118 results about "Solid state power amplifier" patented technology

Radio frequency (RF) power amplifiers are provided which may include high power, wideband, microwave or millimeter-wave solid state power amplifiers based on waveguide power combiner / dividers.

A protection method may prevent a load-mismatch-induced failure in solid-state power amplifiers. In an RF power amplifier, the load voltage standing-wave ratio results in very high voltage peaks at the collector of the final stage and may eventually lead to permanent failure of the power transistor due to avalanche breakdown. The method avoids breakdown by attenuating the input power to the final stage during overvoltage conditions, thus limiting the output collector swing. This is accomplished by a feedback control system, which detects the peak voltage at the output collector node and clamps its value to a given threshold by varying the circuit gain. Indeed, the control loop is unlocked in the nominal condition and it acts when an output mismatching condition is detected. A control circuit also allows a supply-independent collector-clamping threshold to be accurately set.

A Solid State Power Amplifier (SSPA) for powering a single element of a multi-element antenna, the SSPA comprising:an RF amplifier, having a signal amplifying path that includes preamplifier, driver amplifier and a power output stage;an Electronic Power Conditioner (EPC) for providing a variable value of DC voltage for powering the power output stage of the RF amplifier;a control ASIC for receiving an input power signal of the RF amplifier for providing a voltage control signal to the EPC to determine the value of the DC voltage, the control ASIC addressing an EEPROM holding a collection of control words that define output values of a control output signal for varying values of said input power, such that the value of the DC voltage to the power output stage is varied so as to control the gain compression of the RF amplifier for varying values of input power in order to maintain constant amplifier linearity.

The invention provides a radio frequency unfreezing system. The radio frequency unfreezing system at least comprises: a signal source, a solid-state power amplifier, a measuring unit and a demultiplexer, wherein the solid-state power amplifier is a power amplifier using a semiconductor power device; the signal source, and the solid-state power amplifier, the measuring unit and the demultiplexer are connected in sequence; a radiation device, which is connected with the demultiplexer; a control unit, which is separately connected with the signal source, the solid-state power amplifier, the measuring unit and the radiation device; and an unfreezing cavity, which is connected with the radiation device. Compared with the prior art, the radio frequency unfreezing system of the invention has thefollowing advantages: food unfreezing is uniform and fast; and the system is simple, easy to realize and the like.

The invention belongs to the technical field of microwave linearization, and particularly relates to an amplitude and phase tunable type pre-distortion linearizer. According to the pre-distortion linearizer, based on the diode pre-distortion linearization working mechanism, by means of the vector superposition principle, pre-distortion nonlinear compensation with different amplitude and phase requirements is obtained through phase change, and the defect of traditional series-connection and parallel-connection transmission type simulation pre-distortion circuits that only pre-distortion signals suitable for solid-state power amplifiers can be generated and the defect of reflection type pre-distortion circuits that only pre-distortion signals suitable for microwave traveling-wave tube power amplifiers can be generated mostly are overcome; meanwhile, the capacity of control, over the amplitude expansion and phase expansion degrees of generated non-linear signals, of a microwave pre-distortion circuit is improved, and accurate strong-nonlinearity amplitude and phase compensation can be achieved.

A protection method may prevent a load-mismatch-induced failure in solid-state power amplifiers. In an RF power amplifier, the load voltage standing-wave ratio results in very high voltage peaks at the collector of the final stage and may eventually lead to permanent failure of the power transistor due to avalanche breakdown. The method avoids breakdown by attenuating the input power to the final stage during overvoltage conditions, thus limiting the output collector swing. This is accomplished by a feedback control system, which detects the peak voltage at the output collector node and clamps its value to a given threshold by varying the circuit gain. Indeed, the control loop is unlocked in the nominal condition and it acts when an output mismatching condition is detected. A control circuit also allows a supply-independent collector-clamping threshold to be accurately set.

The invention discloses a C-waveband high-power solid-state power amplifier. The power amplifier comprises a drive stage power amplifier, a final stage power amplifier, a monitoring unit and a power supply. The final stage power amplifier comprises a one-to-eight splitter, first to eighth hot plug power amplifiers and an eight-in-one combiner; the splitter and the combiner are mutually isolated with the hot plug power amplifiers respectively through a binary Wilkinson power splitting circuit and a high power waveguide magic T; and the hot plug power amplifiers realize electrified hot plug through controlling power supply and detecting an output power and a reflection power. According to the power amplifier provided by the invention, the electrified hot plug of the final stage power amplifier is realized in adoption of the splitter / combiner with isolated ports and the modularized hot plug power amplifiers; the device maintainability is improved; the system stability is enhanced; and in adoption of eight-way hot plug power amplifiers, the 1KW power output of the continuous waves is realized through parallel power combination.

An all-solid-state marine radar technology based on a non-rotating cylindrical array antenna is described. Multiple transmit / receive (T / R) modules are used to form the antenna beam, which allows the beam sequencing, the dwell time in each beam position, the resolution, and the beam shape to be varied in order to make best use of the available energy. Waveforms with a high duty ratio can be used on transmit in order to make efficient use of solid-state power amplifiers. High resolution in both range and Doppler provides high measurement accuracy and superior performance in clutter. Alternate embodiments, including continuous waveform embodiments are disclosed.

Radio frequency (RF) power amplifiers are provided which may include high power, wideband, microwave or millimeter-wave solid state power amplifiers based on waveguide power combiner / dividers.

A solid state power amplifier (SSPA) system may include a radio frequency (RF) input, an RF waveguide split block, multiple monolithic microwave integrated circuit (MMIC) power amplifier modules, and / or a heat spreader. An MMIC power amplifier module may include a backing, a board, at least one MMIC, and / or a cover. A method for dissipating heat within an SSPA may include receiving an RF signal, splitting the RF signal, amplifying multiple RF signals, combining the multiple RF signals, generating heat, and / or dissipating heat.

The invention discloses a hybrid pre-distortion linearizer with wide application range. The hybrid pre-distortion linearizer comprises a power divider and a synthesizer, wherein output ports of the power divider are in one-to-one connection with input ports of the synthesizer through a series transmission type analog pre-distortion circuit or a parallel transmission type analog pre-distortion circuit. The linearizer synthesizes multiple nonlinear signals with different characteristics to obtain the required spectrum and phase pre-distortion signals, overcomes the shortcomings that independent series and parallel transmission type analog pre-distortion circuits can only produce pre-distortion signals suitable for solid-state power amplifiers and most reflection-type pre-distortion circuits can only produce pre-distortion signals suitable for millimeter wave traveling-wave tube power amplifiers, can realize the nonlinear pre-distortion linearization for the millimeter wave traveling-wave tube power amplifiers and the solid-state power amplifiers, has wide application range, and is suitable for being popularized in the technical field of millimeter wave linearization.

A high power, high frequency, solid state power amplifier system includes a plurality of input multiple port splitters for receiving a high-frequency input and for dividing the input into a plurality of outputs and a plurality of solid state amplifier units. Each amplifier unit includes a plurality of amplifiers, and each amplifier is individually connected to one of the outputs of multiport splitters and produces a corresponding amplified output. A plurality of multiport combiners combine the amplified outputs of the amplifiers of each of the amplifier units to a combined output. Automatic level control protection circuitry protects the amplifiers and maintains a substantial constant amplifier power output.

The invention provides a Loran-C transmitter main circuit and a transmission waveform generation method therefor. The main circuit comprises a plurality of solid-state power amplifier units of a D type, a plurality of synthesis transformers, and a matching tuning unit. The solid-state power amplifier units of the D type and the plurality of synthesis transformers combine a stepped voltage waveform consistent with a reference excitation voltage waveform, and the matching tuning unit is used for generating a transmitted Loran-C current waveform through the combined stepped voltage waveform. The high-efficiency characteristics of the solid-state power amplifier units of the D type enable the overall efficiency of a transmitter to be greatly improved. The solid-state power amplifier units of the D type and the synthesis transformers are in series-parallel connection to expand the capacity, thereby meeting the requirements of different power levels, such as the levels from 100kW to 2MW. The transmitter does not need to be repeatedly designed in engineering realization for different demands. Meanwhile, the Loran-C transmitter is enabled to achieve the full-digital step wave combination in the whole Loran pulse time period.

The invention provides a satellite-borne data transmission transmitter using a microwave direct modulation technique. A shell is a cuboid structure, the upper and lower surfaces thereof are both provided with sunken shielding grooves, and outer side of the upper surface of the shell is anticlockwise provided with a frequency source, a first isolator, a microwave modulator, an exciting amplifier, a band-pass filter, a solid state power amplifier, and a second isolator in sequence. A coding circuit is located in a single shielding groove in the centre of the upper surface of the shell, the frequency source and the first isolator are arranged in the same shielding groove, the microwave modulator and the exciting amplifier are arranged in the same shielding groove, and the shielding covers of the three shielding groove are top cover plates of a first machine case. A power amplifier and the second isolator are arranged in the same shielding groove, the shielding cover is the top cover plate of a second machine case, and an output filter is located above the solid state power amplifier and fixed above the top cover plate of the second machine case. A 38-core electric connector is mounted on the side wall of the shell. A power supply circuit is arranged on the lower surface of the shell. The data transmission transmitter in the invention has small volume, light weight and strong electromagnetic compatibility, and is conveniently disassembled.

The invention relates to a microwave solid-state power amplifier. The power amplifier works at the environmental temperature ranging from -45 DEG C to +65 DEG C and is used for amplifying a beacon signal and a remote signal between the star and the ground in the communication task, and the solid-state power amplifier adopts multi-stage amplifier cascading, the power amplifier comprises a preamplifier, a driving power amplifier and a final power amplifier connected in series orderly; a microwave signal input end is connected with an input end of the preamplifier, an radio frequency input and output end of each amplifier circuit is connected with a micro-strip isolator; two X-waveband cavity band-pass filters are respectively connected between the microwave signal input end and the preamplifier input end and between an output end of the preamplifier and an input end of the driving power amplifier. The preamplifier also comprises a small signal amplifier and a high-gain microwave integrated power amplifier which are connected in series orderly.

The invention relates to a power control circuit, especially to a power control circuit and a power control method of a solid-state power amplifier. The invention provides the power control circuit and the power control method of a solid-state power amplifier to solve the problems in the prior art. An automatic level control loop and an amplitude limiter are adopted to realize the circuit. The circuit ensures that the output power is constant without changing while the input power and the temperature of a solid-state power amplifier change, and has an input over-excitation protection function for a radio frequency amplification link during locking of the automatic level control loop. The automatic level control loop is used for stabilizing an output power value P2 of the automatic level control loop as an output power set value P2-bar if the amplitude of an input signal power value Pin changes, and when the output power value P2 of the automatic level control loop passes by the amplitude limiter and the radio frequency link, formed output power Pout is stabilized as an output power set value Pout-bar.

The invention relates to the technical field of solid state power amplifiers, and discloses an over excitation protection circuit of a solid state power amplifier. The over excitation protection circuit specifically comprises an automatic level control loop and a switch control loop. A threshold of the automatic level control loop is set to stabilize over excitation input power at a certain rated power level; and a time delay or a threshold of the switch control loop is set to turn on a radio frequency switch after the automatic level control loop starts to control, so as to prevent an over excitation signal prior to control from entering a radio frequency amplification link. By means of the cooperative use of the two circuits, when an over excitation signal is input, subsequent equipment is protected, and meanwhile, the amplitude of the input over excitation signal is controlled instead of simply preventing over excitation by the on-off of a time delay switch used in the prior art. A universal over excitation protection device limiter is not used in the over excitation protection circuit disclosed by the invention, thereby avoiding the deterioration of such indexes as transmission system harmonics, third-order cross modulation, noise coefficient and the like. The invention further discloses an implementation method of over excitation protection circuit of the solid state power amplifier.

The invention relates to a double-layer multi-channel power synthesis amplifier based on rectangular waveguide, which comprises a power divider, a synthesizer and an amplifier chip array, wherein the amplifier chip array is clamped between the power divider and the synthesizer, and comprises a metal strip and a group of solid-state power amplifier chips fixed on the metal strip. The power divider and the synthesizer are identical in structure and respectively comprise two cuboid metal blocks, wherein a bottom face rectangular waveguide slot is arranged on the bottom face of each upper metal block, and a top face rectangular waveguide slot is arranged on the top face of each lower metal block. The bottom face rectangular waveguide slot and the top face rectangular waveguide slot are combined to form a rectangular waveguide cavity, and one end of a coaxial line extends into a branch waveguide cavity. The input end of each solid-state power amplifier chip is connected with the other end of the coaxial line corresponding to the power divider through a microstrip line, and the output end of each solid-state power amplifier chip is connected with other end of the coaxial line corresponding to the synthesizer. The double-layer multi-channel power synthesis amplifier has the advantages of being high in synthesizing efficiency, large in power capacity, wide in working bandwidth, good in radiating performance and the like.

A method of fabricating a solid state power amplifier (SSPA) having variable output power is provided. The method includes coupling a first transistor device to a second transistor device and biasing a drain input of each of the first and second transistor device. Further, the method includes biasing a gate input of each of the first and second transistor device varying a drain to source current of each of the first and second transistor device to enable the SSPA to maintain high power added efficiency (PAE) and consistent linearity over a range of output power levels.

The invention discloses a power amplifier module carrying device in a satellite communication system, comprising a shell and a heat radiating plate. A work room is arranged above the heat radiating plate, and a heat radiating room is arranged below the heat radiating plate. Baffles are arranged inside the work room, the baffles contact a GaN power amplifier module. An air inlet pipe and a heat radiating fan are arranged above the GaN power amplifier module. The baffles penetrate through the heat radiating plate to the bottom of the heat radiating room. An overflow plate is arranged on each baffle. The heat radiating room is provided with a spray plate inside, and sprinkler heads are arranged on the spray plate. The water pipes inside the sprinkler heads are connected with a main water pipe arranged inside the spray plate. The main water pipe penetrates through the side of the heat radiating room and is connected with a water inlet pipe. The water inlet pipe is connected with a micro water pump. The micro water pump is connected with a cooler through a water pipe. A water outlet pipe is arranged below the water inlet pipe, and the water outlet pipe is communicated with the heat radiating room and the cooler. The temperature of a GaN power amplifier module in a solid-state power amplifier is efficiently reduced by a main water cooling system and an auxiliary air cooling system, so the work efficiency of the GaN power amplifier module is improved, and the room for improvement of the solid-state power amplifier is improved.

The invention provides a novel bandwidth solid state power amplifier having an interpenetrating type design. A structural design that power synthesizers and radiators are interpenetrated is adopted, so a space resource is fully utilized. As a heat pipe three-dimensional cross embedded distribution is adopted by the radiators, the heat dissipation efficiency is effectively improved; branches of the power amplifier are respectively provided with an amplitude-phase adjuster, so the consistency between an amplitude and a phase of each branch can be adjusted, thereby improving the synthetic efficiency. By adopting the above scheme, an applicable frequency range of the bandwidth solid state power amplifier complete machine can cover a plurality of frequency bands of microwave and millimeter waves, and an output power can be flexibly adjusted according to bandwidth requirements of different frequency bands and a specific power device.

An audio amplifier apparatus and method which has a preamp, active 2-way crossover, solid-state power amplifier, and tube power amplifier. Audio input from a musical instrument enters the preamp where pre-amplification, equalization, and other processes such as limiting or compression take place. Audio leaves the preamp and goes to a crossover, wherein frequencies below a crossover point are sent to a solid-state power amp via a first signal path, and wherein audio frequencies above the crossover point are sent to a tube power amp via a second signal path. Outputs from the solid-state power amp and tube power amp are sent to external or internal loudspeakers.

The present invention belongs to the field of microwave solid state power amplifier, relates to a solid state power amplification and fault diagnosis, and provides a solid state power amplification fault diagnosis method based on a fuzzy fault tree and a Bayesian network. The method combines the advantages of both fuzzy fault tree and Bayesian network, converting the T S fuzzy fault tree into the Bayesian network, then performing derivation according to a rule of Bayesian network to obtain an important degree of each basis event, namely a component fault, and finally performing fault dropping according to the magnitude of important degree, so as to achieve fault diagnosis. The solid state power amplification fault diagnosis method provided in the present invention not only fills the blank of solid state power amplication fault diagnosis field, but also is simple in calculation and more practical due to combination of the advantages of both fuzzy fault tree and Bayesian network compared with the traditional fault diagnosis method.

The invention discloses a Ku band solid state power amplifier, comprising heat dissipation systems, amplifier modules, a control and detection module, a six-way power divider and a power module. An output end of the six-way power divider is connected with six groups of amplifier modules. Power-on and protection of the amplifier modules are controlled by the control and detection module. Heat dissipation systems are set at two sides of the whole of the amplifier modules and the control and detection module. The heat dissipation systems, the amplifier modules, the control and detection module and the six-way power divider are connected with the power module. According to the design, bare chips are employed, so a structure is compact and beautiful; a sink form is employed for a link, so the disassembly and maintenance are convenient; and through combination of gallium arsenide chips and gallium nitride chips, an amplifier assembly has relatively good linearity and more has relatively highefficiency. The design plays a role in the fields such as a radar simulation device and electronic countermeasure.

An all-solid-state marine radar technology based on a non-rotating cylindrical array antenna is described. Multiple transmit and receive modules are used to form the antenna beam, which allows the beam sequencing, the dwell time in each beam position, the resolution, and the beam shape to be varied in order to make best use of the available energy. Waveforms with a high duty ratio can be used on transmit in order to make efficient use of solid-state power amplifiers. High resolution in both range and Doppler provides high measurement accuracy and superior performance in clutter. Alternate embodiments, including continuous waveform embodiments are disclosed.

A fiber coupled modular laser system comprises a laser oscillator, at least one fiber pre-amplifier, and at least one free space solid state power amplifier. The output of the laser oscillator is fiber coupled with the input of the at least one fiber pre-amplifier or the at least one free space solid state power amplifier. The output or the input of the at least one fiber pre-amplifier is fiber coupled with the input or the output of the at least one free space solid state power amplifier.

The invention provides a ship navigation radar based on a double-system transmitter. The radar is characterized in that a display terminal subsystem inputs a control signal, a control circuit is used to carry out driving and an emission mode is selected; under an emission state, firstly, the control circuit makes a control signal generate a corresponding wave-shaped signal, a solid state power amplifier amplifies the signal, a large power switch gates and transmits the signal to an antenna via a circulator and then the signal is radiated to a space; and then the control circuit controls a modulation circuit, a magnetron is used to generate a large power emission signal of a frequency required by the system, and the large power switch gates and transmits the signal to an antenna via a circulator and then the signal is radiated to the space; under a receiving state, a receiving signal is transmitted via the circulator, after low noise amplification of high amplification and mixing amplification of medium amplification, the signal is transmitted to a receiver, and after sampling and signal processing, a display terminal displays a detection result; and the display terminal subsystem inputs the control signal and controls servo so as to control a rotation state of an antenna feeder subsystem. The radar can consider short distance blind area detection and far-end beacon source triggering.