403 results about "Voltage-controlled oscillator" patented technology

The invention discloses a low-phase noise ring voltage-controlled oscillator based on multiphase injection locking, relates to the technical field of integrated circuits, and is used for solving the technical problems that an existing injection locking oscillator limits the frequency tuning range and cannot effectively suppress noise. The invention discloses a low-phase noise ring voltage-controlled oscillator based on multiphase injection locking. The low-phase noise ring voltage-controlled oscillator comprises a first ring oscillator unit and a second ring oscillator unit, the n first ring oscillator units are connected in series to form a chain structure; the second ring oscillator unit is provided with a cross coupling inverter complementary injection unit and a tail current source injection unit; a first output end of the chain structure is connected with a second input end of the second ring oscillator unit, and a second output end of the chain structure is connected with a first input end of the second ring oscillator unit; a first signal is injected into a cross-coupling inverter complementary injection unit and a tail current source injection unit, and a second ring oscillator unit receives a second signal output by a chain structure and then outputs a third signal.

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.

The invention discloses a frequency stabilized laser based on a double-fiber interferometer. The frequency stabilized laser comprises a narrow linewidth laser, an acousto-optic frequency shifter, a 1 * 2 fiber splitter I, the double-fiber interferometer, a voltage-controlled oscillator and a control module, the output end of the narrow linewidth laser is connected with the input end of the acousto-optic frequency shifter, and the two input ends are connected with the second output end and the third output end of the control module respectively. The driving input end of the acousto-optic frequency shifter is connected with the output end of the voltage-controlled oscillator, and the output end of the acousto-optic frequency shifter is connected with the input end of the 1 * 2 optical fiber splitter I; one output end of the 1 * 2 optical fiber splitter I outputs a frequency-stabilized laser signal, and the other output end of the 1 * 2 optical fiber splitter I is connected with the input end of the double-optical-fiber interferometer; the output end of the double-fiber interferometer is connected with the input end of the control module; the first output end of the control module is connected with the voltage-controlled oscillator, and the second and third output ends are connected with the narrow linewidth laser. According to the invention, laser signal output with high precision and high frequency stability is realized, and the frequency stability of the laser is three to four orders of magnitude higher than that of a narrow linewidth laser.

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.

According to one embodiment, an electronic device may be provided, the electronic device comprising an RF circuit and a communication processor operatively connected to the RF circuit, wherein the RF circuit comprises at least one reception circuit, at least one transmission circuit, a first VCO, a second VCO, and a signal detection block electrically connected to the first VCO, and the communication processor is configured to control the RF circuit to change the operating frequency of the second VCO on the basis of determining whether a signal output from the first VCO is an abnormal signal. Various other embodiments may be possible.

A clock recovery system for recovering an in-band communication clock in a wireless power transfer system can in include: a phase locked loop; and a bit decision block and a multiplexer that cooperate to selectively provide the error signal to the loop filter responsive to detected bits in the in-band communication bitstream. The phase locked loop can further include: a phase detector that computes an error signal from a difference between an instantaneous peak location and an estimated peak location correlated to a symbol in an in-band communication bitstream; a loop filter that selectively receives the error signal; and a voltage controlled oscillator that adjusts its output frequency responsive to an output of the loop filter.

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.

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.

A system includes a voltage-controlled oscillator (VCO), a first second-order harmonic filter coupled to the VCO, wherein the first second-order harmonic filter includes a first tunable capacitor, and a second second-order harmonic filter coupled to the VCO, wherein the second second-order harmonic filter includes a second tunable capacitor. The system also includes a measurement circuit coupled to the VCO, wherein the measurement circuit is configured to measure a voltage swing of the VCO. The system also includes a control circuit coupled to the measurement circuit, the first tunable capacitor, and the second tunable capacitor.

The present disclosure includes apparatuses and methods related to temperature compensation for voltage-controlled oscillators (VCOs). An example method includes performing a scan of a bias voltage step applied to an auxiliary varactor of a voltage controlled oscillator (VCO) of a phase locked loop (PLL). For each of the plurality of bias voltage steps corresponding to the scan: determining a frequency difference between a reference clock signal of the PLL and a VCO clock; and determining a difference between the determined frequency difference of the corresponding bias voltage step and a different one of the plurality of bias voltage steps. The method may include selecting a particular one of the plurality of bias voltage steps as a target bias voltage for the auxiliary varactor based on the calculated difference.

The application discloses a kind of synchronization methods of multi-channel high-speed digital-analog conversion module, comprising: reference clock source generates reference clock;Trigger controller generates trigger signal, trigger signal is used to inform each DAC board to start the digital quantity transmission of new waveform;Master chip PLL is multiplied to preset operating frequency by reference clock, and the feedback path of master chip PLL is removed to DAC board, and the delay of voltage-controlled oscillator output master chip IO's wiring is consistent and position is close;DAC PLL is multiplied to the sampling clock frequency of DAC by reference clock, and the output phase of DAC PLL can be adjusted, to ensure the timing margin when DAC reads digital quantity;Master chip is triggered under trigger signal, and at preset time, the digital quantity of several waveforms to be converted is sent to DAC by isochronous transmission path, and DAC converts digital quantity into analog waveform, realizes that all DAC completes digital quantity to analog quantity conversion at the same time, and realizes the high-precision synchronous conversion of DAC.

The embodiment of the application provides a voltage-controlled oscillator, an oscillator circuit, a chip and an electronic device, relates to the technical field of communication or radar detection, and can improve the linearity of the voltage-controlled oscillator. The voltage-controlled oscillator comprises a voltage-controlled oscillator resonant cavity, an even harmonic generator circuit and a self-mixing tripler circuit. The voltage-controlled oscillator resonant cavity comprises a voltage change diode array and a first mode switching capacitor. The even harmonic generator circuit comprises a group of cross-coupled tubes, one end of the group of cross-coupled tubes is electrically connected to differential two ends of the voltage-controlled oscillator, and the group of cross-coupled tubes simultaneously serves as an even harmonic generator and is electrically connected to the self-mixing tripler circuit. The self-mixing tripler circuit comprises a differential unit and a resonant cavity, and one end of the self-mixing tripler circuit is electrically connected to the even harmonic generator circuit. The low-frequency voltage-controlled oscillator and the self-mixing tripler circuit realize current multiplexing, the even harmonic generator circuit serves as an even harmonic generator of the self-mixing tripler in addition to serving as negative resistance of the oscillator, and the linearity of the millimeter wave frequency source is improved.

The utility model discloses a Ka wave band frequency source based on a phase-locked loop structure, which comprises a master controller, a crystal oscillator module, a phase-locked loop module and a frequency doubling processing module, and the phase-locked loop module is respectively connected with the master controller, the crystal oscillator module and the frequency doubling processing module. The phase-locked loop module comprises a power supply module, a phase-locked loop main chip, a loop filter module and a locking state indication module, and the phase-locked loop main chip is respectively connected with the power supply module, the loop filter module, the locking state indication module and the main controller; the frequency doubling processing module comprises a low-pass filter, a high-pass filter, a fixed frequency attenuator, a power amplifier, a frequency doubling chip and a band-pass filter which are connected in sequence, and the input end of the low-pass filter is connected with the output end of the voltage-controlled oscillator. The frequency output by the phase-locked loop module is input to the frequency multiplication processing module, and the frequency multiplication processing module carries out harmonic suppression, attenuation, amplification and frequency multiplication processing on the input frequency, so that the output frequency has the advantages of low phase noise, wide frequency band and high stability.

This invention discloses a pilot-type carrier phase recovery circuit and a reverse antenna array system, belonging to the field of 5G millimeter-wave communication. The pilot-type carrier phase recovery circuit includes a digital phase detector, a quadrature mixer, a quadrature voltage-controlled oscillator, a low-pass filter, a high-pass filter, a polyphase filter, a loop filter, a first intermediate frequency amplifier, a second intermediate frequency amplifier, a first shaping circuit, and a second shaping circuit. Applied to a reverse antenna array system, this invention performs carrier phase recovery on the data signal and pilot signal output from the receiver, separating the data signal without spatial phase information and the spatial phase information used for reverse transmission. This invention enables high-order modulation full-duplex communication and real-time tracking of moving targets, featuring high integration, small area, high communication speed, and strong anti-interference capability.

Embodiments of the present disclosure relate to methods and apparatus for voltage controlled oscillators comprising a distributed active transformer core. Embodiments of the present disclosure relate to voltage controlled oscillators comprising a plurality of oscillator cores, magnetically coupled in series.

The invention provides a PLL loop bandwidth adjusting circuit, a control method and a circuit board. The PLL loop bandwidth adjusting circuit comprises a phase frequency detector, a charge sharing filter, a phase-locked loop proportional path module and an adjustable voltage-controlled oscillator. The input end of the phase frequency detector is connected with a reference signal; the first output end of the phase frequency detector is connected with the first input end of the adjustable voltage-controlled oscillator through the charge sharing filter; the second output end of the phase frequency detector is connected with the second input end of the adjustable voltage-controlled oscillator through the phase-locked loop proportional path module; the phase-locked source has the beneficial effects of high flexibility and low power consumption, and is suitable for the technical field of phase-locked sources.

The application provides an equivalent sampling circuit and device, and an equivalent sampling method, and relates to the field of circuits.The equivalent sampling circuit comprises a frequency discriminator, a voltage-controlled oscillator, a first frequency divider, a second frequency divider and a sampling unit; wherein the frequency discriminator is used to obtain a reference signal and a first frequency division signal, compare the frequency and phase of the first frequency division signal and the reference signal respectively, and obtain the frequency difference and phase difference of the first frequency division signal and the reference signal; the voltage-controlled oscillator is used to generate a second oscillation signal based on the frequency difference and the phase difference; the second frequency divider is used to perform integer frequency division on the second oscillation signal by using an integer frequency division coefficient to generate a second frequency division signal; and the sampling unit is used to perform equivalent sampling on a to-be-tested signal based on the second frequency division signal.The equivalent sampling circuit in the application can greatly improve the time delay step of the second frequency division signal, does not increase the circuit cost, and ensures the accuracy of sampling.

A tuning array selection circuit, together with a decoder and a voltage controlled oscillator (VCO), can be employed to overcome some disadvantages of previous methods of phase locked loops. For example, a VCO can include a coarse tuning array and a fine tuning array. A coarse tuning array can be used to tune a VCO to generate a signal within a wide frequency range. A fine tuning array can be used to tune a VCO to generate a signal within a narrow frequency range. In one embodiment, the narrow frequency range is within the wide frequency range. The tuning array selection circuit can coordinate selection of appropriate fine tuning devices and narrow tuning devices to reduce transition jitter and the risk of fail locking of phase locked loops.

The application discloses a double feedback branch current compensation type charge pump circuit, which comprises a core circuit, a double feedback branch and a bias circuit connected in sequence, wherein the input node of the double feedback branch is connected with the core circuit for detecting the potential change of the output voltage, the first output node of the first feedback branch in the double feedback branch is connected with the gate of the bias circuit, the second output node of the second feedback branch is connected with the bias circuit, and the up and down charging and discharging currents are carried out phased current compensation through the bias circuit according to the degree of the output voltage deviating from the center potential. The application solves the mismatching problem of the up and down charging and discharging currents when the output voltage deviates from the center potential through the double feedback branch, can convert the phase error output by the frequency discriminator into the difference between the charging and discharging currents, charges and discharges the loop filter to generate the control voltage of the voltage controlled oscillator, thereby realizing the lower charging and discharging current mismatching in the wider control voltage range, the smaller ripple on the output voltage, and the optimization of the jitter performance of the output clock of the phase-locked loop.

The invention discloses a starting circuit capable of being automatically turned off for a phase-locked loop oscillator, and belongs to the field of integrated circuits. The starting circuit comprises a reference current source and a starting current source; the starting current source enables a voltage-controlled oscillator in the phase-locked loop to start oscillation from an initial state, and mirror image processing is carried out on the working current of the voltage-controlled oscillator; and after the voltage-controlled oscillator reaches the preset oscillation frequency, the reference current source is used for comparison, so that the starting circuit is automatically closed, and the normal working performance of the phase-locked loop is not influenced. The circuit structure provided by the invention can ensure that the voltage-controlled oscillator starts to oscillate from the initial state of the circuit through the starting current source, and after the phase-locked loop starts to work normally, the starting circuit is automatically closed by utilizing comparison of the reference current source without influencing the normal working performance of the phase-locked loop; the problem that the phase-locked loop enters deadlock and cannot be started due to the fact that the alternating-current coupling buffer is interfered by power supply noise in the starting process of the phase-locked loop is solved.

This invention discloses a reconfigurable injection-locked local oscillator system, comprising a voltage-controlled oscillator (VCO), an injection-locked frequency multiplier (ILL), and an injection-locked amplifier (ILA). The first output terminal of the VCO is connected to the first input terminal of the ILL, the second output terminal of the VCO is connected to the second input terminal of the ILL, the first output terminal of the ILL is connected to the first input terminal of the ILL, and the second output terminal of the ILL is connected to the second input terminal of the ILL. The VCO generates a low-frequency fundamental wave, the ILL multiplier performs frequency multiplication on the low-frequency fundamental wave to generate a second or third harmonic wave, and the ILL amplifies the power of the second or third harmonic wave, thereby improving the accuracy of the output millimeter-wave frequency.

The invention provides a butterfly-shaped cross main tail inductor for a voltage-controlled oscillator, relates to the technical field of phase noise optimization of the voltage-controlled oscillator, and aims to realize phase noise optimization of the voltage-controlled oscillator on the premise of not occupying more area. The butterfly-shaped crossed main and tail inductor comprises a main inductor formed by winding a splayed metal wire, a tail inductor formed by winding a splayed metal wire, two metal interlayer through holes, two main inductor ports and two tail inductor ports; the main inductor is used for providing an inductance value required by resonance of the LC voltage-controlled oscillator; the tail inductor is used for filtering noise generated by the tail current source and improving the impedance of a common mode point, so that the overall phase noise performance of the voltage-controlled oscillator is improved; and the metal interlayer through hole, the main inductor port and the tail inductor port are used for providing inductor wiring and circuit interfaces. The voltage-controlled oscillator is simple in structure, phase noise can be reduced without improving the design of the voltage-controlled oscillator, meanwhile, occupied area is reduced, and the voltage-controlled oscillator has very high cost performance.

The invention relates to a W-band low-noise voltage-controlled oscillator based on a transformer resonant cavity and harmonic extraction. The W-band low-noise voltage-controlled oscillator comprises a dual-core in-phase coupled oscillator core, a two-bit switched capacitor bank, a linear variable capacitor bank and an output buffer, the dual-core in-phase coupled oscillator core comprises a transformer resonant cavity and a harmonic extraction network, a fundamental wave oscillation signal is generated in the transformer resonant cavity and is coupled and output to the output buffer, and a high-power second harmonic oscillation signal is generated in the harmonic extraction network and is output as a target oscillation signal; the two-bit switched capacitor bank adopts an HBT switch with excellent high-frequency performance, the tuning range of the oscillator is divided into four sub-bands, and the tuning gain is reduced; the capacitance value of the linearized variable capacitor bank is linearly changed along with the tuning voltage height, and a conversion mechanism of flicker noise is inhibited; and the output buffer realizes load isolation and buffering of the fundamental wave oscillation signal. The voltage-controlled oscillator has low tuning gain and high output power in the W wave band, and excellent phase noise is achieved.

The invention discloses a voltage-controlled oscillator circuit, comprising: a current control circuit module configured to receive an input voltage and generate a control current responsive to the input voltage; the ring oscillator circuit module is connected with the current control circuit module and comprises a multi-stage inverter and a current adjusting unit which are connected in series to form a ring; the current adjusting unit is respectively connected to the current control circuit module and each stage of the multi-stage phase inverter, and is configured to synchronously and symmetrically adjust the pull-up current and the pull-down current of each stage of phase inverter in the multi-stage phase inverter in response to the control current; and the output driving circuit module is connected with an output node of the ring oscillator circuit module so as to shape and drive the oscillation signal generated by the ring oscillator circuit module and output a clock signal with a duty ratio of 50%. The circuit structure is simplified, the chip area is saved, the oscillator is allowed to directly work at the target frequency instead of double frequency, and the overall power consumption is reduced.

The invention provides a phase-locked loop rapid locking circuit structure and a control method thereof, the circuit structure comprises a voltage-controlled oscillator, a frequency divider, a phase discriminator and a rapid locking loop filter, and the rapid locking loop filter comprises a capacitive digital-to-analog conversion module. According to the invention, the capacitive digital-to-analog converter module is adopted, and the control voltage of the voltage-controlled oscillator can be rapidly and accurately set based on the charge sharing principle, so that rapid locking is realized; moreover, the structure multiplexes the capacitor in the loop filter, and does not need an extra area. The method has the advantages of high precision, low power consumption and low cost, and has extremely high application value and potential.

The invention relates to a device and method for evaluating the influence of a power supply noise group on phase noise of a phase-locked loop, and relates to the technical field of phase-locked loops, and the device comprises a sine phase discriminator which detects the phase difference between an external reference signal and a feedback signal of a voltage-controlled oscillator; the input end of the loop filter is connected with the output end of the sine phase discriminator; the input end of the voltage-controlled oscillator is connected with the output end of the loop filter; establishing a phase-locked loop simulation model composed of a sine phase discriminator, a loop filter and a voltage-controlled oscillator; selecting a linear voltage-stabilized power supply series, and calculating a phase noise matrix with power supply noise corresponding to each model; different types of linear voltage-stabilized power supplies are respectively used for supplying power, and actually measured phase noise data corresponding to each type are tested and recorded; power supply noise group distribution is fitted by adopting a power law function, and optimal linear voltage-stabilized power supply model selection under the phase-locked loop architecture is determined. The method has the beneficial effects that the accuracy of predicting the phase noise is improved, the optimal solution is realized, and the model most suitable for the phase-locked loop architecture in the LDO series is selected.

The present disclosure provides a voltage-controlled oscillator structure for a communication circuit. The structure includes a cross-coupling circuit and a transmission line module. The cross-coupling circuit has a first transistor, a first capacitor, a second transistor, and a second capacitor. The transmission line module has a first transmission line unit and a second transmission line unit. A transmission line effect of the cross-coupling circuit is eliminated through the transmission line module, so as to reduce phase noise of a voltage-controlled oscillator, thereby further achieving a purpose of increasing a communication frequency range.

The present invention discloses a clock data recovery circuit, processing chip, and display device, wherein a phase detector compares a reference clock signal and a data signal to generate an initial pulse signal; a pulse width adjustment circuit performs shift register processing on the initial pulse signal to generate a shift pulse signal, and generates a target pulse signal based on a current operating mode selection signal, the shift pulse signal, and a reference clock signal; a charge pump circuit charges and discharges according to the target pulse signal to output a voltage signal; and a voltage-controlled oscillator outputs a reference clock signal based on the voltage signal. Because the clock data recovery circuit includes a pulse width adjustment circuit capable of adjusting the initial pulse signal, and because the circuit adjusts the initial pulse signal based on the reference clock signal, the pulse width of the pulse signal can be adjusted as needed without using additional signals, thereby improving the flexibility of the clock data recovery circuit.