130results about "Frequency-independant attenuators" patented technology

The invention discloses a terahertz phase shifter chip based on a magnetic coupling line fine adjustment technology, the magnetic coupling line fine adjustment technology is applied to a magnetic coupling line distributed attenuator, and a magnetic coupling line is added below a transmission line of the magnetic coupling line distributed attenuator. And a switching transistor array and a capacitive compensation transistor are respectively added at two ends of the magnetic coupling line. A vector synthesis type structure is adopted, the magnetic coupling line fine adjustment technology is innovatively provided and applied to the magnetic coupling line distributed attenuator, compared with a traditional distributed attenuator, the magnetic coupling line distributed attenuator has the advantages of being higher in precision and smaller in attenuation stepping, the occupied area is the same, the phase shifting control function of the phase shifter is achieved based on the attenuator, and the application range is wide. Finally, the phase of an output signal is controlled to realize a phase control function of 5.625-degree phase shift stepping in a full 360-degree range, and an amplitude control function in a 3dB range can be realized.

A phase shifter (100) with controllable attenuation and a method for controlling the phase shifter is disclosed, the phase shifter (100) comprising a plurality of transmission line segments (120, 220) coupled in series, wherein each said transmission line segment (120, 220) comprises an attenuation circuit (130, 230), selectively couplable between a signal line (126, 222) of the transmission line segment (120, 220) and ground to selectively attenuate a signal propagating through the transmission line segment (120, 220). Each transmission line segment (120, 220) is switchable between a first configuration providing a first phase shift for a signal propagating through the transmission line segment (120, 220) and a second configuration providing a second phase shift, greater than said first phase shift, for a signal propagating through the transmission line segment (120, 220).

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.

The invention discloses a power supply self-adaptive active temperature compensation attenuator which comprises a radio frequency attenuation circuit, a positive voltage temperature compensation driving circuit and a power supply self-adaptive adjusting circuit. The radio frequency attenuation circuit is connected in series in a signal link and comprises a transistor and a resistor; the positive voltage temperature compensation driving circuit comprises a transistor, a diode and a resistor. The driving transistor outputs a voltage playing a temperature compensation role by utilizing the temperature change of the electrical characteristic of the diode, and outputs the voltage to the radio frequency attenuation circuit in a voltage division manner; the power supply self-adaptive adjusting circuit comprises a resistor and a diode, the resistor and the diode adjust the grid voltage of a transistor in the driving circuit when the power supply fluctuates, the output voltage of the whole driving circuit is adjusted, and the influence of power supply fluctuation on the driving circuit is counteracted. Positive voltage is used for working, the structure is novel, the chip size is small, the temperature compensation characteristic is good, and the application range is wide; and the power supply interference resistance is good.

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 numerical control attenuator and a numerical control attenuation system. The numerical control attenuator comprises a series attenuation module connected between the input end and the output end of the numerical control attenuator and at least one bypass attenuation module connected with the series attenuation module. The first end of the bypass attenuation resistor in each bypass attenuation module is connected with the series attenuation module; the first end of the bypass switch module is connected with the second end of the bypass attenuation resistor, and the second end of the bypass switch module is grounded; the first end of the compensation switch module is connected with the first end of the bypass attenuation resistor, and the second end is connected with the second end of the bypass attenuation resistor; according to the circuit, the two ends of the bypass attenuation resistor are connected with the compensation switch module in parallel, and a compensation switch tube in the compensation switch module is the same as a bypass switch tube in the bypass switch module, so that the phase shift fluctuation direction can be ensured to be consistent when the numerical control attenuator is in a reference state and an attenuation state under the condition of extreme temperature or process; therefore, the additional phase shift of the numerical control attenuator can be reduced.

The application relates to radio frequency technology and particularly provides an input overvoltage protection circuit of a radio frequency ADC, which comprises an ADC acquisition unit; a switching unit is used for selectively making a voltage signal enter a first channel or a second channel, wherein an attenuation circuit is arranged in the second channel; the output ends of the first channel and the second channel are sequentially connected with a first radio frequency operational amplifier and the ADC acquisition unit, the first radio frequency operational amplifier completes single-end to differential conversion; and an identification circuit is connected with the output ends of the first channel and the second channel, and when it is identified that the voltage of the first channel exceeds a set value, the voltage signal selects the second channel. The application has the advantages of good protection effect and the like and can be applied in a mass spectrometer.

The invention discloses a phase-shift attenuator control method and a phase-shift attenuator, and relates to the field of signal processing, and the method comprises the steps: traversing all code blocks, and obtaining amplitude change information and phase change information outputted by a group of phase-shift attenuators corresponding to each code block; selecting a reference point, and constructing a plurality of ideal target points based on the reference point and the attenuation step and the phase shift step of the phase shift attenuator; taking the code block corresponding to the nearest group of change information as the code block corresponding to the ideal target point; and controlling the switch array based on the reference point corresponding to the phase shift attenuation request or the code block corresponding to the ideal target point according to the received phase shift attenuation request. And all code blocks are traversed, so that the phase-shifting attenuator can meet various phase-shifting attenuation requests. Phase shifting and attenuation are used as the same device, and phase shifting and attenuation are carried out at the same time and do not influence each other. When a phase shift attenuation request is received, a proper and accurate code block can be selected from all code blocks to perform phase shift and attenuation on a signal.

A computing cable comprising a trace having a first impedance and an attenuator that includes a fixed resistor having a second resistance, a variable resistor having a first resistance, and a conductor having a second impedance. The combination of the first resistance, the second resistance, and the second impedance is based on the first impedance, wherein the first resistance is varied dynamically at runtime based on a control input.

The application provides a controllable attenuator based on a complementary open resonant ring structure, which is composed of a cascaded active gain compensation amplifier and an open resonant low-pass filter. The open resonant low-pass filter comprises a microstrip low-pass filter, a complementary open resonant ring, a variable capacitor and a control circuit. The microstrip low-pass filter is composed of a middle dielectric layer and a first metal surface and a second metal surface located on both sides of the dielectric layer. The complementary open resonant ring is designed on the second metal surface. The variable capacitor is connected in parallel between the inner metal surface and the outer metal surface of the complementary open resonant ring. The capacitance of the variable capacitor is adjusted through the control circuit, so as to control the attenuation amplitude of the controllable attenuator based on the complementary open resonant ring structure. The controllable attenuator based on the complementary open resonant ring structure has a very small volume and can be integrated into a chip.

The invention discloses a high-precision multi-band power amplifier gain amplitude-phase calibration device and method based on FPGA control, and the device comprises a numerical control attenuator, a plurality of different segmented phase shifters, a radio frequency multi-way switch, a digital temperature sensing unit, an air cooling system, a power circuit, an FPGA chip, and an upper computer. The numerical control attenuator, the radio frequency multi-way switch and the sectional type phase shifter form a radio frequency calibration link, the numerical control attenuator, the sectional type phase shifter, the radio frequency multi-way switch, the digital temperature sensing unit and the air cooling system are respectively in signal connection with a control output port of the FPGA chip, and the FPGA chip is connected with an upper computer through an RS232 serial port communication circuit. The power supply circuit provides power supply requirements for all the modules, the calibrated power amplifier is connected with the output end of the sectional phase shifter, and the digital temperature sensing unit is attached to the packaging surface of the calibrated power amplifier. According to the invention, the amplitude and phase fluctuation of the power amplifier can be finely controlled within a required range while the signal integrity is ensured, and the problems of low calibration efficiency, low calibration precision and high calibration cost of a traditional calibration device are solved.

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 utility model discloses a high-isolation multi-path programmable attenuator, which comprises a printed circuit board, the printed circuit board is provided with a plurality of attenuation units, and each attenuation unit comprises an input port connector, an output port connector, a programmable attenuation circuit and a metal shielding cover. The input port connector and the output port connector are oppositely arranged at the two ends of the printed circuit board, the programmable attenuation circuit is electrically connected with the input port connector and the output port connector respectively, and the metal shielding cover covers the attenuation unit. According to the utility model, through the metal shielding cover covering the attenuation unit, the isolation space between every two attenuation channels is ensured, so that the situation of insufficient attenuation proportion caused by insufficient isolation is avoided, and meanwhile, the input port and the output port are both positioned in the metal shielding cover, so that the reliability of the attenuator is ensured.

The invention discloses a numerical control current mode attenuator and a module and a chip thereof. The numerical control current mode attenuator adopts a mode of cascading a plurality of attenuation units to realize high-attenuation-range and multi-bit attenuation of differential signals, and each attenuation unit comprises a phase inverter and two switch embedded circuits which are symmetrically arranged; and each switch embedded circuit comprises NMOS (N-channel metal oxide semiconductor) transistors M1 and M2 and resistors R1 and R2. A control signal controls the gate of M1 and also controls the gate of M2 via an inverter. Two ends of the R2 are respectively connected with the drain electrode and the source electrode of the M2. Drain electrodes of the M1 and the M2 are both connected with a pair of input differential signals, and a source electrode of the M2 outputs a pair of output differential signals through a source electrode of the M1 of the R1. A passive device network is adopted, low power consumption is achieved, corresponding matching circuit design is not needed, an inductor is not needed, and the technical problems that a traditional numerical control current mode attenuator is high in power consumption, and a large area of a chip is occupied when the chip is manufactured are solved.

An attenuator circuit for testing electronic devices includes a first circuit having a first input, a first output, a first resistor coupled between the first input and the first output, and a second resistor coupled between the first output and a reference node, a second circuit having a second input, a second output, and a first amplifier circuit, the second input coupled to the first output, and the first amplifier circuit coupled between the second input and the second output, and a third circuit having a third input, a third output, a second amplifier circuit, and a gain control circuit, the third input coupled to the second output, the second amplifier circuit coupled between the third input and the third output, and the gain control circuit configured to adjust a gain of the second amplifier circuit.

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 relates to a manually-adjusted high-power broadband attenuation control device and method. A first adjusting unit provides discrete gears corresponding to different first attenuation values, and a second adjusting unit provides discrete gears corresponding to different second attenuation values. The processing module determines an attenuation value according to input information of the first adjusting unit and the second adjusting unit, calculates a target attenuation value, converts the target attenuation value into a 6-bit parallel binary control code, and outputs the 6-bit parallel binary control code to the program control attenuation module through a parallel interface. And each bit of the control code corresponds to a weighted attenuation bit, so that independent start and stop of the attenuation unit are realized. The method comprises the steps of detecting a pin level, determining an attenuation value, calculating a target value, generating a control code and outputting an instruction. And when the target attenuation value exceeds 63dB, forcibly outputting a maximum attenuation instruction. According to the scheme, the operation process is simplified through a two-stage adjustment framework, the response speed is improved through parallel direct drive control, the full-band signal attenuation stability is guaranteed through the metal shielding shell integrated design, and the high-power test device is suitable for a high-power test scene of the frequency band of 0.5-40 GHz.

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 discloses a broadband attenuator with high precision and low additional phase shift, and belongs to the field of radio frequency microwaves. Comprising a reference path, an attenuation path, a state change-over switch group and a compensation circuit. The reference path is composed of a microstrip line; an attenuation path uses a pi-type attenuation network to obtain larger attenuation; the state change-over switch group consists of four pairs of symmetrical switch FETs and is used for switching between an attenuation path and a reference path; the compensation circuit modifies a series branch and a parallel branch of the pi-type attenuation network into RLC circuits by connecting the R1 with a capacitor C1 and an inductor L1 in series and connecting the R2 with a capacitor C2 and an inductor L2 in series, and is used for achieving phase and amplitude compensation of the attenuator. According to the broadband large-attenuation attenuator with high precision and low additional phase shift provided by the invention, high precision and low additional phase shift of the attenuator on a broadband can be realized.

The utility model relates to the technical field of wireless communication, in particular to a small-sized low-phase-noise frequency source module, which comprises a box body and a circuit sub-module arranged on the box body. The circuit sub-module comprises a signal input unit, a broadband reference output unit, a local oscillator signal conversion unit, an intermediate frequency signal conversion unit, a frequency mixer, a first amplifier, a first filter, a first attenuator ATT-3db, a frequency divider, a second filter, a second amplifier, a first coupler, a second attenuator ATT-3db, a first power divider and two third attenuators ATT-3db; two third amplifiers, two third filters and two second couplers; in this way, the technical problems that a frequency source module used in the prior art is poor in phase noise, large in size and large in stray are solved.

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 utility model relates to a frequency multiplier module with phase noise deterioration value calibration, which comprises a first attenuator, a first filter, a second attenuator, a second filter and an intermediate driving module, and is characterized in that the signal input end of the frequency multiplier module is electrically connected with the first attenuator and the first filter; the output end of the first attenuator is electrically connected with the input end of the first filter; the output end of the frequency multiplier module is electrically connected with a second attenuator and a second filter, and the output end of the second attenuator is electrically connected with the input end of the second filter; and at least two groups of intermediate driving modules are electrically connected between the first filter and the second attenuator. According to the utility model, after calibration parameters are obtained by measuring each calibration channel and a finally output phase noise deterioration value, the frequency multiplier module can be applied to a scene without a high-precision measuring instrument, the frequency can reach the ground noise which can be measured by a common frequency spectrograph, and the accuracy of the frequency multiplier module after compensation and calibration also reaches a relatively high level.

An impedance conversion circuit and an oscilloscope front-end circuit, relating to the technical fields of electrical measurement and electronic measurement. The impedance conversion circuit comprises an alternating current coupling module, a voltage and current conversion module, a series current and voltage conversion module, a parallel current and voltage conversion module, an amplifier module, and an integrator module. The voltage and current conversion module acquires a high-frequency voltage signal and a voltage adjustment signal to generate a first current signal; the series current and voltage conversion module is connected to the voltage and current conversion module to transmit the first current signal and convert the first current signal into a first voltage signal; and the parallel current and voltage conversion module is connected to the series current and voltage conversion module so as to generate an output voltage signal and a reference voltage. The integrator module is connected to the amplifier module, the series current and voltage conversion module, and the parallel current and voltage conversion module so as to generate a voltage adjustment signal and input the voltage adjustment signal into the voltage and current conversion module. In this way, provided are an impedance conversion circuit and an oscilloscope front-end circuit each of which the high-frequency output impedance and the low-frequency output impedance are the same.

The utility model discloses a switch type attenuator with adjustable phase and precision. The switch type attenuator comprises a first phase adjusting module, a first precision adjusting module, a main attenuation module, a second precision adjusting module and a second phase adjusting module which are sequentially connected in series on a main circuit, the switch input end of the main attenuation module is connected with a first control switch voltage; each of the first phase adjusting module and the second phase adjusting module comprises a basic phase adjusting unit and at least one compensation phase adjusting unit which are connected in sequence; each of the first precision adjusting module and the second precision adjusting module comprises a third transistor and a fourth transistor. According to the utility model, the simple switch type attenuation circuit is used to realize attenuation precision compensation under different temperature conditions, no extra insertion loss is introduced, the low insertion loss performance of the switch type attenuator is ensured, the switch type phase adjusting module is used, the high-frequency phase is optimized, and the performance of the attenuator is improved. And meanwhile, the robustness of the switch type attenuator in the ultra wide band 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 module has two portions, each portion has two units provides an analog-type attenuator-tuning approach having digital control. Each of the units includes an input, an output, three selectable conductive paths, and an input switching element for selectably connecting the unit input to the unit output via one of the three selectable conductive paths. The first and second paths have attenuation elements. The unit output of the first unit of each portion is connected to the unit input of the second unit thereof and the unit output of the via one of the three selectable conductive paths, the unit output of the first unit of each portion is connected to the unit input of the second unit thereof, and the unit output of the second unit of the first portion is connected to the unit input of the first unit of the second portion.

The present invention relates to the technical field of attenuators, and discloses a temperature-compensated attenuator circuit, a radio frequency device, and a temperature-compensated attenuation method. The temperature-compensated attenuator circuit includes a control voltage generating circuit and an attenuation circuit; the control voltage generating circuit is connected to the attenuation circuit, and the attenuation circuit is used to access the output signal of a target device; the control voltage generating circuit is used to generate a first control signal and a second control signal that varies with the first control signal based on the temperature of the target device, and transmit the first control signal and the second control signal to the attenuation circuit; the attenuation circuit is used to attenuate the output signal of the target device based on the first control signal and the second control signal, and output the attenuated signal; wherein the first control signal is used to control the attenuation amount of the attenuation circuit, and the second control signal is used to maintain the impedance stability between the output signal of the target device and the attenuated signal. The temperature-compensated attenuator circuit provided by the present invention effectively solves the problem of unstable impedance matching of existing temperature-compensated attenuation circuits.