54 results about "Wideband amplifiers" patented technology

High-speed silicon CMOS circuits and high-power AlGaN / GaN amplifiers are integrated on the same wafer. A thin layer of high resistivity silicon is bonded on a substrate. Following the bonding, an AlGaN / GaN structure is grown over the bonded silicon layer. A silicon nitride or a silicon oxide layer is then deposited over the AlGaN / GaN structure. Following this, a thin layer of silicon is bonded to the silicon nitride / silicon oxide layer. An area for the fabrication of AlGaN / GaN devices is defined, and the silicon is etched away from those areas. Following this, CMOS devices are fabricated on the silicon layer and AlGaN / GaN devices fabricated on the AlGaN / GaN surface.

The invention relates to the fields of quantum secret communication, weak ultrared detection, and the like, and provides an impulse gate-control low-pass filtering ultrared single-photon detector. Theimpulse gate-control low-pass filtering ultrared single-photon detector comprises an impulse gate-control power source, an In-Ga-As-In-P avalanche photodiode circuit, a DC voltage baising circuit, alow-pass filter, a high-speed wideband amplifier, a ultra-high-speed comparator and a counter, wherein gigahertz (GHz) impulse signals output by the impulse gate-control power source are used as gatecontrol signals of the In-Ga-As-In-P avalanche photodiode circuit, and spike noise signals caused by the junction capacitance differential effect of In-Ga-As-In-P avalanche photodiodes by the low-passfilter are used for filtering in a low-pass mode. The gigahertz impulse gate-control low-pass filtering ultrared single-photon detector solves the problem of spike noise interference in the prior art, increases the detection sensitivity of the avalanche signals and can be used for detecting GHz high-speed ultrared photon.

Doherty and distributed amplifier (DA) designs are combined to achieve, wideband amplifiers with high efficiency dynamic range. A modified Doherty amplifier includes a wideband phase shifter providing first and second outputs, a main amplifier coupled to the first output, an auxiliary amplifier coupled to the second output, and a wideband combining network combining the outputs in phase. A multi-stage DA has a main output and a termination port, and a phase delay module and transforming network allowing power at the termination port to be combined in phase with power at the main output. In one combination, one or more stages of the DA may comprise a Doherty amplifier. In another combination, a modified series-type Doherty amplifying system is achieved by cascading main and auxiliary DAs. In any combination, Doherty topology may include a bias control module.

The present invention provides a laser transmitting circuit, a laser receiving circuit, a distance calculation circuit and devices thereof. The laser transmitting circuit comprises an energy storage capacitor, a laser transmitting tube, an MOS switch circuit and an MOS switch driving circuit. The laser receiving circuit comprises a laser receiving tube, a first low-noise triode, a second low-noise triode and a low-noise wideband amplifier. The distance calculation circuit comprises a singlechip, a programmable logic circuit, a clock source and an echo identification circuit. The present invention further provides a low-voltage power circuit that provides a reverse polarity protection to an external power supply without additional diode connected in reverse polarity. According to the technical solutions provided by the present invention, the measurement range and precision of a semiconductor laser rangefinder can be improved effectively.

The invention relates to the fields of quantum secret communication, weak ultrared detection, and the like, and provides a ultrared single-photon detector. The ultrared single-photon detector comprises a sine-wave gate-control power source, an In-Ga-As-In-P avalanche photodiode circuit, a DC voltage baising circuit, a semiconductor temperature-control circuit, a low-pass filter, a high-speed wideband amplifier, a ultra-high-speed comparator and a counter, wherein sine waves which have the frequency of gigahertz (GHz) and are output by the sine-wave gate-control power source are used as gate control signals of the In-Ga-As-In-P avalanche photodiode circuit, and spike noise caused by junction capacitance differential effect for the low pass filter is used for filtering in a low-pass mode. The gigahertz sine-wave gate-control low-pass filtering ultrared single-photon detector solves the problem of spike noise interference in the prior art, increases the detection sensitivity of avalanchesignals and is used for detecting GHz high-speed ultrared photon.

Current-controlled CMOS (C3MOS) fully differential integrated wideband amplifier / equalizer with adjustable gain and frequency response without additional power or loading. A novel approach is presented by which adjustable amplification and equalizer may be achieved using a C3MOS wideband data stage. This may be referred to as a C3MOS wideband data amplifier / equalizer circuit. This employs a wideband differential transistor pair that is fed using two separate transistor current sources. A switchable RC network is communicatively coupled between the sources of the individual transistors of the wideband differential transistor pair. There are a variety of means by which the switchable RC network may be implemented, including using a plurality of components (e.g., capacitors and resistors connected in parallel). In such an embodiment, each component may have an individual switch to govem its connectivity in the switchable RC network thereby allowing a broad range of amplification and equalization to be performed.

The invention provides an optical detector, a component of the optical detector, and a photoelectric front-end amplifier circuit, belonging to the technical field of four-quadrant photoelectric detection application. The photoelectric front-end amplifier circuit comprises three-stage structures including a low-noise front-end trans-impedance amplifier, an intermediate-stage voltage amplifier and an output buffer amplifier; and the three-stage circuits are coupled through direct current to form a wideband amplifier. The optical detector, the component of optical detector, and the photoelectric front-end amplifier circuit disclosed by the invention have the benefits that: the circuit structure is compatible with the existing detector process; single integration can be carried out; and the four-quadrant photoelectric detector is small in volume, low in power consumption and cost, and high in reliability.

A wideband amplifier having an amplifier input terminal and an amplifier output terminal includes at least one transistor coupled to the amplifier input terminal and an impedance element coupled between the amplifier input terminal and the amplifier output terminal. A feedback signal is transmitted between the amplifier output terminal and the amplifier input terminal by way of the impedance element wherein the feedback signal varies in accordance with changes in an impedance of the impedance element so as to peak a frequency response of the amplifier.

The invention discloses a low-noise amplifier circuit. The low-noise amplifier circuit comprises an input coupling network, a first amplifier element, a first biasing unit, a second amplifier element and a second biasing unit, wherein a front-end circuit and the rear-end first amplifier element are connected by the input coupling network; the first amplifier element is connected with the input coupling network and used for amplifying an input signal; the first biasing unit is connected with the first amplifier element, and used for controlling a quiescent operating point of the first amplifier element in a linear amplifying zone; the second amplifier element is connected with the first amplifier element and used for amplifying an output signal of the first amplifier element; the second biasing unit is connected with the second amplifier element, and used for controlling a quiescent operating point of the second amplifier element in the linear amplifying zone. According to the technical scheme, a high-input impedance wideband and low-noise amplifier is adopted, the wideband amplifier realizes pre-amplifying decoupling through high-input impedance, provides a wider frequency band, provides a low noise coefficient, and supports the application of multi-nuclear magnetic resonance imaging; the design complexity is reduced, the circuit is convenient to debug, and element materials are saved.

The present invention discloses a high-gain broad-band amplifier circuit that has temperature compensation and consists of a traditional Darlington transistor based routine radio frequency broad band amplifier circuit, a diode 13 that is connected with the dividing resistor 21 in the traditional Darlington transistor based routine radio frequency amplifier circuit, the collector of the diode 13 is connected with the base electrode of the transistor 11 in the traditional Darlington transistor based routine radio frequency broad band amplifier circuit, the collector 13 of the diode 13 is connected with the base electrode of itself, the emitter of the diode 13 is connected with the emitter of the transistor 11 through the dividing resistor 24 and the ballasting resistor 23. The present invention has the advantages of reducing the negative feedback of the amplifier circuit, improving the gain of the amplifier circuit, reducing the changes of the base electrode circuit that are caused by voltage drop changes of the transistor 11 and transistor 12 and gaining the function of compensating the temperature of the circuit.

The invention relates to a feedback or feedforward type variable gain wideband amplifier. The variable gain wideband amplifier includes a feedback-type inversion amplifier circuit 310 for amplifying input Vin, a feedback-type non-inversion amplifier circuit 320 for amplifying input Vin, a power source circuit 330 for controlling the gain of the non-inversion amplifier circuit 320 and a load circuit 340 connected between a junction of output terminals of the inversion and non-inversion amplifier circuits 310 and 320 and power voltage potential VDD to control the gain of the amplifier circuits 310 and 320. The variable gain wideband amplifier of the invention is feedforward type, and outputs signals from the inversion and non-inversion amplifier circuits 310 and 320 via a single output terminal in order to attenuate third order intermodulation frequency IM3 generated from the amplifier circuits 310 and 320. Then, predetermined frequencies f1 and f2 included in the input signal are amplified.

A Doherty amplifier is disclosed, being adapted to receive an RF input signal and to output an RF output signal and comprising a main amplifier and a peak amplifier, each comprising: a first amplifier (T1, T1') and a second amplifier (T2, T2'), each amplifier having a respective input terminal and a respective output terminal, the first amplifier and the second amplifier being adapted to amplify a respective input signal derived from the RF input signal and received at the respective input terminal and to deliver a first output signal and a second output signal, respectively; a first phase shifter (14, 14') and a second phase shifter (15, 15') coupled to the output terminal of the first amplifier and to the output terminal of the second amplifier, respectively; a third phase shifter (16, 16'); and a fourth phase shifter (17, 17').

Current-controlled CMOS (C3MOS) fully differential integrated wideband amplifier / equalizer with adjustable gain and frequency response without additional power or loading. A novel approach is presented by which adjustable amplification and equalizer may be achieved using a C3MOS wideband data stage. This may be referred to as a C3MOS wideband data amplifier / equalizer circuit. This employs a wideband differential transistor pair that is fed using two separate transistor current sources. A switchable RC network is communicatively coupled between the sources of the individual transistors of the wideband differential transistor pair. There are a variety of means by which the switchable RC network may be implemented, including using a plurality of components (e.g., capacitors and resistors connected in parallel). In such an embodiment, each component may have an individual switch to govern its connectivity in the switchable RC network thereby allowing a broad range of amplification and equalization to be performed.

A wide band amplifier includes a core amplifier having input terminals and output terminals for, respectively, receiving differential input signals and providing amplified differential output signals. A bandwidth peaking network is coupled to the core amplifier and includes (a) a first coil and a first resistor connected in series and (b) a second coil and a second resistor connected in series. The first coil and resistor and the second coil and resistor, respectively, are coupled to the core amplifier for receiving the amplified differential output signals. The bandwidth peaking network is configured to increase the frequency bandwidth of the amplifier. The bandwidth peaking network includes (a) a first node formed between the first coil and resistor, (b) a second node formed between the second coil and resistor, and (c) a third resistor is connected between the first node and the second node. This resistor is free of current flow at low frequency operation of the amplifier.

Provided is a wideband amplifier which can provide an increased operation bandwidth without being limited by manufacturing process. A source follower circuit having a MOS transistor and constant-current supplies is provided in parallel to a MOS transistor serving as an amplifier of the input stage. Furthermore, the sources of the MOS transistor serving as the output of the source follower circuit are connected to the output nodes of the input stage amplifier via phase compensation capacitors, respectively. This configuration provides an increased phase allowance to the wideband amplifier, thereby providing an improved operation bandwidth without being limited by the manufacturing process employed.

Apparatus and methods for unified high-bandwidth, low-latency data services provided with enhanced user mobility. In one embodiment, a network architecture having service delivery over at least portions of extant infrastructure (e.g., a hybrid fiber coax infrastructure) is disclosed, which includes standards-compliant ultra-low latency and high data rate services (e.g., 5G NR services) via a common service provider. In one variant, an expanded frequency band (e.g., 1.6 GHz in total bandwidth) is used over the coaxial portions of the HFC infrastructure, which is allocated to two or more sub-bands. Wideband amplifier apparatus are used to support delivery of the sub-bands to extant HFC network nodes (e.g., hubs or distribution points) within the network. Premises devices are used to providethe 5G-based services to users at a given premises and thereabouts. In another variant, local area (e.g., "pole mounted") radio devices are used to provide supplemental RF coverage, including during mobility scenarios.

The invention relates to a feedback or feedforward type variable gain wideband amplifier. The variable gain wideband amplifier includes a feedback-type inversion amplifier circuit 310 for amplifying input Vin, a feedback-type non-inversion amplifier circuit 320 for amplifying input Vin, a power source circuit 330 for controlling the gain of the non-inversion amplifier circuit 320 and a load circuit 340 connected between a junction of output terminals of the inversion and non-inversion amplifier circuits 310 and 320 and power voltage potential VDD to control the gain of the amplifier circuits 310 and 320. The variable gain wideband amplifier of the invention is feedforward type, and outputs signals from the inversion and non-inversion amplifier circuits 310 and 320 via a single output terminal in order to attenuate third order intermodulation frequency IM3 generated from the amplifier circuits 310 and 320. Then, predetermined frequencies f1 and f2 included in the input signal are amplified.

The invention belongs to the technical field of electronics, and in particular relates to a 0-10M wideband amplifier, which comprises a first-stage double-ended differential amplifier circuit, a second-stage cobase symmetrical voltage amplifier circuit, a third-stage single-tube driving circuit and a fourth-stage push-pull current amplifier circuit. The amplifier is capable of linearly amplifying a signal with a frequency range of 0-10MHZ and amplitude of 0.25V, the output voltage amplitude can reach 15V, and the load capacity is 50 ohms. According to the amplifier provided by the invention, the full-band amplification can be realized without switching input signals; a common emitter-common base-common emitter circuit is used to improve the high-frequency gain and linearity of full band. The amplifier provided by the invention can be used for amplifying electronics, communications, voice and image signals, and can be used as a signal generator with high load capacity and a power system broadband and high-frequency transient traveling wave signal generator with certain load capacity.

The invention discloses a time of exposure non-intervention measuring device and a method of an X-ray machine. The time of exposure non-intervention measuring device comprises a detecting module and a processing module. The detecting module comprises a flickering body and a light probing device. A probing end of the light probing device is tightly adhered to the flickering body and an output end of the light probing device is connected with the processing module through a bandwidth amplifier. The time of exposure non-intervention measuring device and the method of the X-ray machine have the advantages that the defect of fake 'time of exposure' which might occur in an intervention measuring manner is overcome, a time interval of every two ray impulses is constantly measured by the short fluorescence fall time flickering body, the light probing device, the bandwidth amplifier and the high-speed data real-time processing module, so that the method of measuring density of nuclear incidents is achieved, affection of response time of an electronic circuit on a leading-edge and a lagging-edge of density variation of the nuclear incidents is reduced and an error in working out the time of exposure is narrowed.

The invention discloses a wideband amplifier circuit of a Darlington structure. The wideband amplifier circuit comprises a first-stage amplification circuit, a second-stage amplification circuit and a phase regulating circuit. The first-stage amplification circuit comprises a first triode, and the base of the first triode is the signal input end of the wideband amplifier circuit. The second-stage amplification circuit comprises a second triode and a third triode. The emitter of the second triode is connected with the collector of the third triode, the base of the second triode is connected with direct-current bias voltages, and the emitter of the third triode is grounded. The emitter of the first triode is connected with the base of the third triode, and the collector of the first triode is connected with the collector of the second triode and serves as the signal output end of the wideband amplifier circuit. The phase regulating circuit is used for adjusting the current phase of the collector of the first-stage amplification circuit. One end of the phase regulating circuit is grounded, and the other end of the phase regulating circuit is connected with the connecting end of the emitter of the first triode and the base of the third triode.

Current-controlled CMOS (C3MOS) fully differential integrated wideband amplifier / equalizer with adjustable gain and frequency response without additional power or loading. A novel approach is presented by which adjustable amplification and equalizer may be achieved using a C3MOS wideband data stage. This may be referred to as a C3MOS wideband data amplifier / equalizer circuit. This employs a wideband differential transistor pair that is fed using two separate transistor current sources. A switchable RC network is communicatively coupled between the sources of the individual transistors of the wideband differential transistor pair. There are a variety of means by which the switchable RC network may be implemented, including using a plurality of components (e.g., capacitors and resistors connected in parallel). In such an embodiment, each component may have an individual switch to govem its connectivity in the switchable RC network thereby allowing a broad range of amplification and equalization to be performed.

A wideband amplifier is provided with at least one erbium-doped fiber, for use in a wavelength division multiplexing optical communication system that performs transmission / receipt of wavelength-division-multiplexed optical signals through at least one optical fiber. The wideband amplifier comprises an erbium-doped fiber, pumped by a first pump light that pumps erbium ions and a second pump light that induces a Raman amplification, that amplifies the optical signals, a first pumping light source that outputs a predetermined wavelength of first pump light such that the erbium ions are pumped from the erbium-doped fiber, a first wavelength selective coupler that passes through optical signals amplified at the erbium-doped fiber and that inputs the first pump light into the erbium-doped fiber, a second pumping light source that outputs a predetermined wavelength of the second pump light such that a Raman pumping is performed of the erbium-doped fiber, and a second wavelength selective coupler that passes through optical signals amplified at the erbium-doped fiber and that inputs the second pump light into the erbium-doped fiber.

The present invention provides a laser transmitting circuit, a laser receiving circuit, a distance calculation circuit and devices thereof. The laser transmitting circuit comprises an energy storage capacitor, a laser transmitting tube, an MOS switch circuit and an MOS switch driving circuit. The laser receiving circuit comprises a laser receiving tube, a first low-noise triode, a second low-noise triode and a low-noise wideband amplifier. The distance calculation circuit comprises a singlechip, a programmable logic circuit, a clock source and an echo identification circuit. The present invention further provides a low-voltage power circuit that provides a reverse polarity protection to an external power supply without additional diode connected in reverse polarity. According to the technical solutions provided by the present invention, the measurement range and precision of a semiconductor laser rangefinder can be improved effectively.

A wideband amplifier having an amplifier input terminal and an amplifier output terminal includes at least one transistor coupled to the amplifier input terminal and an impedance element coupled between the amplifier input terminal and the amplifier output terminal. A feedback signal is transmitted between the amplifier output terminal and the amplifier input terminal by way of the impedance element wherein the feedback signal varies in accordance with changes in an impedance of the impedance element so as to peak a frequency response of the amplifier.