44results about "Frequency-independant attenuators" patented technology

The present application discloses a phase shift circuit and a radio frequency microwave system. The phase shift circuit may comprise: a first node circuit, a second node circuit, and a first signal channel and a second signal channel coupled between the first node circuit and the second node circuit, wherein the first node circuit is configured to split an input signal so as to simultaneously output a first differential signal to the first signal channel and a second differential signal to the second signal channel; the first signal channel and the second signal channel are implemented on the basis of a differential circuit architecture, and are configured to respectively perform signal attenuation and / or quadrant transformation on the first differential signal and the second differential signal, so as to implement phase shift; the second node circuit is configured to synthesize a first phase-shifted signal output by the first signal channel and a second phase-shifted signal output by the second signal channel so as to obtain an output signal; and the phase difference between the output signal and the input signal is within the range of 0-360 degrees.

An electronic device may include a signal path that conveys a signal. The device may include an attenuator on the signal path that attenuates the signal. The attenuator may be free from series switches on the signal path. The attenuator may include a transmission line segment coupled in series between an input and an output of the attenuator. The transmission line segment may extend from a first terminal to a second terminal. A first adjustable resistance may couple the first terminal to ground. A second adjustable resistance may couple the second terminal to ground. The transmission line segment may have a length configured to perform impedance matching for the attenuator. A controller may control an attenuation level of the signal attenuator by adjusting the magnitude of the adjustable resistances. The controller may include a servo loop around an operational amplifier to mitigate process, voltage, and temperature variations in the attenuator.

The invention provides a broadband gain positive slope amplitude-phase control multifunctional chip for a T / R assembly, which relates to the technical field of radio frequency integrated circuits and comprises a receiving channel, a transmitting channel, an equalization circuit, a numerical control attenuator, a numerical control phase shifter, a transmitting-receiving change-over switch module and a parallel control module. The parallel control module is used for outputting parallel control signals to the numerical control attenuator, the numerical control phase shifter and the transceiving change-over switch module; the equalization circuit is respectively connected with the receiving channel and the transmitting channel through the transmitting-receiving change-over switch module, so that a signal path of the receiving channel and a signal path of the transmitting channel multiplex the equalization circuit, the numerical control attenuator and the numerical control phase shifter; and the equalization circuit is of an on-chip integrated structure and is used for adjusting the gain of the receiving channel and the gain of the transmitting channel to present a positive slope characteristic relative to the frequency in a wide frequency band so as to compensate the frequency attenuation of an external device.

The present application relates to a kind of methods for controlling digital attenuator in signal source power calibration, wherein the method comprises the following steps: start control host, signal source, power meter and establish communication connection between each other;Control host sends instruction to signal source, carries out parameter configuration;The power cache table of digital attenuator and power calibration record table are built;The initial code value of digital attenuator is set to obtain the actual output power of signal source;Inquire whether there is cached power record, if yes, directly use, if not, obtain actual output power from the power meter, and the test result is used to update the power cache table of the digital attenuator;The present application also relates to a corresponding device, processor and computer readable storage medium thereof.The signal source power calibration method for controlling digital attenuator, device, processor and computer readable storage medium thereof are used, and the calibration efficiency of signal source power is effectively improved.

The invention provides a K-band receiving component chip circuit device, which belongs to the technical field of radio frequency integrated microsystems and comprises a gallium arsenide low-noise amplification circuit and a silicon-based amplitude-phase multifunctional circuit. The gallium arsenide low-noise amplification circuit is located at the front end of the receiving link; the silicon-based amplitude-phase multifunctional circuit comprises a driving amplification circuit, a numerical control attenuation circuit, a numerical control phase shift circuit and a power distribution circuit. The output end of the gallium arsenide low-noise amplification circuit is connected with the input end of the driving amplification circuit, the output end of the driving amplification circuit is connected with the input end of the numerical control attenuation circuit, the output end of the numerical control attenuation circuit is connected with the input end of the driving amplification circuit, and the output end of the driving amplification circuit is connected with the input end of the numerical control phase shift circuit. The output end of the numerical control phase shift circuit is connected with the input end of the power distribution circuit, and the output end of the power distribution circuit is connected with the COM end. According to the invention, a complex circuit is simplified, the occupation of large-scale simulation on resources is reduced, the simulation time is shortened, and different K-band scenes are adapted.

The invention discloses a radio frequency signal source output power control method, and the method comprises the steps: dividing the output power range of a standard radio frequency signal source and the numerical control attenuation range of a numerical control attenuator to obtain a plurality of control regions, and enabling the boundary point of each control region to correspond to one output power, one frequency and one numerical control attenuation; constructing a standard corresponding relation for each control area based on the voltage-controlled attenuation amount corresponding to the voltage-controlled attenuator; and controlling the to-be-controlled radio frequency signal source based on the standard corresponding relation, the target frequency and the target power, thereby accurately controlling the power required by the output of the radio frequency signal source, and avoiding a relatively large error of the output power.

A PIN diode electrically controlled attenuation circuit comprises a radio frequency main link and a direct current bias circuit, the positive electrode of a PIN diode D1 is connected with the negative electrode of a PIN diode D2 through a microstrip circuit 1, and the negative electrode of the PIN diode D1 is connected with one end of a capacitor C1; the positive electrode of the PIN diode D4 is connected with the negative electrode of the PIN diode D3 through the microstrip circuit 4, and the negative electrode of the PIN diode D4 is connected with one end of the capacitor C2; the positive electrode of the PIN diode D2 is connected with one end of the microstrip circuit 2, the positive electrode of the PIN diode D3 is connected with one end of the microstrip circuit 3, and the other end of the microstrip circuit 2 is connected with the other end of the microstrip circuit 3; a driving current Ic is connected with one end of a capacitor C3 and one end of a resistor R6, the other end of the resistor R6 is connected with one end of an inductor L4, the other end of the inductor L4 is connected to one end of an inductor L3 and one end of a capacitor C4, the other end of the capacitor C3 and the other end of the capacitor C4 are respectively grounded, the other end of the inductor L3 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with the other end of the microstrip circuit 2 and the other end of the microstrip circuit 3. The circuit is simple, the attenuation dynamic range is enlarged, and attenuation stability is improved.

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 invention discloses an automatic gain control adjusting circuit for a radio frequency receiver and an adjusting method of the automatic gain control adjusting circuit. The automatic gain control adjusting circuit comprises a radio frequency main circuit and an adjusting branch circuit, the radio frequency main circuit comprises a plurality of voltage-controlled attenuators, a plurality of amplifiers, a plurality of fixed attenuators and a one-to-two power divider which are connected in sequence, the plurality of voltage-controlled attenuators, the plurality of amplifiers, the plurality of fixed attenuators and the one-to-two power divider are cascaded in sequence, one end of the output end of the one-to-two power divider outputs signals, and the other end of the output end of the one-to-two power divider is connected with the adjusting branch circuit; the detector, the operational amplifier and the voltage-controlled attenuator cyclically and automatically adjust the power of the output radio-frequency signal, so that the output power of the radio-frequency signal is controlled within a smaller power range.

A multi-level digital step attenuator (DSA) with a hybrid attenuation circuit is shown. The hybrid attenuation circuit is coupled between an input node and an output node of the multi-level DSA. The bypass switch of the multi-level DSA is controlled to provide a bypass path between the input node and the output node of the of the multi-level DSA when the hybrid attenuation circuit is in a disabled state. In the first active state, the hybrid attenuation circuit is switched to form a T-type structure to provide a first amount of signal attenuation. In the second active state, the hybrid attenuation circuit is switched to form a Pi-type structure to provide a second amount of signal attenuation.

The application discloses a precision-adjustable wideband temperature compensation circuit based on a gallium arsenide process and relates to the technical field of integrated circuits.The circuit comprises a temperature compensation driving module, a temperature compensation attenuation module and a temperature compensation precision control logic module.The temperature compensation driving module senses environmental temperature changes through a clamping circuit and a differential network and outputs an analog control voltage.The temperature compensation attenuation module comprises a plurality of parallel controllable attenuation units, each of which comprises two series-connected transistors, and the on-off of each controllable attenuation unit is controlled by a switch signal of the control logic module and the attenuation amount of each controllable attenuation unit is controlled by an analog voltage of the driving module.The control logic module controls the conduction of different numbers of attenuation units by receiving an external TTL signal, so that the multi-gear adjustment of the overall temperature compensation precision is realized.The application overcomes the shortcomings of the traditional temperature compensation circuit, such as unadjustable precision and narrow frequency band, and has the advantages of wide working frequency band, adjustable temperature compensation precision, compact structure and easy integration, and is suitable for high-performance millimeter wave communication systems.

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.

A phase-shifting circuit and a radio frequency microwave system are provided. The phase-shifting circuit includes a first node circuit, a second node circuit, and a first signal channel and a second signal channel coupled between the first node circuit and the second node circuit. The first node circuit is configured to split an input signal to simultaneously output a first differential signal to the first signal channel, and output a second differential signal to the second signal channel. The first signal channel and the second signal channel are implemented based on an architecture of a differential circuit, and configured to perform at least one of a signal attenuation and a quadrant transformation on the first differential signal and the second differential signal for phase-shifting. The second node circuit is configured to synthesize a first phase shift signal output by the first signal channel and a second phase shift signal output by the second signal channel to obtain an output signal, and a phase difference between the output signal and the input signal is within a range of 0 deg-360 deg.

A bidirectional amplifier module and an adjustment method are provided. The purpose of the present invention is to adjust an RF output level to a predetermined output level without degrading a transmission RF signal. The present invention is provided with: an antenna-side terminal; a main body-side terminal; a signal amplification circuit provided between the antenna-side terminal and the main body-side terminal and capable of adjusting the amplification factor of the transmission RF signal; a state detection unit that detects whether a transmission state or a reception state; an output level detection unit that detects an RF output level of the antenna; and a control unit that switches the transmission / reception state of the signal amplification circuit, the control unit acquires the RF output level from the output level detection unit when the transmission state is detected by the state detection unit, and when a transition from the transmission state to the reception state is detected by the state detection unit, the control unit outputs the RF output level from the output level detection unit after a predetermined standby time has elapsed. The state detection means confirms whether or not the reception state has been continuously detected, and if it is confirmed that the reception state has been continuously detected, adjusts the amplification factor of the transmission RF signal on the basis of the acquired RF output level.

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 discloses a low-additional phase shift digital attenuator with amplitude calibration function and a design method, belongs to the field of digital attenuators in millimeter wave phased array T / R component integrated circuits, and comprises a plurality of attenuation units with different attenuation amounts, and the attenuation units with different attenuation amounts are connected together in stages; and comprises an amplitude error calibration unit and a phase shift compensation unit, the amplitude error calibration unit is connected with the attenuation unit, and is used for combining with the attenuation unit to realize a required attenuation bit and compensate an amplitude error; and the phase shift compensation unit is used for compensating an additional phase shift. The application has effective benefits of low attenuation amplitude error and low attenuation additional phase shift.

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.

A resonator device includes a substrate with a first number of fins extending over the substrate. The fins extend along the substrate in a first direction. A second number of conductive fingers are provided over the fins, which extend in a second direction perpendicular to the first direction. The first number is less than or equal to the second number. The conductive fingers are configured to receive an input signal such that the conductive fingers resonate at an output frequency. The conductive fingers define a finger pitch therebetween, and the output frequency is based on the finger pitch.

The invention belongs to the technical field of signal processing, and particularly relates to a low-video feed-through pulse modulation device and method, and the device comprises a radio frequency switch which is configured to receive a radio frequency input signal and respond to a control signal for switching on and off, so as to carry out the pulse modulation of the radio frequency input signal; the high-pass filter is connected with the radio frequency switch, and the high-pass filter is configured to filter video feed-through signals generated by the radio frequency switch in the pulse modulation process; the pulse modulation driving circuit is connected with the radio frequency switch, and the pulse modulation driving circuit is configured to output a control signal to the radio frequency switch so as to control the on-off of the radio frequency switch; the radio frequency amplifier is arranged at the rear stage of the high-pass filter, and the radio frequency amplifier is configured to amplify the radio frequency input signal. According to the device, the high-pass filter is arranged at the rear stage of the radio frequency switch, so that the defect of large video feed-through of the radio frequency switch is effectively overcome on the basis of keeping the high modulation speed of the radio frequency switch.

A system for filter enhancement, preferably including one or more analog taps and a controller, and optionally including one or more couplers. The system is preferably configured to integrate with a filter, such as a passband filter or other frequency-based filter. The system can be configured to integrate with an RF communication system, an RF front end, or any other suitable RF circuitry. A method for filter enhancement, preferably including configuring one or more analog taps, and optionally including calibrating a system for filter enhancement and / or receiving temperature information.

The invention relates to the technical field of numerical control attenuator structure design, in particular to a millimeter wave attenuator high and low temperature compensation circuit. Comprising a first control unit, a second control unit and a temperature compensation unit, by arranging the temperature compensation unit, when the introduced bias voltage rises, the threshold voltage of the first control unit and the second control unit is reduced, so that the on-resistance is reduced, the trend that the on-resistance is increased when the temperature rises is counteracted, and the on-resistance is kept unchanged as much as possible when the temperature rises; reference state insertion loss and attenuation of the attenuator are kept unchanged.

The invention belongs to the technical field of integrated circuit design, and provides a high-precision gain control circuit which comprises an adjustable attenuation network and two variable gain amplifiers which are arranged at the input end and the output end of the adjustable attenuation network respectively and are of the same structure. The variable gain amplifier comprises a first adjustable coupling attenuation matching network, a variable gain transistor network and a second adjustable coupling attenuation matching network which are cascaded in sequence; the adjustable attenuation network is used for reducing a parasitic phase generated in a gain control process; m thin metal coupling attenuation coils and N thin metal coupling attenuation coils are respectively arranged in the first adjustable coupling attenuation matching network and the second adjustable coupling attenuation matching network; the two ends of each coupling attenuation coil are grounded, on-off of each coupling attenuation coil is controlled by a transistor, adjustment of different gain gears is achieved by controlling the conduction positions and the conduction number of the coupling attenuation coils, and the gain control precision is further improved.

The application provides a kind of satellite-borne solid-state power amplifier control and telemetry circuit, comprising: detection diode, four-way operational amplifier, stabilivolt, two-way operational amplifier and double negative voltage controlled attenuator;The detection diode is connected with microwave coupler;Four-way operational amplifier is connected with positive power voltage;The stabilivolt is connected with four-way operational amplifier output end;The two-way operational amplifier is connected with positive and negative power voltage;Double negative voltage controlled attenuator is connected with two-way operational amplifier two output ends;When input power increases, the direct current voltage that detection diode detects increases, the detection voltage that four-way operational amplifier input increases, the control positive pressure 1 that four-way operational amplifier output increases, the control negative pressure 1 that two-way operational amplifier output increases, so that the attenuation value of double negative voltage controlled attenuator increases, and input power decreases.After reaching dynamic balance, input power maintains the level before change, and output power does not change.

Methods and apparatus for an absorptive, phase invariant signal attenuator. In embodiments, PIN diodes (111, 114) can be coupled to a hybrid coupler (106). Incident power can be split by the coupler (106) to a terminating resistor (118), a terminating diode (114), and a series diode (111). The terminating diode (114) becomes increasingly well matched and absorptive over the attenuation range. The series diode (111) becomes increasingly mismatched and reflective over the attenuation range. The terminating resistor (118) increasingly absorbs incident power as the coupling value decreases due to increasing diode impedance over the attenuation range.

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.

A phase shifter with controllable attenuation and a method for controlling the phase shifter is disclosed, the phase shifter comprising a plurality of transmission line segments (220) coupled in series, wherein each said transmission line segment (220) comprises an attenuation circuit (230), selectively couplable between a signal line (222) of the transmission line segment (220) and ground to selectively attenuate a signal propagating through the transmission line segment (220). Each transmission line segment (220) of a coplanar waveguide is switchable by switches (S0) between a first configuration with outer conductors (224) closer to the signal line (222) providing a first phase shift (220) and a second configuration with outer conductors (226) farer from the signal line (222) providing a second phase shift, greater than said first phase shift. Insertion loss variations between different phase states are mitigated by switchable equalizing resistors incorporated in the attenuation resistors (230). Switchable capacitors (C2) are connected to the signal line for compensation of variation of characteristic impedance between phase states. Switchable capacitors (C1) are connected to the signal line for compensation of switch capacitances between attenuation states.

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 relates to the technical field of sensor signal processing, in particular to a vibrating string sensor anti-interference circuit and device, which comprises an interference suppression circuit, a differential amplification circuit, a clamping circuit, a low-pass filter circuit, a zero-crossing detection circuit and a processing module; an input end of the interference suppression circuit is used for connecting a vibrating string sensor; an output end of the interference suppression circuit is connected to an input end of the differential amplification circuit; an output end of the differential amplification circuit is connected to an input end of the clamping circuit; an output end of the clamping circuit is connected to an input end of the low-pass filter circuit; an output end of the low-pass filter circuit is connected to an input end of the zero-crossing detection circuit; and an output end of the zero-crossing detection circuit is connected to the processing module. The application has the effect of removing interference signals to obtain accurate to-be-measured signals.

The invention discloses a temperature compensation attenuator chip circuit which comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a switching tube, a diode group, an input port, an output port and a voltage control port. One end of the first resistor is connected with an input port of the circuit; one end of the second resistor is connected with an output port of the circuit; the other ends of the first resistor and the second resistor are connected together and then connected with the drain electrode of the switching tube; one end of the third resistor is connected with the source of the switching tube; the other end of the third resistor is grounded; one end of the fourth resistor is connected with the gate of the switching tube; the other end of the fourth resistor is connected with the positive electrode of the diode group and one end of a fifth resistor; the cathode of the diode group is connected with the voltage control port of the circuit; and the other end of the fifth resistor is grounded. The circuit has different attenuation values at different temperatures, high and low temperature gains of a channel can be compensated, and the problem of nonlinear distortion is avoided.