32 results about "Quadrature error" patented technology

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.

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.

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.

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.

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 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.

A semiconductor memory device is provided. The semiconductor includes a data clock buffer that receives a data clock signal from a memory controller and outputs a pair of differential input signals, an edge delay controller that adjusts duty ratios of the pair of differential input signals based on a control code and outputs a pair of corrected clock signals, a first unit delay path circuit that generates four output clock signals having different phases based on the pair of corrected clock signals, a rising edge multiplexer that serially outputs data corresponding to a rising edge of each of the four output clock signals, a second unit delay path circuit that generates four duplicate clock signals having different phases based on the pair of corrected clock signals and a quadrature error correction circuit detector that detects a duty error based on the duplicate clock signals and outputs the control code.

The embodiment of the application discloses a kind of radio frequency signal correction device, method and radio frequency transmitting device.Radio frequency signal correction device includes error estimation module, for according to radio frequency test signal and feedback test signal, determine the statistical test information of the radio frequency test signal, and according to the statistical test information, determine the quadrature error information of the radio frequency test signal;According to the quadrature error information, determine the initialization correction information of the radio frequency test signal;Wherein, the feedback test signal is obtained by forward and backward processing to the radio frequency test signal;Error correction module is connected with the error estimation module, for according to the initialization correction information, the input radio frequency signal is corrected.The device is in the form of digitization to realize the correction of quadrature consistency in working bandwidth, improve the correction accuracy, and not limited by working bandwidth, for the quadrature consistency correction of ultra-wideband channel is also applicable.

Methods, systems, and devices for techniques for four-phase clocking, and in particular, to a hybrid duty-cycle correction and quadrature error correction (DCC-QEC) circuitry are described. The DCC-QEC circuitry comprises a DCC circuit configured to generate two-phase clock signals based on external clock signals. The DCC circuit is self-calibratable without receiving a reference signal. The DCC-QEC circuitry further comprises one or more QEC circuits coupled to the DCC circuit, each of the QEC circuit comprising a pair of phase splitters configured to convert the two-phase clock signals to four-phase clock signals, and a skew adjuster configured to adjust, based on QEC adjustment codes and in an open loop manner, clock skews associated with a subset of the four-phase clock signals, in which data from multiple lanes of parallel data channels are serialized based on the skew-adjusted four-phase clock signals and transmitted to external of a device comprising the DCC-QEC circuitry.

The application relates to the technical field of fluxgate sensor detection, and discloses a phase adjustment and quadrature error self-adaptive correction system for a fluxgate sensor, which comprises a digital phase shifter, a double-channel demodulation module and a processing unit. The digital phase shifter performs phase shifting on a first reference signal generated by a digital signal synthesizer and having a frequency of twice that of an excitation signal based on a shifted phase, and generates a shifted signal. The double-channel demodulation module demodulates an in-phase direct current component and a quadrature error component. The processing unit is configured to perform the following: when VQ satisfies a preset closed-loop suppression condition and is not zero, a compensation signal is generated and superimposed on a to-be-demodulated signal; when VQ does not satisfy the preset closed-loop suppression condition, an updated locking phase is generated, VQ is detected based on the updated locking phase, and a closed-loop suppression process of the quadrature error component is performed. The application can eliminate the quadrature error, improve the stability of a demodulated direct current signal and the demodulation sensitivity.

The present disclosure is directed to a MEMS gyroscope formed by a substrate and a movable mass suspended on the substrate and configured to carry out a movement in a driving direction and in a detection direction perpendicular to each other. The movable mass has a first face and a second face opposite to the first face. The gyroscope also has a first and a second quadrature compensation electrode group, fixed to the substrate and capacitively coupled to the movable mass. The first quadrature compensation electrode group faces the first face of the movable mass, and the second quadrature compensation electrode group faces the second face of the movable mass. The first and the second quadrature compensation electrode groups each have a respective variable facing area on the movable mass as a result of the movement of the movable mass in the driving direction and are configured to exert an electrostatic force on the movable mass during the movement of the movable mass in the driving direction.

This disclosure provides an interface circuit for a capacitive MEMS sensor and a quadrature error suppression method. The quadrature error suppression method includes: acquiring a first-direction displacement from the capacitive MEMS sensor; providing a driving voltage to a driving electrode based on the first-direction displacement to cause the capacitive MEMS sensor to resonate along the first direction; acquiring a second-direction displacement from the capacitive MEMS sensor; amplifying and converting the second-direction displacement signal to obtain a detection signal containing a quadrature error component and an input angular velocity; performing in-phase quadrature demodulation on the detection signal; and obtaining an output signal characterizing the input angular velocity based on the demodulated quadrature component, in-phase component, and error elimination coefficient. The error elimination coefficient is obtained based on the changes in the in-phase component and quadrature component before and after an electrostatic force is applied to the torsion electrode. This application can obtain a more accurate error elimination coefficient, thereby improving the detection accuracy of the capacitive MEMS sensor.

The present invention provides a three-axis gyroscope and electronic products, including a drive structure used for driving the three-axis gyroscope, a first sensitive structure used for sensing an angular velocity in a first direction, a second sensitive structure used for sensing an angular velocity in the second direction, a third sensitive structure used for sensing an angular velocity in a third direction. The first sensitive structure, the second sensitive structure and the third sensitive structure can be mutually coupled in the first detection modality, the second detection modality and the third detection modality, which can effectively avoid the coupling error, achieve electrical orthogonal suppression and capacitance modality matching in the first detection modality, the second detection modality or the third detection modality, so that the structural performance loss can be compensated, thus reducing an orthogonal error and improving the detection accuracy and overall performance of the three-axis gyroscope.

An apparatus for correcting duty-cycle and phase errors of quadrature signals, which is capable of simultaneously detecting a quadrature error and a duty cycle error of the quadrature signals at one observation point and correcting the quadrature error and the duty cycle error, and a method therefor are disclosed. The apparatus for correcting duty-cycle and phase errors of quadrature signals according to an embodiment of the present disclosure includes a quadrature signal error detector configured to detect errors of quadrature signals including an I signal, which is an in-phase signal, and a Q signal, which is a quadrature phase signal; and a quadrature signal error compensator configured to compensate for duty cycles and phases of the quadrature signals depending on the errors of the quadrature signals.