398 results about "Level shifting" patented technology

The invention discloses a high-speed level conversion circuit, and belongs to the technical field of integrated circuit design, the circuit mainly comprises an input signal processing module, a voltage boosting module, a differential signal generation module, a signal amplification module and an output module, the input signal processing module converts a low-voltage input signal into a complementary logic signal pair; the voltage boosting module raises the voltage amplitude of the complementary logic signal by using a charge pump principle; the lifted signal drives a thick gate transistor in the differential signal generation module to generate a differential signal; the signal amplification module adopts a cross coupling structure to quickly amplify the differential signal; and finally, the output module outputs a high-voltage domain signal in an inverted manner. By introducing voltage bootstrap before gate driving, the overdrive voltage of a core switch tube is remarkably increased, so that the problem of low conversion speed of a traditional level conversion circuit is effectively solved on the premise of not increasing the device size and static power consumption, and high-speed and high-efficiency level conversion is realized.

The invention discloses an LDO (Low Dropout Regulator) circuit based on a level conversion and pre-adjustment module. The LDO circuit comprises a reference source, an error amplifier, a pre-adjustment module, a level conversion module, a power switch tube P1, a power circuit tube N1 and resistance feedback networks R1 and R2. The pre-adjustment module carries out voltage reduction processing on an input high-voltage power supply, and the level conversion module generates bias voltage according to an enable signal and the high-voltage power supply, controls a power switch and a switch in the operational amplifier, and ensures that the circuit is resistant to high voltage and extremely low in drain. The error amplifier adjusts the grid voltage of the power circuit according to the feedback and reference voltage difference value, and controls the current to stably output the voltage. And the resistance feedback network realizes closed-loop regulation of the output voltage. Under the condition that the LDO is enabled to be closed, the power tube can be ensured to be completely closed no matter the LDO is under the working voltage of 3V or 5V, so that the electric leakage condition of the LDO is greatly improved, and the LDO has the characteristic of low electric leakage.

The invention relates to the technical field of Internet of Things, in particular to a circuit for simultaneously converting UART (Universal Asynchronous Receiver / Transmitter) to multi-path different level communication, which comprises a double-USB input module, a power supply processing module, a USB-UART core conversion module and a multi-path level conversion module, the double-USB input module comprises an MINI-USB interface J6 and a USB-B interface J8, VBUS pins of the two interfaces are connected in parallel through a Schottky diode and then output to the power supply processing module, and data differential pair pins are connected in parallel and then connected to the USB-UART core conversion module; and the power supply processing module comprises an LDO (Low Dropout Regulator) voltage stabilizing chip and a filter capacitor, and is used for converting 5V voltage output by the double-USB input module into 3.3 V stable voltage. The circuit design that the UART is connected with various different levels for communication is adopted, the tool integration technology is achieved, the design that the two USB ports are connected in parallel is adopted, the compatibility of the USB data line can be effectively improved, the demands of customers are met, and the technical difficulty that one UART bus is connected with multiple USB ports is broken through.

The invention discloses a broadband digital phase shifter based on an inductor sharing topology and an equivalent band-pass network, relates to the technical field of microwave integrated circuits, and is suitable for being applied to a Sub-GHz frequency band. The phase shifter comprises a phase shift circuit module and a driving circuit module, and the phase shift circuit module comprises six basic phase shift units including a fine phase shift unit and a coarse phase shift unit which cooperatively realize full-range multi-state phase shift. The fine phase shift unit adopts an inductor sharing topology, so that a phase shift path and a reference path share a circuit architecture, the design is simplified, and the chip layout is optimized; the coarse tuning phase shifting unit adopts an all-pass network as a reference path, a phase shifting path is an equivalent band-pass network formed by cascading a high-pass network and a low-pass network, and the 180-degree phase shifter adopts a double-inductor all-pass network to optimize amplitude-frequency response. And the driving circuit module outputs complementary voltage pairs through the level conversion circuit to drive the switching transistor to realize path switching. The antenna has the advantages of being compact in structure, stable in amplitude, excellent in radio frequency performance and high in adaptability.

The utility model provides a speed sensor which comprises a PCB and a sensor circuit arranged on the PCB, the sensor circuit comprises a power-assisted control unit MCU, a Hall element U1 and a Hall element U2, the Hall element U1 is connected with the input end IN1 of the power-assisted control unit MCU, the Hall element U2 is connected with the input end IN2 of the power-assisted control unit MCU, the Hall element U1 is connected with the input end IN1 of the power-assisted control unit MCU, and the Hall element U2 is connected with the input end IN2 of the power-assisted control unit MCU. The output end OUT of the power-assisted control unit MCU outputs a control signal Signal, the Hall element U1 and the Hall element U2 are arranged in tandem in the rotating direction of the rotating shaft, and the triggering magnetic field intensity of high and low level conversion output by the Hall element U1 and the Hall element U2 is + / -5Gs. The two Hall elements are arranged in tandem, so that the rotating direction of the middle shaft can be judged while the speed is detected, and a wrong power-assisted signal is prevented from being output.

A level shift circuit (1) includes first to fourth P-type transistors, first and second N-type transistors, and a pull-up circuit (30). The first N-type transistor and the first P-type transistor are disposed between the input node and the output node, and the second P-type transistor is disposed between the first power supply and the output node. The second N-type transistor and the third P-type transistor are arranged between the inverted input node and the inverted output node, and the fourth P-type transistor is arranged between the first power supply and the inverted output node. The pull-up circuit (30) is configured to pull up the second node to the third power supply when the first node is converted from the high level to the low level, and pull up the first node to the third power supply when the second node is converted from the high level to the low level.

The utility model discloses a DAC signal conversion circuit of a DC motor, and belongs to the technical field of motor driving. The circuit comprises a power supply voltage conversion module, an integration unit, a voltage follower module and an analog voltage output module. The output end of the power supply voltage conversion module is connected with the input end of the integration unit, the output end of the integration unit is connected with the input end of the voltage follower module, and the output end of the voltage follower module is connected with the input end of the analog voltage output module; and the voltage follower module is used for isolating the output end of the integration unit from the input end of the analog voltage output module. The DAC signal conversion circuit of the DC motor provided by the utility model realizes an efficient and accurate conversion process from a PWM signal to an analog voltage signal, significantly improves the level conversion and response speed, can flexibly control the output amplitude and stability of the analog voltage signal, has the advantages of simple structure, low cost, high reliability, etc. The method can be widely applied to various fields.

The utility model provides a time-delay conduction circuit (10), a driving circuit (30) and a lamp (40). The time-delay conduction circuit (10) comprises a switch module (100), a level conversion module (200), a time-delay module (300) and a control module (400). The first end of the level conversion module (200) is connected with the first end of the switch module (100), and the second end of the level conversion module (200) is connected with the control end of the switch module (100) through the time delay module (300) and the control module (400) in sequence. By means of the level conversion module (200), the time delay module (300) and the control module (400), time delay control over the switch module (100) can be achieved, the switch module (100) is turned on after the voltage provided by the power source (20) is stable, and therefore when the power source (20) generates surge current, the surge current cannot pass through the switched-off switch module (100).

A first circuit receives a single-ended signal and a reference voltage. The first circuit shifts a common mode of the single-ended signal based on a level-shifting current. A preamplifier receives the single-ended signal and the reference voltage from the first circuit and amplifies the single-ended signal to obtain an amplified signal. A decision feedback equalizer (DFE) system receives the amplified signal and the reference voltage from the preamplifier. The DFE system generates a first average signal height of the amplified signal above the reference voltage and a second average signal height of the amplified signal below the reference voltage. A second circuit provides the level-shifting current to the first circuit and adjusts the level-shifting current based on a linearity parameter associated with the amplified signal.

Provided is a novel drive circuit. A level shift circuit has first to third transistors, first to third power supply lines, and first to fourth wiring lines. A back gate of the first transistor is electrically connected with the first wiring line. One of a source and a drain of the first transistor is electrically connected with the first power supply line. The potential of the first power supply line is higher than the potential of the second power supply line, the potential of the third power supply line is lower than the potential of the first power supply line and the potential of the second power supply line, the signal of the fourth wiring line switches from a low potential level to a high potential level when the signal supplied to the first wiring line is at a high potential level, and the signal of the fourth wiring line switches from the high potential level to the low potential level when the signal supplied to the first wiring line is at a low potential level.

The utility model discloses a circuit system of a high-voltage signal generator. The circuit system comprises a DDS main control circuit, a filter circuit, an operational amplifier circuit, a level conversion circuit, a power supply circuit and a crystal oscillator circuit, the output end of the DDS main control circuit is sequentially connected with the filter circuit and the operational amplifier circuit; the operational amplifier circuit is connected with the power supply circuit and the peripheral port; the DDS main control circuit is also respectively connected with the power supply circuit and the crystal oscillator circuit; the level conversion circuit is connected with the crystal oscillator circuit, the DDS main control circuit and the external power supply circuit; the power supply circuit is connected with an external power supply circuit. According to the scheme, numerous application requirements of high-voltage and high-precision signals can be met.

The utility model belongs to servo driver technical field especially relates to a kind of servo driver non-polarity pulse input filter circuit, the circuit is by pulse input module, isolation and level conversion module, primary pulse shaping logic flip module, primary filter module, secondary controllable filter module, secondary pulse shaping logic flip module and MCU pulse collection and filter control module constitute, the utility model is by being arranged bridge rectifier circuit to make circuit not limit the polarity of signal input, reach the effect of arbitrary polarity input.

In a signal processing circuit, an input terminal is configured to receive an analog signal output from an avalanche photodiode operating in Geiger mode. A comparison circuit outputs a signal based on a component exceeding a threshold among components a signal input to the comparison circuit. The adjustment circuit includes an AC coupling unit, a level shifter unit, and a reference value adjustment unit. The AC coupling unit establishes AC coupling between the input terminal and the comparison circuit. The level shifter unit adjusts the voltage of the signal input to the comparison circuit to a value lower than a reverse bias voltage applied to the avalanche photodiode. The reference value adjustment unit adjusts the reference value of the signal input to the comparison circuit.

The invention provides a bulb tube current feedback and synchronous irradiation control system in a blood irradiator, and belongs to the technical field of medical irradiation equipment. Comprising a current acquisition module used for processing target blood by a target blood irradiator and outputting a current signal, a signal conditioning module used for carrying out filtering, level conversion and electromagnetic noise suppression processing on the output current signal, and a current control module. An STM32 microcontroller adopts an incremental proportional control algorithm to dynamically adjust output gain of a high-voltage generator, a synchronous irradiation control module, generation of a synchronous control signal and operation of a management module, a target blood irradiator is controlled to enter a low-power-consumption mode in a non-irradiation stage, and the current of a bulb tube is collected in real time and is processed, so that the current of the high-voltage generator is obtained. High precision and stability of the current signal are ensured, a synchronous control signal is generated according to the current signal after signal conditioning and the irradiation process state, and coordination control of sample rotation and radiation output is realized.

A level conversion circuit (10) includes: an input circuit (12a) that converts an input signal generated by a first voltage power supply (VDD_LV) into a pair of complementary first signals (IN1 and N_IN1); a precharge circuit (14c) that outputs a pair of second signals (N_OUT and OUT) corresponding to the complementary first signals (IN1 and N_IN1) from a first node (N_OUT) and a second node (OUT); and a precharge control circuit (16a) that outputs a pair of third signals (OUT0 and N_OUT0) based on the second signals (N_OUT and OUT) and controls the precharge circuit (14), wherein the input circuit (12a) has a first phase matching circuit (13a) for matching the phases of the complementary first signals (IN1 and N_IN1).

The invention discloses a motor driving circuit, a circuit board and an electric tool, and relates to the technical field of electronic circuits. The circuit comprises a control module, a level conversion module, a buffer module, a driving module and an H-bridge module, the control module is connected with the level conversion module, the level conversion module is connected with the buffer module, the buffer module is connected with the driving module, and the driving module is connected with the H-bridge module; wherein the buffer module is used for transmitting a control signal to the driving module in a delayed manner; and the driving module is used for determining a driving voltage for the H-bridge module according to the driving signal and avoiding common-state conduction of the H-bridge module. Transmission of the control signal is delayed through the buffer module, and then the control signal is converted into the driving voltage for the H bridge module through the driving module according to the control signal, so that simultaneous conduction of an upper tube and a lower tube of a bridge arm on any side of an H bridge is effectively avoided, short circuit of a power supply is prevented, power transistors serving as the upper tube and the lower tube are protected, and the stability of the motor driving circuit is improved.

The invention provides a switching power supply and a driving circuit and a driving method thereof, the driving circuit comprises a level shift circuit, a pulse generation circuit, a high-side driving circuit and a low-side driving circuit, an output signal of the level shift circuit is used for adjusting the potential of a first node in the high-side driving circuit, and an output signal of the pulse generation circuit is used for adjusting the potential of a second node in the low-side driving circuit. The high-side driving circuit drives the high-side switch unit to be switched on after the potential of the first node reaches a switching-on trigger potential, and the high-side driving circuit drives the high-side switch unit to be switched on after detecting that the driving signal of the low-side switch unit is changed into an invalid state and the high-side control signal is changed into an effective state; an additional potential adjusting path is established for the first node, so that the time for the potential of the first node to reach the turn-on trigger potential is shortened, namely the dead zone time from turn-off of the low-side switch unit to turn-on of the high-side switch unit is shortened, the switching speed of the high-side switch unit is increased, the reduction of dead zone loss and switching loss is realized, and the switching efficiency is improved. And the working efficiency of the switching power supply is improved.

Certain aspects of the present disclosure generally relate to power supply circuits and techniques for load voltage drop compensation. An example power supply circuit generally includes: a power stage coupled between the power stage and an output node of the power supply circuit; a feedback circuit coupled to the output node of the power supply circuit and including a feedback node; a level-shifter circuit including an input coupled to the feedback node; and a first current source coupled between the level-shifter circuit and a node of the feedback circuit.

The utility model relates to an isolation conversion circuit which comprises a voltage conversion chip U45, an isolation chip U42 and a level conversion chip U41. The input end of the voltage conversion chip U45 is connected with + 5V voltage, and the output end of the voltage conversion chip U45 is electrically connected with the first power supply input end of the isolation chip U42 so as to transmit the converted + 3.3 V voltage to the isolation chip U42; the isolation chip U42 is suitable for being electrically connected with the CPU chip U15, the isolation chip U42 is in bidirectional electrical connection with the level conversion chip U41, and the level conversion chip U41 is suitable for being in bidirectional electrical connection with RS-232 equipment so as to transmit converted signals; the input end of the voltage conversion chip U45 is electrically connected with a filter capacitor C191, and the output end of the voltage conversion chip U45 is electrically connected with a filter capacitor C86 and a filter capacitor C192; the first power input end of the isolation chip U42 is electrically connected with a filter capacitor C185.

A device including an inverter circuit, a hysteresis control circuit, and a high-side input level shifter. The inverter circuit having an output and including at least two series connected PMOS transistors connected, at the output, in series to at least two series connected NMOS transistors. The hysteresis control circuit coupled to the output to provide feedback to the at least two series connected PMOS transistors and to the at least two series connected NMOS transistors. The high-side input level shifter connected to gates of the at least two PMOS transistors and configured to shift a low level of an input signal to a higher level and provide the higher level to one or more of the gates of the at least two PMOS transistors.

A circuit includes a semiconductor substrate, a first ground terminal, a second ground terminal, a driver circuit, a capacitor, a receiver circuit, and a substrate bias circuit. The driver circuit is on the semiconductor substrate. The driver circuit is coupled to the first ground terminal, and has a first output and a second output. The capacitor has a first terminal coupled to the first output of the driver circuit and a second terminal. The receiver circuit is on the semiconductor substrate. The receiver circuit is coupled to the second ground terminal, and has a first input coupled to the second terminal of the capacitor, and a second input coupled to the second output of the driver circuit. The substrate bias circuit has a first input coupled to the first ground terminal, a second input coupled to the second ground terminal, and an output coupled to the semiconductor substrate.

This invention discloses a level shifting circuit, including a delay signal generation module and a first voltage domain shifting module and a second voltage domain shifting module coupled to each other. The delay signal generation module is electrically connected to an input signal and is used to output different voltage signals after performing different phase inversions and delays on the input signal. The first voltage domain shifting module obtains the output voltage signal of the delay signal generation module by electrically connecting to several ports of the delay signal generation module. The voltage domain shifting module controls the output of a first output voltage based on the output voltage signal of the delay signal generation module. This invention enables individual pull-up and pull-down of the output signal, thereby achieving extremely low transmission delay during signal level shifting, accelerating signal transitions, and maintaining consistent delays, thus protecting the use of MOSFETs.

A semiconductor device is subjected to ON / OFF control by controlling a gate voltage according to a drive control signal. In a turn-on operation for charging a gate in response to transition of drive control signal from a first level to a second level, a drive signal is set to first level to discharge the gate at a first time after end of a Miller period of a gate voltage, thereby providing a voltage drop period in which gate voltage temporarily drops. At a second time, drive signal is again set to second level to start charging the gate.

The present application relates to a frequency synthesizer with dynamically selected level shifting of an oscillating output signal. An oscillator circuit powered by a source voltage generates an oscillating output signal. The oscillating output signal is level shifted and applied to a first input of a multiplexer. A second input of the multiplexer receives the oscillating output signal. The multiplexer selects one of the oscillating output signal and the level shifted oscillating output signal to output as a selected oscillating output signal in response to a selection signal. A lock loop circuit controls a frequency of the oscillating output signal based on the selected oscillating output signal and a reference oscillating signal. The selection signal also selects one of the source voltage of the oscillator circuit and a reference voltage as an error amplifier reference voltage for a voltage regulator circuit that generates a first supply voltage.

Transformer-driven switching devices and transformer-driven power switch systems are disclosed, where the transformer-driven switching devices are used to switch high currents. These devices include power switches, such as gallium nitride (GaN) transistors. Transformers are used to transfer both control timing and power used to control the power switches. These transformers can be coreless, such that they can be integrated within a silicon die. Rectifiers, pull-down control circuits, and their related components are preferably integrated in the same die as the power switches, for example, in a GaN die, such that the transformer-driven switching devices will be fully included in silicon and GaN dies, without necessarily requiring a cored transformer, an auxiliary power supply, or a level shifting circuit.

The invention provides a high-voltage level shift circuit with high dVdt suppression capability, which is used for converting a signal in a low-voltage domain into a signal in a high-voltage domain and comprises an encyclopedia level shift module, a PMOS (P-channel Metal Oxide Semiconductor) coupling module, a noise current elimination module, a current compensation module, a transmission gate module and an RS (Reed-Solomon) latch module, the level shift module is used for transmitting signals from a low-voltage domain to a high-voltage domain, the PMOS coupling module is used for converting voltage signals transmitted by the level shift module into current signals, accelerating signal transmission and preventing common-mode signals from passing through, and the noise current elimination module is used for mirroring current, accelerating signal transmission and counteracting common-mode noise induction current. The current compensation module is used for compensating the current of a node, the transmission gate is used for transmitting a signal output by the noise elimination module to the RS latch, the RS latch module is used for recovering an edge narrow pulse signal into a square signal, and according to the scheme, the dV / dt noise suppression capability of the circuit is enhanced while low power consumption and low delay are achieved.

A gate driver includes a plurality of stages. At least one stage of the plurality of stages includes a logic circuit configured to generate an intermediate carry signal and a carry output signal by sampling a carry input signal based on a clock signal, and to generate an intermediate gate signal by performing a logic operation on an output enable signal, the intermediate carry signal and the carry output signal, a level shifting circuit configured to generate a gate signal by shifting a voltage level of the intermediate gate signal, and a buffer circuit configured to output the gate signal at a gate output node when a high impedance signal has a first level, and to float the gate output node when the high impedance signal has a second level.

The application relates to the technical field of signal processing, and discloses a logarithmic detector, which comprises at least one feedback loop module, multiple rectification modules, a filtering module, a buffer module, a temperature compensation module and a band gap reference module; the feedback loop module is used for amplifying an input differential input signal to obtain an amplified differential signal; the rectification module is used for converting the differential input signal and the amplified differential signal to output a current signal; the buffer module is used for performing level shifting on a filtered voltage signal to output a detection voltage; the temperature compensation module is used for performing temperature compensation on the detection voltage to output an output signal; one feedback loop module comprises one pre-stage limiting amplification unit, two limiting amplification units and a direct current feedback compensation unit. The direct current feedback compensation unit performs negative feedback on the differential input signal, reduces direct current distortion, and improves the precision of the output signal; the temperature compensation module performs temperature compensation on the voltage signal, and improves the precision of the output signal.

The invention relates to the technical field of intelligent power driving in analog integrated circuits, in particular to a novel intelligent power driving chip high-side continuous power supply circuit which comprises a novel charge pump bootstrap power supply circuit and a charge pump capacitor Ccharge. According to the novel charge pump bootstrap power supply circuit, an oscillator is integrated at the control end of a voltage withstanding switch S2A, a clock signal CLK is generated through the oscillator to control on and off of the voltage withstanding switch S2A, meanwhile, the dV / dt state of a floating ground end HS of a charge pump circuit is detected, a dV / dt detection adaptive circuit is matched to generate a control signal of a voltage withstanding switch S1A, and the voltage withstanding switch S2A is controlled to be switched on and off. A high-side continuous power supply circuit is formed by combining charge pump diodes D1 and D2 and a charge pump capacitor Ccharge and continuously supplies power to a bootstrap capacitor Cboot; according to the novel charge pump bootstrap power supply circuit, a high-side integrated level shift circuit in the novel charge pump bootstrap power supply circuit is effectively prevented from working in a high-frequency state, and the dynamic power consumption of the circuit is remarkably reduced while the relatively high power supply efficiency is maintained.