10results about "Frequency-independant attenuators" patented technology

The present disclosure discloses a phase shift attenuation circuit, a phase shift attenuation network, and a radio frequency (RF) microwave system. The phase shift attenuation circuit comprises a plurality of first differential circuits electrically connected in sequence; an electrical connection between two adjacent first differential circuits of the plurality of first differential circuits including at least one of a straight-through connection or a connection through an attenuator unit; wherein the phase shift attenuation circuit realizes 8-bit step attenuation through the attenuator unit; 7-bit step attenuation among the 8-bit step attenuation is configured to realize a phase shift function, and the 8-bit step attenuation is configured to realize phase shift and attenuation functions. The phase shift attenuation circuit is constructed based on a differential circuit architecture, and is capable of simultaneously realizing the phase shift and attenuation functions by the same circuit.

The application provides a pulse radiator, relates to the field of microwave radio frequency technology, and comprises a radio frequency multistage amplification link and a measurement and control communication component; the radio frequency multistage amplification link generates an output pulse signal; the measurement and control communication component performs real-time monitoring and regulation on the output pulse signal, and is configured with a self-adaptive degradation fault prevention shutdown control strategy. In a continuous radiation working mode, operating state parameters are continuously acquired; when the operating state parameters reach a preset warning limit, the self-adaptive degradation control is triggered, a dynamic attenuation control code is issued to reduce the output gain to enter a degradation working mode; during the degradation working mode, the parameter development trend is continuously monitored; when the parameters recover to a safe interval, the dynamic attenuation control code is reversely adjusted to smoothly recover the output gain to the initial setting state. The application prevents hard power-off shutdown of the equipment caused by abnormal working conditions, and maintains continuous radiation of the signal.

There is provided a variable attenuator including: a transmission line which has an open stub that is connected between an input and an output of the variable attenuator; a first switch which is connected between the input and a reference potential; and a second switch which is connected between the output and the reference potential.

The application provides a high-isolation transceiving simultaneous frequency conversion assembly, which comprises independently controlled SC frequency band receiving and transmitting links, X frequency band receiving and transmitting links, an SC frequency band transmitting intermediate frequency input port (J2) connected with the SC frequency band receiving and transmitting links, an SC frequency band receiving intermediate frequency output port (J1), an SC frequency band receiving radio frequency input port (J5), an SC frequency band transmitting radio frequency output port (J6), an X frequency band transmitting intermediate frequency input port (J3) connected with the X frequency band receiving and transmitting links, an X frequency band receiving intermediate frequency output port (J4), an X frequency band receiving radio frequency input port (J8), an X frequency band transmitting radio frequency output port (J7) and an interface (J9) for realizing connection of a low-frequency connector and an interference technology unit. The high-isolation transceiving simultaneous frequency conversion assembly can solve the problem of high-isolation transceiving simultaneity and achieve the goal of miniaturization.

This invention relates to an automatically adjustable radio frequency (RF) attenuation circuit. It includes a detector unit, an RF switch, and an attenuation unit. The detector unit outputs a control voltage based on the magnitude of the input RF signal, driving the RF switch and attenuation unit to automatically switch between multiple attenuation levels. The attenuation unit is constructed using a π-type resistor network and switching diodes, with input and output voltage standing wave ratios (VSWRs) both less than 1.3. This invention requires no external control and can automatically adjust the attenuation based on the input signal amplitude. It is suitable for high-frequency and small-signal scenarios and has the advantages of low cost and stable performance.

This invention discloses an RF power amplifier module and its power protection method. The module includes a controller chip, an RF power amplifier chip, and a filter connected in sequence. The controller chip is connected to a power supply voltage VCC that powers the RF power amplifier chip. The controller chip detects the power supply voltage VCC and outputs a limiting bias voltage that increases with the increase of the power supply voltage VCC when VCC exceeds a set threshold. The RF power amplifier chip includes a limiting circuit and a power amplifier unit. The limiting circuit limits and attenuates the RF input signal according to the limiting bias voltage to obtain an attenuated RF signal. The power amplifier unit amplifies the attenuated RF signal before outputting it. The filter filters the amplified RF signal to output an RF signal in the target frequency band. This invention can adaptively change the limiting degree according to the power level and improve the speed of power detection.

The application discloses a power amplifier power control method and device, relates to the field of radio frequency technology, and comprises the following steps: setting a first electrically tunable attenuator and a second electrically tunable attenuator in a radio frequency signal channel; constructing an overexcitation protection control loop through the first electrically tunable attenuator; comparing a direct current voltage converted from an output signal through a radio frequency detector with a preset threshold voltage; adjusting the attenuation of the first electrically tunable attenuator; maintaining the stability of output power when the input signal exceeds a set power threshold; triggering a latch when the radio frequency signal is overcurrent or abnormal reflection; cutting off the control voltage of the first electrically tunable attenuator to enter a maximum attenuation state; realizing continuous gain adjustment and temperature compensation through the second electrically tunable attenuator; dynamically adjusting the control voltage of the second electrically tunable attenuator according to a temperature gain compensation algorithm through a micro control unit; and maintaining the stability of output power in a wide temperature range. The application considers rapid protection, continuous gain adjustment and accurate temperature compensation, and improves the reliability and stability of a PA in complex working conditions.

The application discloses a kind of radio frequency signal source output power control method, the method includes: the output power range of standard radio frequency signal source and the numerical control attenuation range of numerical control attenuator are divided to obtain multiple control regions, the boundary point of each control region corresponds an output power, a frequency and a numerical control attenuation quantity;Each control region is constructed standard corresponding relationship based on the numerical control attenuation quantity corresponding to the voltage control attenuator;Based on the standard corresponding relationship, target frequency and target power, control the radio frequency signal source to be controlled, can accurately control the power required by radio frequency signal source output, avoid the larger error of output power.

This utility model discloses a seven-digit digitally controlled attenuator based on GaAs technology, belonging to the field of attenuator technology. It includes seven digitally controlled attenuator units connected in series and a drive control circuit that controls the operation of each digitally controlled attenuator unit. The seven digitally controlled attenuator units are connected sequentially in ascending order of attenuation. Each digitally controlled attenuator unit corresponds to a drive module, and the drive control method is used to control each digitally controlled attenuator unit, so that the digitally controlled attenuator operates at its corresponding attenuation position. Furthermore, sector capacitors are connected to the switches of the first, second, sixth, and seventh attenuator units, which helps to improve the attenuation flatness of the attenuator.

The application provides a radio frequency attenuator circuit and a compensation method thereof, which comprises a plurality of attenuation modules with different attenuation amounts connected in sequence; the plurality of attenuation modules comprise M first attenuation modules and N second attenuation modules, the attenuation amounts of the N second attenuation modules are all smaller than the attenuation amounts of the M first attenuation modules; n second attenuation modules among the N second attenuation modules are provided with compensation branches; wherein, 1≤n≤N, each second attenuation module among the n second attenuation modules is provided with at least one compensation branch; for the second attenuation module provided with a plurality of compensation branches, the plurality of compensation branches are connected in parallel, thus, the dynamic compensation branches are provided for the small attenuation modules affected by the state of the large attenuation modules, the inter-stage isolation inductance is eliminated, the chip area is reduced under the premise of ensuring the attenuation precision, the phase fluctuation is controlled in a very small range, and the core performance requirements of the gain control module of the phased array system are met.