1297results about "Oscillations generators" patented technology

An output drive circuit includes: a totem-pole output including: a high-side transistor (HST) with drain and source, an output stage power supply voltage applied to the drain, the source connected to the first node (N1); and a low-side transistor with source and drain, a ground voltage applied to the source, the drain connected to N1; and a bootstrap part including a capacitor supplying charge to a gate of HST when on, the charge being charged when HST is off, and one terminal of the bootstrap part connected to N1, the output drive circuit further including: a first transistor (T1) that conducts when HST is to be on, T1 connected between a drive circuit power supply voltage and the gate of HST; and a second transistor conducting when HST is to be turned on, the second transistor connected between the other terminal of the capacitor and HST gate.

A temperature control device includes a temperature detector, a difference operation unit, a controller, a saturation processing circuit unit, a rewritable storage unit, and a conversion unit. The difference operation unit operates a digital value corresponding to a difference value between a detected temperature value and a target temperature. The controller calculates a manipulated variable using the digital value operated by the difference operation unit. The saturation processing circuit unit includes a digital circuit to limit an output value of the controller to a pre-set upper limit value. The rewritable storage unit stores the upper limit value read from a storage area of the rewritable storage unit and input into the saturation processing circuit unit. The conversion unit converts the output value of the saturation processing circuit unit into an analog signal to output the converted value as a control command value to the heater.

The invention discloses a low-power-consumption radiation-resistant quadrature voltage-controlled oscillator based on an SOI (Silicon On Insulator) process, relates to the technical field of quadrature voltage-controlled oscillators, and is used for solving the technical problems that an existing quadrature voltage-controlled oscillator is low in radiation resistance in a harsh radiation environment and does not have the characteristic of low power consumption. The invention discloses a low-power-consumption anti-radiation quadrature voltage-controlled oscillator based on an SOI process. The low-power-consumption anti-radiation quadrature voltage-controlled oscillator comprises a first voltage-controlled oscillator, a second voltage-controlled oscillator, a first tail filter and a second tail filter, the first voltage-controlled oscillator and the second voltage-controlled oscillator respectively form an LC resonant cavity with a parasitic capacitor of an inductor and a varactor through the inductor; the first tail filter is connected with the first voltage-controlled oscillator, and the second tail filter is connected with the second voltage-controlled oscillator; two inductors of the first tail filter and the second tail filter are coupled; lC resonant cavities of the first voltage-controlled oscillator and the second voltage-controlled oscillator output oscillation waveforms, and negative impedance is formed through configured transistor pairs, so that the waveforms are output constantly.

A CTAT circuit that generates a CTAT current. The circuit includes two SOI transistors of a first conductivity type arranged in a current mirror configuration where the gates of the two transistors and the back gate contact of one of the transistors is connected to the drain of the other transistor. The SOI transistor of the first conductivity type whose back gate contact is connected to the drain of the other SOI transistor of the first conductivity type is located in current path that carries a CTAT current. In some embodiments, the drains of the two transistors are each coupled to a drain of a respective one of a second pair of SOI transistors of a second conductivity type, where the second pair of SOI transistors are also configured in a current mirror configuration.

The invention provides a design method and system of a high-speed RC clock system. The system comprises a high-speed RC oscillator, a reference clock module, a clock calibration module, a trigger module and a state machine module. The method comprises the following steps of: controlling a calibration process through a state machine module, counting a high-frequency clock signal by taking a theoretical count value as a reference after a clock calibration module is triggered, judging whether the frequency has deviation or not and the direction of the deviation according to a counting result, performing stepping adjustment on a calibration value, and performing frequency adjustment on a high-speed RC oscillator. And circularly executing the calibration step until the counting result falls into an allowable error range. A phase-locked loop circuit does not need to be additionally arranged, high and low temperature calibration in the production stage does not need to be introduced, the chip design complexity, the manufacturing cost and the production test cost can be effectively reduced, meanwhile, high precision and stability of clock signals are ensured, and output of a low-cost, high-frequency and high-precision RC clock is achieved.

An electronic device may include wireless circuitry having an oscillator. The oscillator can include a first transistor having a source-drain terminal coupled to a tail node, a second transistor having a source-drain terminal coupled to the tail node, a first coil having a first terminal coupled to the tail node and having a second terminal coupled to a power supply line, and a second coil inductively coupled to the first coil. The first and second coils can be part of a balun. The balun can be coupled to a tunable capacitance. The tunable capacitance can include multiple differential switchable capacitor circuits. The balun and the tunable capacitance can form a balun phase noise filter configured to reduce a phase noise associated with the oscillator.

Technologies directed to a frequency multiplier circuit of a customer terminal (CT) for doubling and tripling a frequency of a local oscillator are described. One communication device includes a local oscillator (LO) to generate a first differential signal having a first frequency and a frequency multiplier circuit to generate a second differential signal having a second frequency that is double the first frequency or a third differential signal having a third frequency that is triple the first frequency. The frequency multiplier circuit includes a variable capacitance circuit that is programmable to one of multiple capacitances and a variable inductance circuit that is programmed to a first inductance for the second differential signal and to a second inductance for the third differential signal.

The invention relates to the technical field of radio frequency integrated circuits, and discloses a low-noise voltage-controlled oscillator circuit which comprises a source electrode following low-noise bias circuit with digital calibration, a source electrode following low-noise bias circuit with digital calibration, a source electrode following low-noise bias circuit with digital calibration and a source electrode following low-noise bias circuit with digital calibration, the cross-coupled amplifier array is composed of a plurality of units, and the source electrode of the cross-coupled amplifier array suppresses low-frequency noise through a resistance-capacitance feedback network and receives a digital amplitude calibration signal so as to dynamically adjust the number of working units and stabilize the output amplitude; the amplitude self-calibration loop consists of digital logic and a peak detector; the switched capacitor unit array is provided with stable direct-current bias; and a wide linear variable capacitor array driven by the stepped bias voltage. Through deep fusion of digital and analog technologies, the phase noise is remarkably reduced, the linear tuning range is widened, the amplitude stability is ensured, the power consumption is reduced, and the method is particularly suitable for a high-performance radio frequency communication chip of the Internet of Things.

The invention discloses a low-cost precise time keeping method, system and device based on a gating circulation unit, and relates to the technical field of power grid measurement. The method is executed when the synchronous phasor measurement device cannot receive external signals, and comprises the following steps: monitoring operation parameters which influence the frequency stability of an internal crystal oscillator of the phasor measurement unit in real time; calculating a current frequency error of the crystal oscillator in real time by using a crystal oscillator frequency drift prediction model based on a gated cycle unit network based on the operation parameters; generating a time correction amount according to the current frequency error; and applying the time correction to a local clock of the phasor measurement unit to compensate the frequency drift of the crystal oscillator so as to realize accurate time keeping. According to the invention, through accurate prediction of crystal oscillator errors and lightweight software compensation, the synchronous phasor measurement device adopting a low-cost crystal oscillator can also realize long-time high-precision time keeping, the hardware cost is obviously reduced, and the reliability of power grid monitoring during the Beidou / GPS lock losing period is improved.

The invention discloses a low-power-consumption voltage-controlled oscillator based on an SOI (Silicon On Insulator) process, relates to the technical field of integrated circuit design, and is used for solving the technical problem that an existing Colpitts oscillator is too high in power consumption and cannot be applied to a low-power-consumption integrated circuit. The invention discloses a low-power-consumption voltage-controlled oscillator based on an SOI (Silicon On Insulator) process. The low-power-consumption voltage-controlled oscillator comprises a Colpitts resonance circuit, a negative resistance unit and an LC filter network, the negative resistance unit is at least provided with a pair of RC network bias NMOS transistors and a pair of cross-coupled NMOS transistors, and the drain electrodes of the RC network bias NMOS transistors are connected with the Colpitts resonance circuit; the input end of the LC filter network is connected with the source electrodes of the cross-coupled NMOS transistors; the negative resistance unit biases the NMOS transistor through the RC network to introduce a feedback path to form a C-class oscillator structure, the Colpitts resonance circuit generates a first signal, and the first signal passes through the negative resistance unit and is output after common-mode noise is filtered by the LC filter network.

The invention relates to the technical field of radio frequency integrated circuits, and discloses a dynamic bias C-type voltage-controlled oscillator based on a CMOS (complementary metal oxide semiconductor) process, the voltage-controlled oscillator adopts a C-type structure, a cross-coupled network adds two resistors and a capacitor on the basis of a cross-coupled transistor, a circuit works in the C type by adjusting bias voltage at a resistor end, and the voltage-controlled oscillator works in the C type. The C-type voltage-controlled oscillator, a tail current source, a variable capacitance network, a switched capacitor array and a fixed LC resonance network form a core structure of the C-type voltage-controlled oscillator capable of numerical control tuning and voltage-controlled tuning, so as to determine the working frequency of the circuit and realize numerical control and voltage-controlled tuning functions; and the operational amplifiers with two bandwidth modes are introduced, so that the problem of difficult oscillation starting is solved, and the oscillation starting speed and the phase noise performance in a stable state are considered at the same time.

A thermodynamic relay gadget includes a set of one or more relay oscillators, an additional relay oscillator, a bias oscillator, and an on-chip controller. Respective ones of the relay oscillators have a time dependent mass or a time dependent frequency that is controllable, by the on-chip controller. The relay gadget is configured to relay thermodynamic information in analog form between an input oscillator of a first energy-based model and an output oscillator of a second energy-based model.

A system, for measuring a dielectric property of a medium, includes: a resonator; an oscillator electrically coupled to the resonator and configured to generate an electrical signal representing an oscillation of the oscillator when the resonator is disposed in a vicinity of the medium; and measuring circuitry that receives the electrical signal. The measuring circuitry determines, from the electrical signal, at least one of a resonance frequency of the resonator and a quality factor of the resonator. The measuring circuitry determines, from the at least one of the resonance frequency and the quality factor, the dielectric property of the medium.

A down-sampling function folds the thermal noise into a lower frequency band. A capacitor samples a voltage during a period of bus inactivity and supplies the sampled voltage to an input of operational amplifier in a loop filter of a phase-locked loop when the bus is active. The sampling frequency determines the reduction in thermal noise that can be achieved. The PLL generates a clock signal for a bus. A voltage generator charges the capacitor through a transistor when the bus is inactive. The transistor turns on responsive to the bus being inactive to allow the capacitor to charge and the transistor turns off responsive to the bus being active to isolate the capacitor and operational amplifier from the voltage generator. When the bus is active, the voltage across the capacitor is supplied to the operational amplifier.

The invention relates to the technical field of integrated circuits, and provides a multi-nuclear inductance-capacitance type voltage-controlled oscillator, which comprises at least two oscillation units which are symmetrically distributed and a digital control unit, wherein each oscillation unit comprises a switched capacitor array, and the oscillation units are in annular synchronous connection through a synchronous resistor; and the digital control unit is used for generating control signals for respectively controlling the oscillation units so as to control the switches of the switched capacitor arrays in the corresponding oscillation units through the control signals. According to the oscillator, the effect of improving the precision of the oscillator can be achieved by improving the precision of the switched capacitor array.

Localized heating can be provided using fixed-frequency planar transmission line resonators arranged along a main-line, and tuning an electromagnetic input signal frequency applied to the main line to selectively address and energize one or more planar resonators for also addressing and energizing one or more correspondingly located active substrate transducer heat sources for depositing heat in an adjacent active substrate. More generally, adjusting input signal frequency to select one or more planar resonators arranged along a main line can be used to selectively address and energize an electromagnetic-to-heat, an electromagnetic-to-vibration, or other transducer to controllably direct energy toward a desired transducer load.

The invention relates to the technical field of electronic circuits, and provides a temperature compensation circuit and an RC oscillator, the temperature compensation circuit comprises a voltage control module and a clock signal generation module, the voltage control module is used for outputting a control signal to the clock signal generation module according to the environment temperature; wherein the frequency of the control signal is related to the temperature of the environment; the clock signal generation module is used for generating a clock signal according to the control signal; wherein the duty ratio of the clock signal is related to the frequency of the control signal. According to the temperature compensation circuit, the clock signal with the duty ratio changing along with the environment temperature can be generated, and the precision of an RC oscillator and other circuits under the influence of the temperature is improved.

Piezoelectric materials, particularly ones with high quality factor used for mechanical antenna implementations, are sensitive to environmental conditions including temperature swings, humidity, vibration. Under the varying environmental conditions, the resonant frequency of the piezoelectric antenna can drift, and this results in the dampened piezoelectric radiator performance due to the mismatch between RF source' excitation frequency and piezoelectric antenna's resonant frequency. The frequency drift can be detrimental to the operation of the communication system that involves piezoelectric transmitter / receiver as a system component. In embodiments, the piezoelectric antennas may be integrated into a crystal oscillator to lock a drive frequency of the piezoelectric antennas to a resonant frequency of the piezoelectric antennas.

The invention belongs to the field of integrated circuits, and particularly relates to a high-Q-value quick-start crystal oscillator based on an MLP neural network. A neural network is used for replacing a complex phase synchronization hardware circuit in a traditional energy injection technology. Firstly, working state parameters of a crystal oscillator are collected in real time through a state collection module; then mapping the received real-time digital information into a corresponding output instruction through a trained MLP neural network model, and further controlling an energy injection module to inject an energy signal in the same phase as crystal oscillation; along with gradual increase of the oscillation amplitude, when the oscillation amplitude reaches a threshold value, the MLP neural network control model outputs an injection stopping instruction, switches the switch state, and submits the instruction to the negative resistance oscillation circuit to maintain steady-state oscillation and output a stable oscillation signal. According to the invention, the low complexity and high robustness are taken into account while quick starting is realized, and a solution is provided for the application of the high-Q-value crystal oscillator in a low-delay and low-power-consumption scene.

A dual tank LC-tuned Voltage Controller Oscillator (LC VCO) comprising a differential pair of cross-coupled transistors (M1, M2, M3, M4) produces a negative impedance by keeping a lower drain swing and a sufficient gate swing. The gate terminals of first and second transistors M1, M2 and third and fourth transistors M3, M4 are separated through a series of two inductors L1, L2 and two cross-coupled capacitors are connected between the drain and gate terminals of cross-coupled transistors to attenuate the output swing. The VCO tank further comprises two R2R Digital to Analog Converters (DAC) to bias both NMOS and PMOS cross-coupled pairs of transistors, to produce a common mode noise.

The invention discloses a voltage-controlled oscillator and a sub-sampling phase-locked loop, and relates to the technical field of phase-locked loops. The voltage-controlled oscillator comprises two negative resistance transistors and a three-layer coil structure; the three layers of coil structures are respectively a drain coil, a grid coil and a source coil from outside to inside; the gate coil and the drain coil are both of an octagonal structure, and the source coil is of a splayed structure; the drain coil, the source coil and the grid coil are all provided with center taps, the center tap of the source coil is connected with a power voltage module, the center tap of the drain coil is grounded, and the connection point of the center tap of the source coil and the power voltage module and the connection point of the center tap of the drain coil and the ground are located on the same side of the drain coil. And the two negative resistance transistors are positioned on the other side of the drain coil. According to the invention, automatic alignment of second harmonics in a wide frequency range is realized. And meanwhile, an extra chip area is not increased.

Mixer circuitry can include a first pair of transistors coupled to a first tail node and configured to receive a local oscillator signal, a second pair of transistors coupled to a second tail node and configured to receive the local oscillator signal, a first digital-to-analog converter, a second DAC coupled between the first DAC and of the first pair of transistors, and a third DAC coupled between the first DAC and the second pair of transistors. During a first phase, control circuitry can sweep the first DAC to trim a first and / or other odd order local oscillator feedthrough. During a second phase, the control circuitry can sweep the second DAC to trim a second and / or other even order local oscillator feedthrough. During a third phase, the control circuitry can sweep the second and third DACs to reject signals associated with a second harmonic conversion gain of the mixer circuitry.

A frequency multiplier includes an oscillator and a harmonic generator. The oscillator has a resonant cavity and a negative resistance unit. The negative resistance unit includes a feedback capacitor and a parasitic capacitor. The feedback capacitor and the parasitic capacitor collectively provide negative resistance for the resonant cavity. The harmonic generator is configured to generate a harmonic signal based on a fundamental frequency signal taken as input. The oscillator is electrically connected to the harmonic generator, and is configured to receive the harmonic signal, and to output an intrinsic signal with the resonant cavity. A frequency of the intrinsic signal is a multiple of a frequency of the fundamental frequency signal.

A resistance-to-frequency, resistance-to-time converter including a first CFOA having an inverting input X1, a non-inverting input Y1 connected to an internal output Z1, an internal output W1 and an external output V0; a second CFOA having an inverting input X2 connected to resistor R3, a non-inverting input Y2 connected to resistor R2 and the Y1, an internal output Z2 connected to a capacitor C, an internal output W2 and an external output Vtr; a third CFOA having an inverting input X3 connected to a variable resistor RT, a non-inverting input Y3 connected to the Vtr, an internal output Z3 connected to a variable resistor RF, an internal output W3 and an external output V1 connected by a resistor R1 to the X1. Each CFOA is voltage saturated. The V0 is a square wave with period T proportional to RT / RF and a frequency of oscillation f proportional to RF / RT.

The invention discloses an anti-radiation low-phase noise voltage-controlled oscillator based on an SOI (Silicon On Insulator) process, relates to the technical field of oscillators, and is used for solving the technical problem that the existing voltage-controlled oscillator based on the SOI process cannot realize low phase noise and high anti-radiation capability at the same time. The anti-radiation low-phase noise voltage-controlled oscillator based on the SOI technology comprises an energy storage unit and a negative transconductance unit. The energy storage unit forms a resonant cavity through an inductor and a capacitor; the negative transconductance unit is connected with the energy storage unit; the negative transconductance unit at least comprises a first cross-coupled pair and a second cross-coupled pair which are formed by a plurality of transistors; the first cross coupling pair is used for generating negative resistance to compensate the loss of the energy storage unit, and the second cross coupling pair serves as a current switching network; the first cross coupling pair and the second cross coupling pair form a negative resistance characteristic, direct-current energy is converted into alternating-current oscillation energy, loss of the resonant cavity is compensated, and a generated oscillation signal is output from the output node.

The invention discloses a Colpitts voltage-controlled oscillator based on harmonic tuning, which comprises a differential driving module and a differential resonant cavity, and is characterized in that the differential driving module outputs a differential current signal and is used for providing a differential resonant current for the differential resonant cavity; the differential resonant cavity is used for converting an input differential current signal into a differential voltage signal, and the differential resonant cavity inputs the differential voltage signal into the differential driving module and provides a differential driving voltage for the differential driving module; wherein the differential resonant cavity has two differential-mode impedance peaks and one common-mode impedance peak, and the working frequency of the differential-mode impedance peak working at a high frequency band is increased to about two times based on a coupling effect among own inductors and a synergistic effect of frequency tuning and impedance matching; and meanwhile, the frequency corresponding to the common-mode impedance peak is one to three times of the frequency corresponding to the differential-mode impedance peak, so that the phase noise of the oscillator can be better suppressed, and more excellent comprehensive performance is realized under the condition of realizing higher working frequency.

Oscillator circuitry is provided that includes a pair of n-type transistors coupled to a first tail node, a pair of p-type transistors coupled to a second tail node, a first tail coil coupled to the first tail node, and a tunable magnetic coupling circuit magnetically coupled to the first tail coil. The oscillator can further include a load inductor, a load capacitor, a second tail coil coupled to the second tail node and magnetically coupled to the tunable magnetic coupling circuit, and a tunable capacitor having a first terminal coupled to the first tail node and having a second terminal coupled to the second tail node. The tunable magnetic coupling circuit can include a first coupling coil magnetically coupled to the first tail coil, a second coupling coil magnetically coupled to the second tail coil, and a programmable resistor coupled to the first and second coupling coils in a loop.

The invention discloses a tap inductor, a resonant cavity structure, an oscillator structure, a chip and equipment, and belongs to the technical field of electronic communication. The tap inductor comprises an inductor Ld and an inductor Lg; wherein an electric coupling mechanism and a magnetic coupling mechanism exist between the inductor Ld and the inductor Lg; the electric coupling corresponds to voltage enhancement coupling between the inductor Ld and the inductor Lg in the current direction, and the magnetic coupling is mutual inductance coupling between the inductor Ld and the inductor Lg. The resonant cavity structure comprises a drain end resonant branch which is composed of an inductor Ld and a capacitor Cd which are connected in parallel; the gate end resonance branch is composed of an inductor Lg and a capacitor Cg which are connected in parallel; wherein the two branches are symmetrically distributed in a differential form and are respectively connected to a drain electrode and a grid electrode of the active part of the oscillator. According to the tapped induction transformer network provided by the invention, the larger passive gain from the drain end to the grid end in the oscillator is realized; a resonant cavity of a tap inductor based on electric-magnetic coupling solves the problem that a traditional structure cannot achieve higher gain.

To provide a crystal vibrator with a built-in temperature sensor having a new structure that can improve hysteresis of frequency-temperature characteristics of a crystal vibrator piece more than before.SOLUTION: A crystal vibrator 10 comprises a container 13, a recessed part 17, an AT-cut crystal vibrator piece 11 mounted in the container, and a temperature sensor 15 mounted in the recessed part. Two adhesive pads 13a and 13b are provided along a first direction (a) on a circumference portion of the recessed part of the container. The crystal vibrator further comprises a pedestal 23 made of crystals, arranged between the two adhesive pads and the crystal vibrator piece, one end of one surface of which is made to adhere to the two adhesive pads and in which the crystal vibrator piece is made to adhere to the other surface thereof, at two positions along an X-axis of the crystals or at two positions along a Z'-axis of the crystals. The pedestal has the X-axis or the Z'-axis, depending on whether the crystal vibrator piece is made to adhere thereto at the two positions along the X-axis or the piece is made to adhere thereto at the two positions along the Z'-axis, where the crystal vibrator piece is made to adhere to the two adhesive pads in a positional relation in which the axes are in parallel to the first direction.SELECTED DRAWING: Figure 1