52results about How to "High signal frequency" patented technology

A new pixel in semiconductor technology comprises a photo-sensitive detection region (1) for converting an electromagnetic wave field into an electric signal of flowing charges, a separated demodulation region (2) with at least two output nodes (D10, D20) and means (IG10, DG10, IG20, DG20) for sampling the charge-current signal at at least two different time intervals within a modulation period. A contact node (K2) links the detection region (1) to the demodulation region (2). A drift field accomplishes the transfer of the electric signal of flowing charges from the detection region to the contact node. The electric signal of flowing charges is then transferred from the contact node (K2) during each of the two time intervals to the two output nodes allocated to the respective time interval. The separation of the demodulation and the detection regions provides a pixel capable of demodulating electromagnetic wave field at high speed and with high sensitivity.

The integrated circuit aging test apparatus of the present invention comprises a high temperature test chamber for heating a test device, aging test boards for performing aging test, an integrated circuit board for controlling each aging test board, a signal generator for emitting an excitation signal, a power supply control board for providing adjustable DC voltage, a signal detector for detecting aging input and output signals, an aging power supply for supplying the required voltage to the aging test boards, and a controller for controlling the aging process. The high temperature test chamber includes a box body and a temperature controller; the box body includes a test device loading area for placing the test device, a control cavity for mounting the power supply control board and thesignal generator, and a power supply placement cavity for holding an aging power supply; and the aging test boards are mounted in the test device loading area of the box body. The invention has the advantages of high signal quality and good high-fidelity integrity of the long-distance transmission signal.

The invention discloses a post-casing detection device and a post-casing detection method for a liquid crystal display panel, and relates to liquid crystal display technology, which can detect whether an open grid line of the liquid crystal display panel is successfully maintained or not. The post-casing detection device for the liquid crystal display panel comprises a detection signal generator, a pulse power supply module, a time schedule controller which is connected with the detection signal generator, a grid driver which is connected with the pulse power supply module and the time schedule controller, a source driver which is connected with the time schedule controller, and a variable frequency control unit which is connected with the time schedule controller and is used for increasing the frequency of a signal input into the grid driver. The device and the method are suitable for the post-casing detection of the liquid crystal display panel.

An electrical isolation barrier for use in a Data Access Arrangement uses a high frequency (HF) transformer 24 to provide isolation. An input signal, which may be analog or digital, is connected to a modulator. The analog output of the modulator is connected to the input of the HF transformer. The output of the HF transformer is connected to the input of a demodulator. Simple amplitude modulation can be used in the modulator to modulate the input signal to the frequency range of operation of the HF transformer. A simple low pass filter may be incorporated in the demodulator to remove harmonic distortion caused by the HF transformer. The output signal of the demodulator is substantially the same as input signal.

A delta sigma modulator which has improved the dynamic range. The ΔΣ modulator has a plurality of ADCs and a plurality of DACs, the plurality of ADCs and DACs are connected in a loop. The plurality of ADCs are coupled with an incoming analog signal. A clock generator provides a plurality of clock signals which control the plurality of ADCs and the plurality of DACs, the clock signals being offset relative to each other in the time domain thereby enabling each ADC in the plurality of ADCs one at a time and each DAC in the plurality of DACs one at a time so that the ΔΣ modulator processes data in the incoming analog signal in an interleaved fashion. The delta sigma modulator has an Nth order filter in a forward path of the loop.

A broadband pulse width modulation circuit is provided which can achieve high speed responsibility while assuring an advantage of a pulse width modulation (PWM) circuit having a good power efficiency in order to satisfy a demand for reduction of power consumption and a demand for high speed responsibility in the field of optical communication. The broadband PWM circuit includes a PWM circuit for modulating and smoothing a pulse width in response to an input voltage signal to supply electric current to a load, a frequency band selection and amplification circuit for selectively amplifying only a specific frequency band of the input voltage signal, and a composition circuit for combining electric current from the pulse width modulation circuit and the electric current amplified by the frequency band selection and amplification circuit.

Techniques for implementing transformers with center-taps are described. Based on an overlay winding structure, according to one embodiment, the primary and the secondary of the transformer are respectively formed on two separate layers that are stacked on top of each other, wherein the secondary includes two segments, the two respective terminals of the two segments are coupled together to a component in a circuit to form a center-tap of the secondary. According to another embodiment, three or more separating windings are formed on separate layers. At least one of the windings is a conducting stripe wound in loops and includes a center-tap that extends across but not electrically connected to the loops of the conducting stripe by detouring the conducting stripe through other layers.

The invention relates to a millimeter wave sensor and an intelligent detector. The millimeter wave sensor includes a signal generator, a transceiver integrated chip, a bandpass filter, an amplifier, an A/D converter and a digital signal processor connected in sequence. Compared with the existing 24/77GHz millimeter wave sensor, the millimeter wave sensor has higher signal frequency, strong beam directivity, strong anti-interference ability, small size and light weight; in addition, it adopts the transceiver integrated chip based on SiGe process Compared with the sensor composed of discrete devices, it has the advantages of simple structure, small size and portability, convenient mass production, and low cost, which greatly improves the adaptability of the sensor and provides strong technical support for the increasingly complex information detection environment in the future.

The invention discloses an under-sampling waveform frequency estimation method and a device under strong noise interference. The method comprises the steps as follows: sampling a high-frequency signal containing noise interference through L channels at low speed to obtain L sampling signals; carrying out sampling frequency fsi point FFT transform of the L sampling signals; extracting the frequency corresponding to the peak position of amplitude spectrum as the output of each noise-containing remainder based on the FFT spectrum distribution characteristic of each of the L sampling signals; and using the sampling rate of each channel and a screened error remainder to obtain the frequency estimation of the original high-frequency signal based on an improved Chinese remainder theorem under the condition of low signal-to-noise ratio. The device comprises an acquisition module, a transformation module, an extraction module, a frequency estimation module, and an output drive and display circuit used for output. Frequency measurement of a high-frequency signal after multi-channel under-sampling is realized, and the anti-noise robustness of under-sampling signal frequency estimation is improved under the condition of low signal-to-noise ratio.

A method of interrogating a surface acoustic wave differential sensor formed by two resonators is provided, wherein the method allows the measurement of a physical parameter by determination of the difference between the natural resonant frequencies of the two resonators, which difference is determined on the basis of the analysis of a signal representative of the level of a signal received as echo of an interrogation signal, for a plurality of values of a frequency of the interrogation signal in a domain of predetermined values; the analysis can be based on the cross-correlation of the said signal representative of the level according to a splitting into two distinct frequency sub-bands. An advantage is that it may be implemented in a radio-modem.

The invention discloses a robot remote real-time monitoring system based on cloud computing. The system comprises a signal receiving circuit, an enhanced push-pull circuit and an operational amplifieroutput circuit; the signal receiving circuit receives a data signal of an input end of a signal transmission channel, used for receiving the signal, of a robot remote control terminal based on cloudcomputing; the enhanced push-pull circuit uses a triode Q1, a triode Q2, a triode Q3, a variable resistor RW1 and a variable resistor RW2 to form a signal enhancement circuit for adjusting a signal frequency; meanwhile a rectifier circuit composed of an operational amplifier AR4, a diode D4 and a resistor R11 is designed for rectifying the signal; a triode Q5, a triode Q6, a diode D6 and a diode D7 are used to form a push-pull circuit for eliminating signal self-excitation; and finally the operational amplifier output circuit uses a triode Q7 and a voltage stabilization transistor D8 to form atriode voltage stabilization circuit for stabilizing a voltage, and performs output. The signal of the input end of the signal transmission channel, used for receiving the signal, of the robot remotecontrol terminal is detected in real time, and the signal can be automatically calibrated, so that the signal self-excitation is eliminated.

The invention discloses a rail transit Internet-of-Things node control system. The system comprises a signal sampling module and a comparison detection module, the signal sampling module samples output signals of the rail transit Internet-of-Things node; an output port of the signal sampling module is connected with an input port of the comparison detection module; and signals are abnormal due tonode faults of the Internet of Things. At the moment, the operational amplifier AR3 outputs a high-level signal; meanwhile, an operational amplifier AR3 and capacitors C7-C9 are used for reducing thenoise of the signal, the signal accuracy is ensured, finally, peak signals in the signals are screened by using a peak detection circuit consisting of an operational amplifier AR5, a diode D7 and a diode D8,and the peak signal is used for triggering the signal emitter E1 to work; in order to further improve the precision of the trigger signal, the silicon controlled rectifier D9 is used for detecting the potentials of the inverting input ends of the operational amplifier AR2 and the operational amplifier AR3, the trigger signal of the signal emitter E1 is finely adjusted, and the rail transitInternet-of-Things node control system terminal receives the Internet-of-Things node information in time and responds in time.

The invention discloses a receiver fast automatic gain control system and control method. The system comprises a radio frequency automatic gain control circuit and an intermediate frequency automatic gain control circuit; the radio frequency automatic gain control circuit comprises a radio frequency detector connected with a receiver, the output end of the radio frequency detector is connected with the input end of a radio frequency controller, and the output end of the radio frequency controller is connected with the receiver; the intermediate frequency automatic gain control circuit comprises an interference detector and a useful signal detector which are connected with the receiver, the output end of the interference detector and the output end of the useful signal detector are connected with the output end of an intermediate frequency controller respectively, the output end of the intermediate frequency controller is connected with the receiver, and the input end of the intermediate frequency controller is further connected with the output end of the radio frequency controller. The invention further discloses a control method of the system; the receiver fast automatic gain control system and control method can enable zero intermediate frequency receivers and sliding intermediate frequency receivers to finish gain control rapidly in a short lead code time.

A communication device includes an antenna unit, an adjustment unit and a sensing and processing unit. The sensing and processing unit is electrically coupled to the antenna u and the adjustment unit. The antenna unit is configured to transmit a radio frequency (RE) signal. The adjustment unit is configured to adjust a frequency and a bandwidth of the RF signal. The sensing and processing unit is configured to sense a capacitance, so as to control the adjustment unit to adjust the frequency of the RE signal according to the capacitance, and to control the adjustment unit to adjust the bandwidth of the RE signal according to a system signal.

The invention, which belongs to the technical field of electronic measurement, in particular relates to a high-precision phase difference measurement method and circuit. A high-speed comparator is used for carrying out shaping on two paths of signals; a high-frequency integrated phase discrimination and frequency discrimination device carries out phase comparison to obtain a phase difference pulse; after level conversion, DSP qualitative determination, initial measurement and error correction are carried out to obtain accurate phase difference parameters of the two paths of signals and then the parameters are displayed. With comprehensive utilization of the high-speed phase-discrimination technology and the DSP's fast calculation and processing, accurate measurement of the phase differenceparameters between the two paths of same-frequency input signals in the wide frequency range is realized.

The invention provides a radar antenna side lobe identification algorithm based on signal magnitude-phase characteristics. Sum and difference signals are classified according to different magnitude-phase characteristics of the radar sum and difference signals at a main lobe and a side lobe of a radar antenna by adopting a support vector machine classification method, and then the main lobe and the side lobe are identified, so that the problem of side lobe identification in radar measurement is solved.

An integrator (100) comprises an amplification and phase shifting element (170) with a feedback path (130) forming a loop and comprising a capacitive element (140). An input signal is summed into the loop, and the loop is arranged to oscillate at an oscillation frequency higher than the frequencies of interest in the input signal. The loop includes a filter (160) for attenuating the oscillation signal to ensure that the amplification and phase shifting element (170) can provide amplification for the input signal. The input signal is integrated and the integrated signal perturbs the zero crossings of the oscillation signal.

The invention discloses a coarse tuning and fine tuning combined high-frequency LC voltage-controlled oscillator and a tuning method. The coarse tuning and fine tuning combined high-frequency LC voltage-controlled oscillator consists of an LC resonant network circuit and a common emitter amplifier circuit, wherein the LC resonant network of the circuit is coarsely tuned through the voltage-controlled end by adopting a capacitive impedance form that a variable capacitance diode acts as the reactance in the LC resonant network, is finely tuned through the voltage-controlled end by adopting an inductive reactance branch form that another variable capacitance diode acts as the reactance in the LC resonant network, and has two voltage-controlled tuning ends which are the coarse tuning end and the fine tuning end. By adjusting the magnitude of the reverse bias voltage of the variable capacitance diodes and changing the junction capacitance of the variable capacitance diodes through the combined coarse tuning and fine tuning, the resonant frequency of the resonant network can be changed, and the frequency of the output signals can be finally changed. The coarse tuning and fine tuning combined high-frequency LC voltage-controlled oscillator and the tuning method disclosed by the invention are less in components and parts, simple in circuit and larger in application, achieve an economical and efficient method for generating high-frequency oscillators, and can be widely applied to mobile phones, satellite communication terminals, base stations, radars, digital wireless communication systems and other electronic systems.

Disclosed are a chip performance monitoring system, method and a computer program product, wherein a performance monitor output signal is propagated through an adjacent scan chain to avoid signal degradation incident to across-chip transmission of high frequency signals. Since the clock signal frequency used to control signal propagation through the scan chain will typically be less than twice the performance monitor output signal frequency, frequency sub-sampling with aliasing occurs. To compensate, signal propagation through the scan chain can be controlled during different time periods using different clock signals having different clock signal frequencies and, during these different time periods, different data outputs can be captured at an output node of the scan chain. The data output frequencies of these different data outputs can be measured and the performance monitor output signal frequency can be determined based on the different data output frequencies given the different clock signal frequencies.

A circuit for improved sampler linearity, in an analog to digital converter, by taking simultaneous analog samples of an input signal V(t) and its derivative, dV/dt. The correction can be implemented as a memoryless non-linear model in the analog, digital, or mixed signal domains. Delay elements placed in the clock signal path or main input signal path can provide more precise control over the correction.

The invention relates to the technical field of seismic exploration, in particular to an in-well virtual source method which comprises the following steps: S1, acquiring exploration data according toan exploration task; S2, constructing an in-well virtual seismic source and a ground virtual seismic source for the data acquired in the step S1 by adopting a reverse time invariance principle, and forming a single-shot record received by the ground excitation ground and a single-shot record received by the in-well excitation well through correlation or convolution operation; S3, forming a horizontal view angle and vertical view angle double-view-angle seismic section through conventional seismic data processing; and S4, analyzing the horizontal distribution range of the anomalous body by utilizing the horizontal view angle profile, analyzing the vertical distribution range of the anomalous body by utilizing the vertical view angle profile, and obtaining the spatial distribution range of the anomalous body in the exploration area through result simultaneous analysis. The geophysical characteristics of a medium in an exploration area can be displayed from a vertical view angle and a horizontal view angle, direct waves, reflected waves and multiple waves are used for comprehensive imaging, and the resolution ratio is high.

The invention discloses a direct current brushless motor, a robot and a method for detecting the rotating speed of the direct current brushless motor. The direct current brushless motor comprises a stator, a rotor, an inversion driving circuit, a zero-crossing detection circuit, a sensing circuit and a first controller. The inversion driving circuit is electrically coupled to the stator and is used for driving the phase change of the winding of the stator; the zero-crossing detection circuit is electrically coupled between the stator and the inversion driving circuit and is used for detectingthe zero-crossing point of the counter electromotive force of the direct current brushless motor and generating a zero-crossing signal, and the zero-crossing signal is used for representing the position of the rotor; the sensing circuit is used for detecting the position of the rotor and generating a jump signal when the rotor is in phase change; the first controller is electrically coupled with the zero-crossing detection circuit and the sensing circuit, and obtains the rotating speed of the rotor according to the generating time of the zero-crossing signal and the jump signal. In this way, the speed of acquiring the rotating speed of the direct current brushless motor can be accelerated.

The invention discloses a power cable intelligent monitoring system based on an unmanned aerial vehicle. The system comprises a video image module, a positioning module, a path calculation module, a first controller, a video image module, a second controller, a signal adjustment module, and a monitoring terminal. If the position difference between position information B and position information A is greater than 10m, the first controller gives priority to the position information B, sends the position information B into the second controller and corrects the positioning position deviation of the positioning module, namely, the positioning position information A of the positioning module is corrected into a position signal B, positioning is started again, and a triode Q2 and capacitors C4 and C7 are used for forming an oscillating circuit to improve the signal frequency; LC oscillation consumption is compensated, and meanwhile, an operational amplifier AR3 is used for comparing an output signal of the operational amplifier AR2 with a data reference signal, and if attenuation of the output signal of the second controller is too large, a silicon controlled rectifier Q1 is triggered to be on, so the effect of compensating the signal is realized.