125 results about "Schmitt trigger" patented technology

The invention discloses an MEMS resonator low ripple error temperature measurement system based on voltage feedback compensation, and the system comprises a trans-impedance amplifier, an analog-to-digital converter, a frequency detection module, a PI controller, a variable gain amplifier, a Schmitt trigger, a first digital-to-analog converter, a biasing circuit, mode switches S1 and S2, and a voltage feedback compensation loop. The compensation loop comprises an amplitude detection module, a lookup table, a second digital-to-analog converter and an adder; the amplitude detection module receives the digital signal from the analog-to-digital converter and outputs a vibration amplitude signal in real time; the lookup table receives the vibration amplitude signal, inquires and outputs a corresponding digital compensation voltage, and converts the digital compensation voltage into an analog voltage through a second digital-to-analog converter; the adder adds the analog voltage and a fixed bias voltage to generate a dynamic bias voltage and applies the dynamic bias voltage to a drive electrode of the MEMS resonator. According to the system, an amplitude-driving end bias voltage feedback compensation loop is introduced, so that the periodic ripples of the resonant frequency are effectively suppressed.

The invention provides a multichannel HART (Highway Addressable Remote Transducer) dynamic communication system. The multichannel HART dynamic communication system comprises a modulation circuit and a demodulation circuit, the demodulation circuit of each channel comprises a hysteresis Schmitt trigger module and an analog quantity acquisition module which are parallel, the hysteresis Schmitt trigger module is configured to separate HART signals to obtain FSK signals in the HART signals, and the analog quantity acquisition module is configured to acquire the FSK signals in the HART signals. The FSK signal is converted into a digital pulse signal through the hysteresis Schmitt trigger and then is output to the controller, and the logic level of the digital pulse signal corresponds to the first frequency and the second frequency of the FSK signal; and the analog quantity acquisition module is configured to separate the HART signal to obtain a 4-20mA direct current component in the HART signal, convert the 4-20mA direct current component into a digital signal and output the digital signal to the controller.

The invention discloses a power supply control circuit and an input and output circuit system, and the circuit employs a multi-stage NMOS tube voltage reduction module to replace a diode structure scheme in the related technology. Through cooperative work of the multi-stage voltage reduction module and the multi-stage voltage boosting module, the problem of current leakage caused by too large gate-source voltage difference of a PMOS tube in a POC circuit in the related technology is solved, and output voltage is recovered to IO power supply domain voltage through the multi-stage voltage boosting module. And a pure MOS device design is adopted, and the problem of inconsistent PN junction voltage in a diode scheme does not need to be considered, so that the layout design does not need an additional isolation region, the circuit area is reduced, and the leakage current is reduced. According to the power supply control circuit, voltage step-by-step control is realized, and customized configuration can be carried out according to different voltage domain scenes. The integrated Schmitt trigger filters power supply noise, the trigger logic of the integrated Schmitt trigger is matched with the stage number of the multi-stage voltage reduction module, correct response under different voltage difference environments is achieved, and the reverse voltage of the circuit meets the design requirement.

This invention discloses a self-locking circuit and protection system for emergency communication equipment, relating to the field of emergency communication. The self-locking circuit includes: a Schmitt trigger, an RS latch, a magnetic latching relay, a first driver transistor, a second driver transistor, an inverter, and a reset switch. The Schmitt trigger's input receives an abnormal signal and a reference voltage, and its output is connected to the RS latch's set terminal. The RS latch's output is connected to the base of the first driver transistor. The collector of the first driver transistor is connected to the magnetic latching relay's set terminal, and its emitter is grounded. The reset switch's first terminal is grounded, and its second terminal is connected to the RS latch's reset terminal via the inverter. The RS latch's reset terminal is connected to the base of the second driver transistor. The second driver transistor's collector is connected to the magnetic latching relay's reset terminal, and its emitter is grounded. The magnetic latching relay's output is connected to the emergency communication equipment. By implementing this invention, the problem of repeated device restarts in existing software-based communication management is solved, improving the equipment's operational stability.

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.

The utility model relates to a control device for controlling the flow of a water pump. The control device comprises an electronic flowmeter, a Schmitt trigger, a driving control unit, an electric control selection switch unit, a load unit, an alternating-current transformer and a multi-voltage output power supply unit, the signal output end of the electronic flowmeter is electrically connected with the signal input end of the Schmitt trigger, the signal output end of the Schmitt trigger is electrically connected with the enabling input end of the driving control unit, and the signal input end of the driving control unit is electrically connected with the output end of the multi-voltage output power supply unit. The signal output end of the driving control unit is electrically connected with the selection control end of the electric control selection switch unit; the output end of the alternating-current transformer is electrically connected with one end of each load unit, and the other end of each load unit is electrically connected with the corresponding switch input end; by changing the power supply voltage of the pump motor and changing the rotating speed of the pump motor, the power supply voltage of the water pump motor is reduced, the flow of the water pump is reduced, and waste of water resources is prevented.

A self-filtering monostable PUF circuit based on hysteresis effect is provided. The self-filtering monostable PUF circuit includes a PUF unit array formed by n×m PUF units distributed in n rows and m columns, wherein n and m are integers greater than or equal to 1. By adding a filter unit based on a Schmitt trigger, the self-filtering monostable PUF circuit utilizes the hysteresis effect of the Schmitt trigger to efficiently self-filter the PUF units with unstable outputs to improve the overall stability of the PUF circuit. The advantage of high stability is achieved.

The invention provides a rising edge trigger and a low noise amplifier. The rising edge trigger comprises a first phase inverter, a second phase inverter, a capacitor, a Schmitt trigger, a phase inverter circuit, an NAND gate and a third phase inverter, the input end of the first phase inverter is used for accessing an enable signal for controlling the low-noise amplifier to work; the power supply end of the second phase inverter is used for being connected to the current outflow end of a current source for providing reference current for the low-noise amplifier; the first input end of the NAND gate is connected to the output end of the inverter circuit, and the second input end of the NAND gate is connected to the output end of the first inverter; the input end of the third phase inverter is connected to the output end of the NAND gate, and the output end of the third phase inverter is used for outputting a delay control signal. According to the rising edge trigger, the area of the capacitor can be reduced according to the magnitude of the current of the accessed current source for providing the reference current for the low-noise amplifier, so that the occupied area of the rising edge trigger is reduced.

The utility model relates to the technical field of H-bridge drive circuits, and discloses a high-reliability H-bridge dead-zone generation circuit, which comprises two AND gates for preventing two MOS (Metal Oxide Semiconductor) transistors on the same side of the circuit from being switched on at the same time; the exclusive-OR gate can distinguish input signal directions and output response control signals; the Schmitt trigger is used for converting the curve waveform into a PWM (Pulse Width Modulation) square wave signal and inhibiting noise and interference in an input signal; the RC time delay circuit is connected with the Schmitt trigger and is used for realizing signal delay; the two AND gates comprise a first AND gate and a second AND gate; the first AND gate and the second AND gate are electrically connected with the exclusive-OR gate, and the exclusive-OR gate and the first AND gate are electrically connected with the Schmitt trigger; according to the utility model, the formation of dead zone time is realized through RC time delay and Schmidt characteristics, the condition of circuit damage caused by simultaneous conduction of the H-bridge drive circuit in the working process is avoided, the hardware cost is lower, and the reliability is higher than the reliability realized by software.

The present application belongs to the field of analog integrated circuit, and particularly relates to an RC oscillator without starting circuit. The present application uses Schmitt trigger as the comparator in the RC oscillator, and uses the hysteresis effect and positive feedback characteristics of the Schmitt trigger to reduce the influence of kickback noise. Meanwhile, a reset port is added to the Schmitt trigger, so that the working state of the input end of the RS flip-flop is simultaneously low when the circuit starts; and the two output signals of the RS flip-flop are respectively applied to the reset ends of the two Schmitt triggers through the delay control module, so that the reset signal of the Schmitt trigger cannot control the output result in advance before the input signal changes, and the timing error is avoided. The present application effectively solves the problems of the existing RC oscillator, such as the need of starting circuit and high noise.

The invention belongs to the technical field of integrated circuits, and particularly relates to a level shift circuit applied to a three-phase motor driving chip. According to the circuit, the acceleration function of the high-voltage floating type level shift circuit is realized, and the digital logic gate circuit is used for carrying out waveform shaping on an output signal of the high-voltage floating type level shift circuit and realizing the acceleration function. The level conversion circuit part is a high-voltage floating level shift circuit, and output signals of the level conversion part are finally output by the level shift circuit through a small number of basic logic gates, high-threshold inverters, Schmitt triggers and master-slave RS triggers. The digital logic shaping circuit has the beneficial effects that the problem of overlarge time delay of the whole circuit caused by a Miller platform existing in output signals of a high-voltage floating type level shift circuit is solved, and meanwhile, the problem of waveform logic errors of the output signals caused by delay mismatching of input end signals of an RS trigger of a traditional digital logic shaping circuit is solved.

The invention relates to the technical field of circuits, in particular to a rapid zero-crossing detection circuit and a rapid zero-crossing detection method.The rapid zero-crossing detection circuit comprises a sampling detection circuit, a differential amplification assembly, a comparison assembly and a Schmitt trigger, and the sampling detection circuit is used for obtaining the voltage of a switch output node and the voltage of a power ground node; the differential amplification component is used for respectively amplifying the voltage of the switch output node and the voltage of the power ground node to obtain the amplified voltage of the switch output node and the amplified voltage of the power ground node; the comparison component is used for outputting a zero-crossing signal when the amplified voltage of the switch output node and the amplified voltage of the power ground node meet a preset zero-crossing condition; and the Schmitt trigger is used for outputting a zero-crossing detection result according to the zero-crossing signal comparison assembly, so that the problem that a switch tube has a risk of being broken down due to too slow detection of a zero-crossing detection circuit in related technologies is solved, and the safety of circuit elements and the response speed of the zero-crossing detection circuit are improved.

The invention discloses an APD focal plane pixel circuit with a ToF calibration function, and relates to the technical field of photoelectricity and microelectronics. The circuit is composed of a T-type transimpedance amplifier circuit 1, a time discrimination circuit 2, a flight time calibration circuit 3, a pulse width voltage conversion circuit 4 and an output voltage buffer 5. The invention provides a small-area, low-power-consumption and high-precision ToF detection scheme, the structure is simple, the method is particularly suitable for a focal plane detector, and the requirements of limited pixel area and power consumption can be met; by reasonably designing a feedback network of the T-type trans-impedance amplifier, the T-type trans-impedance amplifier has the advantages of high gain and small area, and is adaptive to a focal plane detector with limited pixel area; according to the ToF calibration scheme combining the Schmitt trigger and the pulse width voltage conversion circuit, the walking error can be calibrated at the cost of small area and power consumption, and the ToF detection precision can be effectively improved without complex means.

The invention provides a time delay unit, which comprises a first phase inverter, a second phase inverter, a third phase inverter, a fourth phase inverter and a fifth phase inverter, the first phase inverter is an intermediate Schmitt trigger delay stage, and the power supply end and the grounding end of the first phase inverter are respectively connected with a second phase inverter structure and a third phase inverter structure; wherein the input ends of the first to third phase inverters are short-circuited as the input end of the delay unit; the power supply end of the second inverter is connected with power supply voltage Vdd, the grounding end is grounded, and the output end is connected with the power supply end of the first inverter; the power supply end of the third phase inverter is connected with power supply voltage Vdd, the grounding end is connected with a grounding wire, and the output end is connected with the grounding end of the first phase inverter; the output end of the first phase inverter is used as the output end of the delay unit; the second phase inverter and the third phase inverter are upper and lower laminated control stages, so that the power supply and the grounding end of the delay stage of the middle Schmitt trigger always keep the same potential state no matter the input end inputs ground or vdd or ground-to-vdd flipping signals or vdd-to-ground flipping signals. According to the invention, the oscillation starting and amplitude problems under low voltage when the power supply voltage is reduced can be improved.

The invention discloses a voltage difference monitoring circuit based on low voltage. The voltage difference monitoring circuit comprises a positive temperature coefficient current source Iptat, an NM1 tube, an NM2 tube, a diode, a resistor R3, a PM1 tube, a PM2 tube, a PM3 tube, an NM3 tube, an NM4 tube, a resistor R2 and a Schmitt trigger. The invention further discloses a voltage difference value monitoring circuit based on the high voltage. The voltage difference value monitoring circuit comprises the positive temperature coefficient current source Iptat, a PM1 tube, a PM2 tube, a diode, a resistor R5, an NM1 tube, an NM2 tube, an NM3 tube, a PM3 tube, a PM4 tube, a resistor R6 and a Schmitt trigger. According to the circuit, generation and difference comparison of zero-temperature-drift threshold voltage can be realized in a single-path structure, and more area and power consumption are saved.

The invention relates to the field of semiconductors, and discloses a two-dimensional material transistor Schmitt trigger circuit and an implementation method thereof, and the two-dimensional material transistor Schmitt trigger circuit comprises a trigger main body part which controls the logic relation between an input signal and an output signal through a positive feedback mechanism, and achieves the hysteretic characteristic; and the booster circuit is used for increasing the voltage of a key node in the trigger main body part and enhancing the output driving capability. The implementation method comprises the following steps: when an input end signal is at a low level, the boosted circuit boosts the voltage at the gate end of the sixth transistor to the voltage of the boosted circuit to realize high-voltage driving; when the input end signal is at a high level, the boost circuit rapidly adjusts the voltage at the gate end of the sixth transistor to a low level. According to the invention, the blank that a two-dimensional material circuit does not have a full NMOS Schmitt trigger is filled, the excellent radiation resistance of a two-dimensional material transistor is fully utilized, and the reliability and stability of the circuit in a high-radiation environment are remarkably improved.

The invention relates to a hybrid mismatch calibration charge pump for a dual-path charge pump phase-locked loop. The hybrid mismatch calibration charge pump is characterized in that high-frequency noise in reference current is filtered through a low-pass filter; the first current copying branch circuit and the second current copying branch circuit copy the filtered reference current and provide current reference for the charging branch circuit and the discharging branch circuit; the charging branch generates charging current; the discharging branch generates charging current; the coarse calibration current unit and the fine calibration current unit are used for adjusting reference current copied by the first current copy branch and the second current copy branch and providing current mismatch compensation; the operational amplifier AMP clamps the reference current after mismatch compensation and the output of the charge pump; the Schmitt trigger is connected in parallel between the power supply end of the charging branch and the output end of the charge pump, closes the charge pump when the output voltage of the charge pump exceeds a set value, and limits the output voltage of the charge pump from deviating from the center voltage. Accurate matching of charging and discharging current is achieved, the circuit is stabilized, and the performance of the charge pump is improved.

The utility model discloses an integrated circuit, which belongs to the technical field of semiconductors, comprises a logic gate circuit Gata, a dead zone control unit, an over-current protection unit and a driving output unit, solves the technical problems of providing stable dead zone control, quickly responding to over-current protection and preventing simultaneous conduction of HO and LO in the process of driving an H bridge, does not need to be controlled by an MCU (Microprogrammed Control Unit), and is convenient to use. The system independence is improved, the hardware circuit response speed is high, RC delay and a Schmitt trigger are adopted, stable and reliable dead time is ensured, efficient dead time control is achieved, a current sampling resistor, a comparator and a D trigger are adopted for over-current detection, the response speed is high, an H-bridge driving signal is cut off immediately during over-current, damage is prevented, the logic gate design ensures that no driving signal exists when A = 1 and B = 1 or A = 0 and B = 0, and the system reliability is improved. H-bridge direct connection is avoided, overcurrent alarm is provided through an ALRM pin, and fault detection of the system is facilitated.

This invention relates to integrated circuit technology, specifically an on-chip aging detection circuit and an integrated circuit chip. The invention comprises a signal sampling and processing module, a voltage-controlled oscillator (VCO), and a Schmitt trigger module connected in series. The signal sampling and processing module outputs a temperature-dependent voltage signal to the VCO. The Schmitt trigger shapes the output waveform of the VCO. The VCO is composed of an odd number of identical inverters arranged sequentially. In adjacent inverters, the output of the preceding inverter is connected to the input of the following inverter; the output of the final inverter is connected to the input of the first inverter. This invention can detect the aging degree of a chip at different temperatures, with temperature having minimal impact on the detection results.

This application discloses a low-power temperature-compensated RC oscillator, comprising a low-voltage linear buffer, an RC core circuit, a comparator, a Schmitt trigger, a non-overlapping clock generator, and a level shifter. The low-voltage linear buffer uses intrinsic transistors to reduce operating voltage and power consumption; the RC core circuit employs temperature compensation technology, including a series low-temperature drift resistor and a temperature-dependent current source, causing the equivalent resistance to increase with temperature; the comparator compares a triangular wave signal with a reference voltage and outputs a reference clock; the Schmitt trigger filters out clock glitches; the non-overlapping clock generator generates a two-phase clock with dead time to control charging and discharging; and the level shifter converts the low-voltage domain clock to the high-voltage domain. This oscillator eliminates the influence of comparator offset voltage through two-phase switching control and employs low-voltage and temperature compensation technology to achieve a high-precision, low-temperature drift reference frequency in a small area with low power consumption, making it suitable for compact sensing and measurement systems.

A power sensing circuit in a first voltage domain senses an input voltage from a second voltage domain and provides a power OK signal. The maximum supply voltage of the first voltage domain is above a maximum tolerance for devices in the first voltage domain. Accordingly, protection techniques are employed to ensure that the potential difference between any two terminals of devices in the power sensing circuit does not exceed the maximum tolerance limit. The protection techniques utilize reference voltage-based techniques including level shifting and use of protection devices in transistor stacks. An over-voltage tolerant Schmitt trigger circuit is also employed in the power sensing circuit. A trip point device on the input of the power sensing circuit utilizes a programmable bias voltage to adjust the trip point of the power sensing circuit to accommodate different maximum input voltages from the second voltage domain.

The utility model relates to the technical field of instrument power supplies, in particular to a power supply with overload protection, which is provided with a sampling resistor, when the power supply is accessed as a standby power supply, because the voltage is basically equal to the voltage of a power supply to be maintained, and the output current is smaller, when the power supply is controlled to boost by a voltage-regulating excitation source, the sampling resistor is switched on. As the dynamic impedance at the moment is approximately equal to the impedance of the sampling resistor, the change rate of the output current of the power supply is large, and when the output current of the power supply reaches the current required by the load, the change rate of the output current of the power supply is small. The differential operational amplifier circuit, the differentiating circuit, the Schmitt trigger and the voltage-regulating excitation source generate voltage which enables the output voltage of the power supply to be gradually increased when the current change rate is relatively high, and the increasing process is stopped when the output current reaches the current required by a load; load current is smoothly transferred to the standby power supply from the power supply to be maintained, and overload of the sensor is avoided.

This invention relates to the field of radio frequency (RF) technology, and particularly to a phase comparison circuit and an RF chip. The phase comparison circuit includes a first amplifier, a second amplifier, a first frequency divider, a second frequency divider, a first Schmitt trigger, a second Schmitt trigger, a first flip-flop, a second flip-flop, an AND gate, a first filter unit, and a second filter unit. The input of the first amplifier receives a first RF signal, and its output is connected to the input of the first frequency divider. The input of the second amplifier receives a second RF signal, and its output is connected to the input of the second frequency divider. The first and second frequency dividers are used to down-convert the amplified first and second RF signals, respectively. Compared with existing technologies, the phase comparison circuit provided by this invention has a simple structure, a wide phase detection range, stable output, and can effectively reduce the complexity of RF front-end power control.

The invention provides a radio frequency switch interface multiplexing circuit which is applied to an interface circuit of an integrated circuit. The Schmitt trigger circuit comprises a plurality of first Schmitt triggers, a plurality of second Schmitt triggers and a charge pump module. The first Schmitt triggers are used for processing MIPI signals, and the input end of each first Schmitt trigger is connected with an external input voltage, so that the radio frequency switch works in an MIPI working mode by controlling the level of the external input voltage. And the second Schmitt trigger is used for processing the GPIO signal and is powered by the charge pump module. Since the first Schmitt trigger and the second Schmitt trigger are powered by different power supplies, the radio frequency switch chip for processing the MIPI signal and the radio frequency switch chip for processing the GPIO signal can be integrated only by changing the level of the external input voltage, false triggering can be avoided, and the reliability of the radio frequency switch chip is improved. And finally, the practicability is improved, and the application is wider.

The invention relates to a high-voltage-withstanding over-temperature protection circuit for a power amplifier, and belongs to the field of integrated circuits. The over-temperature protection circuit comprises low-voltage NMOS (N-channel metal oxide semiconductor) tubes NM0-NM2, low-voltage PMOS (P-channel metal oxide semiconductor) tubes PM0-PM10, high-voltage NLDMOS (N-channel laterally diffused metal oxide semiconductor) tubes NM3-NM4, a high-voltage NLPMOS (N-channel P-channel metal oxide semiconductor) tube PM11, NPN triodes Q0-Q2, a Schmitt trigger schmitt, inverters inv1-inv2 and resistors R0-R2. The MOS tubes NM1-NM2, the MOS tubes PM0-PM1 and the resistor R0 form a self-bias current source; the MOS transistors PM2-PM3 are P-type current mirrors and copy the current of the self-bias current source; a low-voltage logic level with temperature information is provided by the MOS tube NM0, the triode Q0 and the resistors R1-R2; the flip of a logic level is realized by the Schmitt trigger schmitt and the phase inverters inv1-inv2; the MOS tubes PM4-PM9 realize conversion from low voltage to high voltage; the MOS tubes NM3-NM4 are high-voltage-resistant devices and play a role in voltage resistance; the MOS transistors PM10-PM11 and the triodes Q1-Q2 play a bias role, so that correct logic high level is output under high voltage. The over-temperature protection circuit solves the problem that the logic level is difficult to confirm under high voltage, and is simple in structure, low in power consumption and resistant to high voltage, so that the over-temperature protection circuit has very high use value and popularization value.

The utility model discloses a Feiteng FT2000 main control computer and power-on self-starting circuit, the power-on self-starting circuit includes RC circuit, Schmitt trigger and MOS switch, the RC circuit includes first RC circuit and second RC circuit that are connected in parallel, the first RC circuit includes first resistor and first capacitor that are connected in series, and the second RC circuit includes second resistor and second capacitor that are connected in series. The first RC circuit comprises a first resistor and a first capacitor which are connected in series, the second RC circuit comprises a second resistor and a second capacitor which are connected in series, the Schmitt triggers comprise a first Schmitt trigger and a second Schmitt trigger, the MOS switches comprise a first MOS switch and a second MOS switch, and the first Schmitt trigger and the second Schmitt trigger are respectively connected in series to the first RC circuit and the second RC circuit. The first MOS switch is connected to the second RC circuit in series, the second MOS switch is connected between the RC circuit and a PWRBTNEN pin of the FT2000 processor in series, the resistance value of the first resistor is larger than that of the second resistor, and the design cost of the self-starting circuit can be greatly saved.

The invention relates to a self-adaptive dead time generation circuit based on a current mirror load and a generation method thereof, and the circuit comprises a first signal path A which is used for processing a PWMH signal and outputting a signal OUTA with dead time; the second signal path B is used for processing the PWML signal and outputting a signal OUTB with dead time; the biasing circuit comprises a PMOS (P-channel Metal Oxide Semiconductor) tube MP5, a PMOS tube MP7, an NMOS (N-channel Metal Oxide Semiconductor) tube MN7 and a temperature coefficient compensation resistor R1, and is used for generating a reference current IREF with stable temperature; the dynamic feedback module comprises NOR gates NOR1 and NOR2, a Schmitt trigger SMIT, a PMOS transistor MP6 and a resistor R2, and the dead time is prolonged by detecting the current state; the first signal path A is connected with the second signal path B, the first signal path A and the second signal path B adopt mirror image design, each path is composed of two stages of delay units, and the biasing circuit and the dynamic feedback module are connected with the first signal path A and the second signal path B respectively. The system reliability is remarkably improved.

The application discloses a low-power-consumption temperature sensor circuit, which comprises a temperature sensing core circuit, a starting circuit, a current reference circuit and a buffer circuit; the temperature sensing core circuit is composed of a band gap reference and a positive temperature current generating circuit, and generates a voltage proportional to temperature; the starting circuit is composed of a Schmitt trigger starting circuit and a band gap reference starting circuit, and prevents latch effect from occurring when power is applied; the current reference circuit adopts a voltage-controlled current source to provide stable and load-independent current; and the buffer circuit adopts a source follower connection method of two-stage operational amplifiers, the first stage adopts a differential-to-single-end diode to load a common source amplifier structure, and the second stage adopts a current source to load a common source amplifier structure. The application does not need complex circuits such as ADC to process temperature data, and only needs a band gap reference and a positive temperature generating circuit to realize temperature detection of a chip, so that the design difficulty of the circuit is reduced, and the power consumption of the circuit is lowered.

The present application relates to the technical field of temperature control, in particular to a refrigeration control device for reagent bin temperature control, comprising a controller and a refrigeration module; the refrigeration module comprises a signal detection input unit, a voltage following unit, a first comparison circuit unit, a second comparison circuit unit, a Schmitt trigger unit, a driving output unit, an optical coupling isolation unit and an output control unit; when the reagent bin is normally working, refrigeration related control is controlled by the controller; when the refrigeration switch is opened, the controller is powered off, and the refrigeration module circuit is self-adjusted to control refrigeration, so that the problem that the refrigeration module cannot realize temperature control under the condition that the MCU is powered off and the refrigeration module circuit is continuously powered is solved.

The application provides a rising edge trigger and a low noise amplifier. The rising edge trigger comprises a first inverter, a second inverter, a capacitor, a Schmitt trigger, an inverting circuit, a NAND gate and a third inverter. An input end of the first inverter is used for connecting an enable signal for controlling the working of the low noise amplifier. A power supply end of the second inverter is used for connecting to a current outflow end of a current source for providing a reference current for the low noise amplifier. A first input end of the NAND gate is connected to an output end of the inverting circuit, and a second input end of the NAND gate is connected to an output end of the first inverter. An input end of the third inverter is connected to an output end of the NAND gate, and an output end of the third inverter is used for outputting a delay control signal. The rising edge trigger can reduce the area of the capacitor by the current size of the current source for providing the reference current for the low noise amplifier, so as to reduce the occupied area of the rising edge trigger.