43 results about "Quadrature error" patented technology

The invention relates to the technical field of calibration test, and particularly discloses a strapdown inertial navigation automatic calibration test method of a temperature control biaxial rate position turntable. Comprising the following steps: S1, multi-dimensional error modeling and layered calibration architecture: constructing a comprehensive error model containing a sensor scale factor error, an installation non-orthogonal error, a zero offset error, a cross axis coupling error and a temperature related error; s2, a wide temperature range self-adaptive compensation mechanism: carrying out heat preservation at a preset temperature point and executing turntable positioning and rate movement; s3, performing automatic data processing and parameter estimation; and S4, performing real-time error correction and dynamic verification: performing real-time error correction based on the estimated parameters, and evaluating navigation performance indexes such as position, speed and attitude precision. Through technical innovation, high-precision, automatic and wide-temperature-range calibration of the strapdown inertial navigation system is realized, and the method is suitable for aerospace, intelligent equipment and other scenes with strict navigation precision requirements, and has remarkable engineering application value and market competitiveness.

The present invention relates to the field of inclinometer trajectory measurement, and more particularly to a calibration and correction method for a gyro inclinometer and a gyro inclinometer. The method includes establishing a gyro inclinometer zero bias calibration model to calculate the sensor output value after eliminating the zero bias; establishing a gyro inclinometer scale calibration model to calculate the sensor output value after eliminating the sensitivity error; establishing a gyro inclinometer orthogonal model to perform orthogonal error compensation; establishing a gyro inclinometer non-coaxial model to perform sensor attitude calibration; establishing a comprehensive calibration and correction model based on the above models; and based on the comprehensive calibration and correction model, sequentially assuming the attitudes required for gyro inclinometer calibration according to a calibration and correction algorithm, obtaining sensor values ​​under multiple attitudes, calculating calibration and compensation parameters, and performing calibration and correction of the gyro inclinometer. The present invention has the effect of reducing gyro inclinometer measurement errors.

The present disclosure provides a method and a system to estimate LO leakage and quadrature error parameters for a transmitter RF front end, such as a direct up-conversion transmitter RF front end, in a joint fashion. The proposed method utilizes a PN sequence inserted at the transmitter baseband. At the observation receiver side, an RX accumulator is implemented to sum receiver signals to take advantage of a despreading gain using the same PN sequence from transmitter side. Through the despreading process, the receiver-transmitter channel may be estimated and used to extract the quadrature error parameters. The estimated channel may also be used to eliminate user data interference presented within the RX accumulator output, which may further be used to compute the LO leakage.

Embodiments of the present disclosure provide a fully decoupled three-axis MEMS gyroscope and an electronic product. The gyroscope comprises: a substrate, and an X / Y proof mass, Z proof masses, driving structures and Z decoupling masses that are fixed on the substrate; the X / Y proof mass is arranged around outer sides of the Z proof masses, the driving structures and the Z decoupling masses; the Z proof masses are oppositely arranged in an x-axis direction; the driving structures are oppositely arranged at outer sides of the Z proof masses in the x-axis direction; and the Z decoupling masses are oppositely arranged at inner sides of the Z proof masses in the x-axis direction. The X / Y proof mass is elastically connected to the driving structures adjacent thereto, the Z proof masses are elastically connected to the driving structures adjacent thereto, and the Z decoupling masses are elastically connected to the Z proof masses adjacent thereto. The gyroscope improves the Coriolis conversion rate of the X / Y proof mass, maximizes the utilization of the chip area, reduces chip size and cost, and reduces coupling errors and quadrature errors, thereby improving sensing accuracy.

A method of operating a memory device includes receiving a quadrature clock and performing quadrature error correction of the quadrature clock in a non-sequential scheme, wherein the quadrature clock includes a first clock, a second clock, a third clock, and a fourth clock, having a sequential phase.

The invention discloses a non-calibration mirror image rejection degree improving method based on vector addition, which is applied to a radio frequency transceiver, and aims to overcome the difficulty in realizing non-calibration mirror image rejection in the existing radio frequency transceiver and the defects in the aspects of power consumption, size and the like of the non-calibration mirror image rejection in the existing radio frequency transceiver. And automatically correcting the previous amplitude error into a phase error after vector addition by using vector addition, and then carrying out amplitude control after vector addition to automatically correct the amplitude error, thereby completing calibration-free orthogonal error correction. The method can replace a conventional method for orthogonally calibrating and suppressing a mirror image component based on a filter or multipath control signals, and provides a non-calibration mirror image suppression scheme under the condition of power consumption and size limitation.

This disclosure provides a method and system for jointly estimating the LO leakage and quadrature error parameters of a transmitter RF front-end (e.g., a direct upconversion transmitter RF front-end). The proposed method utilizes a PN sequence inserted at the transmitter baseband. On the receiver side, an RX accumulator is implemented to sum the receiver signal to utilize the despreading gain from the same PN sequence from the transmitter side. Through the despreading process, the receiver-transmitter channel can be estimated and used to extract the quadrature error parameters. The estimated channel can also be used to eliminate user data interference presented in the RX accumulator output, which can be further used to calculate the LO leakage.

The application belongs to the technical field of motor control, and discloses a magnetic encoder quadrature error adaptive compensation method, whether the correction coefficient is empty is judged, if empty, a correction coefficient calibration process is executed, otherwise a single sampling point correction coefficient verification process is entered. The application does not need to design a hardware feedback circuit, can directly carry out digital processing on the sine and cosine signals collected by the magnetic encoder, realizes adaptive compensation of the quadrature error in the case of unknown signal frequency, can improve the detection precision and reliability of the magnetic encoder, effectively improves the production test efficiency, and reduces the time cost.

This application proposes an ultra-wideband vector modulation phase shifter and phased array system, comprising a cascaded quadrature signal generation circuit, a quadrature error correction circuit, an I-channel amplitude adjustment circuit, a Q-channel amplitude adjustment circuit, and a quadrature signal synthesis circuit. The quadrature signal generation circuit converts the initial differential signal into an I-channel differential signal and a Q-channel differential signal, and outputs the signals to the quadrature error correction circuit. The quadrature error correction circuit corrects the quadrature error of the received differential signal and outputs the corrected I-channel differential signal and Q-channel differential signal. The I-channel amplitude adjustment circuit and the Q-channel amplitude adjustment circuit adjust the amplitude of the received signal and transmit the adjusted signals to the quadrature signal synthesis circuit. The quadrature signal synthesis circuit combines the two received differential quadrature signals into a target differential signal. The integrated generation and correction circuit structure achieves the expansion of the quadrature signal bandwidth, effectively improving the operating bandwidth of the vector modulation phase shifter.

The application discloses an improved flux linkage observer position sensor observation method and system, comprising the following steps: constructing a motor model, and estimating a flux linkage vector; performing amplitude normalization processing on the flux linkage vector, and constructing a quadrature error signal; inputting a phase-locked loop, and obtaining a motor angle and a motor estimated rotating speed. The application has high adaptability, is small in system dependence degree, and is convenient to transplant in different systems.

A method of operating a radio frequency (RF) transceiver includes transmitting a narrowband calibration signal using a transmit channel of the RF transceiver, wherein a transmitted output signal includes a sideband of the calibration signal and a sideband of a digital-to-analog converter (DAC) image signal produced by DAC circuitry of the transmit channel; sampling the transmitted output signal using an analog-to-digital converter (ADC) circuit; filtering the transmitted output signal sampled by the ADC circuit to reduce power of the sideband of the calibration signal; attenuating DAC signals produced by the DAC circuitry to reduce power of the sideband of the DAC image signal; restoring the power of the sideband of the calibration signal sampled by the ADC circuit; and performing quadrature error correction (QEC) using the output of the ADC circuit.

The application discloses a zero intermediate frequency receiver quadrature error calibration method and device, in which an initial clock signal of a phase-locked loop of a zero intermediate frequency receiver is acquired; the initial clock signal is subjected to delay demodulation to determine a first clock signal and a second clock signal; wherein the phase difference between the first clock signal and the second clock signal is 180°; whether there is a duty cycle deviation between the first clock signal and the second clock signal is detected; when the duty cycle deviation is detected, the initial clock signal is calibrated based on the duty cycle deviation. Thus, by subjecting the initial clock signal of the phase-locked loop to delay demodulation, two opposite phase clock signals are determined, the duty cycle deviation of the two signals is used to feed back and adjust the duty cycle of the initial clock signal, a stable closed loop system is formed, and higher precision quadrature error calibration can be realized under the premise of lower static power consumption.

The present application discloses an orthogonal error detection device, method, rotary digital converter and medium, which relate to the technical field of rotary digital converters, including: processing the excitation phase output by the rotation phase and excitation phase correction module through a frequency synthesis module to obtain a first excitation signal and a second excitation signal; processing the resolver sine signal, the resolver cosine signal, the first excitation signal and the second excitation signal through a demodulation module to obtain a demodulation signal and a detection signal; controlling the demodulation signal to output the rotation phase through a rotation phase extraction module; and controlling the detection signal to output an output signal through a filter module, and then controlling the output signal to pass through an orthogonality error detection module to obtain an orthogonality error signal. By only adding the filter module and the orthogonality error detection module to the main demodulation device, the orthogonality error detection function can be taken into account on the basis of the main demodulation function with very little hardware expenditure.

A device includes a transmission clock circuit that includes a phase interpolator circuit and a transmission differential to quadrature phase generator. The phase interpolator circuit interpolates phases and provides phase interpolated first clock signals and phase interpolated second clock signals. The transmission differential to quadrature phase generator, duty cycle corrects each of the phase interpolated first clock signals and the phase interpolated second clock signals, quadrature error corrects each of the duty cycle corrected phase interpolated first clock signals and the duty cycle corrected phase interpolated second clock signals, outputs transmission clock signals based on the quadrature error corrected duty cycle corrected phase interpolated first clock signals, and outputs multiple clock phases and a track signal based on the quadrature error corrected duty cycle corrected phase interpolated second clock signals.

The present disclosure relates to a MEMS gyroscope with improved quadrature error rejection. The MEMS gyroscope is formed by a substrate, a first mass and a second mass, wherein the first mass and the second mass are suspended above the substrate and in a rest state extend in an extension plane defining a first direction and a second direction transverse to the first direction. The MEMS gyroscope further has a drive structure coupled to the first mass and configured to, in use, move the first mass in the first direction, and an elastic coupling structure extending between the first mass and the second mass and configured to couple movement of the first mass in the first direction with movement of the second mass in the second direction. The elastic coupling structure has a first portion having a first stiffness and a second portion having a second stiffness greater than the first stiffness.

The invention relates to the field of gyroscopes, and provides a three-axis gyroscope which comprises a driving structure, a first sensing structure connected with the driving structure, an X / Y-axis detection decoupling structure connected with the driving structure, and a second sensing structure and a third sensing structure connected with the X / Y-axis detection decoupling structure, the first sensing structure comprises two Z-axis mass blocks and two Z-axis detection decoupling structures, the two Z-axis mass blocks are oppositely spaced in the Y-axis direction, the two Z-axis detection decoupling structures are arranged between the two Z-axis mass blocks, and the two Z-axis mass blocks and the two Z-axis detection decoupling structures are symmetrically arranged with the X-axis direction as the symmetry axis; the first sensing structure further comprises a Z-axis detection decoupling structure coupling structure arranged between the Z-axis detection decoupling structures; by arranging the Z-axis detection decoupling structure, the Z-axis quadrature error is reduced, and the signal-to-noise ratio of the device is improved.

Methods, systems, and devices for four-phase clocking techniques, and in particular for a hybrid clock cycle correction and quadrature error correction (DCC-QEC) circuit, are described. The DCC-QEC circuit comprises a DCC circuit configured to generate two-phase clock signals based on external clock signals. The DCC circuit is self-calibrating without receiving a reference signal.The DCC-QEC circuit further comprises one or more QEC circuits coupled to the DCC circuit, each of the QEC circuits comprising a pair of phase dividers configured to convert the two-phase clock signals into four-phase clock signals, and an offset matcher configured to match clock offsets associated with a subset of the four-phase clock signals based on QEC matching codes and in an open-loop manner, wherein data from multiple lanes of parallel data channels based on the offset-matched four-phase clock signals are serialized and sent to outside a device comprising the DCC-QEC circuit.

An adaptive phase alignment circuit includes: a digitally controlled phase shifter for adjusting the phase of a first signal; a phase-locked loop for performing phase-locked filtering on the phase-shifted first signal to obtain a second signal from the first signal; a phase detector for comparing the phases of the second signal and a third signal to obtain a phase difference between the second and third signals, wherein a specific phase alignment relationship exists between the second and third signals; a signal conversion module for converting the phase difference into a digital quantity; an adder for calculating a phase adjustment control variable for the first signal; and, based on the phase adjustment, causing the digitally controlled phase shifter to adjust the phase of the first signal to align with the third signal. Based on this circuit, the present disclosure also provides a gyroscope measurement and control circuit that uses an adaptive phase alignment circuit to align the gyroscope's quadrature error with its carrier signal by 90 degrees, thereby facilitating a coherent demodulator to accurately extract the Coriolis shift. The Coriolis shift can then be used to calculate the gyroscope's angular velocity.

Systems and methods are provided for generating timing control signals for phase and duty cycle trimming to reduce or eliminate a quadrature error of a clock signal in a memory device. The memory device employs a trim circuit to perform phase tuning to reduce or eliminate the quadrature error. Different phase tuning settings are used by the trim circuit for different types of quadrature errors. The trim circuit adjusts different phases of the clock signal independently or dependently based on the phase tuning settings.

The invention discloses a three-axis fluxgate sensor orthogonality error calibration method and device, equipment, a medium and a product, and relates to the field of error calibration, and the method comprises the steps: obtaining a magnetic measurement data set of a to-be-calibrated three-axis fluxgate sensor; according to the magnetic measurement data set, geometric parameters of the ellipsoid where the magnetic measurement sampling points are located are fitted, and normalized ellipsoid geometric parameters are obtained; and obtaining a three-axis fluxgate orthogonality parameter according to the parameter normalization ellipsoid geometric parameter and a pre-constructed three-axis fluxgate orthogonality parameter expression represented by the parameter normalization ellipsoid geometric parameter. According to the method, under the condition that contribution of the sensitivity error and the zero offset error to the measurement error of the fluxgate sensor is considered, the orthogonality parameter can be independently obtained, the sensitivity and the zero offset error are not needed, the three-axis orthogonality detection capability and precision of the three-axis fluxgate sensor are improved, and the reliability of a detection result is improved.

The invention discloses a quadrature error detection device and method, a rotary digital converter and a medium, and relates to the technical field of rotary digital converters, and the method comprises the steps: carrying out the processing of a rotation phase and an excitation phase outputted by an excitation phase correction module through a frequency synthesis module, and obtaining a first excitation signal and a second excitation signal; processing the resolver sine signal, the resolver cosine signal, the first excitation signal and the second excitation signal through a demodulation module to obtain a demodulation signal and a detection signal; the demodulation signal is controlled to output a rotation phase through a rotation phase extraction module; the detection signal is controlled to pass through the filter module to output the output signal, and then the output signal is controlled to pass through the orthogonality error detection module to obtain the orthogonality error signal, so that the filter module and the orthogonality error detection module are added on the basis of the main body demodulation device, and the hardware cost is very low; therefore, the orthogonality error detection function is considered on the basis of the main body demodulation function.

The invention relates to phase and duty cycle trimming for multi-phase clocking. Systems and methods are provided for generating timing control signals tailored for phase and duty cycle to reduce or eliminate quadrature errors of clock signals in memory devices. The memory device employs a trimming circuit to perform phase tuning to reduce or eliminate the quadrature error. The trimming circuit uses different phase tuning settings for different types of quadrature errors. The trimming circuit adjusts different phases of the clock signal independently or dependently based on the phase tuning settings.

The invention provides a magnetic sensor and a quadrature error compensation method thereof.The magnetic sensor comprises a first magnetic sensing unit and a second magnetic sensing unit, the placement included angle between the first magnetic sensing unit and the second magnetic sensing unit is 90 degrees + / -beta, beta is a quadrature error angle, the first magnetic sensing unit senses a first magnetic sensing signal, and the second magnetic sensing unit senses a second magnetic sensing signal; the second magnetic sensing unit senses to obtain a second magnetic sensing signal; and the quadrature error compensation unit compensates the second magnetic sensing signal according to the quadrature error angle beta and the first magnetic sensing signal to obtain a second magnetic sensing compensation signal. In this way, errors caused by the orthogonal error angle beta can be compensated.

According to an embodiment, a circuit for quadrate error correction is proposed. The circuit includes a set of first resistors receiving a demodulated low-voltage differential signal from gyroscope sense electrodes; an ICMFB circuit with adjustable current sinks maintaining a low-voltage input level by controlling current; an HV driver circuit creating a high-voltage differential output from the low-voltage input, supplied to gyroscope correction electrodes; a set of second resistors where the input-to-output differential gain is defined by their relative resistances; and an output common-mode feedback circuit adapting the high-voltage output to a low-voltage for the HV driver.

The present application belongs to the field of signal calibration, and particularly relates to a system and method for calibrating transmitting quadrature error by using a receiving channel, aiming at solving the problem that the transmitting quadrature calibration module of the existing zero intermediate frequency architecture cannot track in real time and has poor calibration effect. The system comprises: a calibration tone generation module, configured to generate a single tone signal of one or more frequencies and transmit the signal through a transmitting channel; and further configured to compensate and calibrate the transmitting signal according to the transmitting channel quadrature error estimated by a QEC calibration module; the QEC calibration module, configured to estimate the quadrature error of the receiving channel and compensate and calibrate, and estimate the transmitting channel quadrature error; and a channel estimation module, configured to estimate the channel response between the transmitting channel and the receiving channel and compensate and calibrate based on the single tone signal generated by the calibration tone generation module and the signal compensated and calibrated by the QEC calibration module. The present application can track the transmitting quadrature error in real time, and effectively improve the quadrature of the radio frequency transmitting signal of the zero intermediate frequency architecture.

A semiconductor system and a method for operating the semiconductor system are provided. The semiconductor system comprises a duty cycle corrector (DCC) and an analog quadrature error corrector (QEC). The DCC is configured to receive an input clock signal to adjust a duty cycle of the input clock signal and generate a first modified clock signal. The analog QEC is configured to receive the first modified clock signal. The analog QEC is configured to adjust a delay of the first modified clock signal and generate a first output clock signal and a second output clock signal. The second output clock signal delays or advances a quarter of period from the first output clock signal. The analog QEC comprises a first inverter chain, a phase error detector (PED) and a first low-pass filter (LPF).

The application discloses a kind of hemispherical resonator gyro closed-loop control method and device, hemispherical resonator gyro and its circuit board, by the vibration of gyro is decomposed into the superposition of two traveling waves, three complex numbers are constructed based on two traveling waves and reference drive signal, drive vector is calculated via the three complex numbers constructed, the module and amplitude angle of complex number are controlled respectively, and the closed-loop control of hemispherical resonator gyro is completed.Because subsequent operation is normalized into complex number module and amplitude angle, code reusability is high, and only amplitude control loop is needed to control the module of the first two complex numbers, the number of control loop is reduced, thereby reducing the calculation workload, in addition, the calculation and suppression of quadrature error are avoided in closed control process, thereby reducing error residue, and improving the driving force calculation precision.

An apparatus includes a transmit clock circuit including a phase interpolation circuit and a transmit differential to quadrature phase generator. The phase interpolation circuit interpolates a phase and provides a phase interpolated first clock signal and a phase interpolated second clock signal. The transmission differential to quadrature phase generator performs duty cycle correction on each phase interpolated first clock signal and each phase interpolated second clock signal, performs quadrature error correction on each duty cycle corrected phase interpolated first clock signal and each duty cycle corrected phase interpolated second clock signal, and performs quadrature error correction on each duty cycle corrected phase interpolated first clock signal and each duty cycle corrected phase interpolated second clock signal. A transmission clock signal is output based on a quadrature error corrected duty cycle corrected phase interpolated first clock signal, and a plurality of clock phases and a tracking signal are output based on a quadrature error corrected duty cycle corrected phase interpolated second clock signal.

The invention discloses an improved flux linkage observer position-sensorless observation method and system, and the method comprises the following steps: constructing a motor model, and estimating a flux linkage vector; performing amplitude normalization processing on the flux linkage vector to construct an orthogonal error signal; and inputting a phase-locked loop to obtain a motor angle and a motor estimated rotating speed. The method is high in adaptability, small in system dependence degree and convenient to transplant in different systems.

The memory device includes a clock receiver receiving an external clock signal, a transmitter receiving first to Nth data in parallel and sequentially outputting the first to Nth data based on first to Nth clock signals including different phases, and a QEC circuit correcting a skew between the first to Nth clock signals, wherein the external clock signal includes a same frequency as the first to Nth clock signals, and the QEC circuit selectively receives the first clock signal among the first to Nth clock signals, generates the second clock signal including a phase different from a phase of the first clock signal based on a delay operation with respect to the first clock signal, and corrects the skew between the first to Nth clock signals by performing a phase comparison between the first to Nth clock signals generated based on the first and second clock signals.