47 results about "Millimeter wave amplifiers" patented technology

The invention relates to a serial-parallel connection modulation optical frequency multiplication millimeter-wave RoF (Radio Over Fiber) system and a QPSK (Quadrature Phase Shift Keying)/16QAM (Quadrature Amplitude Modulation) modulation method thereof. The system comprises a central station, a base station and fiber connection thereof, wherein the central station comprises a single longitudinal mode laser, a double-electrode Mach-Zehnder optical modulator, an IQ optical modulator, two microwave signal sources, a pi phase shifter, a pi/2 phase shifter and an erbium doped fiber amplifier; and the base station comprises an optical detector, a front low-noise amplifier, two millimeter-wave bandpass filters, two millimeter-wave amplifiers, a millimeter-wave duplexer and a millimeter-wave antenna. In the method, the cascading of the double-electrode Mach-Zehnder optical modulator and the IQ optical modulator is adopted, and a balanced optical waveguide structure formed by integrating the two optical modulators avoids the influence of optical source phase interference noise caused by support arm optical delay inequality on modulation signals.

The invention relates to a coaxial-ridge waveguide-microstrip conversion structure ultra-broadband multi-channel power splitter. The input coaxial joint and the extended coaxial waveguide adopt a tapered coaxial gradual transition, and the tapered coaxial gradual transition And the ridge waveguide-microstrip conversion structure can realize ultra-wideband impedance matching; N ridge waveguide-microstrip conversion structures are uniformly distributed along the circumference in the extended coaxial waveguide to realize N-way parallel power division, and the entire power division circuit has axisymmetric To ensure that the signal amplitudes and phases of the N-channel power division signals are equal, the N-channel signal power division can be realized in one step, which can minimize the signal transmission loss. The present invention has ultra-wideband, low transmission loss, can realize any multi-channel power division output, each power division output signal has good amplitude and phase consistency, flat group delay characteristics in the band, and is easy to integrate with other peripheral planar circuits, etc. advantage. The invention is mainly used in microwave and millimeter wave power synthesis amplification systems, array antennas, etc., and has broad application prospects in microwave and millimeter wave systems such as communication and radar.

The present invention relates to a system for generating a two-way light phase modulation millimeter wave and providing remote local oscillator in a millimeter wave optical fiber transmission system and a method thereof. The system comprises a center station and a base station. The center station is composed of a laser, two polarization controllers, a double-electrode Mach-Zehnder modulator, a microwave difference power amplifier, a light intensity modulator, an optical fiber amplifier and the like. The base station is composed of a photodetector, a front low-noise amplifier, a power divider,two band-pass filters, two millimeter wave amplifier and a millimeter wave transmitting antennae. In the method, a single mode laser is divided into two routes at the center station. Two opposite-phase 5GHz cosine microwave signals are used for phase modulating with large modulation index to the two routes of optical wave. The two routes of optical waves are overlapped. The phase variation of theoptical wave is switched to a strength variation through a FM-IM effect. The strength variation comprises a microwave signal and a high order component thereof. The millimeter wave signal is obtainedby extracting the high order harmonic. Then the optical fiber is executed with a strength modulation with a 2GHz BPSK signal and a mode of regulated subcarrier through a light intensity modulator. A 40GHz millimeter wave remote reference local oscillator and a 38GHz BPSK signal are obtained at the base station. The number of optical frequency doubling gets to 8, and the speed of baseband data transmission gets to 200Mbps.

A device used for generating QPSK millimeter wave of radio frequency optical fiber transmission system consists of semiconductor laser of central station, polarization controller, optical phase modulator, optical comb fiber, optical QPSK modulator, optical branching unit/combining unit, optical detector of base station, narrow band band-pass filter, millimeter wave amplifier and millimeter wave antenna. Its optical modulating method for obtaining QPSK modulated millimeter wave signal is also disclosed.

The invention discloses a millimeter-wave ultra-wideband high-gain low-power-consumption low-noise amplifier chip circuit. A mode of combining a cascode structure and a current multiplexing structureis adopted; the two structures are connected through a matching network; according to the millimeter wave amplifier, the working bandwidth of the millimeter wave amplifier is effectively improved, signals can be amplified for multiple times, the gain is improved. Meanwhile, low power consumption is achieved, especially in the millimeter wave frequency band, the problems of gain abrupt drop and noise deterioration are effectively solved, power output in the amplifier can be achieved, and meanwhile low power consumption is achieved. According to the invention, the amplifier can integrate variousexcellent performances such as high gain, low noise, medium power output, low power consumption, good standing wave and the like in an ultra-wideband millimeter wave frequency band, so that the performance of application fields such as electronic countermeasure equipment, a wideband high-speed communication system, a millimeter wave high-end measuring instrument and the like is expected to be improved.

A novel and useful fully integrated switched-mode wideband 60 GHz power amplifier architecture. Using an appropriate second-harmonic termination of its output matching network, the required systematic peak current of the final stage is reduced such that the PA functions as a class-E/F₂ switched-mode PA at saturation. In addition, low/moderate magnetic coupling factor transformers in the intermediate stages enable the PA to reach a high power added efficiency (PAE) and bandwidth product. Transformers of low/moderate coupling are also utilized in the preliminary stages of the PA to improve the overall bandwidth. In addition, the PA exploits the different behavior of the output impedance matching network for differential mode (DM) and common mode (CM) excitations. The PA is also stabilized against the combination of DM and CM oscillation modes. The PA also provides a technique to stabilize transformer-based mm-wave amplifiers against various modes of undesired oscillations.

The invention is applicable to the technical field of amplifiers and provides a dielectric-free high-frequency extensible-broadband high-performance waveguide amplifier. The waveguide amplifier comprises an upper cavity, sheets and a lower cavity which are integrated, wherein the sheets are positioned between the upper cavity and the lower cavity. A metal ridge is formed on wide sides of the lower cavity, and the metal ridge and the sheets form an imbalance-to-balance conversion structure, so that conversion from a waveguide field mode to a coplanar waveguide field mode is achieved. The waveguide amplifier has the advantages that bad influences such as dielectric loss, resonance and the like caused by dielectric substrates can be eliminated completely, performances of the millimeter wave amplifier designed based on a circuit are improved greatly, and particularly, the higher the frequency is, the more obvious the advantages displayed by the amplification circuit are.

The invention discloses a down-conversion method of an ultra-low additional phase noise millimeter wave signal source. The utility model aims to provide the millimeter wave signal down-conversion method with low additional phase noise and high phase noise measurement accuracy. According to the technical scheme, a broadband intensity modulator is used for modulating a DBF light source, the DBF light source is divided into two optical signals after being amplified by an optical amplifier and filtered by an optical filter, and one optical signal is sent to a first photoelectric detector through ashort optical fiber to be converted into an electric signal; the other path is sent to a second photoelectric detector through a long optical fiber, an optical amplifier, an optical filter and an optical attenuator and is converted into an electric signal; wherein the two paths of electric signals are combined into one path through the millimeter wave combiner, then the electric signals are divided into two paths of millimeter wave signals through the millimeter wave power divider after passing through the millimeter wave amplifier and the filter, and one path of electric signals is input into an electric input interface of the broadband photoelectric modulator to form a photoelectric loop; and the other path of signal is input to a local oscillator input port of the millimeter wave mixerand is mixed with a millimeter wave signal needing to be down-converted to obtain an intermediate frequency signal.

The invention discloses a millimeter wave amplifier unilateralization network using an on-chip transformer with a random coupling coefficient. The network comprises a common source structure amplifier (1) and the on-chip spiral transformer (2). A primary coil (21) and a secondary coil (22) of the transformer (2) are respectively connected to a grid electrode and a drain electrode of the common source structure amplifier (1), voltage-current feedback is introduced, specific unilateralization conditions are met by regulating a self-inductance value of the secondary coil and a grid-drain stray capacitance of a transistor is offset by resonance, so that reverse isolation of the common source amplifier is greatly improved and the defects of high requirement on the coupling coefficient of the transformer and poor reverse isolation of a conventional millimeter wave common source amplifier are overcome.

The invention is an improvement in microwave and millimeter wave amplifiers. Capacitors are connected in parallel with the source and drain terminals of all of the amplifying elements in a series of such elements except the first, compensating for current leakage due to gate capacitance. This results in improved synchronism of the amplifying elements, and improved overall efficiency and circuit performance.

The invention discloses a millimeter wave amplifier matching circuit based on a difference coupling line and belongs to the fields of radio frequency and millimeter wave terahertz integrated circuit design. The circuit is composed of two stages of amplifying circuits and a matching network connected between the two stages of amplifying circuits; each amplifying circuit respectively comprises one NMOS transistor, one feedback capacitor and one group of difference coupling lines; the matching network is divided into an input matching network, an inter-stage matching network and an output matching network; the input matching network adopts a third difference coupling line, the inter-stage matching network comprises a fourth difference coupling line and a first blocking capacitor, and the output matching network comprises a fifth difference coupling line and a second blocking capacitor; and each group of difference coupling line is composed of two transmission lines which are placed in parallel and mutually coupled. The millimeter wave amplifier matching circuit can greatly increase gain while guaranteeing constant power consumption, stability is enhanced under the same conditions, andlayout area is reduced, so that performance of an amplifier is improved.

The invention belongs to the technical field of millimeter wave communication, and particularly provides a V-band CMOS power amplifier which is used for solving the problems that in the prior art, thecircuit structure is complex, the chip area is large, and the design difficulty of an amplifier matching circuit is large. The amplifier comprises an input matching circuit, a first-stage amplification circuit, an inter-stage matching circuit, a second-stage amplification circuit and an output matching circuit which are connected in sequence, wherein the two stages of amplification circuits are formed by stacking transistors M1 (or M3) and M2 (or M4) respectively; the transistor stacking mode is simple in structure, the breakdown risk of the transistors can be effectively reduced, and the optimal power amplifier saturation output power is obtained; meanwhile, the transistor stacking structure can greatly improve the stability of the millimeter wave power amplification circuit; in addition, the input and output matching circuits in a grounding coplanar waveguide form can further improve the gain and the output power of the millimeter wave amplifier while realizing good input and outputmatching of the stacked transistors in a millimeter wave frequency band.

The invention discloses a millimeter wave amplifier convenient to connect a power tube and a using method thereof. The millimeter wave amplifier convenient comprises an amplifier shell and a box cover, and connecting blocks are fixedly connected to the four corners of the top of the outer side of the amplifier shell and the four corners of the bottom of the outer side of the box cover; and a threaded hole is formed in the middle of each connecting block. The invention has the beneficial effects that through cooperation of the air blowing mechanism and the cooling mechanism, cooling of the millimeter wave amplifier can be better accelerated, the cooling efficiency in the equipment is improved, and it is guaranteed that the equipment can be normally and safely used; the internal components of the equipment are prevented from being damaged due to long-time operation in a high-temperature state, and the power tube can be better positioned in an auxiliary manner through the positioning assembly, so that a worker can perform other operations with hands when mounting the power tube, the accuracy of the mounting position of the power tube is improved, and more labor-saving installation and welding can be carried out on the support.

The invention discloses a timing sequence DC electrical source for a millimeter wave amplifier, and relates to DC electrical sources. The timing sequence DC electrical source for the millimeter wave amplifier comprises an adjustable three-terminal voltage stabilizer, a first low dropout voltage stabilizer, a second low dropout voltage stabilizer, a voltage regulator circuit and a voltage converter. The voltage output end of the adjustable three-terminal voltage stabilizer is connected with the voltage input end of the first low dropout voltage stabilizer, and the voltage output end of the first low dropout voltage stabilizer is connected with the positive electrode of a load. The voltage output end of the second low dropout voltage stabilizer is connected with the voltage input end of the voltage converter, the voltage output end of the voltage converter is connected with the voltage input end of the voltage regulator circuit, and the signal output end of the voltage regulator circuit is connected with the signal input end of the adjustable three-terminal voltage stabilizer. The voltage output end of the voltage converter is further connected with the negative electrode of the load. The timing sequence DC electrical source which is manufactured through the switching characteristic of an audion can well prevent surge voltages from damaging a chip at the moment of startup and shutdown, the manufacturing cost is low, and performance is stable.

The invention discloses a global bias scheme suitable for a multi-channel phased array and an embedded current mirror amplification circuit technology. The embedded current mirror amplification circuit is structurally characterized in that a capacitor-neutralized common-source differential amplifier structure is adopted, and transistor parts (218 and 220) are composed of first amplification tubes(202), second amplification tubes (204), first mirror tubes (206) and second mirror tubes (208). The transistor parts (218, 220) in the structural characteristics of the embedded current mirror amplifying circuit embed a mirror image tube area (304) into an amplifying tube area (302) in the process characteristics, so that the randomness of process size errors is reduced, and high-precision matching of the transistor and the mirror image tube size is realized. On the basis of the technology, a global bias scheme suitable for a phased array system is provided, and the consistency of all channels of the phased array is effectively improved. The technology is suitable for the design of the high-gain millimeter wave amplifier in the multi-channel millimeter wave phased array application.

The invention discloses a millimeter wave broadband gain self-balancing low-power amplifier capable of switching power supply up and down. A parallel negative feedback structure is combined with a current multiplexing structure, so that the bandwidth is broadened, gain self-balancing is realized in an ultra-wideband range, the balancing amount can reach 2-3dB, and meanwhile, low power consumptionis realized. Meanwhile, the two power supply feed ends of an output matching network are each provided with a power supply filtering structure, when one end is fed, the other end is kept suspended, and up-down switchable power supply can be realized. The amplifier is convenient to use, and the layout of a microwave assembly where an ultra-wideband millimeter wave amplifier chip is located is facilitated.

The invention discloses a hybrid link architecture method based on millimeter wave communication and free light communication. In the downlink direction of the photon-assisted millimeter wave link, the optical carrier provided by one single-mode laser I is modulated by downlink data through one optical modulator I and then coupled with the optical carrier provided by the other single-mode laser IIthrough one optical coupler I, the modulated optical carrier and the unmodulated optical carrier which are coupled together are subjected to heterodyne beat frequency by a single-ended photodiode togenerate a wireless millimeter wave signal carrying downlink data; and the generated wireless millimeter wave signal carrying the downlink data is amplified by a millimeter wave amplifier I and then sent to a free space through a sending end antenna I for transmission. Compared with the prior art, the method has the advantages that the links are freely switched, wireless millimeter wave communication and free space coherent light laser communication are compatible, and all-weather communication is achieved.

The invention discloses a millimeter wave amplifier chip testing cavity and method. Existing coaxial-interface-based millimeter wave amplifier chip testing devices only reaches a maximum working frequency of 145 GHz and fails to meet the testing and modularizing demands of high-frequency millimeter wave amplifier chips and to be applied to a millimeter wave front-end system. The millimeter wave amplifier chip testing cavity comprises an input interface cavity, an input end microstrip probe matching structure loading cavity, a millimeter wave amplifier chip loading cavity, an output end microstrip probe matching structure loading cavity, an output interface cavity, a first capacitor combination cavity and a second capacitor combination cavity, wherein the first capacitor combination cavityand the second capacitor combination cavity are arranged o both sides of the millimeter wave amplifier chip testing cavity. According to the millimeter wave amplifier chip testing cavity, the bias voltage of a millimeter frequency amplifier chip can be applied to independent power supply or by-pass capacitor filtering, thereby simplifying the structure and improving the circuit stability.