22results about "Generator starter" patented technology

The phase-locked loop comprises a digital signal selector, a numerical control delay chain, a frequency sampling module, a frequency difference accumulation module and an exclusive-OR gate, and the digital signal selector can trigger the numerical control delay chain to generate an oscillation starting clock based on an output signal of the digital selector by receiving a starting pulse signal; the frequency sampling module can output corresponding frequency data according to the oscillation starting clock and an input reference clock, and the frequency difference accumulation module can output a corresponding frequency difference to the numerical control delay chain according to the frequency data and an input target frequency, so that the numerical control delay chain is triggered by an exclusive-OR gate output signal; and the output oscillation starting clock is corrected based on the frequency difference, so that the accurate oscillation starting clock is determined. The phase-locked loop is low in power consumption, quick in response and capable of realizing quick oscillation starting.

Oscillator circuit with an oscillator stage (OSC) and a first current source (I ddx ) which is designed to drive the oscillator stage (OSC), wherein the oscillator stage (OSC) comprises an oscillator stage input terminal, an oscillator stage output terminal, a crystal oscillator (X1) which is designed to supply an oscillation signal between the oscillator stage input terminal and the oscillator stage output terminal, wherein the crystal oscillator (X1) has a first oscillator terminal (x 11 ) and a second oscillator connection (x 12), wherein the oscillator circuit comprises an operational amplifier having an inverting input, a non-inverting input and an operational amplifier output, wherein the oscillator stage input terminal is coupled to the inverting input and the oscillator stage output terminal is coupled to the non-inverting input, and the operational amplifier output is coupled to the oscillator stage input terminal such that the oscillator stage input terminal and the oscillator stage output terminal are controlled to have an equal DC voltage level.

A method for operating a fast start-up oscillator system, which includes a reference oscillator and a quartz oscillator connected to an electronic oscillator circuit, which is provided to supply a master clock signal to a start-up controller configured to perform a fast start-up procedure of the quartz oscillator via the reference oscillator. The start-up controller includes a calculation unit and a memory unit for storing data in connection with the reference oscillator for starting the quartz oscillator. The method includes parameterising the calculation unit for starting the quartz oscillator, generating excitation bursts, determining a phase deviation in different successive periods between the oscillation of the reference oscillator and the oscillation of the quartz oscillator, calculating a frequency error in the calculation unit, and correcting the frequency of the reference oscillator to the frequency of the quartz oscillator.

The present invention relates to a crystal oscillator and a startup operation method of a crystal oscillator, the crystal oscillator comprising: a crystal resonator comprising a first terminal and a second terminal, an electronic oscillator circuit connected to the crystal resonator, a first capacitor comprising a first terminal and a second terminal, the second terminal being connected to the first terminal of the crystal resonator, a second capacitor comprising a first terminal and a second terminal, the second terminal being connected to the second terminal of the crystal resonator, characterized in that the crystal oscillator further comprises a switch comprising a first terminal, a second terminal and a third terminal, wherein the conductivity between the first terminal and the second terminal of the switch is controlled by the voltage at the third terminal, the first terminal of the switch is connected to the first terminal of the first capacitor, and the second terminal of the switch is connected to the first terminal of the second capacitor.

Oscillator and Method of Using an Oscillator This description concerns an oscillator (400) comprising: - a first connection terminal (130) and a second connection terminal (135); - an amplifier (115) connected between the first connection terminal (130) and the second connection terminal (135); and - a circuit (410) configured to generate an inductance between the first connection terminal (130) and the second connection terminal (135), the oscillator being configured to be connected to a crystal (150) between the first connection terminal (130) and the second connection terminal (135), and the amplifier (115) being configured to drive the crystal (150). Figure for the abbreviation: Fig. 4

To provide a method for operating an oscillator system having a quartz oscillator and a reference oscillator, with fast start-up and phase-locked operation.SOLUTION: A method includes the steps of: parameterizing a calculation unit 25 for starting a quartz oscillator 12 during a start-up phase of the quartz oscillator 12; generating excitation bursts to oscillate the quartz oscillator 12 and to be supplied to the quartz oscillator 12 and a phase realignment period, in successive different periods in the within the start-up phase of the quartz oscillator 12; determining a phase deviation in different successive periods between the oscillation of a reference oscillator 45 and the oscillation of the quartz oscillator 12; calculating a frequency error in the calculation unit 25 based on the phase deviation or a derivative of phase variation slope; and correcting the frequency of the reference oscillator 45 to the frequency of the quartz oscillator 12 within a limited acceptable margin of error.SELECTED DRAWING: Figure 2

A device includes an oscillator including at least one inductor and at least one capacitor and configured to generate, based on a positive supply voltage, an output signal oscillating in a resonance frequency of the at least one inductor and the at least one capacitor. The device further includes an oscillation detector configured to determine whether the output signal oscillates based on a clock signal and increase a loop gain of the oscillator until the output signal oscillates.

An oscillator arrangement is provided, comprising a relaxation oscillator (2) having an active state and an inactive state; a bias current circuit portion (16) arranged to provide a bias current (14) to the relaxation oscillator (2) during said active state; and an electronic switch (12) arranged to isolate said relaxation oscillator (2) from the bias current circuit portion (16) when in said inactive state. The oscillator arrangement is arranged to store an internal voltage value associated with said bias current (14) and the bias current circuit portion (16) is arranged to use the stored internal voltage value to generate the bias current (14) when the oscillator (2) is started up from the inactive state to the active state.

Disclosed in the present invention is a high-frequency crystal oscillator based on automatic phase error correction. The high-frequency crystal oscillator comprises a high-frequency crystal, a load capacitor, two single-pole double-throw switches, a ring oscillator, an 8-frequency-dividing circuit, a twisted ring counter, a peak detector, a buffer, a digital module, a multiplexer and an amplifier. In the present invention, when a circuit performs energy injection on a high-frequency crystal, a phase error between an injection signal and a crystal oscillation signal is also detected and automatically corrected, such that the phase error is always less than 45 degrees. The present invention ensures the continuous and efficient linear growth in the energy inside a high-frequency crystal, and greatly shortens the starting time required for the crystal to reach a stable oscillation amplitude, thereby realizing rapid starting; and on the basis of automatic phase error correction technology,

Methods and circuits for detecting and controlling for parasitic oscillations in a crystal oscillator circuit. An example method comprises initializing (710) power-up of the crystal oscillator circuit, wherein said initializing (710) power-up comprises increasing an effective transconductance of the crystal oscillator circuitry over time, at a first rate, and detecting (720) a frequency of oscillation of the crystal oscillator circuit. This example method further comprises, in response to determining that the detected frequency of oscillation is lower than a target frequency, restarting (730) power-up of the crystal oscillator, wherein said restarting power-up comprises increasing the effective transconductance of the crystal oscillator circuitry over time at a second rate that is slower than the first rate.

A circuit device is configured to switching between a first mode in which phase noise of an output clock signal is lower than that in a second mode and the second mode in which power consumption is smaller than that in the first mode, and the circuit device includes an oscillation circuit configured to generate an oscillation signal, a waveform shaping circuit configured to perform waveform shaping on the oscillation signal to obtain a rectangular wave clock signal; and an output circuit configured to output the output clock signal based on the clock signal. A driving capability of the waveform shaping circuit in the first mode is higher than a driving capability of the waveform shaping circuit in the second mode.

A control device coupled to an oscillator circuit and including a first output circuit, a synchronizer circuit, a hysteresis circuit, a stable circuit, and a second output circuit is provided. The first output circuit activates an oscillator circuit according to an activation signal so that the oscillator circuit generates an input clock. The synchronizer circuit synchronizes the activation signal to generate a synchronization signal. The synchronization signal is synchronized with the input clock. The hysteresis circuit directs the first output circuit to disable the oscillator circuit according to the synchronization signal. The stable circuit enables a transmission signal according to the input clock. When the transmission signal is enabled, the second output circuit uses the input clock as an output clock.

The application discloses a self-adaptive method for starting a passive crystal oscillator, and the method comprises the following steps: a. dividing a crystal oscillator starting process into N stages, each stage corresponding to a starting scheme; b. enabling the crystal oscillator to start; c. executing a first starting scheme to enter a starting process of a first stage; d. judging whether the crystal oscillator starts or not, and if not, executing step e; e. executing a next starting scheme to enter a starting process of a next stage; and f. repeatedly executing steps d-e until the crystal oscillator starts.

The present invention discloses a fast-start crystal oscillator based on phase interpolation synchronous injection, which includes a digital module, a time-to-digital converter, a ring oscillator, a phase interpolation module, a first and a second level shifter, an amplifier, a crystal, a first and a second load capacitor, a first to a fourth switch, and a comparator; the present invention accelerates the start of the crystal by means of intermittent energy injection into the crystal. During the injection interval, the time-to-digital converter is used to detect the time difference between the injection phase and the crystal oscillation signal, and the phase interpolation module is used to generate the correct injection phase to achieve fast start. The present invention realizes high-efficiency energy injection, ensures the stable growth of the crystal oscillation amplitude; and the synchronous injection technology based on the phase interpolation module reduces the accuracy requirement of the energy injection signal, reduces the design difficulty of the on-chip injection source while ensuring the start efficiency, and significantly optimizes the chip yield.

The application discloses a self-calibration crystal oscillator driving system, comprising: a crystal oscillator element for outputting an oscillation signal; a driving module connected with the crystal oscillator element for outputting a gain for maintaining oscillation of the crystal oscillator element by adjusting strengths of positive feedback and negative feedback; a peak detection module connected with the crystal oscillator element for performing peak detection on the oscillation signal of the crystal oscillator element and outputting a direct current signal; and a comparison feedback module connected with the peak detection module and the driving module for outputting a signal for adjusting a tail current of the driving module by analyzing the direct current signal so as to adjust the output gain of the driving module. The self-calibration crystal oscillator driving system can stabilize the amplitude of the crystal oscillator at a fixed value under the condition that various passive crystal oscillators are externally connected to an external circuit, and can eliminate the influence caused by power supply, temperature and device aging, thereby improving the stability and reliability of the whole circuit system.

The present invention relates to a clock stop monitoring circuit, a monitoring method, a chip system and a storage medium, comprising a crystal oscillator monitoring circuit, a clock switching circuit, a crystal oscillator recovery circuit and an exception handling circuit. The crystal oscillator monitoring circuit repeatedly monitors the crystal oscillator clock signal for stop, and outputs a crystal oscillator stop flag; the crystal oscillator recovery circuit outputs a crystal oscillator restart signal to an external crystal oscillator, and outputs a crystal oscillator recovery flag to the clock switching circuit after the external crystal oscillator is successfully restarted; when the clock switching circuit receives the crystal oscillator stop flag, it switches the operating clock to a high-frequency RC clock, and when the clock switching circuit receives the crystal oscillator recovery flag, it switches the operating clock to the external crystal oscillator. The present invention attempts to recover the crystal oscillator by restarting, which can effectively solve the stop problem caused by factors such as poor contact, and once the clock switching circuit detects that the crystal oscillator has recovered, it will automatically switch to a relatively accurate crystal oscillator clock, effectively enhancing the reliability and accuracy of the chip system.

Disclosed in the present invention is a high-frequency crystal oscillator based on automatic phase error correction. The high-frequency crystal oscillator comprises a high-frequency crystal, a load capacitor, two single-pole double-throw switches, a ring oscillator, an 8-frequency-dividing circuit, a twisted ring counter, a peak detector, a buffer, a digital module, a multiplexer and an amplifier. In the present invention, when a circuit performs energy injection on a high-frequency crystal, a phase error between an injection signal and a crystal oscillation signal is also detected and automatically corrected, such that the phase error is always less than 45 degrees. The present invention ensures the continuous and efficient linear growth in the energy inside a high-frequency crystal, and greatly shortens the starting time required for the crystal to reach a stable oscillation amplitude, thereby realizing rapid starting; and on the basis of automatic phase error correction technology.

The invention relates to oscillator circuits, corresponding systems and methods. A relaxation oscillator circuit includes one or more oscillator cores configured to generate an oscillating signal based on a controlled current applied thereto via a current flow line. The controlled current has a reduced standby value during a standby state of the oscillator circuit. The start-up circuit block is activated during a start-up phase of the oscillator circuit in response to a start-up enable signal asserted using a controlled current having a reduced standby value. The start-up circuit block includes a start-up current generator configured to generate a start-up current and to apply the start-up current from the start-up current generator to the oscillator core or one of the oscillator cores during a start-up phase.

To provide an oscillation circuit that shortens a wait time due to a large change in an oscillation frequency immediately after a power supply voltage is turned on and quickly outputs an oscillation signal whose oscillation frequency is stable.SOLUTION: An oscillation circuit 10 comprises: a voltage controlled oscillator 15 that generates a pulsed oscillation signal having a frequency corresponding to a control voltage; a power supply circuit 11 that generates an output voltage corresponding to the frequency of the oscillation signal when a power supply voltage is turned on; an LPF 14 that receives the output voltage of the power supply circuit and generates a control voltage; an enable generation circuit 12 that generates an enable signal during a period when the input voltage to the LPF from the power supply circuit is rising after having lowered than the control voltage immediately after the power supply voltage is turned on; a counter 16 that counts pulses of the oscillation signal in response to the enable signal and generates a mask signal until the count value reaches a prescribed value; and an OR circuit 17 that cuts off output of the oscillation signal while the counter is generating the mask signal and outputs the oscillation signal when the counter stops generating the mask signal.SELECTED DRAWING: Figure 1

A control device coupled to an oscillator circuit and including a first output circuit, a synchronizer circuit, a hysteresis circuit, a stable circuit, and a second output circuit is provided. The first output circuit activates an oscillator circuit according to an activation signal so that the oscillator circuit generates an input clock. The synchronizer circuit synchronizes the activation signal to generate a synchronization signal. The synchronization signal is synchronized with the input clock. The hysteresis circuit directs the first output circuit to disable the oscillator circuit according to the synchronization signal. The stable circuit enables a transmission signal according to the input clock. When the transmission signal is enabled, the second output circuit uses the input clock as an output clock.

The invention provides a control device and a micro-control circuit. The control device comprises a first output circuit, a synchronous circuit, a hysteresis circuit, a stabilizing circuit and a second output circuit, the first output circuit enables an oscillation circuit according to an enable signal, so that the oscillation circuit generates an input clock. The synchronization circuit synchronizes the enable signal to generate a synchronization signal. The synchronization signal is synchronized with the input clock. The hysteresis circuit requires the first output circuit to disable the oscillation circuit according to the synchronization signal. The stabilizing circuit enables a transmission signal according to the input clock. When the transmission signal is enabled, the second output circuit takes the input clock as an output clock.

An oscillator circuit of the relaxation type includes one or more oscillator cores configured to produce an oscillation signal based on controlled currents applied thereto via a current flow line. The controlled current has a reduced stand-by value during a stand-by state of the oscillator circuit. A startup circuit block is activated during a startup phase of the oscillator circuit in response to a startup enable signal asserted with the controlled current having the reduced stand-by value. The startup circuit block comprises a startup current generator configured to produce a startup current and to apply to the oscillator core or one of the oscillator cores during the startup phase the startup current from the startup current generator.