method which makes a high SN ratio improvement rate possible by converting the received signal to a frequency domain to acquire the multiplexing-spread chip sequence and by performing de-spreading and localizing processing to detect a localized pulse. According to the data transmission using the transmission and receiving method, data is mapped into a code sequence, and the receiving side can detect the data as the kind of code sequence, the shift time of a localized pulse and the polarity at a high SN ratio improvement rate. Further, when used in a measuring system, the transmission and receiving method can obtain information associated with an object to be measured on the basis of the aspect and the characteristics of a localized pulse by calculating the localized pulse from a signal detected from the object to be measured at a high SN ratio improvement rate.

A Phase-Locked Loop (PLL) includes a Phase-to-Digital Converter (PDC), a programmable digital loop filter, a Digitally-Controlled Oscillator (DCO), and a loop divider. Within the PDC, phase information is converted into a stream of digital values by a charge pump and an Analog-to-Digital Converter (ADC). The stream of digital values is supplied to the digital loop filter which in turn supplies digital tuning words to the DCO. A number of types of ADCs can be used for the ADC including a continuous-time delta-sigma oversampling Digital ADC and a Successive Approximation ADC. The voltage signal on the charge pump output is a small amplitude midrange voltage signal. The small voltage amplitude of the signal leads to numerous advantages including improved charge pump linearity, reduced charge pump noise, and lower supply voltage operation of the overall PLL.

An air germicidal treatment device and system for removing or eliminating unwanted pathogens or bacteria in an airstream is shown. The device or system has a removable irradiation chamber that divides an interior area of the device into an air pre-chamber area, an air post-chamber area and an irradiation area therebetween. The removable irradiation chamber is generally trapezoidal in shape and has end walls that are inclined with respect to an interior divider wall.

The invention relates to a system and method for inhibiting an OFDM peak-to-average ration by combining pulse shaping with digital pre-distortion. For the problem that the OFDM signal high peak-to-average ratio produces serious nonlinear distortion and transmission signal spectrum diffusion in a nonlinear transmitting channel, on the one hand, the high PAPR of the OFDM is reduced by using the phase shaping technology starting from the signal construction of the OFDM; on the other hand, the linear range of a power amplifier is improved by using the self-adaptive digital pre-distortion technology starting from the nonlinear power amplifier performance, therefore, a method of combining the pulse shaping technology with the self-adaptive digital pre-distortion technology is proposed, the requirement on the transmitting channel linearity by the high PAPR of the OFDM signal is reduced; a simulation result shows that the PAPR of the OFDM signal is small, the power amplifier linear range is large, so that the transmitting power of the signal can be increased, the signal-to-noise ratio of the system is indirectly improved,, thereby effectively improving the system performance.

A system, method, and computer-usable medium are presented for controlling viewing angle characteristics by performing a color palette gradation control of a liquid crystal display, such that adjustment effects on a viewing angle range are improved.

A power amplification module includes a first amplification transistor that receives a first signal outputs an amplified second signal from the collector thereof; and a bias circuit that supplies a bias current to the base of the first amplification transistor. The first bias circuit includes a first transistor that is diode connected and is supplied with a bias control current; a second transistor that is diode connected, the collector thereof being connected to the emitter of the first transistor; a third transistor, the base thereof being connected to the base of the first transistor, and the bias current being output from the emitter thereof; a fourth transistor, the collector thereof being connected to the emitter of the third transistor and the base thereof being connected to the base of the second transistor; and a first capacitor between the base and the emitter of the third transistor.

An object of the present invention is to provide a method for manufacturing electrodes that can effectively suppress edge-curl when metal electrodes such as bus electrodes and data electrodes are patterned mainly by a photolithography method. In order to achieve the above object, in the manufacturing method in the present invention, an amount of undercut generated by difference in a degree of dissolution caused by developing solution is controlled, and baking is performed at a temperature such that glass in a protrusion formed at side edges becomes soft so as to touch a substrate by gravity. With such method for manufacturing, it becomes possible to make the side edges rounded whose curvature changes continuously.