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146 results about "Gain-switching" patented technology
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Gain-switching is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration, of the order of picoseconds (10⁻¹² s). In a semiconductor laser, the optical pulses are generated by injecting many carriers (electrons) into the active region of the device, bringing the carrier density within that region from below to above the lasing threshold. When the carrier density exceeds that value, the ensuing stimulated emission results in the generation of many photons.
High performance imaging system for diffuse optical tomography and associated method of use
ActiveUS7983740B2High bandwidthImprove performanceDiagnostics using tomographySensorsOptical tomographyImaging quality
A high performance imaging system for diffuse optical tomography is disclosed. A dense grid utilizing sources, e.g., light emitting diodes (“LEDs”), that achieve high performance at high speed with a high dynamic range and low inter-channel crosstalk are complemented by a system of discrete, isolated receivers, e.g., avalanche photodiodes (“APDs”). The source channels have dedicated reconfigurable encoding control signals, and the detector channels have reconfigurable decoding, allowing maximum flexibility and optimal mixtures of frequency and time encoding and decoding. Each detector channel is analyzed by dedicated, isolated, high-bandwidth receiver circuitry so that no channel gain switching is necessary. The resulting improvements to DOT system performance, e.g., increased dynamic range and decreased crosstalk, enable higher density imaging arrays and provide significantly enhanced DOT image quality. A processor can be utilized to provide sophisticated three dimensional modeling as well as noise reduction.
Owner:WASHINGTON UNIV IN SAINT LOUIS
Auto-gain switching module for acoustic touch systems
ActiveUS8692809B2Gain controlInput/output processes for data processingGain-switchingComputer module
An apparatus for processing signals received from an acoustic touch surface comprises an analog input receiving an analog input signal having a signal level. The analog input signal comprises data indicative of a touch location on a touch surface. A plurality of gain elements receive the analog input signal and output gain-adjusted analog signals. A gain selection module selects one of the gain-adjusted analog signals based on the signal level of the analog input signal.
Owner:ELO TOUCH SOLUTIONS INC
Transimpedance Amplifier
ActiveUS20080309407A1Gain controlAmplifier modifications to reduce detrimental impedenceHysteresisAudio power amplifier
A gain switching determination circuit (250) compares / determines a comparative input voltage (Vc) from an inter-stage buffer (230) with a first hysteresis characteristic, and outputs a gain switching signal (SEL) based on the comparison / determination result to first and second transimpedance amplifier core circuits (210, 220), thereby switching the gains of the core circuits. This obviates holding a comparison input voltage with long response time in a level holding circuit for gain switching determination, which allows instantaneous gain switching determination and instantaneous response corresponding to burst data.
Owner:NIPPON TELEGRAPH & TELEPHONE CORP +1
Mobile communication terminal device and variable gain circuit
InactiveUS7149487B2Guaranteed uptimeError preventionGain controlVariable-gain amplifierGain-switching
In receiver systems for cellular phones using the W-CDMA method, the change in DC voltage occurring when the gain of a programmable gain amplifier (PGA circuit) is switched to adjust the gain for a received signal, can be suppressed. A sample-and-hold circuit is installed containing a “sample” mode for directly outputting a signal from the PGA section and also containing a “hold” mode for outputting the electric charge of a specified voltage stored in a capacitor. This sample-and-hold circuit normally operates in “sample” mode so the output signal from the PGA section is directly output, but is operated in “hold” mode at the gain switching timing of the PGA circuit, so that the electric charge of the specified voltage stored in the capacitor is output for a specified length of time (equal to the time required for the DC voltage change to converge to a stable level).
Owner:SONY ERICSSON MOBILE COMM JAPAN INC
Energy-efficient, laser-based method and system for processing target material
InactiveUS20060086702A1Guaranteed uptimeRule out the possibilityLaser detailsSemiconductor/solid-state device detailsControl signalEngineering
An energy-efficient method and system for processing target material such as microstructures in a microscopic region without causing undesirable changes in electrical and / or physical characteristics of material surrounding the target material is provided. The system includes a controller for generating a processing control signal and a signal generator for generating a modulated drive waveform based on the processing control signal. The waveform has a sub-nanosecond rise time. The system also includes a gain-switched, pulsed semiconductor seed laser for generating a laser pulse train at a repetition rate. The drive waveform pumps the laser so that each pulse of the pulse train has a predetermined shape. Further, the system includes a laser amplifier for optically amplifying the pulse train to obtain an amplified pulse train without significantly changing the predetermined shape of the pulses. The amplified pulses have little distortion and have substantially the same relative temporal power distribution as the original pulse train from the laser. Each of the amplified pulses has a substantially square temporal power density distribution, a sharp rise time, a pulse duration and a fall time. The system further includes a beam delivery and focusing subsystem for delivering and focusing at least a portion of the amplified pulse train onto the target material. The rise time (less than about 1 ns) is fast enough to efficiently couple laser energy to the target material, the pulse duration (typically 2-10 ns) is sufficient to process the target material, and the fall time (a few ns) is rapid enough to prevent the undesirable changes to the material surrounding the target material.
Owner:ELECTRO SCI IND INC
Dynamic gain switching digital to analog converter
ActiveUS20150249466A1Power saving provisionsElectric signal transmission systemsDigital analog converterGain-switching
A digital to analog converter that may include a digital gain block; an analog gain block; a digital to analog conversion (DAC) block and a controller that is configured to: determine a digital gain factor, selected out of multiple digital gain factors, of the digital gain block and an analog gain factor, selected out of multiple analog gain factors of the analog gain block; wherein the DAC block is preceded by the digital gain block and is followed by the analog gain block; wherein the digital gain block is configured to multiply a digital input signal by the digital gain factor to provide an intermediate digital signal; wherein the DAC block is configured to convert the intermediate digital signal to a converted analog signal; and wherein the analog gain block is configured to multiply the converted analog signal by the analog gain factor to provide an output signal; wherein an increment of the analog gain factor results in a decrement of the digital gain factor.
Owner:DSP GROUP
Wireless communication receiver
InactiveUS20060128334A1Reduce circuit areaSuppression of levelEnergy efficient ICTGain controlControl signalQ-switching
To reduce circuit area and power consumption and suppress transient response occurring at switching in PGA of a programmable gain amplifier is provided a wireless communication receiver comprising PGAs for adjusting the gain of a received signal down-converted by mixers and sending it to base-band block. Within PGAs are provided HPFATT circuits formed of capacitors arranged in series, and ladder resistors arranged in parallel, with signal lines, and a plurality of switches. HPFATT is a circuit serving as a high-pass filter and an attenuator for gain switching, wherein switches are controlled by control signal sg from a controller. Amplifiers connected to the rear stage of the HPFATT circuit are formed of MOS transistors.
Owner:RENESAS TECH CORP
Q-switched, cavity dumped laser systems for material processing
InactiveUS7058093B2High strengthLow powerActive medium materialGas laser constructional detailsEngravingPeak value
This disclosure discusses techniques for obtaining wavelength selected simultaneously super pulsed Q-switched and cavity dumped laser pulses utilizing high optical damage threshold electro-optic modulators, maintaining a zero DC voltage bias on the CdTe electro-optic modulator (EOM) so as to minimize polarization variations depending on the location of the laser beam propagating through the CdSe EOM crystal, as well as the addition of one or more laser amplifiers in a compact package and the use of simultaneous gain switched, Q-switched and cavity dumped operation of CO2 lasers for generating shorter pulses and higher peak power for the hole drilling, engraving and perforation applications.
Owner:COHERENT INC
Energy efficient, laser-based method and system for processing target material
InactiveUS20080035614A1Rule out the possibilityPromote resultsLaser detailsSemiconductor/solid-state device detailsControl signalEngineering
Owner:ELECTRO SCI IND INC
High Performance Imaging System for Diffuse Optical Tomography and Associated Method of Use
ActiveUS20080154126A1Improve performanceReduce crosstalkMaterial analysis by optical meansDiagnostics using tomographyOptical tomographyImaging quality
A high performance imaging system for diffuse optical tomography is disclosed. A dense grid utilizing sources, e.g., light emitting diodes (“LEDs”), that achieve high performance at high speed with a high dynamic range and low inter-channel crosstalk are complemented by a system of discrete, isolated receivers, e.g., avalanche photodiodes (“APDs”). The source channels have dedicated reconfigurable encoding control signals, and the detector channels have reconfigurable decoding, allowing maximum flexibility and optimal mixtures of frequency and time encoding and decoding. Each detector channel is analyzed by dedicated, isolated, high-bandwidth receiver circuitry so that no channel gain switching is necessary. The resulting improvements to DOT system performance, e.g., increased dynamic range and decreased crosstalk, enable higher density imaging arrays and provide significantly enhanced DOT image quality. A processor can be utilized to provide sophisticated three dimensional modeling as well as noise reduction.
Owner:WASHINGTON UNIV IN SAINT LOUIS
Electrically-Pumped Semiconductor Zigzag Extended Cavity Surface Emitting Lasers and Superluminescent Leds
ActiveUS20090207873A1High power amplificationInsufficient optical gainLaser detailsLaser optical resonator constructionAudio power amplifierDistributed Bragg reflector
A semiconductor surface emitting optical amplifier chip utilizes a zigzag optical path within an optical amplifier chip. The zigzag optical path couples two or more gain elements. Each individual gain element has a circular aperture and includes a gain region and at least one distributed Bragg reflector. In one implementation the optical amplifier chip includes at least two gain elements that are spaced apart and have a fill factor no greater than 0.5. As a result the total optical gain may be increased. The optical amplifier chip may be operated as a superluminescent LED. Alternately, the optical amplifier chip may be used with external optical elements to form an extended cavity laser. Individual gain elements may be operated in a reverse biased mode to support gain-switching or mode-locking.
Owner:PHILIPS LUMILEDS LIGHTING CO LLC +1
Auto-gain switching module for acoustic touch systems
ActiveUS20080007543A1Gain controlInput/output processes for data processingGain-switchingSimulation based
An apparatus for processing signals received from an acoustic touch surface comprises an analog input receiving an analog input signal having a signal level. The analog input signal comprises data indicative of a touch location on a touch surface. A plurality of gain elements receive the analog input signal and output gain-adjusted analog signals. A gain selection module selects one of the gain-adjusted analog signals based on the signal level of the analog input signal
Owner:ELO TOUCH SOLUTIONS INC
Optical pulse source
InactiveUS6208672B1Semiconductor laser arrangementsTime-division optical multiplex systemsGain-switchingBroadband
An optical pulse source includes a gain-switched semiconductor laser diode. Light from a continuous wave source is opitically coupled into the laser cavity. Light output from the laser cavity passes through an electro-optic amplitude modulator. Synchronized modulating signals are applied to the semiconductor diode and to the amplitude modulator. The source outputs short low-jitter low-pedestal optical pulses and is suitable for use, for example, in a broadband optical network operating at thigh bit rates of 100 Gbit / s or more, or in an optical interconnect.
Owner:IPG PHOTONICS CORP
Method for dynamically adjusting current channel gain of wide-range electric energy meter
The invention relates to a method for dynamically adjusting the current channel gain of a wide-range electric energy meter. The method comprises the following steps of: (1) partitioning an entire measuring range into a plurality of measuring ranges on an MCU (Microprogrammed Control Unit) module of the electric energy meter, wherein an overlap region exists between every two adjacent measuring ranges, and every measuring range corresponds to a gain value; and (2) making the MCU module of the electric energy meter receive a signal from an ADC (Analog to Digital Converter) module to compute the input value of a signal input end and adjust the gain value of a programmable gain amplifier according to a measuring range at which the input value is positioned, wherein the gain value of the programmable gain amplifier is not adjusted by the MCU module of the electric energy meter when the input value is in the overlap region. According to the method, dynamic gain can be performed on an input current signal to meet the requirements of a high-magnification and high-accuracy electric energy meter, and repeated jitter of gain switching can be prevented simultaneously.
Owner:ZHUHAI ZHONGHUI MICROELECTRONICS
Speaker driving device and audio output system
ActiveUS20060093153A1Increasing chip sizeReduce chip sizeSubstation/switching arrangement detailsPower amplifiersGain-switchingEngineering
The present invention detects whether the supply voltage applied to the power supply terminal (3) is used for the dynamic speaker or for the piezoelectric speaker by the power supply voltage detection circuit (10), switches the gain of the amplifier circuit (8) in accordance with the detection result by the gain switching circuit (11) so that the same output power is produced for the same input signal in the respective speaker driving, and amplifies the input signal from the input terminal (5) by the amplifier circuit (8) having the gain to drive a speaker (1) that is connected to the output terminals (6, 7).
Owner:GK BRIDGE 1
Gain-control method and device for cascaded amplifiers
InactiveUS6927628B2Easy to switchLow costGain controlAmplifier combinationsGain-switchingEngineering
A gain-control method and device that enable high-speed gain switching of cascaded programmable gain amplifiers (PGA) without a high-resolution A / D converter is provided. In one example, the gain-control method for cascaded PGAs detects all the input levels of the PGAs, calculates the optimum gains of the PGAs each on the basis of the detection results, and sets the obtained optimum gains of each of the PGAs at one time, whereby high-speed gain switching becomes possible. The gain-control device for cascaded PGAs that implements this gain-control method includes peak hold circuits that retain the input levels of each of the PGAs, a switch group that sequentially switches outputs of the peak hold circuits, an A / D converter that sequentially detects the outputs from the switch group, and a control and operation device that calculates the optimum gains of the PGAs from the detection results by the A / D converter to set the calculated optimum gains simultaneously to each of the PGAs.
Owner:RENESAS ELECTRONICS CORP
Light measuring apparatus and a method for correcting non-linearity of a light measuring apparatus
ActiveUS20050128475A1Highly precisely and efficiently correctPhotometry using reference valueRadiation pyrometrySensor arrayMeasurement device
A correction LED is provided to illuminate a light receiving sensor array, and a calculation controlling circuit calculates correction values at the respective illuminance levels based on sensor output levels expected at the respective illuminance levels and actual sensor output levels while successively turning the correction LED on at a plurality of illuminance levels whose illuminance ratios are at least known, and corrects a sensor output level by the corresponding correction value to obtain a measurement output at the time of an actual measurement. The discontinuity of an input / output characteristic resulting from the switching of gains of an amplifier for amplifying a photocurrent and the non-linearity caused by the saturation of the photoelectrically converting characteristic of the optical sensor and the exponential characteristics of the optical sensor and the amplifier can be corrected without employing a large-scale construction such as a bench. The non-linearity can be highly precisely and efficiently corrected in a measuring apparatus realized as a spectral luminometer or a spectral calorimeter without requiring a special facility.
Owner:KONICA MINOLTA SENSING INC
Transimpedance amplifier
A gain switching determination circuit (250) compares / determines a comparative input voltage (Vc) from an inter-stage buffer (230) with a first hysteresis characteristic, and outputs a gain switching signal (SEL) based on the comparison / determination result to first and second transimpedance amplifier core circuits (210, 220), thereby switching the gains of the core circuits. This obviates holding a comparison input voltage with long response time in a level holding circuit for gain switching determination, which allows instantaneous gain switching determination and instantaneous response corresponding to burst data.
Owner:NIPPON TELEGRAPH & TELEPHONE CORP +1
Q-switching-induced Gain-switched Erbium Pulse Laser System
InactiveUS20130016422A1Improve laser efficiencyActive medium materialFibre transmissionGain-switchingErbium lasers
The present invention relates to a Q-switching-induced gain-switched erbium pulse laser system, capable of generating erbium laser pulses within the 2.5 μm to 3.0 μm wavelength region, by means of Q-switching operation at 1.6 μm. At first, an Er3+-doped gain medium is pumped and Q-switched at the wavelength region from 1.58 μm to 1.62 μm, so that a Q-switched pulse is formed from the Er3+-doped gain medium. The Q-switched pulse results in an instant positive population inversion between the levels 4I11 / 2 and 4I13 / 2 of the Er3+-doped gain medium, followed by a gain-switched laser pulse at the wavelength region from 2.5 μm to 3.0 μm.
Owner:NAT CHENG KUNG UNIV
Hydraulic control device
ActiveUS20120138415A1Improve controllabilityReduce component countFluid actuated clutchesGearing controlSolenoid valveGain-switching
A hydraulic control device is provided with a linear solenoid valve, a shift valve, and a controller. The linear solenoid valve has a gain switching chamber which produces a biasing force in a direction to close the linear solenoid valve to switch the gain characteristic of the linear solenoid valve when oil pressure is supplied to the gain switching chamber. The shift valve is configured to be switchable between a supply state in which the output oil pressure from the linear solenoid valve is supplied to the gain switching chamber and a blocked state in which the supply of the output oil pressure is blocked. The controller brings the shift valve into the supply state when a necessary oil pressure of an engagement element is high and into the blocked state when the necessary oil pressure of the engagement element is low.
Owner:HONDA MOTOR CO LTD
Transimpedance amplifier
ActiveCN1993885AAchieve instantaneous responseGain controlAmplifiers controlled by lightHysteresisAudio power amplifier
A gain switch determination circuit (250) uses a first hysteresis characteristic to perform a comparison / determination of a comparison input voltage (Vc) from an inter-stage buffer circuit (230), and a gain switch signal (SEL) based on a result of the comparison / determination is outputted to first and second transimpedance amplifier core circuits (210,220), thereby switching the gains of those core circuits. This eliminates the necessity of using a level hold circuit, which exhibits a slow response, to hold the comparison input voltage so as to perform a gain switch determination. As a result, an instant gain switch determination can be achieved, thereby realizing an instant response to burst data.
Owner:NIPPON TELEGRAPH & TELEPHONE CORP +1
Aircraft posture kinetics simplified model gain switching proportion-differential control design method
InactiveCN101339404AControl adjustment timeControl step responseControllers with particular characteristicsControl systemGain-switching
The invention relates to a design method for derivative controlling the gain switching ratio of an aerocraft pose dynamics simplified model, which adopts a nonlinear gain switching PD controlling scheme and allows two PD subcontrollers (a rapid PD subcontroller and a heavy damping subcontroller) designed with different parameters and complementary performance cooperatively function by stages according to switching rules designed. Meanwhile, on the basis of the guarantee of stability of an enclosed ring controlling system in the large, the step response of the system with no overshoot is realized, and the adjusting time of the step response is flexibly adjusted to meet the design requirements of rapidity. The technical scheme of the designing method comprises that: a first step, the structure of the enclosed ring controlling system is designed; a second step, a gain switching strategy section is designed; a third step: the gain parameters of two PD subcontrollers are designed; a fourth step: the rapidity of the step response is inspected and adjusted; a fifth step: the stability of an enclosed ring controlling system in the large is validated; a sixth step: the design is finished.
Owner:BEIHANG UNIV
Current to voltage conversion circuit for photo detector integrated circuit employing gain switching circuit
InactiveCN1604209AQuick responseImprove frequency characteristicsNegative-feedback-circuit arrangementsGain controlAudio power amplifierGain-switching
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
Light measuring apparatus and a method for correcting non-linearity of a light measuring apparatus
ActiveUS7286215B2Highly precisely and efficiently correctPhotometry using reference valueRadiation pyrometrySensor arrayEngineering
A correction LED is provided to illuminate a light receiving sensor array, and a calculation controlling circuit calculates correction values at the respective illuminance levels based on sensor output levels expected at the respective illuminance levels and actual sensor output levels while successively turning the correction LED on at a plurality of illuminance levels whose illuminance ratios are at least known, and corrects a sensor output level by the corresponding correction value to obtain a measurement output at the time of an actual measurement. The discontinuity of an input / output characteristic resulting from the switching of gains of an amplifier for amplifying a photocurrent and the non-linearity caused by the saturation of the photoelectrically converting characteristic of the optical sensor and the exponential characteristics of the optical sensor and the amplifier can be corrected without employing a large-scale construction such as a bench. The non-linearity can be highly precisely and efficiently corrected in a measuring apparatus realized as a spectral luminometer or a spectral colorimeter without requiring a special facility.
Owner:KONICA MINOLTA SENSING INC
Security apparatus
InactiveUS7224263B2Quick checkPedestrian/occupant safety arrangementAnti-theft devicesGain-switchingEngineering
An IG key monitor sends out an anti-theft instruction to a GAIN switching part, in case that an IG key SW (ignition key switch) was turned to an OFF state. The GAIN switching part receives the anti-theft instruction from the IG key monitor, and then, switches detection sensitivity of an acceleration sensor to second detection sensitivity (which is detection sensitivity available for inclination judgment of a vehicle, and for example, is approximately ±2 G). An inclination judgment part judges whether or not a vehicle is inclined on the basis of a detection result of the acceleration sensor whose detection sensitivity was switched as described above, and outputs an anti-theft alarm through an alarm part, in case that an output of the acceleration sensor exceeds 0.1 G.
Owner:FUJITSU GENERAL LTD
Gain-switched fiber laser system
InactiveUS7787506B1Simple and reliable and compactLaser using scattering effectsNon-linear opticsHarmonicGain-switching
This invention discloses a method to control laser dynamics in a gain-switched fiber laser so as to generate stable, clean pulses in an all-fiber format. The gain-switched fiber laser is suitable as a standalone laser source, and as a pump source for harmonic generation and an optical-parametric-oscillator.
Owner:COHERENT INC
Converter control device
A converter device which is configured by connecting three converter circuits in parallel is provided between a secondary battery serving as a first power supply and a fuel cell serving as a second power supply. A control unit includes a PID control module which controls the converter device by PID control, for executing desired voltage conversion; a module for modifying the number of drive phases which changes the number of drive phases of the converter device in response to an electric power passing through the converter device; and a gain switching module which switches feedback gains in the PID control when the number of drive phases is changed.
Owner:TOYOTA JIDOSHA KK
Automatic gain control method and device
The invention relates to the technical field of mobile communication and discloses an automatic gain control method and a device. On the basis of guaranteeing timeliness and cost of automatic gain control, the automatic gain control method and the device are used for improving performance of the automatic gain control. The automatic gain control method comprises the following steps: capturing system configuration information and corresponding characteristics, determining gain switching time of AGC according to the system configuration information and the corresponding characteristics, counting symbol level time-frequency domain metrical information between the current gain switching time and the next gain switching time, the symbol level time frequency domain metrical information comprises frequency domain power Pw of default resource unit location in various symbols and time domain power Psymbol of the various symbols, comparing the symbol level time frequency domain metrical information with an adaptive gain control target value, obtaining a logarithmic domain difference value, and according to the logarithmic domain difference value, completing gain switching of the automatic gain control at the next gain switching time.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD
Semiconductor integrated circuit device and wireless communication system
InactiveUS7233206B2Large fluctuationsReduce power consumptionResonant long antennasGain controlConstant powerDual mode
Owner:RENESAS ELECTRONICS CORP
Converter control device
A converter device which is configured by connecting three converter circuits in parallel is provided between a secondary battery serving as a first power supply and a fuel cell serving as a second power supply. A control unit includes a PID control module which controls the converter device by PID control, for executing desired voltage conversion; a module for modifying the number of drive phases which changes the number of drive phases of the converter device in response to an electric power passing through the converter device; and a gain switching module which switches feedback gains in the PID control when the number of drive phases is changed.
Owner:TOYOTA JIDOSHA KK
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