61 results about "Push–pull output" patented technology

The invention discloses a high-voltage power amplifier with an over-temperature and over-current protection circuit, and relates to the technical field of integrated circuits. The high-voltage operational amplifier comprises a high-voltage operational amplifier core unit and a self-adaptive protection circuit unit, the high-voltage operational amplifier core unit comprises a rail-to-rail input stage, a gain amplification stage and an AB type push-pull output stage which are sequentially cascaded, and the AB type push-pull output stage comprises a PMOS upper power tube and an NMOS lower power tube; the self-adaptive protection circuit unit comprises a PMOS (P-channel Metal Oxide Semiconductor) current-limiting protection circuit, an NMOS (N-channel Metal Oxide Semiconductor) current-limiting protection circuit and an over-temperature protection circuit; the PMOS current-limiting protection circuit is used for generating a high-voltage domain over-current control signal when the power tube on the PMOS is over-current; the NMOS current-limiting protection circuit is used for generating a low-voltage domain overcurrent control signal when the NMOS lower power tube is in overcurrent; the over-temperature protection circuit is used for generating high-voltage domain over-temperature turn-off signals and low-voltage domain over-temperature turn-off signals when the amplifier is over-temperature; and finally, carrying out logic synthesis on the corresponding over-current control signal and the over-temperature turn-off signal to generate a gate clamping signal.

The invention relates to a two-way current smooth switching system and method without crossover distortion and a double-quadrant power supply, and the system comprises a signal setting unit, a dynamic bias ClassAB push-pull output unit, a feedback sampling unit and a control processing unit. According to the dynamic bias ClassAB push-pull output unit, static micro-conduction bias is provided for N-type and P-type power tubes in a push-pull output subunit through an internal bias subunit, and closed-loop control is combined, so that continuous and smooth transition can be realized when system output current is switched at a zero crossing point in the positive and negative directions, and the system stability is improved. And the problems of crossover distortion and switching dead zone existing in the traditional bidirectional power supply are thoroughly eliminated. According to the invention, high-efficiency, high-speed and distortionless bidirectional current output is realized, the system structure is simplified, and the system can be widely applied to the fields of high-precision test power supplies, battery simulators, servo drivers and the like.

The invention provides a software operation synchronization method and system based on a dual-chip architecture, and abandons a traditional mode depending on a UART / SPI / CAN communication protocol or an additional synchronization circuit. Firstly, a unique PWM duty ratio mapping relation with any difference not smaller than 5% is preset for the initial state, the system self-checking state, the OTA upgrading state, the running state, the fault state, the dormancy preparation state and other running states of the double-chip system, and then a chip A and a chip B continuously output PWM signals matched with the current states of the chip A and the chip B through common GPIO pins in a push-pull output mode. Meanwhile, PWM signals of GPIO pins of the opposite side are collected in real time in a bidirectional mode through respective hardware capture units, the duty ratio is analyzed to obtain the state of the opposite side, response operation is executed according to preset logic, synchronization failures caused by communication delay and data frame error codes of a traditional software protocol are effectively avoided, the system stability is guaranteed, meanwhile, a complex protocol stack does not need to be designed, and the cost is reduced. The CPU load rate is reduced, an additional synchronous circuit is omitted, the chip area and power consumption are reduced, and the hardware cost is reduced.

The invention discloses a digital input and output circuit and an implementation method thereof, and relates to the field of meter metering, the circuit comprises resistors R1 and R2, an MOS tube Q1, a diode D1, a capacitor C1 and a controller, an I / O out control end, an IO in port and an input and output port IO are formed through specific connection, and the implementation method supports three modes of push-pull output, open-drain output and input: the push-pull output realizes level inversion through the MOS tube; the open-drain output is adaptive to an external pull-up power supply; the input mode can receive 3V-5V wide-range signals and switching signals, and the circuit has intelligent mode switching and fault self-diagnosis functions, can be remotely configured through configuration software, can flexibly adapt to different devices, reduces hardware cost, improves stability, and is suitable for scenes of intelligent water meters, industrial automation control and the like.

The utility model discloses an AC charging pile CP signal generating circuit, comprising a level conversion module and a push-pull output module, the level conversion module is used for converting a PWM signal output by an IO port of an MCU into a + / -12V CP signal, and the push-pull output module is connected to the level conversion module and is used for driving high and low level switching of the CP signal. The level conversion module comprises a resistor R1, the left end of the resistor R1 is connected with PWM signals output by an IO port of the MCU, the right end of the resistor R1 is connected with base electrodes of triodes Q2 and Q3, emitting electrodes of the triodes Q2 and Q3 are connected and connected with the lower end of a resistor R2 and the upper end of a resistor R3, the lower end of the resistor R2 is connected with the upper end of the resistor R3, the upper end of the resistor R2 is connected with a + 3.3 V power source, the lower end of the resistor R3 is grounded, and the lower end of the resistor R3 is grounded. The circuit provided by the utility model is simple, and the cost is lower.

The invention belongs to the technical field of semiconductor hybrid integrated circuits, and discloses a broadband high-voltage transconductance derivative amplifier which comprises a component carrier, a two-stage amplifier is arranged on the component carrier, and a shell is arranged on the outer side of the component carrier. The two-stage amplifier comprises a first-stage common-emitter amplifying circuit topological structure and a second-stage push-pull output topological structure, the first-stage common-emitter amplifying circuit topological structure comprises a transistor for amplifying an input signal, and the transistor is connected with a bias circuit; the second-stage push-pull output topological structure receives an electrode signal amplified by the transistor, then carries out power amplification and outputs the signal to an output end, and a feedback circuit is connected between the first-stage common-emitter amplification circuit topological structure and the second-stage push-pull output topological structure, so that the amplifier has the characteristics of wide bandwidth and high voltage output; meanwhile, the working stability and reliability are guaranteed, and the requirements of the aerospace field for the performance and structure of the amplifier are met.

Disclosed in the present invention are a low-voltage differential signaling device and a low-voltage differential signaling driver. An output circuit of the low-voltage differential signaling driver comprises a first current source and a differential push-pull output circuit, wherein the first current source is connected between a power source end and the differential push-pull output circuit, and the differential push-pull output circuit is connected to a differential output end of the low-voltage differential signaling driver, and is used for generating a first output voltage and a second output voltage on the basis of a first input signal and a second input signal. A turn-off circuit of the low-voltage differential signaling driver is connected to the differential output end of the low-voltage differential signaling driver and is used for turning off the first current source by using a short-circuited power source on the differential output end when the low-voltage differential signaling driver is in a leakage protection state. A first end of a substrate clamping circuit of the low-voltage differential signaling driver is connected to the power source end, and a second end thereof provides a substrate potential to a MOS transistor in the first current source. When the low-voltage differential signaling driver is in the leakage protection state, the substrate clamping circuit is in an off-state in the direction from the second end to the first end, such that effective leakage protection can still be performed on the low-voltage differential signaling driver when the low-voltage differential signaling driver is in a power-off state.

The invention provides a touch key circuit based on an MCU (Microprogrammed Control Unit) and a control method. The touch key circuit based on the MCU comprises a control module and a key module, the control module comprises an MCU, the MCU comprises a push-pull output interface and at least one interrupt input / output interface, and the push-pull output interface is used for outputting a level signal; the key module comprises at least one key circuit, and the key circuit is connected with the push-pull output interface and the interrupt input and output interface. According to the invention, touch control can be realized on the basis of not arranging a special touch control chip, and the circuit cost can be reduced.

A high-speed, high-power gallium-nitride-based (GaN-based) operational amplifier (“opamp”) and a GaN-based high-power, wideband linear amplitude modulator (LAM) that may be used to implement a dynamic power supply (DPS) in a high-power, wideband polar modulator are disclosed. The high-speed, high-power GaN-based opamp comprises an input differential amplifier having an input-DC-offset-minimizing circuit and a class AB push-pull output stage including an efficiency-enhancing source follower control circuit that provides for a unique and modified form of buffered frequency compensation. The GaN-based high-power, wideband LAM comprises an input differential amplifier having an input-DC-offset-minimizing circuit, similar to that used in the GaN-based opamp, and a current boost circuit that maintains a source follower in an output stage of the LAM in saturation during times the LAM's output voltage is low.

This invention discloses a driving circuit system and adaptive frequency modulation method for an ultrasonic transducer. The driving circuit system, used to adjust the driving frequency of the ultrasonic transducer, includes a microcontroller processing unit, a driving signal enhancement circuit, a push-pull output driving circuit, a high-frequency transformer, an ultrasonic transducer impedance matching circuit, a push-pull output driving current sampling circuit, a high-frequency transformer output voltage sampling circuit, and a power supply circuit. The adaptive frequency modulation method involves the microcontroller processing unit searching for the resonant operating frequency of the ultrasonic transducer under the current operating environment through the driving circuit in the initial state; and adaptively adjusting the ultrasonic transducer to the resonant frequency during operation. This invention achieves adaptive dynamic frequency adjustment of the ultrasonic transducer without manual tuning; furthermore, since the frequency range is F0±FC, the frequency adjustment range is wide; and the hardware technology is simple, with few components and low cost.

The application discloses a kind of fast response low dropout LDO circuits, including bias generation circuit, capacitive coupling circuit, push-pull output circuit.Bias generation circuit receives reference voltage Vref, output control voltage Vctrl, bias voltage VBIAS1, And bias voltage VBIAS2 to push-pull output circuit, push-pull output circuit output voltage Vout to capacitive coupling circuit, after receiving voltage Vout, the voltage is coupled and then output to push-pull output circuit.Capacity coupling circuit.The structure makes full use of the characteristics of the common reduction of the gate voltage of push-pull output structure, greatly improves the ability of pull current.Through increasing NMOS feedback loop and PMOS feedback loop, when load current suddenly increases or decreases, it can respond quickly, and the power supply noise rejection ratio at low frequency is improved.In addition, the capacitive coupling path is adopted, which makes up for the problem that the response speed of PMOS feedback loop is slower than that of NMOS feedback loop, and improves the transient response speed when load current suddenly increases.

The application discloses a low-voltage differential signal device and a driver thereof, wherein the output circuit of the device comprises a first current source and a differential push-pull output circuit, the first current source is connected between a power supply end and the differential push-pull output circuit, the differential push-pull output circuit is connected with a differential output end of the driver, and is used for generating a first output voltage and a second output voltage according to a first input signal and a second input signal; the turn-off circuit is connected with the differential output end of the driver, and is used for turning off the first current source by using a short-circuit power supply on the differential output end when the driver is in a leakage protection state; the first end of the substrate clamping circuit is connected with the power supply end, the second end provides a substrate potential for a MOS tube in the first current source, and when the driver is in the leakage protection state, the substrate clamping circuit is in a turn-off state from the second end to the first end, so that the low-voltage differential signal driver can also be effectively protected from leakage when the low-voltage differential signal driver is in a power-off state.

The invention discloses a domestic and overseas universal super constant voltage power amplifier. The system comprises an automatic voltage conversion module or a cheap change-over switch or a special module directly customized for an outlet, a high-efficiency power conversion circuit and a multi-mode audio output module, the automatic voltage conversion module can automatically select a 220V or 110V working mode according to the voltage of an external power supply; the high-efficiency power conversion circuit optimizes a power factor through a digital power supply management technology, and improves the power conversion efficiency. The multi-mode audio output module supports a plurality of output modes such as push-pull output, single-ended output, electron tube output, module direct output or module connection with a matching transformer. A traditional heavy transformer and a complex high-frequency switching power supply are removed, the size and the weight of the system are remarkably reduced, the power amplification system is more compact and convenient to transport and install, the digital power management technology is adopted, the power conversion process can be optimized, electric energy loss is reduced, and the overall energy efficiency is improved.

The invention discloses an earphone monomer structure and an application method, and the structure comprises a vibration system which is formed by connecting a voice coil below a rectangular vibrating diaphragm; the magnetic loop system is formed by combining a washer with a magnet; a supporting system is formed by butt joint of a bottom frame, a protection sheet and a shell, the overall planning is based on a voice coil type structure, a similar moving-iron type auxiliary structure is added to the middle part, the biggest characteristic key point is that an internal vibrating diaphragm is changed into a rectangle, one side is provided with a voice coil, and the other side is provided with a coil of a reverse magnetic loop. And a small rectangular sound box with enhanced protection is formed outside, so that a single body is provided with a moving-iron-like cladding, is suitable for modularization and convenient for large-size and small-size production and combined use, not only breaks through the defects of a traditional circular voice coil type structure, but also has a push-pull output effect, and greatly improves the high-resolution sound quality.

The application provides a low-dropout linear voltage regulator with embedded reference high loop gain, and a voltage stabilizing method. The low-dropout linear voltage regulator comprises an adjusting power tube, a source electrode of the adjusting power tube is connected with a voltage input end for providing an input voltage, and a drain electrode of the adjusting power tube is connected with a voltage output end for outputting a voltage; a first loop is electrically connected with a gate electrode of the adjusting power tube, and is used for forming a pseudo push-pull stage; and a second loop is electrically connected with the drain electrode of the adjusting power tube, and is used for forming a bias circuit of the adjusting power tube by the output voltage. The second loop makes the high DC gain of the whole circuit, thereby improving the linearity, load regulation rate and low-frequency PSR, and the pseudo push-pull output stage is realized at the gate electrode of the adjusting power tube, so that the static current of the whole circuit is only in the nA level, and the low-dropout linear voltage regulator has the characteristics of compact structure, no amplifier, low power consumption and high gain.

The invention belongs to the field of integrated circuits, and particularly relates to a JFET (Junction Field Effect Transistor) input operational amplifier suitable for high-speed weak current detection, which comprises a first biasing circuit, a second biasing circuit, a third biasing circuit, a fourth biasing circuit, a fifth biasing circuit and a sixth biasing circuit, the product of the gain of the differential input stage circuit and the gain of the intermediate amplification stage circuit is used as the gain of the amplifier, the complementary push-pull output stage circuit and the intermediate amplification stage circuit adopt a folded common-emitter common-base structure with emitter feedback, and the intermediate amplification stage circuit converts two differential signals output by the differential input stage circuit into single-ended signals. The complementary push-pull output stage circuit further converts the single-ended signal into an output signal of the amplifier. The problems of a trans-impedance amplifier with high gain bandwidth product, high slew rate, low noise and low input bias current required during high-speed weak current detection in the prior art are solved.

The utility model discloses a single line communication circuit and electronic equipment, include: multiplexing interface, switch on module and communication chip, multiplexing interface is used for connecting the port of external device, carries out communication and charges, the port of external device is provided with pull -up resistance, the first end of switch on module connects multiplexing interface, the second end of switch on module connects the first port of communication chip, and the controlled end of switch on module connects the second end of communication chip, communication chip is used for outputting first instruction to switch on module, switch on module is used for when receiving first instruction, and the passage between multiplexing interface and the first port of communication chip is closed, and the first port is provided with push -pull output circuit, the utility model discloses utilize the initial voltage of pull -up resistance access, provide high level for external device and communication chip, and external device or communication chip is convenient through the mode of pulling low high level, realizes data transmission, solves the single line communication problem under the situation of not equal communication level.

This invention provides an operational amplifier, chip, and electronic device, comprising: a differential input stage for receiving a differential input signal; a bias generation circuit for generating a bias signal based on the differential input signal; a push-pull output stage for generating an output signal based on the bias signal; a first overload recovery circuit for pulling up the control terminal voltage of the upper transistor of the push-pull output stage when the output signal of the push-pull output stage is greater than a preset upper limit; and a second overload recovery circuit for pulling down the control terminal voltage of the lower transistor of the push-pull output stage when the output signal of the push-pull output stage is less than a preset lower limit. The operational amplifier, chip, and electronic device of this invention accelerate overload recovery through the overload recovery circuit, limiting the overload recovery time to within 100ns, making it suitable for high-speed applications; and maintaining the stability of the operational amplifier loop under both low and high power supply voltage conditions.

The application discloses a voltage detection method and device, terminal equipment and a computer readable storage medium, wherein when the battery module supplies power to the MCU controller, a voltage detection signal is acquired based on the push-pull output end of the MCU controller; the MCU controller supplies power to the reference module based on the voltage detection signal, and an input reference value of the reference module is acquired through the first digital-analog conversion channel of the MCU controller; the voltage value of the battery voltage provided by the battery module is determined according to the input reference value and the register value of the first digital-analog conversion channel; and the pin voltage value corresponding to the second digital-analog conversion channel in the MCU controller is detected according to the voltage value. The push-pull output end in the MCU controller is integrated with a push-pull output unit, so that the leakage current phenomenon is avoided, and the cost and power consumption of voltage detection through the MCU controller are reduced.

The invention relates to a fault detection circuit of a curve position sensor, a circuit board and fault detection equipment, and relates to the technical field of vehicles, in particular to the technical field of vehicle testing. The circuit comprises a double-voltage comparator and a push-pull output circuit. The push-pull output circuit comprises a first triode and a second triode; the double-voltage comparator receives a first voltage output by the curve position sensor to be tested in a cold test process, and when the first voltage is between a lower limit threshold and an upper limit threshold, the first output end and the second output end both output voltages smaller than a preset threshold, so that the first triode and the second triode are both in a cut-off state. And the push-pull output circuit outputs the second voltage to the cold test detection equipment, so that the cold test detection equipment determines the fault curve position sensor. The fault detection of the curve position sensor is advanced from hot test sampling to a cold test link, so that the risk that fault equipment flows into the market is reduced, and the reworking cost of the fault sensor is greatly reduced.

This invention relates to the field of gate drive circuit technology and discloses a gate drive circuit with adjustable pull-in / pull current capability, including a first-stage level shift circuit, a second-stage level shift circuit, a signal shaping and enhancement circuit, and a configurable push-pull output circuit. The first-stage level shift circuit generates a clamping voltage rail to limit the signal swing; the second-stage level shift circuit converts the ground potential logic signal into a high-voltage floating signal; the signal shaping and enhancement circuit performs waveform shaping and power amplification on the signal. The configurable push-pull output circuit includes multiple parallel push-pull drive branches, divided into normally-operated basic drive branches and optional drive branches controlled by digital signals. This invention dynamically adjusts the total equivalent channel width of the output stage transistor by changing the number of parallel branches in operation, providing a large current to reduce losses when driving large loads and limiting the current to suppress electromagnetic interference when driving small loads, thus achieving flexible adaptation of drive characteristics to load requirements.

The invention discloses an MOS tube optical isolation driver based on a triode push-pull acceleration circuit, and belongs to the field of power electronic driving. The driver comprises a signal isolation stage, an intermediate driving stage and a push-pull output stage, the signal isolation stage realizes electrical isolation of an input control signal and the power driving circuit through photoelectric coupling; the intermediate driving stage converts a weak signal output by the optocoupler into a high-level driving signal; the push-pull output stage utilizes the current amplification characteristic of a complementary triode to form symmetrical push-pull output. Through the Q2 / Q3 push-pull circuit, the grid charging current is increased to 300mA (provided by Q2), the discharging current is increased to 200mA (provided by Q3), the switching delay is reduced to be smaller than or equal to 400ns and smaller than or equal to 600ns, and the highest switching frequency of 800kHz is supported.

The invention discloses a pulse slew rate modulation type weeding system and method and weeding equipment. The system comprises an input power supply; the push-pull output circuit is connected with the input power supply in parallel; the main switch branch is connected with the push-pull output circuit and the input power supply; the plurality of auxiliary inductance branches are connected with the push-pull output circuit and the main switch branch; the active damping network is connected with the main switch branch and the input power supply; wherein the main switch branch and the plurality of auxiliary inductance branches work cooperatively and are used for generating pulse waveforms with different slew rates at an output end, and a load of the output end is connected with the main switch branch and the input power supply; and the active damping network is used for suppressing overshoot and oscillation of the pulse waveform. The energy efficiency bottleneck and the overshoot risk of the RC network are overcome, and the slew rate is dynamically adjustable, so that the requirements of modern agriculture on an efficient, energy-saving and environment-friendly weeding technology are met.

The invention provides an operational amplifier, a chip and electronic equipment, and the operational amplifier comprises a differential input stage which receives a differential input signal; a bias generation circuit generating a bias signal based on the differential input signal; a push-pull output stage generating an output signal based on the bias signal; the first overload recovery circuit pulls up the control end voltage of the upper tube of the push-pull output stage when the output signal of the push-pull output stage is greater than a preset upper limit; and the second overload recovery circuit pulls down the control end voltage of the lower tube of the push-pull output stage when the output signal of the push-pull output stage is smaller than a preset lower limit. According to the operational amplifier, the chip and the electronic equipment, overload recovery is accelerated through the overload recovery circuit, the overload recovery time can be limited within 100 ns, and the operational amplifier, the chip and the electronic equipment are suitable for high-speed application scenes; and the stability of the operational amplifier loop can be maintained under the conditions of low power supply voltage and high power supply voltage.

The invention provides a multi-waveform current source for ground resistance detection, which is characterized in that an ultra-low temperature drift precision operational amplifier is used as a core device to establish a voltage-current conversion loop, the in-phase end and the anti-phase end of the operational amplifier are respectively connected with a high-precision 10k omega resistor, and an equivalent resistor is respectively used as a positive feedback resistor and a negative feedback resistor. The current source circuit takes an analog operational amplifier closed loop and push-pull output as a core, and has the remarkable advantages that the structure is simple, the cost is low, device errors are effectively suppressed through double operational amplifier compensation, the push-pull stage optimizes the low-current loading capacity, the high-precision requirement in a small-current scene can be met, and the requirement of large-current output can also be met.

An RS485 driver control circuit relates to the integrated circuit technology and comprises a three-state inverter, a switch tube push-pull output circuit and a biasing circuit, the switch tube push-pull output circuit comprises a first high-voltage DEMOS tube, a current output end is connected with a reference point Vpx, a first switch tube is arranged between a gate end and the reference point Vpx, and the gate end is connected with a positive push-pull control end; the current input end of the second high-voltage DEMOS tube is connected with the reference point Vpx, the current output end of the second high-voltage DEMOS tube is connected with the bus connecting end, a second switching tube is arranged between the gate end and the reference point Vpx, and the gate end is connected with the positive push-pull input end; the current input end of the third high-voltage DEMOS tube is connected with the bus connecting end, the current output end of the third high-voltage DEMOS tube is connected with the reference point Vnx, a third switching tube is arranged between the gate end and the reference point Vnx, and the gate end is connected with the negative push-pull input end; the current input end of the fourth high-voltage DEMOS tube is connected with the reference point Vnx, the current output end of the fourth high-voltage DEMOS tube is grounded, a fourth switching tube is arranged between the grid end and the reference point Vnx, and the grid end of the fourth high-voltage DEMOS tube is connected with the negative push-pull control end. According to the invention, the data transmission rate and the push-pull output swing are improved.

The application discloses a kind of fast response three-ring LDO circuit structures, including operational amplifier circuit, current bias circuit, control voltage generation circuit, flip voltage follower.Flip voltage follower includes super source follower, push-pull output stage, fast negative feedback loop.The structure makes full use of the characteristics of push-pull output structure gate voltage common reduction, greatly improves the ability of pull current, while by increasing additional gain stage, the power supply noise rejection ratio at low frequency is improved.In addition, due to the adoption of super source follower structure, the node impedance is reduced by negative feedback, and the loop stability is effectively improved.

The invention relates to an operational transconductance amplifier. The improved OTA may include an input circuit arranged to receive a differential voltage input; a load circuit arranged to measure a positive branch current and a negative branch current from the input circuit; a bias circuit arranged to determine a bias voltage based on the negative branch current; a folded current branch circuit arranged to generate an adaptive bias current; and a pass transistor configured to adjust an amount of the adaptive bias current based on the bias voltage; and a push-pull output circuit configured to draw a current based on the adjusted adaptive bias current. The folded current branch circuit may generate an adaptive bias current based on the measured negative branch current. An output circuit may supply a current based on the measured positive branch current. Advantageously, most transistors may have a minimum size.

Pin driver output stage (800) which features the following: a push-pull output stage circuit (806) comprising output transistors (808, 810) configured to support bidirectional current signals at an output node (802); a bias current control (302) configured to adjust a bias current supplied to the output transistors (808, 810) of the push-pull output stage circuit (806) to match an impedance characteristic of the push-pull output stage circuit (806) at the output node (802); a first and a second resistor (Rbasep, Rbasen) which are coupled to the respective base terminals of the output transistors (808, 810); and a feedback control (706) configured to selectively supply a feedback current signal to the first and second resistors (Rbasep, Rbasen) to match the impedance characteristic of the push-pull output stage circuit (806) at the output node (802).