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542 results about "Voltage-controlled oscillator" patented technology

A voltage-controlled oscillator (VCO) is an electronic oscillator whose oscillation frequency is controlled by a voltage input. The applied input voltage determines the instantaneous oscillation frequency. Consequently, a VCO can be used for frequency modulation (FM) or phase modulation (PM) by applying a modulating signal to the control input. A VCO is also an integral part of a phase-locked loop.

Low-phase noise annular voltage-controlled oscillator based on multiphase injection locking

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.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Clock and data recovery circuit without reference clock, use method and integrated circuit

The invention discloses a reference-clock-free clock and data recovery circuit, a use method and an integrated circuit. The circuit comprises a first circuit and a second circuit, the first circuit comprises a voltage-controlled oscillator, the second circuit comprises a comparison module and a frequency capture module, and the comparison module is used for comparing a first clock signal with a high-speed serial data signal, generating a first signal and outputting the first signal to the frequency capture module. The frequency capture module outputs a first control signal, the first control signal is used for adjusting the first oscillation frequency so as to enable the frequency deviation between the first oscillation frequency and the second oscillation frequency to be smaller than a first deviation threshold value, and the second circuit generates a second clock signal and outputs the second clock signal to the first circuit; the first circuit adjusts the voltage-controlled oscillator using a second clock signal such that the frequency offset is less than a second offset threshold. According to the invention, the CDR and PLL functions are fused and an external reference clock is replaced by the CDR recovery clock, so that a clock and data recovery system without an external clock is realized.
Owner:TORUN SEMICONDUCTOR (BEIJING) CO LTD

Radiation hardening numerical control oscillator, clock data recovery circuit and equipment

The invention discloses an anti-radiation hardening digital controlled oscillator, a clock data recovery circuit and equipment, and the digital controlled oscillator is characterized in that an anti-radiation hardening circuit unit is connected between a digital-to-analog converter (DAC) and a voltage-controlled oscillator (VCO), and comprises a voltage copying unit and a multiplexer; the voltage copying unit is used for copying a control voltage signal output by the digital-to-analog converter DAC, generating a copying voltage signal, sending the copying voltage signal to the multiplexer, and switching the output of the multiplexer from the control voltage signal to the copying voltage signal when the digital-to-analog converter DAC is subjected to single-particle bombardment. The DCO type clock data recovery circuit aims at solving the problem that a traditional DCO type clock data recovery circuit is prone to being affected by single particles when running in a radiation environment, single particle function interruption is generated, and consequently a space task fails, and the radiation hardening capacity of the DCO type clock data recovery circuit running in the radiation environment is improved.
Owner:NAT UNIV OF DEFENSE TECH

Fast-locking low-jitter sub-sampling phase-locked loop

The invention discloses a fast-locking low-jitter sub-sampling phase-locked loop structure. The sub-sampling phase-locked loop comprises a sub-sampling Bang-Bang phase discrimination circuit, a self-adaptive variable step size digital filter circuit, a delta sigma digital-to-analog conversion circuit and an oscillator circuit. The sub-sampling Bang-Bang phase discrimination circuit generates a phase discrimination output digital control signal according to an input reference signal and a feedback oscillator signal phase error, the adaptive variable step size digital filter circuit adaptively adjusts a filtering gain according to the phase discrimination output digital control signal, and the output of the filter circuit realizes digital-analog conversion after oversampling modulation. And the output analog signal controls the voltage-controlled oscillator to realize rapid low-jitter phase locking of the output and the reference signal.
Owner:GUILIN UNIV OF ELECTRONIC TECH

Notch filter calibration in LC oscillators for supply noise rejection

Embodiments herein relate to an apparatus and method for calibrating a notch filter which filters a power supply signal for a voltage-controlled oscillator (VCO). In one aspect, a control circuit performs a number of calibration cycles for the filter to determine a value of a calibration code for the filter which minimizes a change in a frequency of the output signal of the VCO due to a change in the voltage of the power supply signal. After each calibration cycle, the calibration code is adjusted based on whether the frequency of the output signal increase or decreases. The calibration cycles can therefore converge on an optimal calibration code which minimizes the change in frequency due to the change in voltage. This minimizes a sensitivity of the VCO to noise in the power supply signal.
Owner:ALTERA CORP

Power supply calibration for voltage controlled oscillators

A clock generation circuit has a voltage-controlled oscillator that includes a first transistor pair coupled in series between a power rail and ground, a replica transistor pair coupled in series between a reference node and ground, a current source having an output coupled to the reference node. The current source is coupled to a control signal that determines amplitude of current flowing through the replica transistor pair. A voltage regulator has an input coupled to the reference node and an output coupled to the power rail. The voltage regulator is configured to maintain the power rail at a voltage level defined by the voltage level of the reference node. Each transistor in the replica transistor pair is collocated on an integrated circuit with and has a same type as a corresponding transistor in the first transistor pair.
Owner:QUALCOMM INC

Low-power-consumption anti-radiation quadrature voltage-controlled oscillator based on SOI (Silicon On Insulator) process

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.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Frequency-locked loop circuit driven by high power supply rejection ratio and low swing and control method thereof

The invention relates to the field of integrated circuit design, and particularly discloses a high power supply rejection ratio and low swing driving frequency-locked loop circuit and a control method thereof, a low dropout regulator is adopted to provide independent power supply lower than a main power supply voltage for a voltage-controlled oscillator, and double optimization effects are achieved. The clean power supply provided by the low dropout linear regulator effectively isolates the interference of the main power supply noise to the voltage-controlled oscillator, so that the power supply noise suppression capability of the circuit is remarkably enhanced, and the jitter of an output clock signal is greatly reduced; and on the other hand, the working voltage of the voltage-controlled oscillator is allowed and dynamically regulated and controlled to be optimized in a low range meeting the performance according to the real-time load of the voltage-controlled oscillator, so that on-demand power supply is realized, the dynamic power consumption of the voltage-controlled oscillator is reduced to the maximum extent while the output quality is not reduced, and the energy efficiency of the whole circuit under different load conditions is improved.
Owner:SHANGHAI HYNITRON TECH CO LTD

Integrated photonics millimeter wave (MMW) radar communication system based on analog phase modulation scheme

An integrated photonics millimeter wave (MMW) radar communication system based on analog phase modulation scheme includes an integrated photonics MMW radar communication signal transmitter, a radar receiver, and a communication receiver. The transmitter includes a radar communication signal analog phase modulation module, an optical frequency comb (OFC) module, an electro-optic modulator (EOM), an optical shaping filter, an optical power divider, a photoelectric detector, an electric power amplifier, and a transmitting antenna that are cascaded sequentially. The radar receiver includes a radar receiving antenna, an electric low-noise amplifier (LNA), an optical phase modulator, an optical bandpass filter (BPF), a low-speed photoelectric detector, an electric low-pass filter, and a low-speed oscilloscope that are cascaded sequentially. In the communication receiver, a communication receiving antenna is sequentially cascaded with an electric LNA, a frequency mixer, and an oscilloscope, and a voltage-controlled oscillator is cascaded with a frequency multiplier and then connected to the frequency mixer.
Owner:SOUTHWEST JIAOTONG UNIV

Voltage-controlled oscillator, chip and electronic equipment

The embodiment of the invention provides a voltage-controlled oscillator, an oscillator circuit, a chip and electronic equipment, 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 frequency tripler circuit. The voltage-controlled oscillator resonant cavity comprises a voltage transformation diode array and a first-stage mode switching capacitor. The even harmonic generator circuit comprises a group of cross coupling tubes, one end of each cross coupling tube is electrically connected to the two differential ends of the voltage-controlled oscillator, and the even harmonic generator circuit serves as an even harmonic generator and is electrically connected to the self-mixing frequency tripler circuit. The self-mixing frequency tripler circuit comprises a differential unit and a resonant cavity, and one end of the self-mixing frequency tripler circuit is electrically connected to the even harmonic generator circuit. The low-frequency voltage-controlled oscillator and the self-mixing frequency tripler circuit achieve current multiplexing, the even harmonic generator circuit serves as a negative resistor of the oscillator and also serves as an even harmonic generator of the self-mixing frequency tripler, and the linearity of the millimeter wave frequency source is improved.
Owner:SOUTH CHINA UNIV OF TECH

Frequency stabilized laser based on double-fiber interferometer

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.
Owner:THE 34TH RES INST OF CHINA ELECTRONICS TECH CORP

Multi-gigabit per second frequency-shift keying (FSK) transceiver

ActiveUS20250184194A1Angle modulationFrequency-modulated carrier systemsLow noiseTransceiver
A 4 frequency-shift keying (4FSK) transceiver is provided. The 4FSK transceiver includes both a 4FSK transmitter and a 4FSK receiver. The 4FSK transmitter includes a voltage-controlled oscillator (VCO) and two data links coupled to the VCO for delivering two parallel streams of input data bits to the VCO. For each pair of parallel input data bits received from the two data links, the VCO outputs a modulated signal having one of four operating frequencies via 4FSK modulation. Separately, the 4FSK receiver includes a power divider, for dividing the multi-frequency modulated signal into two paths of two binary bit streams, and a pair of low-noise amplifiers (LNAs) separately coupled to the two paths and configured as a pair of band-pass filters for filtering two different subsets of the four operating frequencies from the two binary bit streams into two filtered binary bit streams.
Owner:RGT UNIV OF CALIFORNIA

Low-noise voltage-controlled oscillator circuit

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.
Owner:HOPE MICROELECTRONICS CO LTD +1

Frequency calibration method and system based on jump search, medium and equipment

The invention discloses a method, a system, a medium and equipment for frequency calibration based on jump search. The method comprises the following steps: acquiring the output clock frequency of a voltage control oscillator; performing frequency detection on the clock frequency, judging whether the current frequency is greater than the target frequency, less than the target frequency or within the target frequency range, and outputting a corresponding indication signal; according to the indication signal output by the frequency detection module, the step length of the calculation logic is adjusted, and the calibration result is fed back to the voltage control oscillator, and the problem that the calibration time of the VCO in large-range frequency calibration is too long is solved.
Owner:HEFEI UNIV OF TECH

Method for reducing VCO coupling and electronic device supporting same

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.
Owner:SAMSUNG ELECTRONICS CO LTD

Four-core F23 type millimeter wave voltage-controlled oscillator based on intra-core common mode technology

The invention discloses a four-core F23 type millimeter wave voltage-controlled oscillator based on an intra-core common mode technology. The voltage-controlled oscillator comprises a three-coil coupling four-core class-F inductor and four voltage-controlled oscillator cores. The three-coil coupling quad-core class-F inductor comprises eight differential ports, four ports are connected with a grid electrode of a core negative resistance tube of the voltage-controlled oscillator, and the other four ports are connected with a drain electrode of the core negative resistance tube of the voltage-controlled oscillator. The negative resistance tubes of the four voltage-controlled oscillator cores are formed by NMOS tubes and PMOS tubes in an alternating mode. The voltage-controlled oscillator is in an F-type working state for differential mode current so as to improve phase noise; noise filtering is performed on the common-mode current through an intra-core natural common-mode path. According to the invention, millimeter wave frequency output with low phase noise can be realized in a compact layout.
Owner:SOUTH CHINA UNIV OF TECH

Temperature-compensation voltage-controlled oscillation circuit for self-inspection of microwave channel

The utility model discloses a temperature-compensation voltage-controlled oscillation circuit for microwave channel self-inspection, and the circuit comprises a self-inspection power supply circuit which is used for outputting stable DC power supply voltage; the temperature compensation circuit is used for outputting tuning voltage Vt; a voltage-controlled oscillator, the voltage tuning end of which is connected with the tuning voltage Vt of the partial voltage output end of the temperature compensation circuit, and which is used for outputting a microwave continuous wave signal; the microwave modulation circuit is used for receiving the microwave continuous wave signal output by the voltage-controlled oscillator and generating a microwave pulse signal; the microwave switch receives the microwave pulse signal generated by the microwave modulation circuit through a power divider and is used for selecting a microwave pulse self-checking signal; and the feed-in coupling circuit is used for feeding the microwave pulse self-checking signal into the microwave channel. According to the utility model, the voltage-controlled oscillator is enabled to maintain stable frequency output at different temperatures, and the consistency and repeatability of microwave channel detection are improved.
Owner:NANJING AEROSPACE IND TECH CO LTD

Timing recovery for in-band communication in inductive power transfer systems

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.
Owner:APPLE INC

Voltage-controlled oscillator (LC VCO) and method of operation thereof

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.
Owner:INDIAN INST OF TECH ROPAR

Voltage-controlled oscillator and sub-sampling phase-locked loop

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.
Owner:XI AN JIAOTONG UNIV

Anti-radiation low-phase noise voltage-controlled oscillator based on SOI process

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.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Voltage-controlled oscillator and wireless sensor

The invention relates to the technical field of communication, and provides a voltage-controlled oscillator, a wireless sensor and a voltage-controlled oscillator, the voltage-controlled oscillator comprises an oscillation module, the oscillation module comprises a temperature change compensation sub-module and an oscillation sub-module, and the temperature change compensation sub-module is connected with the oscillation sub-module; the temperature change compensation sub-module is used for adjusting the voltage input to the oscillation sub-module based on temperature feedback; and the oscillation sub-module is used for generating a signal with a target frequency based on a target analog signal and a corresponding relation between the target analog signal and a preset analog signal amplitude and frequency. The temperature change compensation sub-module is introduced into the voltage-controlled oscillator, and the temperature change compensation sub-module compensates the temperature drift by using the frequency temperature characteristics of the inductance-capacitance voltage-controlled oscillator and temperature feedback, that is, the voltage input to the oscillation sub-module is adjusted based on the temperature feedback, and the temperature compensation can be realized without introducing extra power consumption.
Owner:BEIJING TASSON SCI & TECH CO LTD

Colpitts voltage-controlled oscillator based on harmonic tuning

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.
Owner:PURPLE MOUNTAIN LAB

Phase noise reduction for voltage-controlled oscillator using harmonic filter

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.
Owner:QUALCOMM INC

Temperature compensation for voltage-controlled oscillators

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.
Owner:MICRON TECHNOLOGY INC

Frequency locking method, phase-locked loop circuit and transceiver

The invention discloses a frequency locking method, a phase-locked loop circuit and a transceiver. If the current frequency of the transceiver is located in the first frequency interval and the target frequency of the transceiver is located in the second frequency interval, switching the voltage-controlled oscillator of the transceiver to a second voltage-controlled oscillator, and outputting the target frequency through the second voltage-controlled oscillator, wherein the second frequency interval is the frequency interval of the first voltage-controlled oscillator and the second voltage-controlled oscillator. Therefore, due to the fact that the second frequency interval is the common frequency interval of the first voltage-controlled oscillator and the second voltage-controlled oscillator, when the current frequency of the transceiver and the target frequency of the transceiver are in different frequency intervals, switching of the voltage-controlled oscillators can be achieved through the common frequency interval. Therefore, the switching of the voltage-controlled oscillator is realized through the transceiver, and compared with the related technology, the switching of the voltage-controlled oscillator by using an external switching circuit is avoided, so that the frequency locking time efficiency is improved.
Owner:HYTERA COMM CORP

A synchronization method for a multi-channel high-speed digital-to-analog conversion module

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.
Owner:HANGZHOU LOGIC BIT TECHNOLOGY CO LTD

A voltage-controlled oscillator, chip and electronic device

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.
Owner:SOUTH CHINA UNIV OF TECH

Ka-band frequency source based on phase-locked loop structure

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.
Owner:CHENGDU XUSITE TECH CO LTD

A pilot carrier phase recovery circuit, a reverse antenna array system

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.
Owner:SOUTHEAST UNIV