58results about How to "Increased Gain Bandwidth" patented technology

There is described a device for converting an input signal having a given input voltage (Vbat) value (Vbat) into an output signal having an output voltage (Vout) (Vout) different from the input voltage (Vbat). The device comprises a main module (56), arranged between an input terminal (54) and a first circuit node (N1), The device is adapted to output at the first circuit node (N1) a pulse-width-modulated (PWM) signal switching between a first voltage value and a second voltage value, defining a switching range (SR(i)), by switching successively between a first mode of operation and a second mode of operation. The switching range (SR(i)) of the pulse width modulation (PWM) has an amplitude, calculated as the absolute difference between the first and the second voltage value, inferior or equal to Vout half the input voltage (Vbat).

The invention relates to a multi-fiber core single-mode optical fiber and a manufacturing method thereof. The multi-fiber core single-mode optical fiber comprises claddings and a plurality of fiber cores. The multi-fiber core single-mode optical fiber is characterized in that the fiber cores include a pumping fiber core and a plurality of signal fiber cores, wherein the pumping fiber core is arranged in the center of the optical fiber, the signal fiber cores are distributed on one to three circumferences around the center at equal intervals, so as to form one to three layers of signal fiber cores, sunken claddings tightly cover each signal fiber core, and common claddings are arranged outside the sunken claddings. The multi-fiber core single-mode optical fiber has the characteristics of low signal crosstalk among all of the signal fiber cores, easiness in online light amplification, simplicity and convenience in manufacturing and low manufacturing cost and is suitable for large-scale production. A distributed Raman amplification technique of the multi-fiber core single-mode optical fiber is used in an ultrahigh-speed communication system, so that effective light amplification can be realized, and the harm of a non-linear effect to the performance of a high-speed optical transmission system is further reduced.

A lookahead pipelined ADC architecture uses open-loop residue amplifiers with calibration. This approach is able to achieve a high-speed, high-accuracy ADC with reduced power consumption. In one aspect, an ADC pipeline unit includes a plurality of lookahead pipeline stages (i.e., an ADC lookahead pipeline) coupled to a calibration unit. The ADC lookahead pipeline uses open-loop residue amplifiers. The calibration unit compensates for non-linearity in the open-loop amplifiers.

The present invention discloses a hybrid optical amplifier coupling a Raman fiber amplifier and a semiconductor optical amplifier, comprising: a laser diode generating and irradiating a laser light for a Raman optical amplification; a wavelength division multiplexer passing an incident signal light and irradiating a laser light irradiated from the laser diode in a reverse direction of the incident signal light; and a gain clamped semiconductor optical amplifier amplifying an optical signal irradiated from the wavelength division multiplexer.

The invention discloses a novel broadband low-profile dielectric lens antenna, and belongs to the technical field of microwave. The antenna feed source part of the lens antenna comprises two layers of dielectric plates; rectangular gaps in the metal grounding surface of the bottom layer dielectric plate of the feed source are coupled with square patches on the upper layer dialectic plate through an air layer to generate polarized wave; a novel cavity-free part reflective surface consists of two layers of frequency selection surfaces with dielectrics, and the reflective phases are changed along with frequencies in a positive slope manner and are matched with the feed source antenna so as to greatly improve the 3dB gain bandwidth of the antenna finally; by virtue of the cavity-free part reflective surface, the profile height of the resonant cavity antenna is lowered, so that the low profile characteristic of the antenna is realized; in addition, the reflective coefficient of the novel part reflective surface is higher than that of the similar type surface, so that the working frequency band gain of the antenna is improved stably; and in general, the design has certain application prospect.

A lookahead pipelined ADC architecture uses open-loop residue amplifiers with calibration. This approach is able to achieve a high-speed, high-accuracy ADC with reduced power consumption. In one aspect, an ADC pipeline unit includes a plurality of lookahead pipeline stages (i.e., an ADC lookahead pipeline) coupled to a calibration unit. The ADC lookahead pipeline uses open-loop residue amplifiers. The calibration unit compensates for non-linearity in the open-loop amplifiers.

The invention relates to an improved Fabry-Perot resonant cavity antenna, belongs to the technical field of resonant cavity antennas, and aims at solving the problem that the present abry-Perot resonant cavity antenna is low in gain bandwidth. The antenna comprises a feed source and a portion reflecting plate, the feed source includes a rectangular patch antenna, the portion reflecting plate is arranged over the feed source in parallel, and the height of a resonant cavity body formed between the feed source and the portion reflecting plate is h; and the portion reflecting plate is of a double-layer coating structure, the upper surface of the portion reflecting plate includes a copper clad array of periodical arrangement, and the lower surface includes a hollow cross-shaped copper clad square array of periodical arrangement. A PRS structure of the portion reflecting plate enables a reflection value module value of the reflecting plate to be higher, the gain of the feed source antenna is thus improved, the phase and frequency of the reflection coefficient is positively correlated, and thus, the impedance bandwidth and the gain bandwidth are both improved.

The present invention discloses a hybrid optical amplifier coupling a Raman fiber amplifier and a semiconductor optical amplifier, comprising: a laser diode generating and radiating a laser light for a Raman optical amplification; a wavelength division multiplexer passing an incident signal light and radiating a laser light radiated from the laser diode in a reverse direction of the incident signal light; and a gain clamped semiconductor optical amplifier amplifying an optical signal light radiated from the wavelength division multiplexer.

An electronic amplifier circuit comprising an operational amplifier circuit, such as a two-stage operational amplifier circuit, in tandem with a operational transconductance amplifier. The electronic amplifier circuit has high open-loop gain and high gain-bandwidth while maintaining stability over a wide range of operating parameters.

A super Gaussian pulse generation method on the basis of gain reshaping includes the following steps: firstly, a wideband linear chirp laser pulse is generated, and the central wavelength of the wideband linear chirp laser pulse is adjusted to be longer than the intrinsic emission line peak wavelength of the doped gain ion of an optical fiber amplifier; secondly, the gain-narrowed lower triangular chirp laser pulse is obtained after the linear chirp laser pulse is gain amplified by a pre-amplifier selected with the gain coefficient spectral lines all presenting triangular shapes; finally, the super Gaussian pulse is formed by injecting the lower triangular chirp pulse into a main amplifier selected with the gain optical fiber length being 1 to 3 times of that of the pre-amplifier and the central wavelength of the gain spectrum lines being longer than the pre-amplifier. The device capable of realizing the method comprises an optical fiber femtosecond laser oscillator (9-1), a dispersion compensator (9-2), an optical fiber self-similarity pulse amplifier (9-3), a positive dispersion optical fiber pulse stretcher (9-4), a frequency spectrum filter (10), and a front optical fiber amplifier (11) with at least one stage and a main optical fiber amplifier (12).

A lookahead pipelined ADC architecture uses open-loop residue amplifiers with calibration. This approach is able to achieve a high-speed, high-accuracy ADC with reduced power consumption. In one aspect, an ADC pipeline unit includes a plurality of lookahead pipeline stages (i.e., an ADC lookahead pipeline) coupled to a calibration unit. The ADC lookahead pipeline uses open-loop residue amplifiers. The calibration unit compensates for non-linearity in the open-loop amplifiers.

The invention discloses a low-power-consumption wide-range operational transconductance amplifier which comprises a first stage of differential input stage, a second stage of differential input stage, a gain stage, an output stage and a self-biased circuit. An input signal is input into an input end of the first stage of differential input stage; a bias voltage vb3 loaded to the first stage of differential input stage is generated by the self-biased circuit; an output end of the first stage of differential input stage is connected to an input end of the second stage of differential input stage; bias voltages vb1 and vb2 required by the second stage of differential input stage are generated by the self-biased circuit; an output end of the second stage of differential input stage is connected to an input end of the gain stage; and an output end of the gain stage is connected to an output amplifier in the output stage and a compensation and overcurrent protection circuit. The low-power-consumption wide-range operational transconductance amplifier has the beneficial effects that 1, the low-power-consumption wide-range operational transconductance amplifier has lower power consumption; 2, the low-power-consumption wide-range operational transconductance amplifier has a wider input and output range; and 3, the low-power-consumption wide-range operational transconductance amplifier has a higher gain bandwidth.

Dual amplifying circuits having a magnetic tunnel junction device and a field effect transistor configured in a complementing set are disclosed herein. In one embodiment, the field effect transistor is operable to control a current level of a current operating signal flowing through the magnetic tunnel junction device. In another embodiment, the magnetic tunnel junction device is operable to control a voltage level of a voltage signal being applied to a gate terminal of the field effect transistor. The gain-bandwidth product of both embodiments is greater than the individual gain-bandwidth products of the individual devices through the elimination of noise contributing resistive type circuit elements.

The invention is a novel solution to circumvent the fundamental gain bandwidth limitations of an antenna of a given size by using a traveling-wave (TW) antenna and strongly coupling it with the mounting platform to enlarge the effective size of the antenna. A preferred form of this invention comprises a conducting ground surface generally curvilinear and conformal to said platform, a broadband TW surface radiator positioned above and spaced apart from said ground surface, an impedance matching structure between the surface radiator and the conducting ground surface, and a reactive impedance matching network positioned on the periphery of said surface radiator.

An inductance-free broadband low-noise amplifier with low power consumption, a high gain and high linearity is equipped with an amplification unit, a multiplexing unit, a cascading unit, a load unit, an input matching feedback unit, a current mirror unit and an inverted isolation output matching unit, wherein a radio frequency input signal is connected to the amplification unit; output of the amplification unit is connected to the multiplexing unit and the cascading unit; output of the cascading unit is connected to the load unit, the input matching feedback unit and the inverted isolation output matching unit; output of the input matching feedback unit is connected to the current mirror unit and is also in feedback connection to the amplification unit; and the inverted isolation output matching unit outputs radio frequency output signals.

The invention discloses a broadband pump chirp compensation optical parametric amplification method and device. The titanium sapphire laser source produces an initial femtosecond laser that is split into two beams: a stronger beam is used as pump light, a broadband chirp pump light is obtained after the stronger beam passes through a pump light spectrum stretcher and then enters a nonlinear crystal through a delay line and a dichroic mirror; a weaker beam enters a supercontinuum white light generator as a seed light, resulting in broadband chirp seed light and then enters in the nonlinear crystal through the dichroic mirror and then is coupled with the broadband chirp pump light to perform optical parametric amplification. The invention uses broadband chirp pump light with broadened spectrum and comprises more frequency components; the instantaneous frequency correspondence relationship between the broadband chirp pump light and the broadband chirp seed light is precisely regulated sothat the frequency component of the seed light achieves phase matching over a large range, thereby increasing the gain bandwidth of the signal light and realizing the ultra-wideband signal light spectrum output.

A voltage converter device converts an input signal having a given input voltage value into an output signal having an output voltage different from the input voltage. The device comprises a main module, arranged between an input terminal and a first circuit node, The device is adapted to output at the first circuit node a pulse-width-modulated signal switching between a first voltage value and a second voltage value, defining a switching range, by switching successively between a first mode of operation and a second mode of operation. The switching range of the pulse width modulation has an amplitude, calculated as the absolute difference between the first and the second voltage value, inferior or equal to half the input voltage.

An active filter device and a circuit arrangement comprising an active filter device are disclosed. In an embodiment the active filter device includes sensor terminals for applying a sensor signal depending on a sensed noise signal, an output terminal for providing a correction signal that is suitable for reducing the noise signal, a signal source adapted for generating a correction signal and a high-pass filter coupled between the sensor terminals and the signal source, wherein the correction signal is generated with a dependence on a high-pass filtered sensor signal.

The invention discloses a high-gain tapered slot antenna loaded with a metal cylindrical lens. The high-gain tapered slot antenna comprises a dielectric substrate. The front surface of the dielectricsubstrate is provided with two metal patches. A horn-shaped opening is formed between the two metal patches. The two ends of the horn-shaped opening are located on a pair of opposite side edges of thedielectric substrate respectively. The smallest end of the horn-shaped opening is a slot line end. The largest end of the horn-shaped opening is a radiation tail end. An intermediate slit width change region formed between the slot line end and the radiation tail end is a radiation section. The slot line end is provided with a microstrip feed structure. The radiation section is provided with a metal cylindrical lens structure composed of a plurality of metal cylinder units at a position close to the radiation tail end. The metal cylindrical lens structure of the antenna can improve the phasedistribution at the radiation tail end of the antenna, thereby suppressing the main lobe splitting of the tapered slot antenna in a high-frequency band, and improving the gain and overall radiation performance of the antenna.

The invention discloses a band gap reference voltage source and electronic equipment. The band gap reference voltage source consists of a starting module and a band gap core module; when the band gapreference voltage source compensates for a loop, if a secondary pole of the band gap reference voltage source is equal to a zero point, the second capacitance value required for achieving a stable condition is far smaller than compensation capacitance required by a band gap reference voltage source in the prior art, and obviously, a main pole of the provided band gap reference voltage source is far greater than that of the band gap reference voltage source in the prior art. Therefore, the provided band gap reference voltage source can effectively increase loop bandwidth and achieve the purposes of reducing the loop compensation difficulty of the band gap reference voltage source, increasing unit gain bandwidth and reducing the required compensation capacitance.

The invention provides a helical antenna for an unmanned aerial vehicle. The helical antenna for the unmanned aerial vehicle comprises a carrier and at least four radiation arm groups, wherein each radiation arm group comprises a long arm radiation arm, a short arm radiation arm, a small short arm, a coupling arm and a feed point; every two long arm radiation arms are connected through one coupling arm; each short arm radiation arm is coupled by loading one small short arm; the radiation arm groups are printed on a flexible PCB; and the flexible PCB winds the carrier, and is fixed on the carrier through a reserved capacitor bonding pad. The helical antenna for the unmanned aerial vehicle provided by the embodiment is simple to assemble, easy to mount on the unmanned aerial vehicle, and capable of improving antenna receiving frequency bandwidth and gain bandwidth.

The invention discloses a multistage amplifier which comprises a differential input stage, at least one intermediate amplification stage and an output stage. The differential input stage, the intermediate amplification stages and the output stage are sequentially in cascade connection with one another; the differential input stage comprises a first MOS (metal oxide semiconductor) transistor, a second MOS transistors, a third MOS transistor, a fourth MOS transistor, a first current mirror circuit, a second current mirror circuit, a first bias circuit and a first load circuit, source electrodes and grid electrodes of the first MOS transistor and the second MOS transistor are coupled with one another, and first voltages can be received by the grid electrodes of the first MOS transistor and the second MOS transistor; source electrodes and grid electrodes of the third MOS transistor and the fourth MOS transistor are coupled with one another, second voltages can be received by the grid electrodes of the third MOS transistor and the fourth MOS transistor, the source electrodes of the third MOS transistor and the second MOS transistor are coupled with each other, and first bias currents can be received by the source electrodes of the third MOS transistor and the second MOS transistor; a common grid electrode of the first current mirror circuit is coupled with a drain electrode of the third MOS transistor, and a first drain electrode of the first current mirror circuit is coupled with a drain electrode of the first MOS transistor; a common grid electrode of the second current mirror circuit is coupled with a drain electrode of the second MOS transistor, and a first drain electrode of the second current mirror circuit is coupled with a drain electrode of the fourth MOS transistor; the first bias circuit is suitable for providing bias circuits for the first current mirror circuit and the second current mirror circuit; the first load circuit is suitable for providing load for the differential input stage. According to the scheme, the multistage amplifier has the advantages of high gain and wide unity gain bandwidth.

The invention discloses a low-power consumption programmable gain amplifier. The low-power consumption programmable gain amplifier comprises a first adder subtracter and a second adder subtracter, wherein the first adder subtracter and the second adder subtracter are used for performing addition and subtraction operations on an input signal and a feedback signal; a direct-current component and a direct-current misalignment voltage can be eliminated after adding and subtracting; the two input ends of a variable gain amplifier are respectively connected with the output ends of the first adder subtracter and the second adder subtracter; the input end of a high-pass filter is connected with the output end of the variable gain amplifier; the two output ends of low-pass filter are respectively connected with the input ends of the first adder subtracter and the second adder subtracter; the input end of the low-pass filter is connected with the output end of the variable gain amplifier; the low-pass filter is used for generating a low-pass off frequency to form a high-pass characteristic in a feedback circuit, so that the direct-current misalignment voltage can be eliminated; and the output end of a digital controller is respectively connected with the input ends of the variable gain amplifier, the high-pass filter and the low-pass filter, and is used for providing digital control signals for the variable gain amplifier, the high-pass filter and the low-pass filter.

The invention discloses a high-gain broadband directional element antenna with a cavity reflector. The high-gain broadband directional element antenna comprises an omni-directional element antenna anda cavity reflector, wherein the omni-directional element antenna is an omni-directional broadband element antenna or an omni-directional ultra-wideband element antenna; and the cavity reflector is located below the omni-directional element antenna, and the cavity reflector is an upper opening container made of a conductor. According to the scheme, a reflecting object is replaced from a flat plateinto a cavity structure, the electromagnetic energy radiated by the omni-directional antenna to the lower part of the antenna is reflected back by the cavity structure to always generate the same-phase superposition effect in a certain frequency band with the electromagnetic energy radiated to the upper part of the antenna, so that the gain bandwidth of the antenna is increased, and very high gain flatness in a relatively large bandwidth can be achieved.

The invention discloses a broadband double-oscillation parametric oscillator for reflecting injected pump light, which belongs to the field of optical parametric oscillators and comprises a resonant cavity, a nonlinear crystal and a dielectric mirror. A first plane of the dielectric mirror is used for increasing reflection of the pump light and increasing transmission of the signal light, and a second plane is used for increasing transmission of the signal light; in a working state, the dielectric mirror is located at any position of the signal light in the propagation direction, except the focusing cavity, of the resonant cavity; the incident direction of the pump light is located on the first plane side of the dielectric mirror; the incident direction of the signal light is located on the second plane side of the dielectric mirror; the pump light coincides with the emergent direction of the signal light; the nonlinear crystal is positioned in the focusing cavity of the resonant cavity; the nonlinear crystal is used for amplifying signal optical parameters; and the dielectric mirror is used for reflecting the pump light, so that the emergent directions of the pump light and the signal light coincide. Dispersion introduced by a broadband high-reflection film does not exist in the cavity of the double-oscillation optical parametric oscillator, and therefore the problem that thesignal light broadband is limited due to dispersion of the high-reflection film is solved.

The invention discloses a broadband high-gain metal lens antenna based on four-ridge waveguide. The antenna comprises a lens formed by a plurality of lens units and a feed source horn positioned on a focal plane of the lens, and each lens unit consists of a square waveguide and four ridges positioned in the centers of four walls of the square waveguide. The problem that a traditional lens antenna is difficult to realize wide gain bandwidth and high aperture efficiency at the same time is solved; the antenna disclosed by the invention is high in gain and wide in working gain bandwidth, and can meet the requirement of millimeter wave long-distance communication; and according to the antenna, far-field high-gain radiation is achieved, meanwhile, dual-polarization scanning is achieved in two dimensions, and the antenna is suitable for the application scene of millimeter wave multi-beam scanning.

The invention discloses a broadband optical parametric amplification device based on a double nonlinear optical process. The broadband optical parametric amplification device mainly comprises fundamental frequency light, signal light, a beam splitter, a beam combiner, a frequency doubling crystal, an optical parametric amplification crystal and the like. Fundamental frequency light generates pump light through the frequency doubling crystal, then parametric amplification is carried out on signal light by utilizing the pump light in the optical parametric amplification crystal, meanwhile, a beam of fundamental frequency light is incident, frequency sum is carried out on the fundamental frequency light and idle light generated in the parametric amplification process, and the idle light is consumed, so that the inverse conversion process of optical parametric amplification is inhibited; and optical parametric amplification with higher efficiency and larger bandwidth is realized. The two nonlinear optical processes of optical parametric amplification and sum frequency belong to parametric processes, the heat accumulation effect is extremely low, and the two nonlinear optical processes can be simultaneously realized in many crystal materials and in a very wide wavelength range, so that the method can be suitable for the conditions of high peak power, high average power and the like; and the method can also be applied to optical parametric amplification of different crystals and different wavebands.

The invention discloses a medium air hole loaded high-gain gradually changed slot line antenna. The antenna comprises a dielectric substrate. Two metal patches are arranged on the front surface of the dielectric substrate. A gradually changed slot line with a horn-shaped opening is formed between the two metal patches. Two ends of the horn-shaped opening are respectively positioned on a group of opposite side edges of the dielectric substrate. The minimum end of the horn-shaped opening is a slot line end and the maximum end of the horn-shaped opening is a radiation tail end. A middle slot width change area formed between the slot line end and the radiation tail end is a radiation section. The slot line end is provided with a microstrip feed structure. The middle section of the radiation section extends to the radiation tail end. A dielectric air hole structure composed of a plurality of air hole units is arranged along the edges of the metal patches. According to the invention, through the dielectric air hole structure, the phase distribution at the radiation tail end of the antenna can be improved; the main lobe splitting phenomenon of the gradually changed slot line antenna in a high frequency band is inhibited, and the antenna gain and the overall radiation performance are improved.