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79results about "Amplifiers with multiple amplifying elements" patented technology
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Stacked RF power amplifier
A method and apparatus provides techniques for electrically isolating switching devices in a stacked RF power amplifier, which prevents the switching devices from being subjected to high breakdown voltages. The isolation provided allows the power amplifier to be implemented on an integrated circuit.
Owner:QUALCOMM INC
Multi-cascode transistors
InactiveUS6888396B2Boards/switchyards circuit arrangementsAmplifier modifications to reduce detrimental impedenceMOSFETCascode
A cascode circuit with improved withstand voltage is provided. The cascode circuit includes three or more transistors, such as MOSFET transistors. Each transistor has a control terminal, such as a gate, and two conduction terminals, such as a drain and a source. The conduction terminals are coupled in series between two output terminals, such as where the drain of each transistor is coupled to the source of another transistor. A signal input is provided to the gate for the first transistor. Two or more control voltage sources, such as DC bias voltages, are provided to the gate of the remaining transistors. The DC bias voltages are selected so as to maintain the voltage across each transistor to a level below a breakdown voltage level.
Owner:CALIFORNIA INST OF TECH
Stacked RF power amplifier
A method and apparatus provides techniques for electrically isolating switching devices in a stacked RF power amplifier, which prevents the switching devices from being subjected to high breakdown voltages. The isolation provided allows the power amplifier to be implemented on an integrated circuit.
Owner:QUALCOMM INC
Bipolar stacked transistor architecture
ActiveUS20120242410A1Avoid failureNegative feedbackNegative-feedback-circuit arrangementsHigh frequency amplifiersAudio power amplifierHarmonic
An amplifier for an integrated circuit has a plurality of ratioed current mirrors connected to each other in a stacked configuration. Each ratio mirror has at least two resistors and at least two bipolar transistors connected to each other via said at least two resistors. Each amplifying transistor, contains a capacitor, and potentially and inductor, to internally match the transistors that make up the amplifying stack. DC, harmonic and s-parameter simulations are performed to provide an optimal impedance for each of the stacked transistors to maximize the RF power output of each stacked layer and the amplifier.
Owner:GEORGE WASHINGTON UNIVERSITY +1
Method and apparatus for improved clock preamplifier with low jitter
ActiveUS7345528B2Avoid saturationControl swingAmplififers with field-effect devicesArbitary function generatorsMOSFETPower inverter
A clock signal preamplifier comprises complementary pairs of differentially coupled transistors, with an output signal coupled to an inverter further comprising a totem-pole arrangement of complementary MOSFET transistors. The input signal to the preamplifier is typically sinusoidal, and the output signal is rectangular. Preferably, the differentially coupled transistors are bipolar, and a pair of diode clamper circuits with bipolar transistors is preferably coupled to the complementary pairs of differentially coupled transistors. A reference voltage source is coupled to the control terminals of the clamper transistors. A reference voltage source, which preferably comprises a totem-pole arrangement of complementary MOSFET transistors with its output node is coupled to its input node, provides a reference voltage for the diode clamper circuits. Preferably, MOSFET transistors of the reference voltage source and MOSFET transistors of like kind of the inverter are configured to have substantially identical threshold voltages.
Owner:TEXAS INSTR INC
Front-end amplifier circuit based on magnetoelectric transducer made of relaxor ferroelectric material
InactiveCN101807891AImprove signal-to-noise ratioSuppress 50Hz strong industrial frequency interferenceAmplifiers with multiple amplifying elementsAudio power amplifierTransducer
The invention relates to a high-CMRR front-end amplifier unit circuit module with a magnetoelectric transducer made of a relaxor ferroelectric material, which can amplify a magnetoelectric signal and inhibit jamming from 50 Hz power frequency. The invention is characterized in that the output voltage signal of the magnetoelectric transducer made of relaxor ferroelectric material is initially amplified by the front-end amplifier, and the 50 Hz strong power frequency jamming is inhibited by utilizing the high CMRR feature of the front-end amplifier, thereby amplifying the differential small-signal and inhibiting the common-mode large-signal. The circuit modules are integrated on an integrated circuit chip; and after being connected with a detector, the integrated circuit chip can effectively read the signal of the relaxor ferroelectric detector.
Owner:NANTONG UNIVERSITY
Distributed circular geometry power amplifier architecture
InactiveUS7075371B2Reduce power lossLower resistancePush-pull amplifiersPhase-splittersMicrowaveAudio power amplifier
The present invention discloses a distributed power amplifier topology and device that efficiently and economically enhances the power output of an RF signal to be amplified. The power amplifier comprises a plurality of push-pull amplifiers interconnected in a novel circular geometry that preferably function as a first winding of an active transformer having signal inputs of adjacent amplification devices driven with an input signal of equal magnitude and opposite phase. The topology also discloses the use of a secondary winding that matches the geometry of primary winding and variations thereof that serve to efficiently combine the power of the individual power amplifiers. The novel architecture enables the design of low-cost, fully-integrated, high-power amplifiers in the RF, microwave, and millimeter-wave frequencies.
Owner:CALIFORNIA INST OF TECH
Distributed circular geometry power amplifier architecture
InactiveUS20050030098A1Reduce power lossLower resistancePush-pull amplifiersPhase-splittersAudio power amplifierTransformer
The present invention discloses a distributed power amplifier topology and device that efficiently and economically enhances the power output of an RF signal to be amplified. The power amplifier comprises a plurality of push-pull amplifiers interconnected in a novel circular geometry that preferably function as a first winding of an active transformer having signal inputs of adjacent amplification devices driven with an input signal of equal magnitude and opposite phase. The topology also discloses the use of a secondary winding that matches the geometry of primary winding and variations thereof that serve to efficiently combine the power of the individual power amplifiers. The novel architecture enables the design of low-cost, fully-integrated, high-power amplifiers in the RF, microwave, and millimeter-wave frequencies.
Owner:CALIFORNIA INST OF TECH
Linear amplifier and its high power pulse power source
ActiveCN101072013AImprove stabilityHigh precisionAmplifiers with multiple amplifying elementsEngineeringElectron
The invention is related to linear amplifier (LA), and high power pulse electrical source (HPPES). LA uses power unit IGBT as linear unit. HPPES uses LA. LA is composed of two operational amplifiers, one power unit IGBT, and a non-inductive resistance. HPPES consists of a main current source, two current sources I1 and I2, two controllable voltages, three capacitors, switch K, diode D, inductance L, and non-inductive current limiting resistance. Whole circuit forms controllable linear current source with good tracking performance, and characteristic of constant current source. Using variable supply power, HPPES lowers wastage of power unit so as to raise efficiency of system.
Owner:XINFENGGUANG ELECTRONICS TECH CO LTD
Ultra-low power high-speed current sampling circuit
ActiveCN110244095AImprove transient response speedQuick responsePower reduction in field effect transistorsTransistorEngineeringUltra low power
An ultra-low power high-speed current sampling circuit belongs to the technical field of power management circuits. The current sampling circuit comprises a sampling module and an auxiliary clamping module, wherein the sampling module comprises an operational amplifier and a first NMOS transistor, the gate of the first NMOS transistor is connected to the gate of a power tube, the drain thereof is connected to the drain of the power tube and connected to the power supply voltage, and the source thereof is connected to the negative input terminal of the operational amplifier; the positive input terminal of the operational amplifier is connected to the source of the power tube, and the voltage of the output terminal of the operational amplifier returns to the negative input terminal of the operational amplifier through a feedback loop; the auxiliary clamp module sets upper and lower limits for the output voltage of the operational amplifier, the voltage clamp is used to accelerate the transient process from the disabled state to the enabled state, and an ultra-low power current sampling circuit with fast response speed is realized combined with the wide bandwidth. The invention also proposes an operational amplifier with a wide bandwidth to further accelerate the transient response of the current sampling circuit.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Amplifier stage
InactiveUS7911280B2Eliminate the effects ofAvoid couplingHigh frequency amplifiersLow frequency amplifiersAudio power amplifierEngineering
Owner:SONY ERICSSON MOBILE COMM AB
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
Amplifier stage
InactiveUS20110006845A1Eliminating Miller effectGood backwards isolation propertyHigh frequency amplifiersLow frequency amplifiersAudio power amplifierEngineering
Owner:SONY ERICSSON MOBILE COMM AB
Method and apparatus for improved clock preamplifier with low jitter
ActiveUS20060255859A1Rapid waveformLittle added timing jitterAmplififers with field-effect devicesArbitary function generatorsMOSFETAudio power amplifier
A clock signal preamplifier comprises complementary pairs of differentially coupled transistors, with an output signal coupled to an inverter further comprising a totem-pole arrangement of complementary MOSFET transistors. The input signal to the preamplifier is typically sinusoidal, and the output signal is rectangular. Preferably, the differentially coupled transistors are bipolar, and a pair of diode damper circuits with bipolar transistors is preferably coupled to the complementary pairs of differentially coupled transistors. A reference voltage source is coupled to the control terminals of the damper transistors. A reference voltage source, which preferably comprises a totem-pole arrangement of complementary MOSFET transistors with its output node is coupled to its input node, provides a reference voltage for the diode damper circuits. Preferably, MOSFET transistors of the reference voltage source and MOSFET transistors of like kind of the inverter are configured to have substantially identical threshold voltages.
Owner:TEXAS INSTR INC
Receiver circuit having compensated offset voltage
InactiveUS20080061840A1Avoid failurePulse automatic controlCurrent/voltage measurementAudio power amplifierControl signal
A receiver circuit includes an offset control signal generating unit that outputs a plurality of offset control signals using an offset voltage. A sense amplifier receives a first current and a second current generated on the basis of an up input signal and a down input signal, respectively, converts the first current and the second current into an up compensating signal and a down compensating signal having electric potentials compensating the offset voltage, and amplifies the up compensating signal and the down compensating signal to output an up output signal and a down output signal.
Owner:SK HYNIX INC
Small signal amplifier with large signal output boost stage
ActiveUS20060164170A1Simplifying its biasingLow power operationNegative-feedback-circuit arrangementsAmplifiers with impedence circuitsAudio power amplifierEngineering
A small signal amplifier with a large signal output boost stage are connected between first and second supply rails. The small signal amplifier receives first and second input signals and provides an output signal at an output node which drives a load. Under small signal conditions, the output signal varies approximately linearly with the difference voltage. However, under large signal conditions, a rail-to-rail large signal output boost stage connected to the output node is arranged to drive the output node close to the first or second supply rail as needed to provide the current demanded by the load. The large signal output boost stage is off in small signal conditions, but comes on rapidly and transfers maximum charge to the load under large signal conditions.
Owner:ANALOG DEVICES INC
Bipolar stacked transistor architecture
ActiveUS8791759B2Avoid failureNegative feedbackNegative-feedback-circuit arrangementsHigh frequency amplifiersAudio power amplifierHarmonic
Owner:GEORGE WASHINGTON UNIVERSITY +1
Bias voltage forming circuit, amplifying circuit, streamline type AD adaptor
InactiveCN1533026AAmplifier modifications to raise efficiencyAnalogue-digital convertersCMOSEngineering
Owner:SANYO ELECTRIC CO LTD
A Hall signal amplify circuit
PendingCN109067367AAmplifier modifications to reduce temperature/voltage variationDifferential amplifiersAudio power amplifierEquivalent input
A Hall signal amplify circuit includes a Hall sensor module connected to a power supply, first amplifier, second amplifier, third amplifier, compensation module, a first output of the Hall sensor module is connected to a non-inverting input of the first amplifier, a second output of the Hall sensor module is connected to an inverting input of the first amplifier, the non-inverting output terminalof the first amplifier is respectively connected with the non-inverting output terminal of the second amplifier and the non-inverting input terminal of the third amplifier. The inverting output terminal of the first amplifier is respectively connected with the inverting output terminal of the second amplifier and the inverting input terminal of the third amplifier, the first output terminal of thecompensation module is connected with the non-inverting input terminal of the second amplifier, and the second output terminal of the compensation module is connected with the inverting input terminal of the second amplifier. The invention generates the equivalent input offset voltage related to the thermal voltage through the compensation module, and has good temperature compensation function while eliminating the operational amplifier offset voltage.
Owner:BCD (SHANGHAI) MICRO ELECTRONICS LTD
Driving circuit with high speed and large output swing
InactiveCN107819445AHigh bandwidthIncrease resistanceAmplifiers with multiple amplifying elementsAmplifier modifications to extend bandwidthAudio power amplifierEngineering
The invention discloses a driving circuit with high speed and large output swing. The driving circuit comprises a first-stage emitter follower circuit used for level displacement and impedance matching, and a second-stage differential structure grounded emitter amplifier circuit used for amplifying an input signal and providing a sufficient bandwidth, wherein the first-stage emitter follower circuit comprises an emitter follower formed by Q1 and Q2, a bias current source, an impedance matching resistor R1 and an impedance matching resistor R2; the bias current source is of a parallel structureof M1 and M4 which adopt a diode connection mode and M2 and M3 which are crossly coupled; the second-stage differential structure grounded emitter amplifier circuit comprises a main amplifier tube Q3and a main amplifier tube Q4 of a grounded emitter amplifier of the differential structure, and a large-resistance driving source electrode follower which is formed by R3 / M5 and R4 / M6 and has an inductance characteristic. The MOS tubes adopting the diode connection mode and the MOS tubes which are crossly coupled are connected in parallel, and an MOS device whose grid electrode has large resistance forms an active inductor, the formed driving circuit has the advantages of high speed and large output swing, the gain is improved, the linearity is improved, the circuit bandwidth is expanded, thechip area is saved, and the cost is reduced.
Owner:HUBEI UNIV
Reading device for current type touch panel
InactiveCN102023737AReduce usageReduce areaApparatus without intermediate ac conversionInput/output processes for data processingAnalog-to-digital converterTouch panel
The invention discloses a reading device for a current type touch panel. The reading device comprises a current-to-voltage conversion unit, a voltage gain unit and an analog-digital converter, wherein the current-to-voltage conversion unit converts the sensing current of the current type touch panel into sensing voltage; an input end of the voltage gain unit is coupled to an output end of the current-to-voltage conversion unit so as to receive the sensing voltage; and an input end of the analog-digital converter is coupled to an output end of the voltage gain unit, and an output end of the analog-digital converter generates digital codes.
Owner:HIMAX TECH LTD
Weak-light-signal multistage amplifying circuit
ActiveCN106788293AHigh signal-to-noise ratio and effectiveAmplifier modifications to reduce noise influencePhotometry electrical circuitsVoltage pulsePhotovoltaic detectors
Owner:NANCHANG UNIV
Stacked RF power amplifier
InactiveUS20060226905A1High frequency amplifiersPower amplifiersAudio power amplifierBreakdown voltage
A method and apparatus provides techniques for electrically isolating switching devices in a stacked RF power amplifier, which prevents the switching devices from being subjected to high breakdown voltages. The isolation provided allows the power amplifier to be implemented on an integrated circuit.
Owner:QUALCOMM INC
Radio frequency ultra wide band-driven amplifier chip
PendingCN110798162AIncrease phase desireImprove linearityGain controlAmplifiers with multiple amplifying elementsUltra-widebandCapacitance
The invention discloses a radio frequency ultra wide band-driven amplifier chip which comprises two input resistors, two feedback resistors and an operational amplifier. The operational amplifier comprises three amplifiers including a first-stage amplifier, a second-stage amplifier and a third-stage amplifier, the two common-mode feedback circuits comprise a first-stage common-mode feedback circuit and a second-stage common-mode feedback circuit; wherein the first-stage amplifier and the second-stage amplifier are in direct-current coupling, the input end of the third-stage amplifier is connected with the input end of the first-stage amplifier, and the output end of the third-stage amplifier is connected with the output end of the second-stage amplifier to form a feedforward structure; according to the invention, high bandwidth and linearity can be realized, and compared with a traditional two-stage or three-stage amplifier with a compensation capacitor Cc, the amplifier provided by the invention is more suitable for a resistance feedback structure and can realize better performance.
Owner:XIAN BORUI JIXIN ELECTRONICS TECH
Small signal amplifier with large signal output boost stage
ActiveUS7288993B2Simplifying its biasingLow power operationNegative-feedback-circuit arrangementsAmplifiers with impedence circuitsAudio power amplifierSignal amplifier
A small signal amplifier with a large signal output boost stage are connected between first and second supply rails. The small signal amplifier receives first and second input signals and provides an output signal at an output node which drives a load. Under small signal conditions, the output signal varies approximately linearly with the difference voltage. However, under large signal conditions, a rail-to-rail large signal output boost stage connected to the output node is arranged to drive the output node close to the first or second supply rail as needed to provide the current demanded by the load. The large signal output boost stage is off in small signal conditions, but comes on rapidly and transfers maximum charge to the load under large signal conditions.
Owner:ANALOG DEVICES INC
Stacked power amplifiers using core devices
A power amplifier includes an input terminal configured to receive a low voltage input signal, an output terminal configured to output a high voltage output signal, and a plurality of amplifiers stacked in series between a first voltage terminal and a second voltage terminal. Each of the amplifiers includes an input capacitor, an output capacitor, an input coupled to the input terminal through the input capacitor, an output coupled to the output terminal through the output capacitor, and a feedback element coupled between the input and the output of the amplifier.
Owner:SHENZHEN GOODIX TECH CO LTD
Methods and apparatus for an amplifier integrated circuit
ActiveUS10686418B1Low and high gain bandwidth productLow gain bandwidthAmplifier modifications to reduce noise influenceGain controlSoftware engineeringMechanical engineering
Various embodiments of the present technology may provide methods and apparatus for an amplifier integrated circuit. The amplifier integrated circuit may provide a low gain bandwidth product to amplify at a higher speed and a high gain bandwidth product to amplify at a lower speed. The amplifier integrated circuit may achieve the low and high gain bandwidth product by generating a first current and a second current through a plurality of sets of series-connected transistors and operating a plurality of switches.
Owner:SEMICON COMPONENTS IND LLC
Low noise, low distortion RF amplifier topology
InactiveUS6400229B1Negative-feedback-circuit arrangementsAmplifier combinationsLow noiseLow distortion
A low noise, low distortion radio frequency amplifier which includes a bootstrap design to minimize intermodulation distortion while simultaneously achieving low noise and wide bandwidth. In the illustrative embodiment, the invention includes a first circuit for receiving an input signal; a second circuit for amplifying the input signal using a transistor Q2; and a third circuit for regulating a rate of change of voltage across the transistor Q2 such that the rate of voltage change is zero. The third circuit includes a transistor Q3 connected to the transistor Q2 in cascode. In the specific illustrative embodiment, the third circuit further includes two diodes D1 and D2 used to modulate the voltage at the input of the transistor Q3 in proportion to the voltage modulation at the input of the transistor Q2. In the illustrative embodiment, the second circuit includes a transistor Q1 connected in cascade to the transistor Q2. In the specific illustrative embodiment, the invention further includes a fourth circuit for regulating a rate of change of voltage across the transistor Q1 such that the rate of voltage change is zero. The fourth circuit includes a transistor Q4 connected to the transistor Q1 in cascode. The two diodes D1 and D2 also connect the transistors Q1 and Q4 such that the voltage at the input of the transistor Q4 is modulated in proportion to the voltage modulation at the input of the transistor Q1.
Owner:MICROELECTRONICS TECH INC
Integrated circuit devices having a control circuit for biasing an amplifier output stage and methods of operating the same
ActiveCN1801602AGated amplifiersAmplifier modifications to raise efficiencyDriver circuitAudio power amplifier
An integrated circuit device includes an amplifier circuit that generates an output voltage. A bias control circuit is configured to generate a bias control voltage or the output voltage at an output thereof based on a state of a control signal. An output stage driver circuit that is responsive to the voltage generated at the output of the bias control circuit.
Owner:SAMSUNG ELECTRONICS CO LTD
Operational amplifier controlled animation display conductivity test instrument
InactiveCN110277008AIncrease terminal voltageLower resistanceEducational modelsAmplifiers with multiple amplifying elementsOvervoltageAudio power amplifier
The invention relates to an operational amplifier controlled animation display conductivity test instrument, belonging to the demonstration field of teaching instruments. The animation display conductivity test instrument is composed of a test rod, a test clamp, tester jacks, a first-stage amplification unit, a second-stage operational amplification unit, an oscillation unit, a sound unit, a pushing unit, a zeroing unit, a light color display unit, an image effect unit and a quick-break protection adjustable power supply. A power supply for starting quick-break protection during overvoltage is arranged to protect stability of test instrument. When a tested electronic element is inserted into the tester jacks, according to the characteristics of object conductivity, the tested electronic element is amplified by the first-stage amplification unit and then enters an in-phase input end of a comparison amplifier in the second-stage operational amplifier unit, output is generated on the basis of the intensity of input signals, the sound unit is started to emit sound and also the pushing unit is excited to act, the light color display unit generates light display, animation images are formed, and then visual animation display and a voice effect are achieved. The operational amplifier controlled animation display conductivity test instrument is quite interesting, and can arouse the interest of teenagers to increase the love for science.
Owner:谢懿
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