199results about "Pulse generator" patented technology

A control circuit for a switching converter includes a compensation circuit, a ramp generation circuit, a comparison circuit and a logic circuit. The compensation circuit is configured to generate a compensation signal in response to a feedback signal and a reference signal. The ramp generation circuit is configured to generate a ramp signal. The comparison circuit is configured to provide a comparison signal in response to the compensation signal and the ramp signal. The logic circuit is configured to provide the PWM control signal to the switching converter. The PWM control signal is at a first voltage level when a value of the ramp signal reaches a value of the compensation signal. The PWM control signal is at a second voltage level in response to the clock signal.

Provided are a display drive circuit and a display device capable of curbing fluctuation of a signal line voltage. A display drive circuit includes a ramp wave voltage generation circuit that generates a ramp wave voltage whose voltage level changes with time, and a signal line voltage generation circuit that holds the voltage level of the ramp wave voltage at a timing corresponding to a signal level of a pixel signal and generates a signal line voltage. The ramp wave voltage generation circuit includes an amplifier that outputs the ramp wave voltage, a load circuit arranged on a feedback path of the amplifier, and a current generation circuit that controls a current flowing through the load circuit such that the ramp wave voltage matches a reference voltage.

A pulse generating system includes a primary capacitor positioned along a primary side of a pulse generating circuit, and configured to store electrical energy, and a primary switch positioned along the primary side. The pulse generating system also includes a pulse transformer configured to step up voltage from the primary side to a secondary side of the pulse generating circuit; an output capacitor; and a secondary switch positioned in the secondary side, wherein the output capacitor is electrically coupled to the pulse transformer through the secondary switch.

The invention discloses an eddy current displacement sensor sine constant current source excitation method, and belongs to the technical field of sensor measurement and control. The method comprises the following steps: S1, generating positive and negative symmetric reference voltages through a reference voltage source circuit; s2, outputting a square wave control signal with adjustable frequency by the control chip, and driving a switching circuit to generate a square wave taking the positive and negative reference voltage as a level; s3, processing the square wave through a filter circuit to obtain a standard sine wave voltage signal; and S4, converting the sine voltage signal into sine constant current source excitation through a Howland current source circuit, and outputting the sine constant current source excitation to a sensor probe coil. According to the invention, through combination of digital control and analog conversion, the circuit structure is simplified, the cost is significantly reduced, and convenient adjustment of the output frequency and high stability and precision of the output current are realized at the same time.

A class D amplifier circuit receives an analog audio signal with a first reference voltage as its center level, and outputs an output pulse signal having a duty cycle that corresponds to the analog audio signal. A bias circuit generates a second reference voltage having a voltage level obtained as a division of the first reference voltage and the power supply voltage. A periodic voltage generating circuit of the class D amplifier circuit generates a periodic voltage having a triangle waveform or otherwise a sawtooth waveform having an amplitude that corresponds to the second reference voltage.

The invention provides a ramp signal generation circuit and a ramp signal generation method for a power converter. The ramp signal generating circuit compensates the slope of the ramp signal according to the slope compensation curve, and non-linearly adjusts the slope of the ramp signal in a predetermined duty ratio interval of a current ripple offset point of the power converter. The ramp signal generation circuit disclosed by the invention is particularly suitable for a multi-phase power converter and a multi-level power converter, and can effectively solve the problem of gate pulse mixing near a current ripple offset point. By adopting the slope modulation technology, the circuit optimizes the dynamic response performance while keeping the stability of the system. In a working interval of a non-current ripple offset point, the circuit maintains a lower slope signal slope to ensure the system bandwidth. In the preset duty ratio interval near the current ripple offset point, the slope of the ramp signal is smoothly improved in a nonlinear adjustment mode, so that the problem of system oscillation caused by sudden change of the slope in a traditional scheme is avoided.

A sine half-wave generating device comprises a power supply circuit and a test circuit connected with the power supply circuit, a main loop of the test circuit is provided with a connection interface for connection of a test sample, and the test circuit comprises a current peak selection module, a control module, an output module and a waveform direction switching module. The current peak value selection module is used for changing the current peak value on the main loop, and the waveform direction switching module is used for changing the waveform generation direction on the main loop. The beneficial effects of the utility model are that the test circuit is divided into functional modules of current peak value selection, control, output, waveform direction switching and the like, a modularized residual current test system architecture is formed, and sine half-wave pulses which can be flexibly adjusted can be provided according to the performance test requirements of the residual current operated circuit breaker.

The invention provides a driving circuit, a fast charge protocol chip and electronic equipment, and relates to the technical field of power management chips, the circuit comprises a ramp voltage generation circuit and a class AB operational amplifier circuit, the ramp voltage generation circuit comprises a controllable current source circuit, a first capacitor and a clamping circuit, and the controllable current source circuit comprises a current branch; the controllable current source circuit obtains a first current and a second current according to the first digital signal, and the magnitude of the first current and the magnitude of the second current are in positive correlation with the number of the current branches; the first capacitor charges itself according to the first current and discharges itself according to the second current to obtain a ramp voltage signal; the clamping circuit clamps the ramp voltage signal according to the first digital signal and the reference voltage to enable the ramp voltage signal to be lower than the reference voltage; the class AB operational amplifier circuit amplifies the ramp voltage signal to obtain a second digital signal. Therefore, the circuit is suitable for wide-range load capacitance, and has a high power supply rejection ratio.

Provided is a buffer circuit that can realize a wide dynamic range, a reduced area, and a reduced power consumption amount while maintaining low output impedance. The buffer circuit includes a first transistor, a current source, a second transistor, an output terminal, and first and second capacitors. The first transistor has a gate to which an input signal is input. The current source is connected to one terminal of the first transistor. The second transistor is connected to the other terminal of the first transistor. The output terminal is connected to the one terminal or the other terminal of the first transistor. The first and second capacitors are between the current source and the gate of the second transistor. The first transistor, the second transistor, and the first capacitor form a first feedback circuit. The first transistor, the current source, and the second capacitor form a second feedback circuit.

A ramp driver includes a ramp generator for generating a reference ramp signal, and a ramp delayer for sequentially outputting ramp signals based on the reference ramp signal, and including delay blocks including k output terminals, k being an integer greater than or equal to 2, wherein the delay blocks include k delay circuits sequentially connected to each other, respectively connected to the output terminals, and configured to receive an input ramp signal from a previous one of the delay circuits, receive an input gate clock signal from a previous delay circuit, output an output ramp signal by delaying the input ramp signal, and output an output gate clock signal by inverting the input gate clock signal.

The invention provides a digital isolator with both high-speed communication and high common-mode transient immunity. The digital isolator comprises a transmitter, a coupling inductor and a receiver, the transmitter comprises an oscillator, a modulation capacitor assembly and a common-mode transient immunity enhancement module; the oscillator is configured to receive a data signal and generate a first differential signal based on the data signal; the modulation capacitor assembly is configured to modulate a code element 0 into a first frequency and modulate a code element 1 into a second frequency; the common-mode transient immunity enhancement module is configured to determine a bias control signal according to the first differential signal; the receiver is configured to receive the second differential signal and obtain a square wave signal based on the second differential signal; obtaining a triangular wave signal based on the square wave signal; obtaining the maximum value of a triangular wave signal according to the falling edge signal of the square wave signal; and obtaining a target data signal based on the maximum value, so as to solve the problem of low communication and common-mode transient immunity performance of the existing digital isolator.

Devices and methods may include receiving a square wave having a frequency at an input of a harmonic-cancellation (HC) sine-wave generator; receiving a clock signal having a clock frequency at a clock input of the HC sine-wave generator; generating one or more delayed square waves based on the received square wave and the clock signal using one or more delay components of the HC sine-wave generator; and amplitude-scaling the square wave and the one or more delayed square waves using a plurality of taps of the HC sine-wave generator to produce a plurality of amplitude-scaled square waves. The method may include adding the plurality of amplitude-scaled square waves using summing circuitry of the HC sine-wave generator to produce a sine wave having tone at the frequency with suppressed signal strength at selected harmonics of the frequency of the square wave at an output terminal of the HC sine-wave generator.

The invention provides a bipolar narrow pulse triangular wave circuit, and belongs to the technical field of triangular wave circuits, the bipolar narrow pulse triangular wave circuit comprises an MCU, a charging and discharging circuit, a comparison circuit, a voltage division circuit and a follower circuit, the output end of the MCU is electrically connected with the input end of the charging and discharging circuit, and the MCU is used for obtaining PWM signal frequency pulse width setting information and then performing PWM signal-to-bipolar pulse triangular wave operation; the output end of the charging and discharging circuit is electrically connected with the input end of the comparison circuit and used for converting PWM signals into unipolar triangular waves, the input end of the comparison circuit is further electrically connected with the output end of the voltage division circuit and used for converting the unipolar triangular waves into bipolar triangular waves, and the output end of the comparison circuit is electrically connected with the output end of the follower circuit. The bipolar narrow pulse triangular wave generation circuit is mainly driven through the terminal and the MCU, and the cost of the bipolar narrow pulse triangular wave generation circuit is reduced in a soft and hard combination mode.

An electronic device includes a ramp generator configured to generate a ramp signal used to detect data, the ramp signal increasing or decreasing with a certain slope; a main circuit configured to perform at least one predefined function by detecting the data based on the ramp signal; a monitoring circuit configured to output a verify signal indicating whether the ramp signal is faulty; and a controller configured to control execution of the at least one predefined function based on the verify signal.

This invention discloses a high-precision ramp generator and a two-step single-slope analog-to-digital converter. The ramp generator includes a bandgap reference source circuit, a voltage-to-current conversion circuit, a weighted current DAC current source array, a charge / discharge current regulation circuit, a mode switching circuit, and a bias circuit. In this invention, the quantization process of the ramp generator is decomposed into two stages: coarse quantization and fine quantization, significantly reducing quantization time. Furthermore, a single output stage can combine a DAC-type ramp generator and a capacitor-integrating ramp generator, saving area and power consumption in chip design, improving the compatibility of the ramp generator, solving the linearity and stability problems introduced by stepped ramps in high-speed, high-precision applications, and reducing design complexity.

Reduce radiated noise through frequency spreading of clock signals. [Solution] The clock signal generation circuit (10) includes a first modulation signal generation circuit (11) that generates a first modulation signal (Sm1) having a first frequency (f1), a second modulation signal generation circuit (12) that generates a second modulation signal (Sm2) having a second frequency (f2) lower than the first frequency, a signal synthesis circuit (13) that generates a synthetic modulation signal (Smc) by synthesizing the first modulation signal and the second modulation signal, and an oscillator (14) that generates a clock signal (CLK) having a frequency corresponding to the synthetic modulation signal.

A control apparatus includes a first signal generator configured to generate a first reset signal for determining an on-time of a high-voltage side switch of a first phase of a multi-phase power converter; a first comparator configured to generate a first set signal for determining a conduction moment of the high-voltage side switch of the first phase based on comparing the first current sensing signal and the voltage control signal; a first zero-crossing detection circuit configured to detect a zero-crossing point of the inductive current of the first phase; and a first phase bias voltage generator configured to generate a first bias voltage for configuring the first phase to exit the first continuous conduction mode when a zero crossing point of the inductive current of the first phase is detected.

A ramp generator is provided that allows for an increase in the swing range of the ramp signal. [Solution] The lamp generator 10 has multiple control signals CON <n:0>Based on this, the current value of the reference current IREF applied to the first node ND1 is adjusted, and multiple control signals CON are used. <n:0>The system may include a current control unit 300 that controls the current value of the current applied to the second node ND2 based on some of the control signals, a bias voltage generation unit 500 that generates bias voltages VBIAS1 and VBIAS2 based on currents mirrored according to the first node ND1 and the second node ND2, and a ramp signal generation unit 600 that generates a ramp signal VRAMP based on the bias voltages VBIAS1 and VBIAS2.< / n:0>

The present invention relates to a digital amplifier for outputting a pulse-width-modulated output switching signal by amplifying a pulse-width-modulated digital input signal, the amplifier minimizing pulse error between the pulse-width-modulated digital input signal and a PWM pulse signal at the rear of a comparison unit according to audio information so that the distortion rate of an output audio signal can be alleviated and error amplifier characteristics can be enhanced, and being capable of minimizing wafer area and production costs when implemented as a semiconductor integrated circuit.

A voltage converter includes a conversion circuit having an inductor connected to a switching node, a first switching element connected between the switching node and a ground voltage, and a second switching element connected between the switching node and an output node, and a switching control circuit configured to adjust a feedback voltage divided from an output voltage of the output node based on a current state of the inductor, and configured to generate a switching control signal based on a sense signal according to a current of the inductor and the adjusted feedback voltage, for charging the inductor with an input voltage and discharging a voltage charged in the inductor.

The invention relates to the technical field of electronics, and provides a driving circuit. The driving circuit comprises an amplification module, a first filter, a ramp signal generator and an output module, the first filter, the ramp signal generator and the output module are connected with the amplification module, the first filter and the output module are both connected with an LIN bus, and the output module and the amplification module are both connected with a power supply; the first filter is used for filtering an interference signal in an initial signal of the LIN bus and outputting a first filtering signal to the amplification module; the ramp signal generator is used for generating a ramp signal with a preset ramp width according to the received logic signal and transmitting the ramp signal to the amplification module; the amplification module is used for amplifying the first filtering signal and the ramp signal and outputting a driving signal to the output module; and the output module is used for outputting the processed signal of the LIN bus according to the driving signal. Interference signals on the LIN bus are filtered through the first filter, so that communication signal distortion is avoided, and communication quality is guaranteed.

A voltage converter (100) includes a power stage circuit (110), a compensator circuit (130), and a modulator circuit (120). The power stage circuit (110) has an input voltage terminal, an output voltage terminal, and a pulse width modulation (PWM) control input. The compensator circuit (130) has a voltage input coupled to the output voltage terminal, and has a compensation output. The modulator circuit (120) has a compensation voltage input and a PWM control output. The compensation voltage input is coupled to the compensation output, and the PWM control output is coupled to the PWM control input. The modulator circuit (120) includes a slope compensation ramp generator circuit (122) configured to generate a slope compensation voltage ramp having a slope that decreases during at least a portion of a switching period.

The present invention discloses a circuit structure and an electronic device. The circuit structure includes: a charging circuit, which is used to transmit the power supply current of a power supply circuit to a sawtooth wave generating circuit under a first pulse signal; a discharging circuit, which is used to adjust the voltage of the sawtooth wave generating circuit under a second pulse signal, and disconnect the power supply circuit from the sawtooth wave generating circuit during the second pulse signal; a comparison circuit, which is used to compare the voltage of the sawtooth wave generating circuit with a reference voltage and output a first level to an operational amplifier circuit; and an operational amplifier circuit, which is used to adjust the power supply current of the power supply circuit based on the first level.

Disclosed is a ramp signal generator. The ramp signal generator includes: a first unit current source including first sub-unit current sources, and configured to output a first unit current during a first time period; and a second unit current source including second sub-unit current sources, and configured to output a second unit current during a second time period. The first sub-unit current sources are configured to operate according to first sub-ramp control signals, respectively. The second sub-unit current sources are configured to operate according to second sub-ramp control signals, respectively. n first sub-ramp control signals among the first sub-ramp control signals are activated, and m sub-ramp control signals among the second sub-ramp control signals are activated, n and m being different natural numbers.

The invention provides a ramp signal generator, and an image sensor and an electronic device including the same. The ramp signal generator includes: a resistor connected between an output node outputting a ramp signal that increases or decreases at a constant slope and a first power supply node receiving a first power supply voltage; and a plurality of current units. A cell current flows through each of the plurality of current cells and to a first power supply node or a resistor. The plurality of current cells includes a first current cell. The first current cell includes: a first transistor connected between the first switching node and the output node through which the cell current flows to the resistor; a second transistor connected between the first switching node and a first power supply node through which the cell current flows to the first power supply node; and a negative feedback circuit maintaining a constant voltage at the first switching node.

The invention relates to an electronic circuit (10) configured to generate a ramp current signal for a receiver circuit (30), the electronic circuit (1) comprising: a first current unit (20) comprising a first current source (55), a trigger input (25) for activating the first current source (55), and a trigger output (26); a second current unit (21) comprising a second current source (55 '), a trigger input (25) for activating the second current source (55'), and a trigger output (26), the trigger output (26) of the first current unit (20) being connected to the trigger input (25) of the second current unit (21); and a current supply module (24) connected to an input of the receiver circuit (30) and selectively connectable to any one of the first current source (55) and the second current source (55 ').

The invention relates to a device for radio transmission of an interrogation signal (SA1, SA2) from an amplified signal (Sa1, Sa2). This method comprises a signal generator (200) and a selection block (100) for choosing a type of interrogation signal to be transmitted from among at least two different types (Type 1, Type 2). The signal generator (200) is configured to allow the transmission of the amplified signal (Sa1, Sa2) for generating the interrogation signal (SA1, SA2) corresponding to the selected type (Type 1, Type 2).

A waveform generator includes: a system control unit (2) and a plurality of channels, (3.1, ..., 3.N) controlled by the system control unit (2) and configured to supply driving signals (V1, ..., VM) for driving an array of transducers (5.1, ..., 5.N). Each channel includes: a sequential access memory (10) having a plurality of rows, each containing instruction words (W) for generating a respective step of a respective one of a plurality of waveforms, and a memory output (10a) defined by an output row at a fixed location. The sequential access memory (10) contains blocks of instruction words (W), each defining a respective waveform. Each channel also includes an internal control unit (12), configured to sequentially move the content of the sequential access memory (10), based on the instruction word (W) currently at the memory output (10a), so that sequences of instruction words (W) are provided at the output row (10a). A starting instruction word (W) of each block of instruction words (W) defining the waveform contains an identification tag (WT) identifying the waveform. The internal control unit (12) receives a reference tag (TR) from the system control unit (2) and sequentially shifts the sequential access memory (10) until one of the starting instruction words (W) that contains an identification tag (WT) matching the received reference tag (TR) is moved to the memory output (10a).