169results about "Frequency-independant attenuators" patented technology

The invention discloses an ultra-wideband 6-bit numerical control attenuator with low attenuation amplitude error and low phase change. The digital attenuator is composed of six attenuation units of 0.5 dB, 1 dB, 2 dB, 4 dB, 8 dB and 16 dB. The attenuation units are cascaded according to the attenuation amounts of 0.5 dB, 4dB, 16dB, 8dB, 2dB and 1dB, the attenuation units with the attenuation amounts of 0.5 dB and 1dB adopt a simplified T-shaped structure, the attenuation unit with the attenuation amount of 2dB adopts a bridge T-shaped structure, the attenuation unit with the attenuation amount of 4dB adopts a pi-shaped structure with bypass capacitance compensation, and the attenuation unit with the attenuation amount of 8dB adopts a pi-shaped structure with a bypass compensation capacitor and a branch communication compensation capacitor. And the attenuation unit with the attenuation amount of 16dB is formed by cascading two improved 8dB SPDT switch path type attenuation units. According to the invention, reverse compensation is carried out on phase lag caused by a low-pass filtering network formed by a reference state of a traditional attenuation structure or phase lead caused by a high-pass filtering network formed by an attenuation state, so that the phases of the two are close, and the phase difference between the reference state and the attenuation state is greatly reduced.

The embodiment of the utility model provides a numerical control attenuator with temperature compensation, which comprises at least one of an attenuator circuit, a first voltage generation circuit and a second voltage generation circuit, and is characterized in that the attenuator circuit comprises a first transistor, a resistance attenuation network and a second transistor; a first voltage generation circuit for generating a first control voltage having a first relationship with the temperature; a second voltage generation circuit for generating a second control voltage having a second relationship with the temperature; the first switch is used for outputting a first control voltage or a first turn-off voltage to a grid electrode of the first transistor; the second switch is used for outputting a second control voltage or a second turn-off voltage to the grid electrode of the second transistor. According to the embodiment of the invention, the insertion loss of the numerical control attenuator and the change of the attenuation amount along with the temperature can be improved, so that the numerical control attenuator can maintain stable performance at different temperatures.

Described herein are related to a device for communication. In one aspect, the device a first circuit configured to generate a signal. In one aspect, the device includes a port. In one aspect, the device includes a set of switches. Each switch of the set of switches may be coupled in parallel between the first circuit and the port. In one aspect, the device includes a second circuit configured to enable a subset of the set of switches, according to an amplitude of the signal.

The invention discloses a dynamic frequency adaptive automatic gain control system, which belongs to the field of dynamic frequency adjustment and comprises a radio frequency power amplifier, an attenuator, a logarithmic detector, a low-pass filter and a comparison and control signal generation module. The amplified radio frequency signal is input into the attenuator; the attenuator attenuates the signal so that the input radio frequency signal reaches a range suitable for detection of the logarithmic detector after attenuation; the logarithmic detector converts the radio-frequency signal into a direct-current voltage proportional to the signal power; voltage signals of direct-current voltage output by the logarithmic detector are smoothed through a low-pass filter, and rapidly changing components are removed; and the comparison and control signal generation module compares the smoothed voltage with a reference voltage, generates a control signal for adjusting the gain, and adjusts the gain. According to the invention, instant gain adjustment is provided under the condition of rapidly changing signals, and the energy efficiency of the system is improved.

An SIP module integrated direct wave amplifier comprises a power supply control module, an X-band down-conversion module and an L-band down-conversion module, the power supply control module provides attenuation control signals and a low-ripple power supply for the X-band down-conversion module and the L-band down-conversion module, the X-band down-conversion module performs primary frequency conversion on externally received radio frequency signals, and the L-band down-conversion module performs secondary frequency conversion on the externally received radio frequency signals. The L-band down-conversion module performs secondary frequency conversion on the radio frequency signal subjected to primary frequency conversion by the X-band down-conversion module, the two down-conversion modules are arranged to realize structure modularization and standardization by adopting a SiP modularization mode, and each module is independent in function, so that the structure is simple, the cost is low, and the cost is low. Meanwhile, the serial-parallel conversion chip control circuit is adopted to control the numerical control attenuator to meet the requirements for high gain and large dynamic range of the direct wave amplifier, the architecture and the number of control circuits are simplified, and the circuit is easy to build, easy to use, convenient to integrate and high in selection flexibility.

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.

The invention relates to the technical field of radio frequency microwave circuits, and discloses an ultra-wideband temperature compensation attenuator circuit which comprises a clamping circuit, a differential amplification circuit and an attenuation circuit. The clamping circuit adopts a clamping diode to suppress power supply voltage fluctuation so as to limit the amplitude range of the input voltage of the differential amplification circuit; the differential amplification circuit adopts a temperature compensation diode to generate temperature-related voltage, compares the temperature-related voltage with reference voltage, then performs differential amplification, and outputs temperature-related differential voltage; the attenuation circuit switches the working state according to the differential voltage related to the temperature so as to carry out linear adjustment and temperature compensation on the signal attenuation amount. Through the collaborative design of introducing the differential amplification circuit and the attenuation circuit, automatic adjustment can be carried out according to the change of the environment temperature, and the stable attenuation characteristic is maintained all the time.

The invention provides a silicon-based millimeter wave digital attenuator and a millimeter wave active phased-array antenna, and relates to the technical field of phased-array antennas. The attenuation function of the silicon-based millimeter wave digital attenuator is realized by switching two groups of identical A / B differential circuits of each core attenuation unit, that is, in the whole attenuation range, only one group of circuits of each working core attenuation unit are switched on, and the attenuator circuit formed by combining all the units can be switched on in the aspect of radio frequency small signals. The attenuator circuit is not changed in the aspects of a direct-current working circuit or a direct-current working circuit, that is, the change of radio frequency input and output impedance in the whole attenuation range is very small, the matching of the attenuator circuit and a front-stage circuit and a rear-stage circuit is easily maintained, meanwhile, the working current is basically kept unchanged, and the phase fluctuation is very small when the attenuator works.

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.

The invention relates to the technical field of sensor signal processing, in particular to a vibrating wire sensor anti-interference circuit and device, and the circuit comprises an interference suppression circuit, a differential amplification circuit, a clamping circuit, a low-pass filter circuit, a zero cross detection circuit and a processing module. The input end of the interference suppression circuit is used for being connected with a vibrating wire sensor, the output end of the interference suppression circuit is connected to the input end of the differential amplification circuit, the output end of the differential amplification circuit is connected to the input end of the clamping circuit, the output end of the clamping circuit is connected to the input end of the low-pass filtering circuit, and the output end of the low-pass filtering circuit is connected to the input end of the vibration wire sensor. The output end of the low-pass filter circuit is connected to the input end of the zero-cross detection circuit, and the output end of the zero-cross detection circuit is connected to the processing module. According to the invention, interference signals can be removed so as to obtain accurate signals to be detected.

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 utility model discloses a portable adjustable attenuator, comprising a power supply circuit used for providing working voltage for the adjustable attenuator; the dial switch is used for adjusting the attenuation precision unit of the adjustable attenuator so as to carry out signal attenuation on a circuit signal required to be attenuated; the signal input port is used for inputting a circuit signal before attenuation; the signal output port is used for outputting the attenuated circuit signal; the step attenuator is electrically connected with the power supply circuit, the dial switch, the signal input port and the signal output port, and the step attenuator is configured to perform adjustment based on the dial switch so as to attenuate a circuit signal transmitted by the signal input port; wherein the position of the adjustment precision of the step attenuator is 0.25 db. Through the design, the structure and the size of the attenuator can be simplified, the attenuator is convenient to carry, and the attenuation adjustment precision of the attenuator is more accurate.

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.

An attenuator arrangement comprising at least a first attenuation path configured to couple between a signal processing chain, SPC, and a measurement apparatus; said SPC comprising a first and second SPC terminal, said SPC configured to apply one or both of a gain and phase change on a signal passed between the SPC terminals; said measurement apparatus configured to measure one or both of the gain and the phase change applied by SPC by coupling to and receiving signals from said SPC terminals; wherein one of said first SPC terminal and said second SPC terminal is coupled to the measurement apparatus through said first attenuation path; and wherein the at least first attenuation path of the attenuator arrangement is configured to provide, selectively, for attenuation of the signal to the measurement apparatus to make the signal power of the signals from said SPC terminals more equal.

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 invention provides an analog automatic level control circuit with high power stability. The analog automatic level control circuit comprises a main link, a feedback loop with a constant-temperature island, a constant-temperature circuit and a high-stability DAC reference circuit, the main link comprises a voltage-controlled attenuator 1, a voltage-controlled attenuator 2, an amplifier and a coupler which are connected in sequence; the feedback loop with the constant-temperature island comprises a detection circuit and an RC comparison integral loop, the input of the detection circuit is connected with the other path of output of the coupler, the output of the detection circuit is connected with the input of the RC comparison integral loop, and the output of the RC comparison integral loop is connected with the voltage-controlled attenuator 1 and the voltage-controlled attenuator 2; the constant temperature circuit is arranged at the feedback loop and is used for acquiring the environment temperature of the feedback loop and heating according to the environment temperature so as to adjust the environment temperature; and the high-stability DAC reference circuit is connected with the RC comparison integral loop and is used for providing the reference voltage for the RC comparison integral loop. Through simple hardware circuit design, the problem that the output power of the ALC circuit fluctuates greatly along with high and low temperature conditions is solved.

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.