118results about "Generator stabilization" patented technology

The invention discloses a system reference clock frequency accuracy automatic calibration circuit and a calibration method thereof, and belongs to the technical field of frequency sources, the calibration circuit comprises a first crystal oscillator, a first power divider, a second power divider, a second crystal oscillator, an analog switch, a radio frequency switch, a detector, a comparator, an FPGA controller, a digital analog converter, an operational amplifier and a temperature sensor. When an external high-precision reference clock is accessed, the FPGA controller automatically switches a frequency measurement reference, performs high-precision frequency measurement on a 100MHz signal output by the first crystal oscillator, and judges whether calibration is needed or not according to frequency offset; if calibration is needed, the output voltage of the digital-to-analog converter is adjusted, the Vc end of the first crystal oscillator is controlled after operational amplification, and frequency closed-loop adjustment is achieved. According to the method, the crystal oscillator does not need to be disassembled, calibration is rapidly completed on site, and system availability and long-term frequency stability are remarkably improved.

The invention discloses a GPS oscillator taming system and method based on PID parameter adaptive adjustment, and the system comprises a forgetting factor dynamic updating module which is used for dynamically updating a forgetting factor with the variance of the frequency error of VC-TCXO as a negative index; the system identification module is used for estimating ARX model parameters of the VC-TCXO by adopting a recursive least square algorithm with the updated forgetting factor; the model parameter mapping module is used for mapping the estimated ARX model parameters to obtain PID control parameters; the incremental PID controller is used for calculating a frequency control word increment based on the frequency error; the digital-to-analog converter is used for calculating according to the frequency control word increment to obtain a frequency control word and converting the frequency control word into analog voltage; and the VC-TCXO is used for obtaining the frequency of the GPS reference signal based on the analog voltage corresponding to the frequency control word so as to complete frequency taming. The method is high in calculation efficiency and robustness, and can adapt to the dynamic change and external disturbance of the controlled object in real time.

A clock integrated circuit (100) is provided. The clock integrated circuit includes: a first clock generator (110) which includes a crystal oscillator (XTAL) configured to generate a first clock signal (fxo); and a second clock generator (120) which includes a resistance-capacitance (RC) oscillator (121) and a first frequency divider (122), and is configured to: generate a second clock signal (fRTC)using the first frequency divider (122) based on a clock signal (fRCO) output from the RC oscillator (121); perform a first calibration operation for adjusting a frequency division ratio of the first frequency divider (122) to a first frequency division ratio based on the first clock signal (fxo) ; and perform a second calibration operation for adjusting the first frequency division ratio to a second frequency division ratio based on a sensed temperature.

The invention relates to the technical field of ultrasonic transducers, in particular to an ultrasonic transducer signal anti-interference transmission method and device, and the device comprises a signal preprocessing unit, an anti-interference unit, an isolation driving unit and a receiving demodulation and decoding unit. The signal preprocessing unit receives the original electric signal and performs differential amplification to generate a differential signal; the anti-interference unit collects the working environment temperature in real time through the temperature monitoring module, the coding strategy selection module and the modulation parameter control module dynamically select and optimize coding rules and adjust modulation parameters according to the working environment temperature, and the signal processing module converts differential signals into digital signals and completes coding modulation. The isolation driving unit performs signal isolation and power amplification; the receiving demodulation and decoding unit demodulates and decodes according to a corresponding rule and restores the ultrasonic signal; according to the invention, the coding rule, the modulation parameter and the heat dissipation strategy are dynamically adapted through temperature monitoring, the high-temperature performance drift of the anti-interference unit is inhibited, and reliable transmission of signals of the ultrasonic transducer is ensured.

Oscillator. The present invention provides an oscillator in which external heat is less likely to be transmitted to a vibrating element, and which has stable frequency characteristics. The oscillator has: an outer package; an inner package housed in the outer package and fixed to the outer package via a heat-insulating member; a vibrating element housed in the inner package; a temperature sensor; a first circuit element including an oscillation circuit that causes the vibrating element to oscillate and generates an oscillation signal that is temperature-compensated based on the temperature sensor, the first circuit element being housed in the inner package; and a second circuit element fixed to the outer package and including a frequency control circuit that controls the frequency of the oscillation signal.

The present invention provides phase interpolator including a phase detector, a filter and an oscillator is disclosed. The phase detector is configured to receive a first clock signal and a second clock signal, and sample the first clock signal and the second clock signal to generate a detection result, wherein phases of the first clock signal and the second clock signal are different. The filter is configured to filter the detection result to generate a filtered detection result. The oscillator is configured to control frequencies of the first clock signal and the second clock signal, or control a frequency of a sampling clock signal of the phase interpolator according to the filtered detection result.

The present invention relates to a radio transmitter (200) for operating a radio transmission system (100), preferably an SRD radio transmission system, between at least one radio transmitter (200), preferably between a plurality of radio transmitters (200), and a radio receiver (300) operating as a base station, wherein the respective radio transmitter (200) sends a telegram in the form of a data packet or a plurality of successively sent partial data packets to the radio receiver (300) at specific transmission times, each as a burst or bursts, wherein the respective radio transmitter (200) has a quartz crystal (201) which generates an oscillation for a timer, on the basis of which the timer determines the start and / or end times of the transmission of the respective burst, wherein the quartz crystal (201) is characterized by a quartz error profile (F1) which determines the original temperature dependence of the quartz error of the quartz crystal (201).To solve the problem of providing a radio transmitter that allows for the time-accurate transmission of telegrams even when its hardware does not enable alignment with the transmission frequency or carrier frequency of the radio signal, compensation means for the quartz error of the quartz crystal (201) are provided, which change, in particular shift, the quartz error curve (F1).

A circuit for reducing a temperature-induced frequency drift in a voltage to current (V2I) converter based voltage-controlled oscillator (VCO) for at least one wide band phase-locked loop (PLL), the circuit includes a V2I resistor node of the V2I converter, the V2I resistor node being at one end of a resistor, the VCO, and a current controlled oscillator (CCO), and the circuit is configured to provide a fixed offset current to the V2I resistor node to cause at least one V2I output current to have a value conversely proportional to absolute temperature (CTAT), the at least one V2I output current being output by the V2I converter, and mirror the at least one V2I output current to the CCO to reduce the temperature-induced frequency drift at a lower frequency band of the VCO.

The application discloses an inductor coil, a voltage-controlled oscillator and a method for improving gate voltage swing, and relates to the technical field of inductor coils. The inductor coil comprises a P-side inductor coil branch and an N-side inductor coil branch, and the P-side inductor coil branch is connected with the N-side inductor coil branch. The P-side inductor coil branch comprises a first P-side inductor and a second P-side inductor connected in series, and the connection point of the first P-side inductor and the second P-side inductor is a first tapping point, which is used for increasing P-side passive gain. The N-side inductor coil branch comprises a first N-side inductor and a second N-side inductor connected in series, and the connection point of the first N-side inductor and the second N-side inductor is a second tapping point, which is used for increasing N-side passive gain. The first P-side inductor is connected with the first N-side inductor. When the inductor coil is applied to a resonant cavity of a voltage-controlled oscillator, passive gain can be used to improve gate voltage swing, reduce saturation time and realize current noise suppression.

The application provides an electronic watch running time precision regulation system, and relates to the technical field of data processing.The system is used for collecting temperature values, voltage values and cumulative running time, counting the number of pulses output by a crystal oscillator in a unit time, obtaining state data and basic frequency data, calculating frequency offset values in different periods, performing window sliding, calculating drift trend values in different windows, calculating the difference between different states between adjacent periods, obtaining state change values, combining and analyzing the state change values with a frequency drift trend sequence, obtaining a state response coefficient set, identifying effective disturbance components in state change vectors of different periods, calculating pulse compensation values in different periods, obtaining pulse compensation data, correcting timing pulses, obtaining a pulse output sequence, and updating the time of the electronic watch according to the pulse output sequence.The application can regulate the pulse signal of the electronic watch and ensure the precision of running time.

This invention relates to a ground-based analog frequency conversion system for satellite payloads and its implementation method. The system includes: a filtering and coupling module for receiving high-frequency signals in the Q and V bands and splitting them into a coupling signal and a main signal, which are then transmitted to a detector module and a limiter, respectively. The detector module detects the power of the coupling signal at different temperatures and feeds it back to the control module. The limiter limits the maximum strength of the main signal to protect the low-noise amplifier (LNO). The LNO amplifies the main signal and reduces noise. A phase-locked loop (PLL) and frequency conversion module down-converts the high-frequency signal to an intermediate-frequency (IF) signal. An IF filtering and amplification module suppresses spurious interference and amplifies the IF signal. A temperature compensation module and a gain control module adjust the attenuation value to achieve temperature compensation and ensure that the IF output signal strength meets preset requirements. All modules are integrated using micro-assembly technology. This system can reduce the power consumption and cost of satellite launch and communication.

The present invention provides a thermostatic piezoelectric oscillator capable of high-precision control of both the temperature of the heating element and the piezoelectric vibration of the piezoelectric vibrator, while reducing costs. The thermostatic piezoelectric oscillator (1) has a core (5) having a crystal resonator (50), an oscillator IC (51), and a heater IC (52). In the thermostatic piezoelectric oscillator (1), the core (5) is supported in a package (2) by an intermediate member (4) and sealed inside the package (2) in a sealed state.

This application discloses a crystal oscillator frequency self-calibration method, an electronic device, and a computer-readable storage medium. The method includes: acquiring a time deviation sequence; acquiring a voltage sequence; acquiring the processor's behavioral characteristics at the current wake-up time; determining the equivalent temperature of the crystal oscillator at the current wake-up time based on the time deviation sequence, voltage sequence, and processor behavioral characteristics; testing the target test frequency of the crystal oscillator with multiple different test capacitors connected using a matched test strategy based on the equivalent temperature of the crystal oscillator at the current wake-up time; and determining the final target capacitor connected to the crystal oscillator based on the target test frequency of the crystal oscillator with multiple different test capacitors connected and the multiple different test capacitors. This method can achieve self-calibration of the crystal oscillator frequency.

A phase-locked loop (PLL) circuit includes a PLL core circuit, at least one lookup table, and a control circuit. The PLL core circuit generates an output clock under an open-loop calibration phase and a closed-loop calibration phase. The control circuit loads PLL parameters that are derived from the at least one lookup table to the PLL core circuit, performs open-loop calibration upon a first part of the PLL parameters under the open-loop calibration phase of the PLL core circuit, and performs closed-loop calibration upon a second part of the PLL parameters under the closed-loop calibration phase of the PLL core circuit.

The invention discloses a high-precision temperature control circuit of a self-adaptive heating and cooling constant-temperature crystal oscillator, which is characterized in that on the basis of a traditional thermosensitive bridge and a heating circuit, a switch driving mode of a driving circuit is changed into a linear mode, namely a linear voltage comparison circuit is added, and meanwhile, a proportional-integral-differential (PID) circuit is connected behind the linear voltage comparison circuit, so that the temperature of the constant-temperature crystal oscillator is controlled. And the proportional-integral-differential (PID) circuit is connected with the heating / cooling circuit. When the thermo-sensitive bridge is unbalanced, the thermo-sensitive bridge generates a voltage signal difference related to temperature, and the voltage difference passes through the linear voltage comparison circuit and then is subjected to proportional-integral-differential (PID) operation to drive a thermoelectric cooler (TEC) of the heating / cooling circuit to heat or cool a circuit board where the thermo-sensitive bridge is located. The linear comparison circuit and the PID circuit are matched to regulate and control the voltage difference, then the heating / cooling circuit is controlled, the isolation degree is enhanced, the problem that temperature control fails when the external environment temperature exceeds the set temperature can be effectively solved, control is not in an on state or an off state any more and is related to the amplitude of the voltage difference, and the control reliability is improved. In this way, the temperature control precision is improved, and the temperature overshoot phenomenon is well restrained under the cooperation of the PID circuit.

Provided are a circuit device, an oscillator, and a processing system that can effectively use a temperature sensor circuit of the circuit device to perform accurate temperature detection. The circuit device includes an oscillation circuit that generates an oscillation signal using a vibrator; a temperature sensor circuit that outputs temperature detection data; a temperature compensation circuit that temperature-compensates an oscillation frequency of the oscillation signal based on the temperature detection data; a memory that stores correction data for correcting the temperature detection data to find a temperature; and an interface circuit that outputs the temperature detection data and the correction data.

Methods, systems, and computer program products are presented herein for circuit timing using ultra-low power (ULP) timing circuit systems. A ULP timing circuit system comprises a receiver circuit, phase lock loop (PLL) circuit, crystal oscillator (XO) circuit, temperature sensing and calibration circuit, and temperature compensation circuit. The receiver circuit is configured to receive a reference clock signal. The XO circuit is configured to produce an output clock signal. The PLL circuit is configured to produce a control signal based on the reference clock signal and output clock signal. The temperature compensation circuit is configured to produce a compensation signal based on an operating temperature. The temperature sensing and calibration circuit is configured to sense the operating temperature and to calibrate the XO circuit based on the operating temperature, control signal, and compensation signal to lock a frequency of the output clock signal to the reference clock signal.

The present application relates to the field of integrated circuit design, in particular to a clock source with temperature process voltage compensation. The present application improves the existing temperature process compensation module, so that the temperature process compensation module can compensate the voltage variation of temperature and process at the same time; a selection module is added between the temperature process compensation module and the voltage controlled oscillator, the four variation voltages output by the temperature process compensation module are compared, the largest variation voltage under the current temperature condition is selected as the compensation voltage Vctrl and output to the voltage controlled oscillator; at this time, the control voltage obtained is a curve fitted by straight lines with different slopes, which can be applied to the case of large frequency and large temperature variation, the fitting is very good, and the output frequency error is very small.

Disclosed is a quartz oscillator system comprising: a quartz oscillator comprising a quartz crystal and an oscillator circuit whose frequency is based on a resonant frequency of the quartz crystal; a monitoring module for monitoring an output frequency of the quartz oscillator; a control system external to the quartz oscillator, and configured to compare the output frequency with a setpoint frequency, and apply an adjustment signal to an electronic circuit of the quartz oscillator to adjust a frequency of the quartz oscillator based on the comparison with the reference frequency.

The embodiment of the application discloses a crystal frequency calibration circuit, method, chip and electronic equipment, and relates to the calibration field. According to a preset load capacitance value, the target value of two capacitor groups of a crystal oscillator is determined, the processor controls the opening or closing of each switch to realize the charging of the capacitor groups and the measurement of the charging time, the processor calculates the capacitance value of the capacitor groups according to the charging time measured by the counter and the charging current of the constant current source, adjusts the capacitance value of the adjustable capacitor in the capacitor group according to the difference between the calculated capacitance value and the target value, and until the capacitance values of the two capacitor groups are equal to the target value. The application realizes automatic matching of the capacitance value according to the actual requirement of the crystal oscillator, so that the precision of the resonant frequency of the crystal oscillator meets the requirement, the whole calibration process does not need manual participation, the time consumed in the crystal calibration link can be saved, and the calibration cost is reduced.

An inverter and a ring oscillator (100) comprising a plurality of the inverters arranged in a ring is disclosed. Each inverter (200) comprises an inverter input (210) and an inverter output (220), wherein the inverter output (220) of each inverter (200) in the ring is coupled to the inverter input (210) of the respective next inverter (200) in the ring. At least one (200) of the plurality of inverters comprises: a first NMOS transistor (250), comprising a first gate terminal (252) coupled to the respective inverter input (210), a first drain terminal (254) coupled to the respective inverter output (220), and a first source terminal (256); and a second NMOS transistor (260), comprising a second gate terminal (262), a second drain terminal (264) and a second source terminal (266), wherein said second source terminal (266) is coupled to said first drain terminal (254).

The invention discloses a temperature control circuit of an oven controlled crystal oscillator, which is characterized in that on the basis of a traditional thermosensitive bridge and a heating circuit, a switch driving mode of a driving circuit is changed into a linear mode, namely a linear voltage comparison circuit is added, and the linear voltage comparison circuit not only has a linear amplification function, but also has a PID (Proportion Integration Differentiation) calculation function. In addition, the heating circuit is connected with the voltage-controlled current source circuit. When the thermosensitive bridge is unbalanced, the thermosensitive bridge generates a voltage signal difference related to the temperature, the voltage difference drives a heating power tube of the heating circuit after being subjected to linear amplification and PID calculation through the linear voltage comparison circuit, and when the set temperature is reached, the thermosensitive bridge and the linear voltage comparison circuit output constant voltage. The heating circuit generates constant heating power, and the whole circuit reaches a balanced state. According to the invention, after the voltage difference is regulated and controlled through the linear comparison circuit, the heating power tube is controlled, and the control is not an on state or an off state, but is related to the amplitude of the voltage difference, so that the temperature control precision is improved, and under the cooperation of the PID circuit, the temperature overshoot phenomenon is well inhibited.

A circuit apparatus includes an oscillation control circuit configured to control oscillation of a resonator, a measurement unit configured to measure information corresponding to a frequency of an oscillation signal output from the oscillation control circuit, and an interface, and is configured such that, when a first signal that determines a measurement period received from outside, the measurement unit measures the information corresponding to the frequency of the oscillation signal output during the measurement period, and the interface outputs a measurement result of the information corresponding to the frequency.

An oven-controlled crystal oscillator according to one or more embodiments includes a core section having at least an oscillation IC, a crystal resonator, and a heater IC. The core section is hermetically encapsulated in a heat-insulating package. The core section is supported by the package via a core substrate. The core substrate is connected to the package outside a region where the core section is provided in plan view.

The voltage-controlled oscillator can include a voltage-current conversion circuit that outputs a control current corresponding to the control voltage, and a ring oscillator that generates an output signal with a frequency corresponding to the control current. According to an embodiment, by using a voltage-current conversion circuit, it is possible to design a voltage-controlled oscillator that can operate even with a relatively low supply power and have stable characteristics even when the temperature changes.

The invention provides an electronic clock travel time precision regulation and control system, and relates to the technical field of data processing, and the system is used for collecting a temperature value, a voltage value and accumulated operation time, counting the number of pulses output by a crystal oscillator in unit time, obtaining state data and basic frequency data, calculating frequency deviation values in different periods, and adjusting the travel time precision of the electronic clock. Performing window sliding, calculating drift trend quantity values in different windows, calculating a difference value of different states between adjacent periods to obtain a state variable quantity, combining the state variable quantity with a frequency drift trend sequence for analysis to obtain a state response coefficient set, and identifying effective disturbance components in state change vectors of different periods; and calculating pulse compensation amounts in different periods to obtain pulse compensation data, correcting the timing pulse to obtain a pulse output sequence, and updating the time of the electronic clock according to the pulse output sequence. According to the invention, the pulse signal of the electronic clock can be regulated and controlled, and accurate travel time is ensured.

The invention belongs to the technical field of power system synchronization, and particularly relates to a three-phase phase-locked loop control method and device. The method comprises the following steps: acquiring a q-axis power grid voltage sampling value of a three-phase power grid voltage sampling value under a two-phase rotating coordinate system; inputting the q-axis power grid voltage sampling value into a complex coefficient filtering sliding mode observer, extracting alternating current frequency multiplication disturbance brought by the distorted power grid voltage, and obtaining a q-axis voltage estimated value, a direct current estimated value in the alternating current frequency multiplication disturbance and a total alternating current estimated value in the alternating current frequency multiplication disturbance; the complex coefficient filtering sliding-mode observer is obtained by connecting a complex number filtering item of a complex coefficient filter in parallel in the sliding-mode observer; and calculating a phase angle estimation value of the three-phase phase-locked loop after feedback compensation based on the q-axis voltage estimation value, the direct current quantity estimation value in the alternating current frequency multiplication disturbance, the total alternating current quantity estimation value in the alternating current frequency multiplication disturbance and the power grid phase voltage amplitude. The control efficiency and accuracy of the phase-locked loop are improved, and the method has good stability and robustness.

A low temperature drift ring oscillator, a chip and a communication terminal are provided. [Solution] A low-temperature drift ring oscillator includes a temperature tracking compensation circuit, an inverter oscillation circuit, and a buffer shaping circuit. The temperature-dependent impedance of diode-connected PMOS and NMOS transistors is used to track and compensate for the temperature characteristics of the impedance of the PMOS and NMOS transistors of an inverter in the inverter oscillation circuit. At the same time, the proportional relationship of the temperature coefficients of each variable in the temperature tracking compensation circuit is adjusted based on a bias current with a specific temperature coefficient, thereby converting the impedance temperature characteristics of the diode-connected PMOS and NMOS transistors into a voltage with a compensated temperature characteristic, and using this voltage as the supply voltage for the inverter oscillation circuit. This ensures that the oscillation frequency of the clock signal output from the ring oscillator is hardly affected by temperature.

The apparatus includes: a ring oscillator including a set of cascaded current-starved inverters arranged in a ring; a set of field effect transistors (FETs) coupled in series with the set of cascaded current-starved inverters between an upper voltage rail and a lower voltage rail, respectively; a negative to absolute temperature (NTAT) current source configured to generate a NTAT current; and one or more current mirrors coupling the NTAT current source to the set of FETs.

A temperature insensitive oscillator system. The system includes a substrate having a first surface and an opposing second surface, a CMOS device with one or more CMOS circuits attached to the first surface of the substrate, one or more piezoelectric transducers attached to an outer surface of the CMOS device, a voltage-controlled oscillator generating a RF frequency, which is transmitted as a plurality of short pulses to the one or more piezoelectric transducers, and one or more delays and oscillators using resistor and active components arranged alongside the piezoelectric transducers or on the CMOS device such that the voltage-controlled oscillator has minimal dependence on temperature, and has minimal deviation from a programmed frequency. In order to meet the requirement of low phase noise and high clock frequencies, a very quality factor resonator-based oscillator is phase locked with the BAW wave based oscillator to realize both an accurate and low-phase noise oscillator.