219results about "Phase shifting networks" 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.

There is provided a phase shifter circuit of an optical encoder. The phase shifter circuit receives a first signal, a second signal, a third signal and a fourth signal sequentially having a 90-degree phase shift, and includes a first cascaded resistor string, a second cascaded resistor string, a third cascaded resistor string and a fourth cascaded resistor string. The first, second, third and fourth cascaded resistor strings respectively delay the first, third, second and fourth signals by selecting a switch connected at a tap-out node of the first, second, third and fourth cascaded resistor strings to correct phase deviations between incremental signals and an index signal and / or between incremental signals.

The invention discloses a broadband low-power-consumption receiving and transmitting shared phase shifter which comprises a differential signal common port, a frequency sampling and control circuit, a dual-mode orthogonal generation circuit and a passive vector modulation synthesis circuit. The differential signal common port comprises a common input / output port interface of RF + and RF-differential radio frequency signals; the frequency sampling and control circuit is composed of a frequency sampling circuit, a frequency detection circuit and a logic control unit. The dual-mode orthogonal generation circuit is composed of a frequency selection change-over switch, a multi-phase filter, a coupling transformer, a matching network 1 and a matching network 2. The passive vector modulation synthesis circuit is composed of two passive vector modulation arrays and two combining / power dividing circuits.

The invention discloses an ultra-wideband 180-degree phase shift circuit which comprises a radio frequency signal input end, a radio frequency signal output end, an ultra-wideband balun with a center tap and a stub compensation line, a first matching compensation network, a second matching compensation network, a differential signal switch selection circuit and a control circuit. The ultra-wideband balun can realize conversion between a single-ended signal and a differential signal in an ultra-wideband frequency range, a first differential output port of the ultra-wideband balun is connected with one end of the first compensation matching network, and a second differential output port of the ultra-wideband balun is connected with one end of the second compensation matching network; a first differential port of the differential signal switch selection circuit is connected with the other end of the first compensation matching network, and a second differential port of the differential signal switch selection circuit is connected with the other end of the second compensation matching network; and the control circuit is used for controlling the differential signal switch selection circuit to switch and output 0-degree and 180-degree radio frequency signals. According to the invention, low-error phase shift precision can be provided within the frequency range of 2-20GHz and the relative bandwidth of 160%.

The present application relates to the technical field of communications, and in particular to a switch-based compact phase shifter and an integrated phase shifter, which solve the problems of excessive size and costs of existing phase shifters. The switch-based compact phase shifter comprises: a first filter network, the first filter network being an Nth order high-pass filter network; a second filter network, the second filter network being an Mth order low-pass filter network; and a third filter network, the third filter network being an Rth order low-pass filter network; wherein: the first filter network, the second filter network, and the third filter network are connected in parallel by means of a double-pole three-throw switch; and when the second filter network is turned on alone, the insertion phase of the switch-based compact phase shifter is a reference phase; when the third filter network is turned on alone, the insertion phase of the switch-based compact phase shifter is a first phase; when only the first filter network and the second filter network are turned on, the insertion phase of the switch-based compact phase shifter is a second phase; and when only the first filter network and the third filter network are turned on, the insertion phase of the switch-based compact phase shifter is a third phase.

The invention discloses an impedance-invariant vector synthesis phase shifter, an array element and a phased array, and relates to the technical field of phased array design. According to the impedance-invariant vector synthesis phase shifter provided by the invention, two capacitive compensation branches are arranged in each Gilbert unit of a variable gain amplifier, and the capacitive compensation branches are connected to a circuit only when bits are turned off, so that the output impedance of the unit is kept unchanged when the bits are turned on and turned off, and the output impedance of the unit is not changed when the bits are turned off. The phase shifting precision of the phase shifter is effectively improved, the root mean square phase error of the phase shifter is reduced to be within the acceptable range of the engineering field, phase shifting is directly carried out according to the most ideal condition based on IQ orthogonal signals, complicated calibration work is avoided, and the calibration problem of the vector synthesis phase shifter is solved. The invention further provides an array element which adopts the impedance-invariant vector synthesis phase shifter, the continuous time linear equalizer and the current mode attenuator and has the advantage of being convenient to deploy.

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 invention discloses a broadband digital phase shifter based on an inductor sharing topology and an equivalent band-pass network, relates to the technical field of microwave integrated circuits, and is suitable for being applied to a Sub-GHz frequency band. The phase shifter comprises a phase shift circuit module and a driving circuit module, and the phase shift circuit module comprises six basic phase shift units including a fine phase shift unit and a coarse phase shift unit which cooperatively realize full-range multi-state phase shift. The fine phase shift unit adopts an inductor sharing topology, so that a phase shift path and a reference path share a circuit architecture, the design is simplified, and the chip layout is optimized; the coarse tuning phase shifting unit adopts an all-pass network as a reference path, a phase shifting path is an equivalent band-pass network formed by cascading a high-pass network and a low-pass network, and the 180-degree phase shifter adopts a double-inductor all-pass network to optimize amplitude-frequency response. And the driving circuit module outputs complementary voltage pairs through the level conversion circuit to drive the switching transistor to realize path switching. The antenna has the advantages of being compact in structure, stable in amplitude, excellent in radio frequency performance and high in adaptability.

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 provides a gain-reconfigurable active phase shifter with a low phase error, and relates to the technical field of phase shifters, and the phase shifter comprises a quadrature coupler which converts a radio frequency input signal into a shunt radio frequency signal; the input matching Balun converts the shunt radio frequency signal into a shunt differential signal; the digital control signal received by the phase inversion variable gain amplifier is used for controlling the on-off state of a differential pair in each differential group, and determining a differential combination current corresponding to a differential pair combination in a conduction state based on a shunt differential signal corresponding to each differential pair; the differential combination current is used for representing a gain state corresponding to the differential pair combination; the input impedance and the output impedance of the phase inversion variable gain amplifier in different gain states are kept unchanged; the vector synthesis module determines a phase shift differential signal based on the differential combined current; the output matching Balun converts the phase shift differential signal into a radio frequency output signal. The antenna has a wide gain adjustable range and a low phase error.

Wireless communication circuitry may include active phase shifter circuitry. The active phase shifter circuitry may include a quadrature hybrid coupler and amplifiers coupled to the outputs of the quadrature hybrid coupler. An additional quadrature hybrid coupler may be coupled to the amplifiers.

In some embodiments, the phase adjustment circuit includes a clock generator that is configured to generate a sinusoidal clock signal, and may include a variable amplifier that is configured to receive the clock signal output from the clock generator as an input, output an amplitude-adjusted sinusoidal differential clock signal, and output an amplitude-adjusted in-phase signal. The phase adjustment circuit may include an adder that is configured to output a differential signal obtained by adding the in-phase signal to each of a positive phase side and a negative phase side of the differential clock signal output from the variable amplifier, a differential transmission line that includes two transmission lines configured to transmit the differential signal output from the adder, and a terminal circuit that is configured to terminate the differential transmission line where a signal is output from a terminal of any one of the two transmission lines.

A phase shifter including: an upconversion mixer configured to receive a local oscillator (LO) signal having a LO frequency, and configured to receive and multiply a radio frequency (RF) input signal with the LO signal to produce a modulated signal having two sidebands around the LO frequency, an intermediate IF sideband having frequency below the LO and an image sideband; a filter connected to and configured to receive the modulated signal from the upconversion mixer and to attenuate a range of frequencies corresponding to the image sideband to select and output the intermediate frequency (IF) sideband signal; and a downconversion mixer configured to receive and multiply the IF sideband signal with a phase shifted LO signal to produce an output signal including a phase shifted version of the RF input signal.

Certain aspects of the present disclosure generally relate to electronic circuits, and more particularly, to wireless transmitters. One example apparatus generally includes: an in-phase direct-current (DC) level shifter; a quadrature DC level shifter; an in-phase voltage-to-current (V2I) converter having an input coupled to an output of the in-phase DC level shifter; a quadrature V2I converter having an input coupled to an output of the quadrature V2I converter; a bias control circuit having inputs coupled to the in-phase V2I converter and the quadrature V2I converter, an output of the bias control circuit being coupled to at least one of the in-phase DC level shifter or the quadrature DC level shifter; an in-phase mixer having an input coupled to an output of the in-phase V2I converter; and a quadrature mixer having an input coupled to an output of the quadrature V2I converter.

A millimeter wave (mmW) communication system located on a millimeter wave integrated circuit (MMW-IC) includes a phase shifter selectively connected to a receive path by a first electromagnetic (EM) element and selectively connected to a transmit path by a second EM element, the first EM element configured to receive a transmit signal and configured to receive a receive signal from a low noise amplifier (LNA), the second EM element configured to receive a phase shifted transmit signal or a phase shifted receive signal from the phase shifter, and wherein the second EM element is configured to selectively provide the phase shifted transmit signal to a power amplifier on the mmW-IC and the phase shifted receive signal to receive signal processing circuitry located off of the mmW-IC.

The invention relates to the field of semiconductor integrated circuit design, in particular to a low-noise low-power-consumption active vector synthesis phase shifter based on a CMOS (Complementary Metal Oxide Semiconductor) process, which comprises a single-ended to differential circuit, a first orthogonal network, a second orthogonal network and a vector modulation circuit, the first end of the single-ended to differential circuit serves as an input end, and the second end and the third end of the single-ended to differential circuit are connected with the first end of the first orthogonal network and the first end of the second orthogonal network respectively. The second end and the third end of the first orthogonal network are respectively connected with the first end and the third end of the vector modulation circuit; the second end and the third end of the second orthogonal network are respectively connected with the second end and the fourth end of the vector modulation circuit; the fifth end of the vector modulation circuit serves as an output end; the noise coefficient of the phase shifter is reduced, and the power consumption of the phase shifter is reduced.

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.

An in-phase / quadrature (l / Q) clock generator (400) is described. The l / Q clock generated includes a poly-phase filter (420) configured to generate a four-phase quadrature clock signal (422) in response to a two-phase quadrature clock signal (406) generated in response to a single-ended input clock signal (402). The l / Q clock generated also includes a phase interpolator (460) configured to generate an output four-phase quadrature clock signal (462) from the four-phase quadrature clock signal. The l / Q clock generated further includes a poly-phase filter tune circuit (430) coupled to an output of the phase interpolator (460). The poly-phase filter tune circuit (430) is configured to generate a control voltage (432) for the poly-phase filter to tune the four-phase quadrature clock signal from the poly-phase filter.

The invention provides a W-band sixteen-channel chip circuit model, and relates to the technical field of radio frequency integrated microsystems. The model comprises an up-conversion frequency mixing circuit, a down-conversion frequency mixing circuit and sixteen channel circuits connected in parallel, and each channel circuit comprises two branch circuits connected in parallel. Wherein one branch is sequentially connected in series with a low-noise amplification circuit, a first six-bit numerical control phase shift circuit, a first driving amplification circuit, a five-bit numerical control attenuation circuit and a second driving amplification circuit, and the other branch is sequentially connected in series with a first power amplification circuit, a second six-bit numerical control phase shift circuit and a second power amplification circuit. The sixteen channel circuits are all connected to an input port of the radio frequency switch circuit S. The up-conversion frequency mixing circuit and the down-conversion frequency mixing circuit are respectively connected with two output ends of the radio frequency switch circuit S. According to the method, the design speed of a complex circuit or system can be increased, and a priori condition is provided for research of a large-scale complex network.

This invention belongs to the field of microwave communication, specifically disclosing a low-parasitic amplitude modulation differential bridge T-type phase shifter. The ground terminals of the differential positive branch phase shifter circuit and the differential negative branch phase shifter circuit are connected to form a differential virtual ground. A first input port is connected to the input terminal of the differential positive branch phase shifter circuit via a matching circuit, and a second input port is connected to the input terminal of the differential negative branch phase shifter circuit via a matching circuit. The output terminal of the differential positive branch phase shifter circuit is connected to the first output port, and the output terminal of the differential negative branch phase shifter circuit is connected to the second output port. A first insertion loss adjustment circuit is connected in parallel between the matching circuit and the phase shifter circuit, and a second insertion loss adjustment circuit is connected in parallel between the phase shifter circuit and the signal output port. This invention reduces the difference in insertion loss between the bridge T-type phase shifter in the reference state and the phase shifter state, thus reducing parasitic amplitude modulation. This invention is applicable to phase control in phased array radar antenna elements.

The application provides a vector synthesis structure of a phase shifter, comprising: a first vector synthesis branch and a second vector synthesis branch; wherein the first vector synthesis branch comprises: a first tail current source, a first DAC bias circuit and a first gate width control circuit, the first tail current source comprises a plurality of first tail current units with gradually increasing width-length ratios, and the first DAC bias circuit is provided with a plurality of first current mirror bias units in correspondence; the second vector synthesis branch comprises: a second tail current source, a second DAC bias circuit and a second gate width control circuit, the second tail current source comprises a plurality of second tail current units with gradually increasing width-length ratios, and the second DAC bias circuit is provided with a plurality of second current mirror bias units in correspondence; the application can improve the linearity of the active phase shifter while ensuring the phase shift precision.

This phase shifter comprises: a high-frequency transmission path I connected between a first output terminal (1b) of an input-side selector switch (1) and a first input terminal (2b) of an output-side selector switch (2); and a low-frequency transmission path II connected between a second output terminal (1c) of the input-side selector switch (1) and a second input terminal (2c) of the output-side selector switch (2).　The high-frequency transmission path I has a high-pass filter (10) and an all-band pass circuit (11) connected in series, and the low-frequency transmission path II has a composite right / left-handed transmission line (20) and an all-band pass circuit (21) connected in series.

The present invention discloses an active phase shifter with temperature compensation, comprising an input transformer balun, a polyphase filter, a vector modulation module based on a Gilbert cell, an output transformer balun, and a positive temperature coefficient current source. The input transformer balun is used to convert a single-ended input signal into a differential signal; the polyphase filter is used to convert the differential signal into a quadrature signal; the vector modulation module based on the Gilbert cell is used to select polarity and perform vector synthesis on the quadrature signal; the output transformer balun is used to convert the differential signal at the output into a single-ended signal; and the positive temperature coefficient current source is used to control the gain of the Gilbert cell. By designing a temperature-dependent positive temperature coefficient current source, the present invention mitigates the temperature-dependent gain change of the vector modulation module, thereby improving the stability of the key performance of the active phase shifter within a temperature range of 55 to 85°C.

The invention discloses a local oscillator circuit applied to a radio frequency front end. The local oscillator circuit comprises a phase-locked loop, a phase shifter and a differential converter, the phase-locked loop is connected with the phase shifter, and the phase-locked loop is used for synthesizing an oscillation signal according to an external reference signal and transmitting the oscillation signal to the phase shifter; the phase shifter is connected with the differential converter, and the phase shifter is used for converting an oscillation signal into an orthogonal local oscillation signal and transmitting the orthogonal local oscillation signal to the differential converter; the differential converter is used for converting the orthogonal local oscillator signal into an orthogonal differential local oscillator signal. The phase-locked loop solves the technical problem that an existing phase-locked loop outputs a single-phase signal and cannot directly meet the orthogonal frequency mixing requirement.

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.

This invention discloses a vector modulation active phase shifter, comprising a coupling network (100) for generating quadrature signals, a first active amplitude control module (200) and a second active amplitude control module (300) composed of a common-source cascode transistor array for adjusting the gain of in-phase and quadrature signals, and a power combining and output matching network (400). The vector modulation active phase shifter includes a phase compensation network (500) located between the coupling network for generating quadrature signals and the active amplitude control module, used to optimize the phase bandwidth of the quadrature signals and improve phase shift accuracy. This invention realizes a wideband, high-precision, directly digitally controlled vector combining active phase shifter with a 360° phase shift range.

The invention provides a compensation capacitor-based T-type phase shift unit and a 6-bit radio frequency phase shifter chip. The compensation capacitor-based T-type phase shift unit comprises a basic T-type phase shift unit and a first compensation capacitor, according to the basic T-type phase shift unit, one end of an inductor serves as an input end to be connected with a drain electrode of a first switch, and the other first inductor serves as an output end to be connected with a source electrode of the first switch; the gate of the first switch is connected with control voltage; the other ends of the two first inductors are connected as a common end; the grid electrode of the second switch is connected with the control voltage and the drain electrode is connected with the common end; a reverse control voltage is connected to the grid electrode of the second switch; source electrodes of the second switch and the third switch are grounded; the third switch, the second inductor and the second compensation capacitor are connected in parallel; and a second switch in the basic T-shaped phase shift unit is connected with the first compensation capacitor in parallel, so that the first compensation capacitor and the second compensation capacitor form a parallel compensation structure. The T-shaped phase shifting unit can effectively solve the problems that an existing T-shaped phase shifting unit is large in area and poor in-band matching performance.

The invention provides a phase shift wave trap control algorithm for suppressing vibration of a magnetic suspension rotor, and the algorithm comprises the steps: carrying out the sine wave excitation and frequency scanning in a specific frequency band around a target frequency of a phase shift wave trap, and calculating the sensitivity function gain under different phase angle conditions; and finally, sensitivity function gain values under different phase angle conditions are judged, the optimal phase angle of the phase shift wave trap under the target frequency condition is obtained, and the function of ensuring stable operation of the magnetic suspension rotor system within the full frequency band range is achieved. The method is simple, the calculated amount is small, and the phase angles at different rotating speeds can be quickly and accurately found out, so that the high responsiveness and stability of the magnetic suspension rotor system are ensured. According to the method, simulation data is not needed, and automatic calibration and searching can be carried out when the centrifugal compressor runs; the phase-shift wave trap is applied to the fields of magnetic levitation centrifugal compressors, magnetic levitation flywheels and the like, is not only suitable for single phase-shift wave traps, but also suitable for occasions using a plurality of phase-shift wave traps, and is wide in application range and high in applicability.

A phase shifter has: an input matching network; a vector modulator connected to the input matching network, the vector modulator configured to alter an amplitude of a signal provided by the input matching network; a bias network coupled to an output of the vector modulator; and a combining circuit connected to the outputs of the vector modulator, the combining circuit configured to generate a first phase ([theta] 1) signal from the outputs of the vector modulator.