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83results about "DC-isolation amplifier" patented technology
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Power amplifier
ActiveUS8253485B2Reduce voltageReduces cost and complexityGated amplifiersAmplifier combinationsAudio power amplifierCoupling
Owner:SONY EUROPE BV
Signal detecting circuit
ActiveUS20080197834A1Amplifier modifications to reduce noise influenceCurrent/voltage measurementAudio power amplifierElectrical polarity
The signal detecting circuit has a first amplifier which amplifies the supplied signals and outputs the amplified signals from first and second output terminals; a switch unit which supplies the signals to the first amplifier such that the polarity thereof is reversed between the first and second periods; a first capacitor, one end of which is connected to the first output terminal; a second capacitor, one end of which is connected to the second output terminal; a first switch, one end of which is connected to the other end of the second capacitor; a second amplifier having an inverting input terminal connected to the other end of the first capacitor, a non-inverting input terminal connected to the other end of the first switch, and an output terminal; a second switch which is connected to between the output terminal and the inverting input terminal, a third switch, one end of which is connected to the other end of the second capacitor; a fourth switch, one end of which is connected to the other end of the non-inverting input terminal; a threshold voltage source which is connected to between the other end of the third switch and the other end of the fourth switch; and a reference voltage source which is connected to either one of the other end of the third switch and the other end of the fourth switch. In the first period, the first switch is off, and the second to fourth switches are on; in the second period, the first switch is on, and the second to fourth switches are off.
Owner:KK TOSHIBA
Power amplifier
ActiveUS20110241782A1Reduce voltageReduces cost and complexityGated amplifiersAmplifier combinationsAudio power amplifierCoupling
A power amplifier comprises a series stack of power amplifier devices, connected in parallel to the amplifier input for receiving an RF input signal, and having output terminals being connected in series to the amplifier output. An intermediate coupling capacitor is connected between each adjacent pair of power amplifier devices in the series stack of power amplifier devices for DC isolation of said power amplifier devices. This reduces the required DC supply voltage, as well as allowing shorting of individual power amplifier devices in response to variation in the DC supply voltage.
Owner:SONY EUROPE BV
Shunt circuit linearity insulating circuit apparatus
InactiveCN1963538AImprove performanceOvercoming Latency DifferencesAmplifier with semiconductor-devices/discharge-tubesDC-isolation amplifierCapacitanceElectrical resistance and conductance
This invention relates to router linear isolation circuit device, which comprises transducer, photoelectricity isolation amplifier and signal combination device and one abstract frequency and one time parameter adjust circuit, wherein, the abstract frequency device is composed of low band filter and high band filter and one abstract device; the input signal is connected to low band filter or high band filter input end and first input end of abstract device; the low band and high band filter output end is connected to other end of abstract device.
Owner:李君
Differential signal amplification circuit, digital isolator, and digital receiver
ActiveCN111446935ASuppresses abnormal signal transmissionLogic circuit coupling arrangementsAmplifier modifications to reduce noise influenceIsolatorSoftware engineering
The invention discloses a differential signal amplification circuit, and a digital isolator and a receiver using the differential signal amplification circuit. The differential signal amplifying circuit comprises a multi-stage differential amplifier and a common-mode transient self-adaptive biasing circuit; and the common-mode transient adaptive bias circuit is used for detecting positive or negative common-mode transient interference signals of the positive input end and the negative input end and providing bias current of at least one stage of differential amplifier above the second stage when the positive or negative common-mode transient interference signals are detected. According to the technical scheme, abnormal signal transmission caused by common-mode interference signals can be suppressed.
Owner:SUZHOU NOVOSENSE MICROELECTRONICS CO LTD
Switching amplifiers
InactiveUS20090128237A1Improve noiseLow efficiencyAudio amplifierDC-isolation amplifierCapacitancePropagation delay
Systems and methods implemented in a switching amplifier for providing consistent, matching switching between top and bottom switching devices in a switching amplifier. One embodiment includes a half-bridge circuit output stage, a driver stage and a transformer. The driver stage, which drives the switches of the output stage, is very fast, has a low propagation delay, and has minimal input capacitance. The transformer drives the drive paths from the transformer inputs to the switches. The transformer avoids resonances within the audio band and at the amplifier switching frequencies, has low and spread free leakage inductance, has enough magnetizing inductance to keep transformer currents low in proportion to the total driver stage current drain, has low core losses at the switching frequency, has minimal inductance change and operates well below its saturation point. The amplifier stage provides a substantially constant amplitude drive signal to the output power switching devices.
Owner:INTERSIL INC
Wide bandwidth, high power amplifier
InactiveUS7486141B2Wide bandwidthPush-pull amplifiersPhase-splittersOutput transformerAudio power amplifier
A wide bandwidth, high power amplifier system for amplifying a signal in a radio frequency (RF) system in a specific bandwidth within the frequency range from 1 MHz to 100 GHz. The system includes a number of amplifier modules and an equal number of input transformers connected in series, with each input transformer providing an input signal to one amplifier module. It also includes an equal number of output transformers connected in series with each output transformer receiving an input signal from one amplifier module. The series of input transformers, the series of output transformers and the amplifier modules each provide an impedance matched approximately to the impedance of the RF system.
Owner:TREX ENTERPRISES CORP
Switching amplifier using flyback transformer
InactiveUS8212613B1More outputImprove efficiencyNegative-feedback-circuit arrangementsAmplifier modifications to raise efficiencyAudio power amplifierClass-D amplifier
A switching amplifying method or a switching amplifier for obtaining one or more than one linearly amplified replicas of an input signal, is highly efficient, and does not have the disadvantage of “dead time” problem related to the class D amplifiers. Another aspect of the present invention provides a switching amplifier that is completely off when there is no input signal. Yet another aspect of the present invention provides a switching amplifier for obtaining a plurality of different linearly amplified replicas of the input signal, and adds more slave outputs easily and economically.
Owner:HSIEH WEN HSIUNG
Microcurrent and current feedback chopper modulation instrument amplifier
InactiveCN104320096ACancel offset voltageHigh input impedanceAmplifier modifications to reduce noise influenceAmplifier modifications to reduce temperature/voltage variationCapacitanceLow noise
The invention belongs to the technical field of amplifiers, and particularly relates to a current feedback chopper modulation instrument amplifier working under a micro quiescent current. The amplifier consists of a blocking condenser, a current feedback chopper amplifier, an N-bit mismatch compensation capacitor array, a ripple canceling circuit, a biasing circuit and a clock frequency dividing circuit. The microcurrent and current feedback chopper modulation instrument amplifier has the characteristics of alternating current coupling, high input impedance, ultra-low offset voltage, low noise, high common mode rejection ratio, high power supply rejection ratio, micro-power consumption and the like; the circuit is particularly suitable for a wearable health monitoring system biopotential acquisition circuit adopting dry electrodes, and can eliminate semi-potential imbalance between electrodes in a rail-to-rail mode. The simulation result of one embodiment of the invention shows that the common-mode rejection ratio of the instrument amplifier is greater than 120 dB, the equivalent input impedance is greater than 500 M Ohm, and the noise energy efficiency factor NEF is equal to 4.5.
Owner:FUDAN UNIV
Low noise amplifier circuit
ActiveUS20170207761A1Negative-feedback-circuit arrangementsMagnetic measurementsCapacitanceIntegrator
A semiconductor circuit comprising an input block having a first chopper providing a chopped voltage signal, a first transconductance converting said chopped voltage signal into a chopped current signal, a second chopper providing a demodulated current signal, a current integrator having an integrating capacitor providing a continuous-time signal, a first feedback path comprising: a sample-and-hold block and a first feedback block, the first feedback path providing a proportional feedback signal upstream of the current integrator. The amplification factor is at least 2. Charge stored on the integrating capacitor at the beginning of a sample period is linearly removed during one single sampling period. Each chopper operates at a chopping frequency. The sample-and-hold-block operates at a sampling frequency equal to an integer times the chopping frequency.
Owner:MELEXIS TECH NV
Operational amplifier
InactiveUS20150357979A1Reduce gainEasy to operateAmplifier modifications to raise efficiencyDC-isolation amplifierAudio power amplifierBand-pass filter
There is provided an operational amplifier which is operable as well when an operating voltage decreases without creating a range where a circuit would not operate or reducing circuit gain. High-pass filters 102-105 provide output signals therefrom to bias-set input nodes of differential amplifiers Gm1-Gm4 to a potential within a common-mode range in which the respective differential amplifiers Gm1-Gm4 are operable. In this manner, the respective differential amplifiers Gm1-Gm4 can be operated effectively regardless of the possible decrease in a supply voltage, enabling normal amplifying operation. In addition, reduction in gain due to the reduced operational voltage is avoided. Therefore, it is preferably applicable to the application where digital and analog circuits are loaded together on the same IC chip. When a high-pass filter is required at each input side of two- or more-stage differential amplifiers, a phase compensation method utilizing multiple paths is provided for a lower range of a phase margin created at the low frequency side, enabling normal amplitude operation.
Owner:NAT INST OF ADVANCED IND SCI & TECH
Switching amplifiers
InactiveUS7816985B2Improve noiseLow efficiencyNegative-feedback-circuit arrangementsAmplifier modifications to raise efficiencyCapacitancePropagation delay
Owner:INTERSIL INC
Wide bandwidth, high power amplifier
InactiveUS20070152751A1Wide bandwidthPush-pull amplifiersPhase-splittersOutput transformerAudio power amplifier
A wide bandwidth, high power amplifier system for amplifying a signal in a radio frequency (RF) system in a specific bandwidth within the frequency range from 1 MHz to 100 GHz. The system includes a number of amplifier modules and an equal number of input transformers connected in series, with each input transformer providing an input signal to one amplifier module. It also includes an equal number of output transformers connected in series with each output transformer receiving an input signal from one amplifier module. The series of input transformers, the series of output transformers and the amplifier modules each provide an impedance matched approximately to the impedance of the RF system.
Owner:TREX ENTERPRISES CORP
Chopper stabilized amplifier with synchronous switched capacitor noise filtering
ActiveUS9473074B1Reduce noiseReduce output noiseAmplifier modifications to reduce noise influenceAmplifier modifications to raise efficiencyCapacitanceSoftware engineering
A chopper stabilized amplifier with synchronous switched capacitor noise filtering is disclosed. In an exemplary embodiment, an apparatus includes a chopper amplifier having an input that receives an input signal and an output that outputs an amplified signal. The chopper amplifier includes an input chopping circuit and an output chopping circuit, where the input and output chopping circuits operate in response to a chop clock. The apparatus also includes a switched capacitor filter having an input that receives the amplified signal and an output that outputs a filtered signal. The switched capacitor filter operates in response to a filter clock. The apparatus also includes a filter timing adjuster that receives a reference voltage and adjusts a phase of the filter clock with respect to the chop clock to reduce chopper noise on that reference voltage.
Owner:LITTELFUSE INC
Digital self-calibration chopper precision amplifier and implementation method
PendingCN107241067ALower Input Offset VoltageSmall output rippleAmplifier modifications to reduce noise influenceAmplifier modifications to reduce temperature/voltage variationDigital analog converterSoftware engineering
The invention provides a high-performance digital self-calibration chopper precision amplifier which is low in cost and easy to implement and an implementation method. The amplifier mainly comprises a digital self-calibration loop and a chopper circuit. After the amplifier is energized, the amplifier is configured as a digital self-calibration state within a period of time, and the chopper circuit and an amplifier output circuit are switched off. The calibrated digital quantity is stored in a register, and input offset voltage of the amplifier is calibrated through a digital analog converter. After the digital self-calibration state is finished, a comparison output circuit is switched off, the amplifier is configured as a chopper magnifying state, and the chopper circuit and the amplifier output circuit work, so that the input offset voltage of the amplifier, temperature drift of the offset voltage and flicker noise are lowered.
Owner:LINEARIN TECH CORP
Low-noise high-input impedance amplifier applied to wearable dry electrode electrocardio monitoring
PendingCN110212873ADoes not reduce input impedanceReduce noiseAmplifier modifications to reduce noise influenceAmplifier combinationsHigh resistanceEcg signal
The invention discloses a low-noise high-input impedance amplifier applied to wearable dry electrode electrocardio monitoring. The amplifier circuit adopts a novel chopping stabilization technology, so that the flickering noise of the circuit is reduced, and an ultralow-frequency electrocardiosignal can be effectively amplified; meanwhile, a sampling input structure is adopted, it is guaranteed that the input impedance of the amplifier is not reduced while the chopping stabilization technology is used, electrocardiosignals can be effectively obtained from high-resistance dry electrodes, and application of wearable dry electrode electrocardio examination is facilitated; an electrode offset suppression circuit adjusted by digital-analog mixing is adopted, so that the noise of the whole circuit is not increased while the + / -300mV electrode offset suppression capability is provided; and a rapid recovery circuit is adopted, so that the recovery time of the electrode imbalance inhibition loop is prolonged, the application of all-weather continuous electrocardiogram detection is facilitated, and a good solution is provided for the Internet of Things plus medical treatment.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Transformer-capacitor enhancement circuitry for power amplifiers
ActiveUS20090295475A1Increase operating voltageHigh impedanceAmplifier modifications to reduce non-linear distortionGain controlAudio power amplifierTransformer
Circuitry for providing improved pulse-type enhancement of the voltage supplied to a power amplifier (101) that is fed by a power supply that is connected to the power amplifier (101) at a feeding point through a main supply path that is connected via an inductor (L1). A second feeding point is used for enhancement by a capacitor that is discharged. A transformer L2, L3, M) is formed by mutually coupling an additional inductor (L3), through which an additional supply path is connected. Enhancement power is provided partially through the transformer L2, L3, M) and the remaining part thorough the capacitor (C1). This way, the total level of possible enhancement is increased, while minimizing distortion of the envelope of the amplified RF signal.
Owner:QUALCOMM INC
Signal detecting circuit
ActiveUS7570044B2Amplifier modifications to reduce noise influenceElectrical measurement instrument detailsAudio power amplifierElectrical polarity
Owner:KK TOSHIBA
Fast settling capacitive gain amplifier circuit
ActiveUS20180076780A1Analogue/digital conversionAmplifier modifications to reduce non-linear distortionCapacitanceAudio power amplifier
A capacitive gain amplifier circuit amplifies an input signal by a pair of differential amplifier circuits couples in series. The first differential amplifier circuit is reset during an autozero phase while disconnected from the second differential amplifier circuit, and the first and second differential amplifier circuits are connected together in series during a chop phase. A set of feedback capacitors is selectively switched in between respective outputs of the second differential amplifier circuit and respective inputs of the first differential amplifier circuit during the chop phase.
Owner:ANALOG DEVICES INT UNLTD
A chopper amplification circuit adopting a negative impedance compensation technology
ActiveCN109921755AThe equivalent input capacitance value decreasesAdding input capacitanceNegative-feedback-circuit arrangementsAmplifier modifications to reduce noise influenceCapacitanceNegative feedback
The invention discloses a chopper amplification circuit adopting a negative impedance compensation technology. The chopper amplification circuit comprises a differential input end, a first-stage chopper switch, a first-stage amplification circuit, a second-stage chopper switch, a second-stage amplification circuit, a negative impedance conversion circuit, a negative feedback unit, an input capacitor and a differential output end, the differential input end is connected with the first-stage chopper switch and is used for accessing a differential voltage signal; an output terminal of the first-stage chopper switch is connected with the first-stage amplifying circuit through an input capacitor; the first-stage amplification circuit is connected with the second-stage chopper switch, the second-stage chopper switch is connected with the second-stage amplification circuit, and the second-stage amplification circuit is connected with the differential output end and is further connected with the feedback input end of the first-stage amplification circuit through the negative feedback unit, and the negative impedance conversion circuit is connected to the signal input end of the first-stageamplification circuit in parallel for reducing the equivalent input capacitance of the first-stage amplification circuit. The circuit has the advantages of high input impedance and high stability, and can be suitable for occasions requiring high input impedance.
Owner:SOUTH CHINA UNIV OF TECH
Transformer-capacitor enhancement circuitry for power amplifiers
ActiveUS7710203B2Amplifier modifications to reduce non-linear distortionGain controlAudio power amplifierTransformer
Circuitry for providing improved pulse-type enhancement of the voltage supplied to a power amplifier (101) that is fed by a power supply that is connected to the power amplifier (101) at a feeding point through a main supply path that is connected via an inductor (L1). A second feeding point is used for enhancement by a capacitor that is discharged. A transformer L2, L3, M) is formed by mutually coupling an additional inductor (L3), through which an additional supply path is connected. Enhancement power is provided partially through the transformer L2, L3, M) and the remaining part thorough the capacitor (C1). This way, the total level of possible enhancement is increased, while minimizing distortion of the envelope of the amplified RF signal.
Owner:QUALCOMM INC
Pseudo-random chopper amplifier
ActiveUS20160380598A1Reduce chopping artifactReduce artifactsElectroencephalographyElectrocardiographyAudio power amplifierChopper amplifier
A chopper stabilized amplifier that utilizes a multi-frequency chopping signal to reduce chopping artifacts. By utilizing a multi-frequency chopping signal, the amplifier DC offset and flicker noise are translated to the higher chopping frequencies but are also smeared, or spread out in frequency and consequently lowered in amplitude. This lower amplitude signal allows for less stringent filtering requirements.
Owner:CIRTEC MEDICAL CORP
Low input bias current chopping switch circuit and method
ActiveUS20110316621A1Amplifiers using switched capacitorsNegative-feedback-circuit arrangementsSignal conditioning circuitsHarmonic
A chopper-stabilized circuit (1) includes pre-chopping circuitry (26) for chopping an input signal (Vin) at a first frequency to generate a first signal. Input chopping circuitry (9) chops the first signal at a second frequency substantially greater than the first frequency to produce a second signal. The first frequency is a sub-harmonic of the second frequency. Post-chopping circuitry (30) chops the second chopped signal at the first frequency to produce a third signal that is applied to an input of a signal conditioning circuit (2). The output chopping circuitry (10) chops an output of the signal conditioning circuit at the second frequency to generate a fourth signal. The fourth signal is filtered.
Owner:TEXAS INSTR INC
Switched-capacitor bandgap reference circuit using chopping technique
InactiveCN106647906AAmplifier with semiconductor-devices/discharge-tubesDC-isolation amplifierEngineeringReference circuit
The method relates to a switched-capacitor bandgap reference circuit using chopping technique. A method includes providing a first voltage to a first output node during a first time interval, providing a second voltage to the first output node during a second time interval, and averaging the first and second voltages to provide a reference voltage to a second output node. The first voltage includes a proportional-to-absolute-temperature (PTAT) component, a complementary-to-absolute-temperature (CTAT) component, and a first residual offset component. The second voltage includes the PTAT component, the CTAT component, and a second residual offset component. An apparatus includes a discrete-time circuit to provide the first voltage to the first output node during the first time interval and to provide the second voltage to the first output node during the second time interval, and a filter to average the first and second voltages to provide the reference voltage to the second output node.
Owner:MARVELL WORLD TRADE LTD
An active electrode having a closed-loop unit-gain amplifier with chopper modulation
ActiveCN107106013AImprove CMRRHigh input impedanceAmplifier modifications to reduce noise influenceGain controlElectricityAudio power amplifier
An active electrode has an electrode for sensing an electric potential and generating an input signal, and a shield placed near said electrode but being electric insulated from the electrode. An integrated amplifier (10) has an input connected to the at least one electrode for receiving the input signal, and providing a buffered path outputting a buffered output signal. The shield being connected to said output of the integrated amplifier to actively drive the electrical potential of said shield, thereby providing an active shielding of said electrode. The buffered path includes a first mixer (11) in front of the integrated amplifier for frequency shifting the input signal from a basic frequency range to a higher frequency range, and a second mixer (12) on the output of the integrated amplifier for frequency shifting the amplified signal from said higher frequency range back to said basic frequency range. The active electrode may be used for recording EEG signals.
Owner:T&W ENG
Single stage switching power amplifier with bidirectional energy flow
ActiveUS20140159809A1Afford useImprove system efficiencyPower amplifiersAmplifier modifications to raise efficiencyDriver circuitSingle stage
A switching amplifier realizes bidirectional energy flow and combines switching and power amplification into one single stage so as to increase system efficiency. The modulator circuit of the amplifier receives and modulates an input signal, and generates and outputs modulated driver signals, which are used by the power driver circuit to generate signals to drive switching transformers of an amplifier circuit of the amplifier, and control signals, which are used to control an output generator circuit so as to allow individual inductors across the load by enabling current flowing through the load to have a path to ground. The amplifier circuit comprises switching transformers as well as circuitries configured to capture energy returned from the load and enable the captured energy to flow back to a power supply circuit of the amplifier through an energy flow-back circuit of the amplifier.
Owner:GUANGDONG RUI DING ELECTRICAL TECH
Power amplifier having input ends combined in series and output ends combined in series
ActiveUS20090115529A1Negative-feedback-circuit arrangementsHigh frequency amplifiersAudio power amplifierTransformer
A power amplifier includes a first transformer, a first transistor, a first resistor, a second transformer, a second transistor, a second resistor, and a bias circuit. The first transformer drives the first transistor. The second transformer drives the second transistor. The first transformer is connected in series with the second transformer. The first transistor is connected in series with the second transistor. Therefore, the power amplifier has input impedance and output power both greater than those of a conventional power amplifier.
Owner:NAT TAIWAN UNIV
Isolation amplifier with high linearity
InactiveCN109546971AThe output signal has no effect onOutput signal influenceAmplifier modifications to reduce non-linear distortionDC-isolation amplifierNegative feedbackAudio power amplifier
The invention discloses an isolation amplifier with high linearity. The isolation amplifier comprises an input amplifier circuit A, an operational amplifier B, a modulator C, a demodulator D and a transformer T1. An input signal Vin is connected with an input end of the input amplifier circuit A. An output end of the input amplifier circuit A is connected with a center tap on a primary winding ofthe transformer T1. Two ends of the primary winding of the transformer T1 are connected with the modulator C. Two ends of a secondary winding of the transformer T1 are connected with the demodulator D. The modulator C and the demodulator D are connected with a clock module at the same time. The center tap of the secondary winding of the transformer T1 is connected with an inverted input end of theoperational amplifier B. A positive phase input end of the operational amplifier B is grounded. The output end of the operational amplifier B is connected with the inverted input end of the operational amplifier B through utilization of a negative feedback resistor R14. When the isolation amplifier is applied, signals can be received in a relatively wide dynamic range, and moreover, very high linearity is kept.
Owner:MIANYANG WEIBO ELECTRONICS
Instrument amplifier
ActiveCN105490649AReduce usageOvercome stabilityAmplifier modifications to reduce noise influenceDC-isolation amplifierCapacitanceInstrumentation amplifier
The application discloses an instrument amplifier comprising a capacitance feedback structure closed loop amplifier, an input capacitor charging module, a feedback capacitor discharge module, a noise separating module and a logic controller; the capacitance feedback structure closed loop amplifier comprises a full differential operational amplifier, a first input capacitor, a second input capacitor, a first feedback capacitor and a second feedback capacitor; the input capacitor charging module is used for periodically charging the first and second input capacitors; the feedback capacitor discharge module is used for periodically discharging the first and second feedback capacitors; the noise separating module is used for separating signals from noises through the chopper modulation technology; the logic controller is respectively connected with the input capacitor charging module, the feedback capacitor discharging module and the noise separating module so as to control each module to work, thus reducing instrument amplifier power consumption, and reducing instrument amplifier noises and cost.
Owner:HANGZHOU VANGO TECH
Low noise amplifier circuit
A semiconductor circuit comprising an input block having a first chopper providing a chopped voltage signal, a first transconductance converting said chopped voltage signal into a chopped current signal, a second chopper providing a demodulated current signal, a current integrator having an integrating capacitor providing a continuous-time signal, a first feedback path comprising: a sample-and-hold block and a first feedback block, the first feedback path providing a proportional feedback signal upstream of the current integrator. The amplification factor is at least 2. Charge stored on the integrating capacitor at the beginning of a sample period is linearly removed during one single sampling period. Each chopper operates at a chopping frequency. The sample-and-hold-block operates at a sampling frequency equal to an integer times the chopping frequency.
Owner:MELEXIS TECH NV
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