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8085175 |
Linearizer
The present invention provides an advanced adaptive predistortion linearization technique to dramatically reduce nonlinear distortion in power amplifiers over a very wide instantaneous bandwidth...
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7952427 |
Signal amplifier circuit and optical receiver
A signal amplifier circuit includes peak value holding circuit 11 receiving positive-phase input signal, peak value holding circuit 12 receiving negative-phase input signal, adder 13 adding the...
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7876152 |
High-impedance level-shifting amplifier capable of handling input signals with a voltage magnitude that exceeds a supply voltage
A level-shifting amplifier is provided for level-shifting an input signal with a voltage magnitude that exceeds a supply voltage of the amplifier. In operation, the amplifier has an input impedance...
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7855598 |
Electronic signal processor
An electronic signal processor for processing signals includes a complex first filter, one or more gain stages and a second filter. The first filter is characterized by a frequency response curve...
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7800439 |
High speed preamplifier circuit, detection electronics, and radiation detection systems therefrom
A preamplifier circuit for processing a signal provided by a radiation detector includes a transimpedance amplifier coupled to receive a current signal from a detector and generate a voltage signal...
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7733174 |
Feedback controlled power limiting for signal amplifiers
An apparatus is provided. The apparatus includes an amplifier, differential amplifiers, and FETs. The amplifier has an intermediate node and an output node, and the amplifier is adapted to receive...
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7702301 |
Method and apparatus for distortion correction of RF amplifiers
A method of reducing distortion in the output of an amplifier is provided. The method comprises subtractively combining an error signals with the appropriate phase shift with input signals to be...
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7667176 |
Readout technique for increasing or maintaining dynamic range in image sensors
The apparatus and method provide a readout technique and circuit for increasing or maintaining dynamic range of an image sensor. The readout technique and circuit process each pixel individually...
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7547889 |
Photon detection device
The present invention discloses a photon detection device that is adapted to detect at least one packet of photons. The photon detection device may include a photon-sensitive element having an...
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7511572 |
High-impedance level-shifting amplifier capable of handling input signals with a voltage magnitude that exceeds a supply voltage
A level-shifting amplifier is provided for level-shifting an input signal with a voltage magnitude that exceeds a supply voltage of the amplifier. In operation, the amplifier has an input impedance...
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7492221 |
Power conversion regulator with exponentiating feedback loop
A feedback control loop around a gain element controls the output signal of said gain element responsive to an input or reference signal, and is additionally responsive to a non-linear feedback...
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7459972 |
Amplifiers with compensation
An amplifier system includes a first amplifier, a second amplifier, a first capacitance, and a first transistor. The first amplifier has an input and an output. The second amplifier has an input...
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7449670 |
Amplifier circuit and optical pickup device
An amplifier circuit according to the present invention includes: a first operational amplifier having a negative input terminal, a positive input terminal, and an output terminal; a photodiode...
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7332971 |
Multi-gigabit/s transimpedance amplifier for optical networks
A Gigabit/s transimpedance amplifier system includes a forward-path amplifier section with a very large bandwidth and an overall frequency-selective feedback section which is active only from DC to...
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7317351 |
Low noise amplifier
A low noise amplifier (LNA) is discussed. In implementations, a LNA may include a feedback section coupled to a transistor. The feedback section may have a resistive portion including a buffer and...
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7227246 |
Matching circuits on optoelectronic devices
An apparatus comprises a first substrate and a second substrate. The first substrate includes an optoelectronic device and a matching circuit. The second substrate includes a driver circuit. A...
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7205845 |
Amplifier circuit for converting the current signal from an optical receiving element into a voltage signal
An amplifier circuit for converting the current signal from an optical receiving element into a voltage signal. The amplifier circuit includes a transimpedance amplifier having a differential...
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7173487 |
Power amplification circuit and communication device using the same
A power amplification circuit, and a communication device using the same, which are capable of suppressing gain decreases of a power amplifier due to increases in input signal power in a state near...
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7126420 |
R.F. output power control
An R.F. power amplifier circuit comprising a power control loop is described. The power control loop includes an R.F. power amplifier having a power control input and a power supply input as well...
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7088393 |
Output-compensated buffers with source-follower input structure, methods of operating same, and image capture devices using same
An output-compensated buffer includes a buffer circuit that receives an input signal and produces an output signal responsive thereto at an output terminal, the buffer circuit including an input...
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7061313 |
Dual feedback linear amplifier
A dual feedback topology imparts stability to a multistage linear amplifier, particularly by improving overall amplifier phase margin at higher signal frequencies. With dual feedback, an inner...
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7046080 |
Signal processing circuit
A signal processing circuit comprises a difference stage for receiving an input signal to be processed and a feedback signal taken from an output signal of the circuit. The difference stage...
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7030702 |
Optical receiver with wide dynamic range transimpedance amplifier
An optical component, such as an optical receiver, is provided that includes a detector configured to receive a signal from an optical fiber and to communicate with a translationl module of the...
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6960754 |
Photoelectric current and voltage converting circuit
A photoelectric current and voltage converting circuit converts a photo current Ipd generated by the input to photo diode into a voltage Va by a feedback resistor connected to an inverting input...
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6900698 |
Negative feedback amplifier with electrostatic discharge protection circuit
A negative feedback amplifier which alleviates reduction in band width and effectively protects an amplifier from electrostatic discharge (ESD). A node is provided at the midpoint of a feedback...
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6876255 |
Linear amplifier using non-linear CMOS capacitors
The invention provides an amplifier circuit made by digital CMOS processes, the amplifier circuit comprising a main operational amplifier with at least one input and at least one output and a...
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6841771 |
Optical coupling device and light-receiving circuit of same
A light-receiving circuit of an optical coupling device may include a dummy photodiode arranged in a vicinity of a photodiode. The dummy photodiode and photodiode may convert received optical...
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6838936 |
Low-noise amplifier device having negative feedback via a controlled current source, and method of using the amplifier device
The amplifier device contains a first amplifier element having a first input and a first output. The first output is fed back via a negative feedback path to the input. The negative feedback path...
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6812788 |
Amplifying circuit
In signal sources having a high impedance, typically a capacitive “signal source” such as capacitor-microphone capsules, it is common practice to use amplifier circuits that include means for cou...
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6809589 |
Low voltage large swing/high linearity analog buffer with servo amplifier and feedback loop
An analog buffer with low harmonic distortion and low power supply voltage buffers a signal with wide voltage swing. The lower output voltage swing is increased, by adding a voltage level shifter...
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6720826 |
Transimpedance amplifier
A transimpedance amplifier system includes a first gain stage to receive an input signal. A second gain stage is coupled to the first gain stage to provide a first output. A first passive feedback...
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6693487 |
Signal processing circuit for floating signal sources using positive feedback
A signal processing circuit using positive feedback while keeping the open loop gain of the circuit less than 1 to avoid oscillation. The circuit includes a floating signal source, a low gain...
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6664858 |
Adjustable peaking capacitor in high-speed optical fiber communication receiver
A transimpedance amplifier for a high-speed optical fiber communication receiver includes an operational amplifier having a current input and developing a voltage output. A variable peaking...
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6624918 |
Voltage control of optical receiver bandwidth
An optical receiver is formed to include a digitally-controlled preamplifier that is used to adjust the bandwidth of the receiver. A measured bandwidth of the receiver is compared to a desired...
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6621341 |
Diagnostic medical ultrasound systems having a method and circuitry for front-end gain control
A system and method of processing received signals in an ultrasound imaging system is disclosed. In the system, the received signals are amplified by means of a gain controlled amplifier, and the...
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6614312 |
Low noise amplifier and imaging element using same
An imaging element that includes a photodiode and an amplifier for integrating photocurrent from the photodiode. The amplifier includes an input follower, a level shifter, and an output amplifier....
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6597245 |
Preamplifier
A preamplifier for use in an optical signal receiver is provided, which is capable of circumventing a problem of oscillation or shortage of bandwidth even in case an employed photodiode has a...
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6593811 |
Nonlinear feedback linearizer
The present invention relates generally to an amplifier such as that with the radio frequency (RF) spectrum having a nonlinear feedback loop to cancel out distortions in the input signal, and...
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6593810 |
2.5 Gigabits-per-second transimpedance amplifier
A transimpedance amplifier system includes a first gain stage to receive an input signal. A second gain stage is coupled to the first gain stage to provide a first output. A first passive feedback...
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6590455 |
Common-base amplifier with high input overload and/or tunable transimpedance
An apparatus comprising a common-base amplifier circuit and a control circuit. The amplifier circuit may be configured to generate an output signal having a transimpedance bandwidth in response to...
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6587003 |
Charge sensitive preamplifier with pulsed source reset
In a preferred embodiment, a charge sensitive preamplifier for a radiation detector, including: an amplifier having a JFET input (stage) and a capacitive feedback element, the amplifier producing...
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6552615 |
Method and system for compensation of low-frequency photodiode current in a transimpedance amplifier
A method and system to compensate for DC and low frequency current produced by a photodiode that is illuminated with an optical data stream is described. An optical data stream ideally produces no...
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6545544 |
Efficient high overdrive transimpedance amplifiers
Transimpedance amplifiers that provide moderate bandwidth and very large overdrive current capabilities while consuming a minimum amount of power supply current. Existing transimpedance amplifier...
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6515543 |
Circuit configuration for controlling nonlinear paths
An electrical circuit is provided for controlling nonlinear paths. A first linearization block and a second linearization block are provided, which may each have a characteristic curve that is the...
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6480179 |
Image display invention
An image display device has an image display section including an insulating substrate having a matrix of pixels formed on an inner surface thereof and a liquid crystal layer sandwiched between the...
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6459340 |
Power amplifier mismatch protection with clamping diodes in RF feedback circuit
A set of clamping diodes between terminals of a transistor acting as a power amplifier is configured to allow overvoltage at the output terminal of the transistor to travel through those clamping...
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6448860 |
Device for converting small currents impressed at the input of the device by a non-ideal electric source of current into voltage signals
A device for converting low currents, applied by a non-ideal current source to an input of the device, into voltage signals comprises a converter for converting the low currents into voltage...
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6433638 |
Fully balanced transimpedance amplifier for high speed and low voltage applications
A fully balanced transimpedance amplifier for high speed and low voltage applications is provided. An input stage of the amplifier uses a matched pair of common source connected transistors with...
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6404282 |
Preamplification circuit
According to a level of an input signal, first switching means performs control in such a way that only a first feedback resistor or the first and second feedback resistors become feedback...
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6384689 |
Preamplifier for optical receivers
In a preamplifier for optical receivers, the input of an inverting amplifier is connected to an input terminal, the output of the inverting amplifier is connected to the gate of a first transistor,...
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