56results about How to "Large frequency adjustment range" patented technology

The invention discloses a double-phase-locked loop circuit and a control method thereof. The double-phase-locked loop circuit comprises a phase / frequency detector, a charge pump, a frequency adjustment circuit and an N frequency divider. The frequency adjustment circuit comprises a coarse adjustment circuit, a fine adjustment circuit and a current-controlled oscillator, wherein the coarse adjustment circuit is used for coarse adjustment of frequency of output signals of phase-locked loops till approaching a target frequency; the fine adjustment circuit is used for fine adjustment of the frequency of the output signals of the phase-locked loops till the target frequency; and the current-controlled oscillator is coupled with the coarse adjustment circuit and the fine adjustment circuit and used for producing the output signals of the phase-locked loops, wherein the frequency of the output signals is the target frequency. The double-phase-locked loop circuit can effectively achieve the purpose of expanding the frequency adjustment range under the situation of keeping the loop bandwidth of the phase-locked loops smaller, realize the on-chip integration and further reduce the cost and the design complexity of the circuit.

The invention discloses an optimizing method of a self-correcting frequency synthesizer capable of optimizing properties of a voltage-controlled oscillator. The method comprises the following steps that: when a chip is electrified or a channel is changed each time, a frequency self-correcting loop in a synthesizer self-correcting circuit is started firstly, and a frequency sub-wave band code necessary for the voltage-controlled oscillator is searched; secondly a current self-correcting loop in the synthesizer self-correcting circuit is started, and a current sub-wave band code that an output amplitude of the voltage-controlled oscillator achieves an appointed amplitude is searched, so that the voltage-controlled oscillator works in a minimum power consumption, a good phase noise property is obtained, and at the same time the properties of the voltage-controlled oscillator are not changed when process deviation and temperature change occur; after the accomplishment of frequency correction and current correction is judged by a state machine, a synthesizer enters into the frequency self-locking process of a phase-locked loop; and the optimization and correction process is ended. The invention further discloses the self-correcting frequency synthesizer capable of optimizing the properties of the voltage-controlled oscillator. A wider frequency adjustment range can be obtained, and good local oscillator spectrum purity is obtained through small power consumption; and the optimizing method is suitable for the self-correcting frequency synthesizer of a transceiver with low power consumption, multiple modes and multi-band frequency.

The invention relates to a magnetic device capable of performing facial beautifying and wrinkle removing on a human body and a beautifying method thereof. The magnetic device is composed of an AC filtering circuit, a rectifying and DC filtering circuit, a power factor adjusting and boosting circuit, a startup slow starting circuit, a high-voltage energy storage circuit, an energy-storage capacitor discharging circuit, a safety protection discharging circuit, an auxiliary power supply module, a computer control module and an adjustment display module. The beautifying method comprises the steps that a central part of an inductance coil is placed at the part which needs to be beautified, the inductance coil keeps a small distance away from the skin or is slightly contacted with the skin, or a piece of soft tissue paper is arranged between the inductance coil and the part to be beautified; the output frequency of the inductance coil is controlled to be between 30Hz and 300Hz by the computer control module; the output magnetic intensity of the inductance coil is controlled and adjusted by the computer control module so as to set the stimulation intensity which gives rise to contraction of subcutaneous muscles; the action time is set to be between 0.4s and 3.0s, the interval time is 1.0s-3.0s, the beautifying time is 15-30min for one time, beautifying is performed once a day, and 10 times form a course of treatment.

The invention belongs to the technical field of structure vibration control, particularly relating to a tuned mass damper frequency adjusting device and an implementing method thereof. The tuned mass damper frequency adjusting device comprises a bottom plate of a tuned mass damper, a mass block above the bottom plate and a linear movement-rotary movement transformation device, wherein the bottom plate is connected with the mass block through an elastic element; the linear movement-rotary movement transformation device is mounted between the mass block of the tuned mass damper and the bottom plate and comprises a transmission mechanism with racks and gears or a ball screw transmission mechanism; linear reciprocating movement of the mass block relative to the bottom plate is transformed into rotary movement of a rotating shaft by the linear movement-rotary movement transformation device; and a flywheel is fixedly mounted on the rotating shaft of the linear movement-rotary movement transformation device. The invention further provides a method for adjusting frequency by using the tuned mass damper frequency adjusting device. Frequency adjusting numerical values can be set accurately, the frequency is adjusted continuously and accurately, and the adjustment range is large.

The invention relates to frequency selection surfaces, in particular to an interelement strong coupling ultra-wide range-adjustable active frequency selection surface. A variable capacitance diode is directly loaded with bias voltage to change the capacitance value of the variable capacitance diode, and meanwhile interelement strong coupling is utilized for achieving moving of the whole structure in a resonance frequency ultra-wide range. A dielectric slab, metal layers, the variable capacitance diode and an inductor are arranged. The metal layers, the variable capacitance diode and the inductor are arranged on the front surface of the dielectric slab, the metal layers are vertical strip-shaped metal layers, the vertical strip-shaped metal layers are loaded with two horizontal strip-shaped metal layers with different lengths in the horizontal direction, and the distance between the vertical strip-shaped metal layers and the two horizontal strip-shaped metal layers with the different lengths is half of the length of the long strip-shaped metal layer in the two horizontal strip-shaped metal layers with the different lengths. The two horizontal strip-shaped metal layers with the different lengths are connected through the variable capacitance diode, the vertical strip-shaped metal layers are connected through the inductor, and the vertical strip-shaped metal layers are in seamless connection with the horizontal strip-shaped metal layers.

The invention discloses a frequency-adjustable broadband dynamic vibration absorber and a vibration absorbing method thereof. The vibration absorber comprises a base, a threaded rod perpendicularly installed on the base, a fixed vibration absorbing unit, at least one set of movable vibration absorbing units, nuts and a sliding metal plate; the fixed vibration absorbing unit comprises a fixed mass block and a fixed rubber block which are in vulcanization connection; each set of movable vibration absorbing unit comprises a movable mass block and a movable rubber block placed below the movable mass block; a rubber damping plate is arranged on the upper surface of the movable mass block located on the uppermost portion; the nuts are installed on the threaded rod through threads so that the all the rubber blocks and the all the mass blocks can be fixedly installed on the base in the axial direction; and the sliding metal plate is installed on the threaded rod in a sliding manner through a sleeve. The frequency-adjustable broadband dynamic vibration absorber is suitable for solving the abnormal vibration problem of a system or parts and is also suitable for the problem verification work in the vibration diagnosis process, the using range of the vibration absorber is widened, and the work efficiency is improved.

The invention, which belongs to an electronic circuit, more particularly relates to a circuit for detecting a differential capacitor. The invention relates to an all-digital detection apparatus of a differential capacitor. The apparatus comprises a digital controller (1), a digit programmable clock generator (2), a digit programmable waveform generator (3), a charge amplifier (4), a amplificationmultiple programmable instrument amplifier (5), a binary channel synchronization analog-to-digital converter (6). According to the invention, the digital controller is utilized to carry out programming control on clock source provided by the programmable clock generator, so that all output signal frequencies of the programmable waveform generator can be adjusted flexibly according to demands and a frequency adjusting range is large; An amplification factor G of the instrument amplifier is programmablly controlled by the digital controller; when a delta C is small, a delta C detection for a small signal has a high resolution by increasing the G value; when the delta C is large, the delta C detection for a large signal has a large detection range by reducing the G value. The control of the digital controller to all detection links of the differential capacitor is realized by programming, and links of bandpass frequency selection filtering, frequency mixing demodulation, lowpass filtering and the like are completed by software codes; besides, the hardware structure is concise and the flexibility of adjustment is good.

The invention provides a voltage controlled oscillator circuit, which consists of at least three stages of total difference unit circuits which are cascaded mutually and are completely same. The circuit has the advantages that: 1, the circuit is a CMOS voltage controlled oscillator circuit which has simple structure, high reliability, wide frequency regulating range, and can operate normally under extremely low power supply voltage; 2, the circuit can select a cascade mode of three-stage and above three-stage total difference units which are completely same; 3, source electrodes of positive feedback active load are directly earthed for improving one pass gain of the total difference units, thereby ensuring that the oscillator circuit can normally start oscillation under any condition; 4, a voltage clamping circuit plays a role of stabilizing amplitude of an output signal of the oscillator; and 5, when control voltage controls current in a tail current source of the difference unit to generate variation through certain V-I converting circuit, the oscillator circuit can generate output waveforms with different frequencies along with the magnitude of the tail current, as long as the current in the tail current source is invariable, the frequency of the output waveform of the oscillator circuit can be invariable.

The invention relates to a high-voltage large-power frequency conversion adjustable constant voltage source which comprises a signal generator and N signal processing circuits, wherein power sources for inner components of any two signal processing circuits are not grounded; each signal processing circuit is composed of a digital isolation switching circuit and a power amplifier module; a signal generated by the signal generator is synchronously output to all the signal processing circuits; after the signal is firstly processed by the digital isolation switching circuits of all the signal processing circuit, N high-precision isolated low-voltage alternate current signals are output, wherein N is an integer which is not less than 1; all the low-voltage alternating current signals are the same in amplitude, frequency and phase, and the amplitude and frequency of all the low-voltage alternating current signal can be synchronously adjusted; and all the low-voltage alternating current signals are output to the corresponding power amplifier modules treatment be amplified; and output ends of N power amplifier modules are sequentially connected in series so as to be utilized as the total output of the constant voltage source. The constant voltage source provided by the invention has the advantages that the output voltage and power accuracy is high, and the amplitude regulating range is large.

The invention discloses a multiplexing delay unit circuit, and aims to implement a delay unit circuit with multiplexing function, implement a loop oscillator of different delay unit stages with as low design overhead as possible and acquire multiple oscillator gains. The invention adopts the technical scheme that: the signal input end of a delay unit is connected with an analog switch circuit; and the analog switch circuit consists of a first analog switch K1 and a second analog switch K2, wherein the K1 is connected with a first input signal IN1 under the control of a first control signal C1, the K2 is connected with a second input signal IN2 under the control of a second control signal C2, and the other ends of the K1 and the K2 are connected with the signal input end of the delay unit. The multiplexing delay unit circuit can receive two paths of input; and an oscillator consisting of the multiplexing delay unit circuit can provide multiple gains, and the area and the power consumption overhead of the oscillator are greatly reduced compared with a conventional variable gain oscillator.

The invention discloses a CMOS low-gain wide-tuning-range fully integrated Ka-band millimeter wave quadrature voltage-controlled oscillator. A MOS variable capacitor tube array directly controlled by high and low levels is added into an oscillator resonant cavity to switch access capacitance so as to achieve multi-subband tuning for obtaining low-tuning gain, a wide regulating range, and good phase noise performance. In addition, a coplanar waveguide linear inductor used in the voltage-controlled oscillator has a high quality factor in order to achieve better phase noise performance. A circuit directly outputs a differential orthogonal signal with a high orthogonal precision (less than 1 degree). The phase noise of the voltage-controlled oscillator may reach -107.3dBc / Hz and -129.6dBc / Hz at the frequency offset 1MHz and 10MHz at the center frequency 30GHz, respectively. The voltage-controlled oscillator has total power consumption of 80mW, and can be used as a local oscillation signal source in a Ka-band wireless communication system or a voltage-controlled oscillator in a frequency synthesizer.

The invention discloses a frequency synchronization passive mode-locked fiber laser and a method for realizing frequency synchronization. The frequency synchronization passive mode-locked fiber lasercomprises a passive mode-locked fiber laser body, a frequency locking device and an external signal source. The passive mode-locked fiber laser body comprises a guide rail with a stepping motor, piezoelectric ceramic and a resonant cavity. The frequency locking device comprises a photoelectric detector, a filter, a frequency mixer and a servo system which are electrically connected in sequence. The frequency locking device converts an optical signal output by the passive mode-locked fiber laser into an electric signal, and then the electric signal passes through the filter and the frequency mixer to obtain a differential signal; and the differential signal is processed by the servo system and then fed back to the piezoelectric ceramic, and the cavity length of the passive mode-locked fiberlaser is adjusted through the piezoelectric ceramic, so that the repetition frequency of the passive mode-locked fiber laser is synchronized with an external signal source. The frequency synchronization passive mode-locked fiber laser is simple and compact in structure, large in synchronous frequency adjustable range and suitable for the fields of precision machining, frequency calibration, coldatoms and the like.

The invention relates to the technical field of medical equipment, in particular to a transcranial magnetic stimulation system which is characterized in that charge of an energy storage capacitor in a main motor box is quickly released, pulse current is introduced into a stimulation coil placed above the head, and a pulse magnetic field is generated around the stimulation coil; the magnetic lines of force noninvasively penetrate through the skin and the skull to the cranial nerve with small resistance, a conductible induction current is generated in the skull so as to stimulate the corresponding cranial nerve unit, and the transcranial magnetic stimulation system is simple and convenient to use, does not directly contact the human body, and can avoid cross infection caused by contact with the skin; the frequency adjusting range is large, single stimulation, programmed repeated stimulation and TBS pulse string stimulation can be achieved, the stimulation frequency, the stimulation intensity, the stimulation time and the intermittent time can be changed in a programmable mode, and bidirectional adjustment of nerve excitability is achieved through various stimulation modes; a friendly human-computer interaction interface is provided, medical record management and electronic prescriptions are built in, the system can be used in cooperation with electroencephalogram, and the cooling function of electric liquid absorption and electric liquid drainage is achieved.

The invention provides a linear vibration motor. The linear vibration motor comprises a base vibration unit with an accommodating space, an elastic part for suspending the vibration unit in the accommodating space and a coil for driving the vibration unit to vibrate; the elastic part is located on one side of the vibration direction of the vibration unit, and the coil and the vibration unit are opposite to each other and are arranged at intervals; the elastic part comprises a ring-shaped main body defined by elastic arms, a first fixed arm which extends from two opposite elastic arms of the main body and is fixed on the base, a second fixed arm extends from the other two opposite elastic arms of the main body and is fixed to the vibration unit, a reinforcing rib which extends from one of the elastic arms to the other elastic arm which is opposite to the elastic arm and is connected with the elastic arm, and damping parts which are at least attached to the local positions of the elasticarms. Compared with the related art, the linear vibration motor disclosed by the invention is high in vibration performance and long in service life.

Provided is a linear wide-range numerical control oscillator applied to an FPGA. The kernel portion of the numerical control oscillator is an annular oscillator body. Output frequency of the oscillator body can be selected according to a frequency selection control word. By means of the configurable characteristic of the FPGA, center output frequency of the numerical control oscillator can be flexibly changed, and accordingly the output frequency of the numerical control oscillator can be continuously and linearly adjusted in a wide range.

The invention discloses a driving circuit system of an ultrasonic transducer and a self-adaptive frequency modulation method, and the driving circuit system is used for adjusting the working driving frequency of the ultrasonic transducer. Comprising a microcontroller processing unit, a driving signal enhancement circuit, a push-pull output driving circuit, a high-frequency transformer, an ultrasonic transducer impedance matching circuit, a push-pull output driving current sampling circuit, a high-frequency transformer output voltage sampling circuit and a power supply circuit. The self-adaptive frequency modulation method comprises the following steps: the microcontroller processing unit searches the resonant working frequency of the ultrasonic transducer in the working environment in an initial state through the driving circuit; in the working state, the ultrasonic transducer is adjusted to the resonant frequency in a self-adaptive mode. According to the invention, the self-adaptive dynamic frequency adjustment of the ultrasonic transducer is realized, and manual tuning is not needed; meanwhile, as the frequency range is F0 + / -FC, the frequency adjusting range is wide, and in addition, the hardware technology difficulty is small, the number of components is small, and the cost is low.

The invention discloses a variety of power wave output systems, including a control chip U1, a control chip U2, a frequency band adjustment circuit, a frequency adjustment circuit and an amplitude adjustment circuit. The control chip U1 is respectively connected to a duty cycle adjustment circuit, a waveform selection circuit, and a frequency band adjustment circuit The adjustment circuit, the frequency adjustment circuit, the power supply and the amplitude adjustment circuit, the amplitude adjustment circuit is also connected to the control chip U2, and the control chip U2 is also connected to the power supply, the amplitude attenuation circuit and the signal output terminal respectively. The system of the invention uses the chip ICL8038 as the core device, which can output square waves, triangle waves and sine waves at the same time, has a large frequency adjustment range, small waveform distortion, strong practicability, simple circuit structure and low cost, and is very suitable for popularization and use.

The invention discloses a voltage-controlled tuning frequency selection network, and the network comprises a power supply filter circuit, an LC resonance circuit, an access capacitor, a feedback circuit and three ports P1, P2 and P3. The LC resonance circuit adopts a variable capacitance diode Cv, an inductor L, a capacitor Cs and a capacitor C3, which are all connected in series to form an LC resonance loop, so that a function of selecting signal frequency is realized. A controllable voltage source is connected with the two ends of the variable capacitance diode through the power supply filter circuit, wherein the capacitance value of the variable capacitance diode can be conveniently changed, and the signal frequency selection intellectualization is achieved. The feedback circuit is composed of a capacitor C1 and a capacitor C2 and connects a part of output signals of the active device to the input port so as to form positive feedback oscillation. An access capacitor Cx is connectedbetween the LC resonance circuit and the feedback circuit. Compared with the prior art, the LC resonance circuit has the advantages that the value of Cx is small, so that large capacitive reactance isshown on a radio frequency signal, only a small part of the radio frequency signal of the LC resonance circuit enters an active device, the influence of interpolar capacitance of the active device ona resonant network can be obviously reduced, and the frequency stability is improved.

The invention provides an adjustable dynamic vibration absorber and an adjusting method of the dynamic vibration absorber. The adjustable dynamic vibration absorber and the adjusting method can be used for adjusting the vibration absorber during vibration problem vibration isolation in the automobile NVH (Noise Vibration and Harshness) performance development process. The adjustable dynamic vibration absorber is composed of a basic vibration absorber and a mass block detachably installed on the basic vibration absorber. The specific adjusting method comprises the following steps that A, the system modality of an automobile part to be adjusted is measured under the boundary condition of a whole automobile; B, a proper mass block is selected and fixed to the basic vibration absorber, so that the vibration absorption angular frequency of the adjustable dynamic vibration absorber is equal to the modal frequency of the to-be-adjusted automobile part; C, the base and the support are used for fixing the basic vibration absorber to a to-be-adjusted automobile part, experimental optimization is conducted on the vibration absorption angular frequency and the installation position of the adjustable dynamic vibration absorber, finally, the vibration absorption angular frequency and the installation position of the adjustable dynamic vibration absorber are determined, and parameters of the final engineering vibration absorber are obtained; and D, the adjustable dynamic vibration absorber is disassembled for subsequent adjustment and use.

The invention relates to a non-impact net shaking device. The non-impact net shaking device comprises a box body, wherein the box body is fixed on a base plate, a transmission mechanism, an amplitude regulation mechanism, a connection mechanism, a lubrication system and a sliding rail device are mounted on the box body, eccentric weight balance wheels are mounted on the sliding rail device, the transmission mechanism comprises a decelerator, a main transmission shaft, a parallel shaft coupling, main transmission shafts of the eccentric weight balance wheels, and driven transmission shafts of eccentric balance wheels, the decelerator is mounted on a decelerator bracket, the eccentric weight balance wheels are mounted on the main transmission shafts of the eccentric weight balance wheels and the driven transmission shafts of the eccentric balance wheels, the decelerator is connected with a hollow shaft frequency conversion brake motor, the amplitude regulation mechanism is connected with an amplitude regulation servomotor, and a control system is mounted outside the box body. The non-impact net shaking device has the advantages that the frequency regulating range is wide, the amplitude is smooth, the paper evenness can be improved, and at the same time, the failure rate is low when the non-impact net shaking device is used.

The invention relates to a magnetic device capable of performing facial beautifying and wrinkle removing on a human body and a beautifying method thereof. The magnetic device is composed of an AC filtering circuit, a rectifying and DC filtering circuit, a power factor adjusting and boosting circuit, a startup slow starting circuit, a high-voltage energy storage circuit, an energy-storage capacitor discharging circuit, a safety protection discharging circuit, an auxiliary power supply module, a computer control module and an adjustment display module. The beautifying method comprises the steps that a central part of an inductance coil is placed at the part which needs to be beautified, the inductance coil keeps a small distance away from the skin or is slightly contacted with the skin, or a piece of soft tissue paper is arranged between the inductance coil and the part to be beautified; the output frequency of the inductance coil is controlled to be between 30Hz and 300Hz by the computer control module; the output magnetic intensity of the inductance coil is controlled and adjusted by the computer control module so as to set the stimulation intensity which gives rise to contraction of subcutaneous muscles; the action time is set to be between 0.4s and 3.0s, the interval time is 1.0s-3.0s, the beautifying time is 15-30min for one time, beautifying is performed once a day, and 10 times form a course of treatment.

The invention relates to a high-voltage large-power frequency conversion adjustable constant voltage source which comprises a signal generator and N signal processing circuits, wherein power sources for inner components of any two signal processing circuits are not grounded; each signal processing circuit is composed of a digital isolation switching circuit and a power amplifier module; a signal generated by the signal generator is synchronously output to all the signal processing circuits; after the signal is firstly processed by the digital isolation switching circuits of all the signal processing circuit, N high-precision isolated low-voltage alternate current signals are output, wherein N is an integer which is not less than 1; all the low-voltage alternating current signals are the same in amplitude, frequency and phase, and the amplitude and frequency of all the low-voltage alternating current signal can be synchronously adjusted; and all the low-voltage alternating current signals are output to the corresponding power amplifier modules treatment be amplified; and output ends of N power amplifier modules are sequentially connected in series so as to be utilized as the total output of the constant voltage source. The constant voltage source provided by the invention has the advantages that the output voltage and power accuracy is high, and the amplitude regulating range is large.

The invention discloses a frequency-adjustable broadband dynamic vibration absorber and a vibration absorbing method thereof. The vibration absorber comprises a base, a threaded rod perpendicularly installed on the base, a fixed vibration absorbing unit, at least one set of movable vibration absorbing units, nuts and a sliding metal plate; the fixed vibration absorbing unit comprises a fixed mass block and a fixed rubber block which are in vulcanization connection; each set of movable vibration absorbing unit comprises a movable mass block and a movable rubber block placed below the movable mass block; a rubber damping plate is arranged on the upper surface of the movable mass block located on the uppermost portion; the nuts are installed on the threaded rod through threads so that the all the rubber blocks and the all the mass blocks can be fixedly installed on the base in the axial direction; and the sliding metal plate is installed on the threaded rod in a sliding manner through a sleeve. The frequency-adjustable broadband dynamic vibration absorber is suitable for solving the abnormal vibration problem of a system or parts and is also suitable for the problem verification work in the vibration diagnosis process, the using range of the vibration absorber is widened, and the work efficiency is improved.

The invention relates to a high-power microwave source device in the field of high-power microwave technology, in particular to a coaxial double annular cathode on-line adjusting device applied in RBWO, comprising a cathode rod, an outer cathode head, an inner cathode head, four radial rotary transmission rods, four axial rotary transmission rods, four axial horizontal transmission rods, four connecting pins, four radial adjustment bevel gears, four axial adjustment bevel gears and four servo motors. The whole structure is rotationally symmetrical about the central axis. The invention overcomes the complexity of frequency tuning RBWO regulation mode, By adjusting the extension and retraction of the inner and outer cathodes, the wide frequency spacing across X and Ka bands can be fine-tuned, and the dual-band output can be realized simultaneously. It is of great significance for the design of this type of devices.

The invention discloses a double-wire double-arc digital submerged arc welding power supply, which includes a power supply module and a welding car, and a primary rectification module, a primary inverter module, a transformer module, and a secondary rectification module are sequentially connected between the power supply module and the welding car And the quadratic inverter model is fast. The three-phase 380V grid power supply is rectified by the power frequency rectifier bridge, and then supplied to the inverter to be converted into high-frequency AC, and then high-frequency transformation and rectification are performed. The output signal is controlled by feedback to obtain a smooth and continuously adjustable DC power supply. , sent to the secondary inverter for conversion, the inverter is converted into low-frequency AC, supplied to the welding car, and the workpiece is automatically welded by the welding car. The invention has the advantages of adopting the latest high-power IGBT switching device, high working efficiency, small no-load loss, stable welding current, large frequency adjustment range and high adjustment accuracy.

Provided is a configurable voltage-controlled oscillator applied to an FPGA. A ring oscillator serves as a core part of the voltage-controlled oscillator and is provided with extra digital control signals used for controlling frequency of an oscillation center. The control signals are configured by means of configuration information of the FPGA, center frequency of the voltage-controlled oscillator can be adjusted, and therefore output frequency of the voltage-controlled oscillator can be continuously adjusted within a large range.

The invention, which belongs to an electronic circuit, more particularly relates to a circuit for detecting a differential capacitor. The invention relates to an all-digital detection apparatus of a differential capacitor. The apparatus comprises a digital controller (1), a digit programmable clock generator (2), a digit programmable waveform generator (3), a charge amplifier (4), a amplificationmultiple programmable instrument amplifier (5), a binary channel synchronization analog-to-digital converter (6). According to the invention, the digital controller is utilized to carry out programming control on clock source provided by the programmable clock generator, so that all output signal frequencies of the programmable waveform generator can be adjusted flexibly according to demands and a frequency adjusting range is large; An amplification factor G of the instrument amplifier is programmablly controlled by the digital controller; when a delta C is small, a delta C detection for a small signal has a high resolution by increasing the G value; when the delta C is large, the delta C detection for a large signal has a large detection range by reducing the G value. The control of the digital controller to all detection links of the differential capacitor is realized by programming, and links of bandpass frequency selection filtering, frequency mixing demodulation, lowpass filtering and the like are completed by software codes; besides, the hardware structure is concise and the flexibility of adjustment is good.

The invention discloses a pendulum eddy current tuned mass damper and a method for achieving structure vibration reduction and relates to the technical field of structure vibration reduction. Two bearings are fixed to the bottom of a top plate of a damper body, and the inner rings of the two bearings are connected through a horizontal rotating shaft. An oscillating bar is vertically arranged below the rotating shaft, the top of the oscillating bar is connected with the rotating shaft, a mass block is welded to the bottom of the oscillating bar, a plurality of permanent magnets are embedded in the two side faces, facing a front plate and a rear plate, of the mass block, and eddy current plates are arranged at the parts, corresponding to the mass block, of the front plate and the rear plate. Springs capable of vertically moving along the oscillating bar are arranged on the left side and the right side of the oscillating bar, and stepless regulation of the frequency of the damper can be achieved by regulating the distance between the springs and the rotating shaft. According to the damper, the moving state of the mass block is stable, the energy consumption mode is reliable, the frequency regulating range is large, and the damper can adapt to medium and high natural vibration frequency.

The invention discloses a CMOS low-gain wide-tuning-range fully integrated Ka-band millimeter wave quadrature voltage-controlled oscillator. A MOS variable capacitor tube array directly controlled by high and low levels is added into an oscillator resonant cavity to switch access capacitance so as to achieve multi-subband tuning for obtaining low-tuning gain, a wide regulating range, and good phase noise performance. In addition, a coplanar waveguide linear inductor used in the voltage-controlled oscillator has a high quality factor in order to achieve better phase noise performance. A circuit directly outputs a differential orthogonal signal with a high orthogonal precision (less than 1 degree). The phase noise of the voltage-controlled oscillator may reach -107.3dBc / Hz and -129.6dBc / Hz at the frequency offset 1MHz and 10MHz at the center frequency 30GHz, respectively. The voltage-controlled oscillator has total power consumption of 80mW, and can be used as a local oscillation signal source in a Ka-band wireless communication system or a voltage-controlled oscillator in a frequency synthesizer.

The invention relates to a filter, a resonator and a communication device. According to the invention, in a process of reducing the temperature drift of the filter by optimizing the height dimension h1 of a metal resonance rod and the height dimension h2 of a boss, an adjusting screw rod is not limited by the resonator and the boss in the process of adjusting the position up and down, that is, in the process of reducing the height h1 of the metal resonance rod, the distance between the metal resonance rod and the top face of the boss in a traditional product does not need to be considered, and the height h1 of the metal resonance rod can be flexibly set according to actual requirements, so that the adjustable range is large, the height h2 of the boss can also be flexibly set according to actual requirements, the adjustable range is large, and the temperature drift of the product can be controlled to be within a preset range; and in order to reduce the temperature drift of the filter, the temperature drift of the filter can be controlled to be in a preset range by selecting an iron material with lower cost instead of adopting a copper material with higher cost, so that the product cost can be reduced at the same time.