616 results about "DC bias" patented technology

The invention relates to the technical field of magnetic bias monitoring, in particular to a real-time monitoring method and system for direct-current magnetic bias of a transformer. The method comprises the following steps: acquiring a primary side current signal and an iron core vibration signal of the transformer; analyzing the zero-flux closed-loop characteristic of the primary side current signal of the transformer and performing temperature drift elimination on the primary side current signal of the transformer to generate a primary side optimization signal of the transformer; performing magnetostrictive vibration noise separation on the iron core vibration signal to generate an iron core vibration separation signal; dynamically filtering a power frequency fundamental wave of the primary side optimization signal of the transformer to extract a pure direct current component; and performing wavelet packet decomposition on the iron core vibration separation signal, and performing magnetostriction characteristic spectrum extraction on the decomposed iron core vibration separation signal to obtain an iron core magnetostriction characteristic spectrum. According to the invention, through multi-source signal fusion and material characteristic modeling, the accuracy, real-time performance and graded protection response capability of transformer DC magnetic bias monitoring are improved.

A RF generator includes a RF power source. The RF power source outputs a time-varying signal to a load. At least one controller is coupled to the RF power source. The at least one controller is configured to generate an impedance control signal to control an impedance between the RF power source and the load. The at least one controller is further configured to generate the impedance control signal in response to a pulsed DC output signal from a second power source.

The invention discloses a linear polarization in-band scattering reconfigurable radiation time-sharing regulation array antenna, which belongs to the technical field of antenna engineering, and comprises an antenna unit and a one-to-sixteen power divider, the antenna unit is connected with the one-to-sixteen power divider, and the antenna unit is connected with the one-to-sixteen power divider. The antenna unit comprises a first radiation patch, a first dielectric substrate, a second radiation patch, a second dielectric substrate, a feed coupling branch knot, a feed metal column, a third dielectric substrate, a perforated metal floor and a fourth dielectric substrate, and a first PIN tube, a second PIN tube, a feed transmission line, a direct current bias device, a reflective phase shifter and a low-pass filter are arranged at the bottom of the fourth dielectric substrate; the direct-current bias device is connected with the reflection type phase shifter and the feed transmission line through the low-pass filter, and the feed metal column sequentially penetrates through the third dielectric substrate, the perforated metal floor and the fourth dielectric substrate and is connected with the feed transmission line. According to the invention, the normal radiation efficiency of the antenna can be ensured, and the reconfigurability of antenna scattering can be effectively improved.

The invention discloses a sensor array acquisition system for detecting gas, and relates to the field of gas sensors. The sensor array acquisition system for detecting gas comprises a gas sensor array, a signal conditioning circuit, an analog-to-digital conversion module, a control module and a power supply module. According to the sensor array acquisition system for detecting the gas, the voltage follower circuit with high input impedance is adopted, so that the problem of attenuation during signal acquisition of a high-impedance sensor is effectively solved, and the signal acquisition precision is improved. Through the adjustable direct-current bias circuit and the differential amplification circuit, the dynamic adjustment of the measurement range is realized, the gas detection requirements of different concentration ranges can be met, and hardware does not need to be replaced. A constant-current driving chip is adopted to control a sensor heating circuit, heating current can be accurately set by adjusting external resistance, it is ensured that the sensor works at the optimal temperature, and the stability and response speed of the sensor are improved.

The invention is suitable for the technical field of resonant converters, and provides a starting control circuit and a resonant converter. The starting control circuit comprises a feedback module, a comparison selection module and a logical operation module, the comparison selection module is electrically connected with the feedback module and the logical operation module, the feedback module is used for being electrically connected with the output end of a resonant conversion circuit in the resonant converter, and the logical operation module is used for being electrically connected with a driving circuit in the resonant converter. According to the starting control circuit provided by the embodiment of the invention, the resonant capacitor voltage constraint threshold value which is gradually enlarged along with the starting process can be constructed, smooth establishment of resonant capacitor direct current bias is realized, the fluctuation amplitude of the resonant capacitor voltage is limited, the problem that the total bus voltage is applied to the resonant inductor in a traditional scheme is avoided, and the starting control circuit is suitable for a high-voltage power supply. Finally, the resonance current peak value in the starting stage is effectively suppressed, and the impact of current stress on core devices such as a switching tube and a resonance inductor is reduced.

The invention discloses a transmission type one-bit phase metasurface unit for 5G millimeter waves, and belongs to the field of reconfigurable metasurfaces. The two sides of the receiving patch of the unit are respectively bridged with two PIN diodes which are arranged in the same direction; the radiation patch is respectively connected with the receiving patch and the metal ground through the metal through hole and the metal blind hole; a direct-current bias microstrip circuit and a metal ground which are separated by a semi-solidified substrate are arranged between the two dielectric plates, and the direct-current bias microstrip circuit is connected with the two rectangular patches through metal blind holes. Therefore, the center of the receiving patch is equipotential with the metal ground, and the two sides of the receiving patch are equipotential with the direct-current microstrip circuit, so that the two PIN tubes are always in opposite conduction conditions when the voltage is changed. When the state changes, the induction current directions of electromagnetic waves on the upper surface receiving patch are opposite, and transmission electromagnetic waves excited on the lower surface radiation patch through the metalized through holes generate a phase difference approximate to 180 degrees. The one-bit transmission phase regulation of 5G millimeter waves is realized, and the method has important application prospects in the fields of wireless communication, beam forming and the like.

The present invention discloses a broadband 1-bit reconfigurable circularly polarized reflectarray antenna based on a multi-resonant structure, which includes a reconfigurable circularly polarized reflection functional layer, a circularly polarized horn antenna, and an acrylic bracket. The reconfigurable circularly polarized reflection functional layer is composed of M×N circularly polarized reflectarray antenna elements with the same structure, which are periodically arranged at an interval of 0.4125λ0. The circularly polarized reflectarray antenna element consists of a radiation layer and a DC bias layer. The radiation layer includes a circuit pattern designed based on a multi-resonant structure, PIN diodes, a radiation dielectric layer, and a reflection bottom plate. The DC bias structure includes a DC bias dielectric layer and a DC bias circuit. By controlling the on-off states of four PIN diodes, 1-bit regulation of the unit reflection phase can be achieved. By adjusting the states of each circularly polarized reflectarray antenna element, a beam scanning function of ±60° can be realized, and it can be applied in wireless communication and satellite communication systems.

The invention provides an excitation amplitude automatic closed-loop control system and method for a DLCP test. The system comprises a multi-frequency alternating current excitation and direct current bias voltage applying module which is used for automatically applying alternating current excitation signals and direct current bias voltage signals according to a preset excitation amplitude sequence under a plurality of test frequencies; the PID closed-loop control module is used for performing closed-loop correction on the applied voltage according to the response of the test port of the tested semiconductor device, so that the condition of the applied voltage at the test port meets a preset requirement; the capacitance measurement module is used for acquiring an equivalent capacitance response signal of the tested semiconductor device; the capacitance test data caching module is used for performing associated marking and classified caching on the capacitance test data according to the test frequency, the excitation level and the bias voltage set point; and the main control module is used for coordinating automatic test processes under the conditions of a plurality of test frequencies and different excitation amplitudes and outputting corresponding capacitance test data so as to improve the consistency, stability and automation degree of the DLCP test.

The invention belongs to the technical field of communication, and particularly relates to a 3-bit phase reconfigurable metasurface. The metasurface comprises a two-dimensional array formed by metasurface units and a direct-current bias network formed by bias lines of the metasurface units. Each unit is composed of three metal layers and two dielectric layers, the top layer is used for receiving and radiating electromagnetic waves, the middle layer serves as a ground layer, and the bottom layer serves as a phase shifter to achieve a 3-bit reconfigurable function. The phase shifter is divided into three parts which respectively realize 45-degree, 90-degree and 180-degree phase shifting functions, and eight phase states are realized through combined work of the three parts; the three parts are respectively controlled by a direct-current bias line, the direct-current bias lines of the units form a bias network, and independent regulation and control of the units are realized by loading direct-current control voltage from an external field FPGA (field programmable gate array) for the phase shifter. By changing the phase array coding of the metasurface, the functions of invisible cloak and RCS reduction can be realized. The metasurface has the characteristics of high precision, low loss and multiple functions.

The invention discloses a constant voltage ring and constant current ring automatic switching circuit and a linear power supply, and belongs to the technical field of electrical variable adjustment. Wherein the constant voltage ring comprises a differential sampling link, a direct current bias link and an integration link; the constant current loop comprises a proportional element and an integral element. A differential sampling circuit is arranged in the constant-voltage ring to sample the output voltage of the power supply, the differential sampling circuit is matched with a direct-current bias link to provide superposed voltage for an integration link in the constant-voltage ring, the superposed voltage is compared with set voltage, the switching-in time of the constant-voltage ring is determined, and therefore the constant-current ring can be switched to the constant-voltage ring in advance, and the switching-in time of the constant-voltage ring is determined. And the problem of overshoot of the output voltage of the power supply is prevented. According to the linear power supply, in the process of switching from the constant current stage to the constant voltage stage, the output voltage can be smoothly transited to the target voltage, the condition of step-shaped rising cannot occur, and the switching process is natural and rapid.

Laser control circuitry is described. In one example, a laser controller integrated circuit (IC) includes first and second input ports, a sideband direct digital synthesizer (DDS) coupled to the first input port and configured to produce a modulation signal and a reference signal based on an input signal received via the first input port, the modulation signal and the reference signal having a same frequency. The laser controller IC further includes a Pound-Drever-Hall frequency-locking control loop coupled to the second input port and to the sideband DDS, and configured to produce a corrected DC bias current signal based on the reference signal and a measurement signal received via the second input port, and a thermal management circuit configured to produce at least one thermal control signal.

The invention discloses a simulation analysis method and system for transformer vibration noise under direct current magnetic bias, and the method comprises the steps: building a transformer geometric model, and carrying out the mesh generation of the transformer geometric model; external excitation of the transformer is set in the field-circuit coupling model of the transformer under the direct-current magnetic bias condition, and magnetic density distribution of the transformer under different magnetic bias currents is obtained through simulation; in the transformer electromagnetic structure coupling model, calculating to obtain vibration acceleration of the transformer under different bias currents; the vibration acceleration of the transformer serves as excitation, and sound pressure levels around the transformer under different bias currents are calculated; and analyzing the influence rule of different bias currents on the vibration noise of the transformer through the characteristic quantity of the frequency spectrum signal. According to the invention, the vibration noise characteristics of the transformer under different magnetic bias currents can be accurately simulated, and technical support is provided for judging whether the transformer has a direct current magnetic bias phenomenon or not. The method can improve the evaluation efficiency and simulation accuracy, and improve the noise pollution and overall performance of the transformer.

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

The invention provides an open-circuit fault positioning and detecting system and an open-circuit fault positioning and detecting method based on a dual active bridge resonant converter (DBSRC). The open-circuit fault positioning and detecting system and the open-circuit fault positioning and detecting method based on the dual active bridge resonant converter (DBSRC). Aiming at DBSRC single-tube and multi-tube open-circuit faults, by analyzing characteristic quantities such as resonant capacitor voltage direct-current bias, bridge arm midpoint voltage mean deviation and resonant current direct-current bias and combining a threshold value correction strategy, rapid fault detection and accurate positioning are achieved. According to the method, a plurality of characteristic quantity joint criteria are introduced, the problem of positioning fuzziness caused by the fact that a traditional method depends on a single characteristic quantity is solved, and the reliability and the response speed of fault detection are remarkably improved by means of collaborative optimization of a hardware sensor and a software algorithm. The method does not need a complex control algorithm, has the advantages of being easy to implement, low in cost, high in compatibility and the like, and is suitable for the fields of direct-current microgrids, energy storage systems, power electronic transformers and the like.

The invention relates to a rotor angle confirmation method and device, a vehicle and equipment, and relates to the technical field of vehicles. The method comprises the following steps: acquiring sine and cosine signals output by a motor position sensor; the sine and cosine signals are associated with angle information of the motor rotor; calculating a compensation value of direct current bias deviation and a compensation value of amplitude deviation based on the first sine and cosine signal; the first sine and cosine signal is a sine and cosine signal acquired in a first time interval; the first time interval at least comprises a first period; performing phase compensation on the second sine and cosine signal, and determining the angle of the motor rotor according to the sine and cosine signal after phase compensation; wherein the second sine and cosine signal is a compensated sine and cosine signal obtained in a second time interval; the second sine and cosine signal is obtained by performing compensation based on the compensation value of the direct current bias deviation and the compensation value of the amplitude deviation; the second time interval at least comprises a second period. Therefore, there is a deviation between the calculated rotor angle and the actual rotor angle.

The invention belongs to the technical field of wireless optical communication, and particularly relates to a visible light communication method based on dynamic blocking bias, which specifically comprises the following steps: data acquisition and primary processing; processing and combining the signals; performing dynamic block time domain bias processing; signal receiving and primary processing; noise suppression processing; and demodulating and separating the signal. At a transmitting end, the ACO-OFDM signal, the PAM-DMT signal and the DCO-OFDM signal are mixed, so that the full utilization of subcarriers is realized, and the spectrum efficiency is remarkably improved. Meanwhile, the minimum time domain bias of each signal is calculated, a dynamic direct current bias sequence is constructed, real-time adjustment is carried out according to signal characteristics, the non-negativity of the signals is ensured, the average optical power of the system is effectively reduced, and the light energy utilization rate is improved. The spectrum efficiency and the light energy utilization rate of the visible light communication system are improved, and the method is also suitable for efficient and reliable visible light communication scenes.

A solenoid system and method can include: providing an energizing voltage to a coil of a solenoid; providing an AC signal superimposed onto the energizing voltage; detecting current through the coil including an AC current amplitude induced by the AC signal and including a DC offset current amplitude; determining the AC current amplitude is a low AC current amplitude based on an armature within the solenoid being in a retracted position or determining the AC current amplitude is a high AC current amplitude based on the armature being in an extended position with the control logic, and where the AC current amplitude is determined utilizing the AC signal for synchronous demodulation; and determining a temperature fault based on the DC offset current amplitude falling below a DC offset current amplitude threshold.

The invention relates to the technical field of dual-polarized antenna manufacturing, in particular to an easy-to-feed broadband dual-polarized reconfigurable transmission antenna array, which is provided with a feed source antenna, a direct current bias network and more than two dual-polarized reconfigurable units, wherein each dual-polarization reconfigurable transmission antenna unit is formed by orthogonally arranging two identical reconfigurable transmission units on the same plane, and each reconfigurable transmission unit is internally provided with two linearly polarized dipoles which are arranged along the same direction; the two dipoles form a receiving and transmitting structure of an active receiving dipole and a passive asymmetric transmitting dipole, the two dipoles are separated through a common grounding point and connected through a metalized through hole, and a dipole is connected beside each dipole unit in parallel to serve as a passive parasitic bypass so as to expand the bandwidth of the antenna. The receiving dipole is integrated with two pin diodes.

The invention relates to the technical field of converters, and provides a converter transient DC bias suppression method and system, a medium and equipment, and the method comprises the steps: in response to a current track switching instruction, switching an A-phase duty ratio and a B-phase duty ratio of a three-phase dual-active bridge converter to intermediate duty ratio parameters and switching a C-phase duty ratio to a target duty ratio in a half-switching period, the A-phase phase shift of the three-phase dual-active bridge converter is switched into the initial phase shift before switching, the B-phase phase shift is a middle initial phase shift correlation value, and the C-phase phase shift is switched into the C-phase shift after switching; wherein the initial phase shift before switching and the initial phase shift after switching are both related to the current duty ratio, and the intermediate initial phase shift and the intermediate duty ratio parameter are both related to the target duty ratio and the duty ratio before switching. Therefore, in the process of increasing the duty ratio, the current track can be stably and smoothly transited to a new steady state from an initial state, so that the generation of direct current bias is effectively inhibited.

The invention provides a permanent magnet motor position-free control system DC bias compensator and a compensation method, and the compensator comprises an error calculation module which is used for comparing an original sampling current and an observation current of an alpha-beta coordinate system, and generating an error signal; the QPR regulator module is used for regulating the error signal through a quasi-proportional regulator QPR and outputting a direct-current bias observation value; the input compensation module is used for processing the direct-current bias observation value through the voltage and the counter electromotive force to obtain observation current, and the observation current is transmitted back to the error calculation module to form closed-loop negative feedback regulation; and the direct-current bias compensation quantity generation module is used for converting the direct-current bias observation value in closed-loop negative feedback regulation into the direct-current bias compensation quantity through a relation equation of a direct-current bias sampling value and a direct-current bias component and complex frequency variable conversion. And the direct current bias component in the original sampling current of the alpha-beta coordinate system is accurately compensated in a closed-loop negative feedback regulation mode.

The invention discloses a two-dimensional electric control beam scanning antenna and a beam control method, and belongs to the technical field of antennas. The beam control module is located below the feed structure, radiation units of the radiation unit array are connected with the microstrip line and are periodically distributed on the two sides of the microstrip line, the feed structure is connected with the feed probe, each radiation unit comprises a metal patch, a short-circuit metal column and an active electronic device, and the short-circuit metal column is connected with the active electronic device. The short-circuit metal column sequentially penetrates through the first dielectric substrate, the air guided wave layer, the metal slow wave ridge structure and the second dielectric substrate from top to bottom, the upper end and the lower end of the short-circuit metal column are connected with the metal patch and the direct-current bias network structure respectively, the second dielectric substrate is connected with the metal layer, and a choke structure of the direct-current bias network structure is connected with a bias line. The antenna provided by the invention has the characteristics of low loss, low cost, high gain and two-dimensional wide-angle scanning.

The invention discloses a manufacturing process of a multi-layer insulation press-fit high-voltage-resistant printed circuit board, and relates to the technical field of high-voltage PCBs, and the manufacturing process comprises the steps: 1, taking target field intensity distribution and polarization response as traction, carrying out the reverse deduction of a thickness dielectric attribute and a segmentation sequence, forming a barrier layer stack parameter set version baseline, and taking the baseline as a manufacturing input; 2, formulating an interface activation strategy and a pressing program according to the base line, and implementing pre-drying, vacuumizing, isothermal permeation, sequential curing and controlled cooling and recording; and 3, detecting the dielectric agent amount and the discharge agent amount by using the verification sheet group, and comparing the baseline to generate a manufacturing release packet. 3, setting a field plate and a voltage-sharing pattern under the condition of keeping the base line, optimizing a conductor boundary and a via hole, and carrying out edge sealing and coating; the device is suitable for a scene where direct-current bias and high-frequency pulse coexist, and electric field peak clipping, interface stability, thickness uniformity and alignment control are achieved.

The invention discloses a lumped disturbance parameter observation and permanent magnet synchronous motor control method and system, and the method comprises the steps: collecting the phase current of a motor in each control period, designing a two-degree-of-freedom filter to filter DC bias and high-frequency noise signals, i.e., setting two low-pass filters which are connected in parallel for subtraction, independent suppression of a high-frequency noise signal and direct-current bias is realized by adjusting cut-off frequencies of the two, and decoupling of a filtering effect is realized; then, according to the filtered current signal, a super-spiral sliding-mode observer containing an equivalent feedback gain and an exponential term is constructed to observe a lumped disturbance parameter, the equivalent feedback gain is in an integral form, high-frequency noise can be effectively suppressed, the dynamic convergence process of the observer is smoother due to the additionally designed exponential term, and the lumped disturbance parameter is obtained. And the lumped disturbance parameter observation value is used for model-free current prediction of the motor. According to the invention, direct-current bias and high-frequency noise in the current sampling signal can be effectively filtered out, and the observation precision and control precision of the super-spiral sliding-mode observer are improved.

The invention provides a TEC temperature control method and system based on dynamic direct current bias, and the method comprises the steps: setting a target temperature, calculating a TEC drive current through a PID algorithm, and controlling the cold end temperature to be close to the target temperature through the TEC drive current; detecting the temperature of the cold end in real time, judging whether to start a dynamic direct-current bias adaptive PID mode or not according to a preset condition, starting and recording a TEC driving current in a preset period when the preset condition is met, and calculating to obtain a dynamic direct-current bias current so as to adjust the TEC driving current; detecting the temperature of the hot end in real time, calculating a change trend integral value of the temperature of the hot end in a preset period, and compensating the adjusted TEC driving current to obtain a target TEC driving current; and outputting a corresponding current to drive the TEC to perform temperature control according to the target TEC driving current. According to the invention, environment disturbance can be effectively inhibited, and environment adaptive high-precision precise temperature control is realized.

The invention provides a transformer direct-current magnetic bias feedback device, a converter and a method, the transformer direct-current magnetic bias feedback device is applied to the converter, a transformer in the converter comprises a magnetic core, the transformer direct-current magnetic bias feedback device comprises a magnetic bias detection module, and the magnetic bias detection module comprises an auxiliary magnetic circuit, a magnetic sensor and a signal processing module. The auxiliary magnetic circuit is arranged on the surface of the magnetic core; the magnetic sensor is embedded and fixed in the auxiliary magnetic circuit and is configured to obtain a magnetic density value in the auxiliary magnetic circuit, generate a first voltage signal based on the magnetic density value and output the first voltage signal to the signal processing module; the signal processing module is connected with the magnetic sensor and is configured to obtain a transformer direct current magnetic bias value based on the first voltage signal. By applying the device provided by the invention, the hardware volume can be saved, and the detection cost of the direct current magnetic bias of the related transformer can be effectively reduced while the magnetic bias value of the transformer can be effectively detected.

The invention provides a valve-side direct-current component suppression method for a static synchronous phase modifier system, and the method comprises the steps: calculating a three-phase output voltage vector of a converter valve, and generating a real-time main voltage reference signal of the converter valve; performing split-phase extraction on a direct-current component in the converter valve side current, performing operation on the modulation signal of the direct-current bias and the low-frequency oscillation component, and generating a voltage reference modulation component corresponding to the direct-current component of the three-phase valve side current of the converter valve; and superposing the real-time main voltage reference signal and the voltage reference modulation component to generate a three-phase voltage reference signal of the converter valve, and completing switching control of the sub-module in the converter valve according to the three-phase voltage reference signal. According to the valve side direct-current component suppression method for the static synchronous phase modifier system, the direct-current component in the valve side output current after the static synchronous phase modifier is unlocked can be controlled, so that the direct-current component does not exceed the direct-current endurance capacity of the connected transformer, the safe and stable operation of the transformer is ensured, and the service life of the transformer is prolonged.

The invention discloses a digital-to-analog conversion circuit and a conversion method, and belongs to the field of circuit design. In order to solve the problems that the output amplitude of an existing digital-to-analog converter is fixed, and the resolution needs to be sacrificed or an additional circuit needs to be added during amplitude adjustment, the invention provides a novel circuit structure. On the basis that the circuit comprises a digital output module, a switch module and a weight circuit module, a high-level adjustable reference source and a low-level adjustable reference source are innovatively introduced. The switch module selectively connects the input node of the weight circuit module to the two adjustable reference sources according to the control signal of the digital output module. Therefore, the amplitude and the direct current bias of the output analog signal are directly determined by the voltage values of the two reference sources. According to the invention, the output signal range can be dynamically and flexibly adjusted on the premise that the resolution is not lost, and the bipolar signal can be conveniently generated, so that the system design is simplified, and the cost is reduced.

A calibration circuit and an electronic device belong to the technical field of detection, the calibration circuit is connected with a differential probe, and a sampling circuit performs voltage sampling on an output signal to output a sampling signal; the control circuit outputs a first control signal according to the sampling signal; the direct current bias calibration circuit outputs a first adjusting voltage according to the first control signal; the signal conditioning circuit is further configured to perform direct current bias compensation on the single-ended signal based on the first adjusting voltage so as to output an output signal; therefore, the direct-current bias of the whole system returns to zero, the dependence of system errors on the precision of resistors, capacitors and active devices is reduced, and the accuracy of measurement results is improved.

A non-interferometric thin film lithium niobate electro-optical modulator for data transmission including a laser, configured to generate an input continuous wave light beam; a non-interferometric thin film lithium niobate modulator including an optical waveguide situated along with the coplanar transmission lines and the DC bias conductors. The propagation constant of the optical waveguide is tuned and modulated by the RF data signal and the DC bias voltage traveling on the coplanar transmission lines and the DC bias conductors. The modulator can be tuned at quadrature point by the DC bias voltage. The optical power can be modulated by the RF data signal travelling on the coplanar transmission line; a low noise RF amplifier for data signal amplification; and a bias tee for combining the data signal and DC bias voltage and send them to the coplanar transmission lines.

Disclosed in the present invention is an ultrasonic electronic equipment circuit for isolating high-voltage transmission from small signal reception, which is characterized by comprising a diode bias current control circuit and a diode interconnection circuit, the diode bias current control circuit being used for controlling and regulating the current flowing through diodes in the diode interconnection circuit, and the diode interconnection circuit being used for isolating a high-voltage power output network from an input network of a small signal receiving circuit or connecting a transducer output network to the input network of the small signal receiving circuit. The present invention uses program control to enable or disenable the direct-current bias current of two diodes connected in series so as to turn off and turn on the diodes; when the direct-current bias current of the diodes are disenabled, the diodes are turned off so as to isolate a high-voltage power supply from the receiving circuit; when the direct-current bias current of the two diodes are enabled, the diodes are turned on and have very low alternating current impedance, so as to communicate an output signal of an ultrasonic transducer to the small signal receiving circuit at very low impedance.