182 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 provides a resistor and capacitor measuring circuit and method, and relates to the technical field of resistor and capacitor measurement, and the resistor and capacitor measuring circuit comprises a switch S1, a switch S2, a switch S3, a switch S4, a switch S5, a switch S6, a reference capacitor CREF, a capacitor CTEST to be measured, a reference resistor RREF, a resistor RTEST to be measured, a Schmitt trigger u1, a time-to-digital converter TDC and a microprocessor muC. And the Schmitt trigger u1, the time-to-digital converter TDC and the microprocessor muC are sequentially connected in series. According to the resistor-capacitor measuring circuit and method, the discharge time of the reference resistor-capacitor and the discharge time of the resistor-capacitor to be measured are respectively measured through the time-to-digital converter, the time proportion is calculated, and the parameters of the resistor-capacitor to be measured and the resistor-capacitor to be measured are calculated and reversely deduced by combining the known reference capacitor and the resistor. The correction compensation amount is obtained through an additional measurement state, and then the measurement result is corrected, so that the influence of the conduction loss of the switch on the measurement result is greatly reduced.

The invention discloses an oscillation protection circuit, an electronic load, a power supply test system and equipment, the circuit comprises a switch module and an oscillation detection circuit, and the switch module is connected with a control signal input end of a closed-loop control circuit; the oscillation detection circuit comprises a sampling unit, a coupling capacitor unit, a Schmitt trigger and a D latch, the sampling unit is used for sampling the voltage and / or current of the closed-loop control circuit, and the output end of the sampling unit is connected with the input end of the coupling capacitor unit so as to be used for obtaining an alternating current component in the sampled voltage and / or current; the output end of the coupling capacitor unit is connected with the input end of the Schmitt trigger, the output end of the Schmitt trigger is connected with the first input end of the D latch, and the output end of the D latch is connected with the control end of the switch module. Fuses and software control are not needed, the protection response time can be shortened, and the reliability of oscillation protection is improved.

According to an embodiment, a max-pooling neuron with first and second integrator circuits, a comparator circuit, a Schmitt trigger circuit, and a pair of switches is provided. The first and second integrator circuits, respectively filter a first and a second input train from a first and a second neuron of a previous layer to generate a corresponding first and second filtered input train. The comparator circuit amplifies a difference between the first and second filtered input trains and generates an amplified differential signal. The Schmitt trigger circuit generates a binary output signal based on the amplified differential signal. The pair of switches have a common first terminal coupled to an output node of the max-pooling neuron and a common control terminal coupled to the output terminal of the Schmitt trigger circuit. The other terminals of the pair of switches are coupled to respective input trains.

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.

The invention relates to a LINK-JOINT asymmetric large delay matching unit based on a Schmitt trigger and application of the LINK-JOINT asymmetric large delay matching unit. The large delay matching unit comprises an input stage circuit used for realizing inversion and preliminary transmission of signals; an intermediate stage circuit for amplifying the signal and introducing a delay; the inverted proportional tube circuit is used for further increasing the delay time of the signal and realizing voltage following and amplification; the output stage circuit is used for outputting the processed signal; the auxiliary circuit provides a feedback mechanism, the input stage circuit, the intermediate stage circuit, the inverted proportional tube circuit and the output stage circuit are respectively provided with a pair of complementary PMOS (P-channel Metal Oxide Semiconductor) tubes and NMOS (N-channel Metal Oxide Semiconductor) tubes, the auxiliary circuit is provided with two NMOS tubes of which the sources are connected to the same line, an input signal I is connected with the input stage circuit, and an output signal O is connected with the output stage circuit. The large delay matching unit can be applied to an asynchronous self-clock control system of a Bluetooth chip, and the large delay matching unit can be used between nodes of a data path in a delay matching circuit module.

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.

The invention discloses a same-precision measurement device and method for wide-range frequency signals in the technical field of vehicle engineering. The device comprises a first filter circuit, a clamping circuit, a conditioning circuit, a second filter circuit and a microprocessor which are electrically connected in sequence, the first filter circuit and the second filter circuit are both used for filtering electrostatic interference and low-frequency noise; the clamping circuit is used for protecting a rear-end circuit; the conditioning circuit comprises a non-inverse Schmitt trigger and is used for eliminating signal noise interference; the microprocessor comprises a timer and is used for carrying out frequency counting on the frequency signal; the method comprises the steps that when a measurement result exceeds a preset frequency threshold value, an improved M / T method is adopted for frequency measurement, and when the measurement result does not exceed the preset frequency threshold value, an improved T method is adopted for frequency measurement; according to the invention, the same measurement precision can be maintained in a wide frequency range, and the real-time performance is good.

The invention discloses a universal input / output interface, and belongs to the technical field of transmission interfaces of digital circuits and analog circuits, the universal input / output interface comprises a TX module, an RX module and a withstand voltage protection circuit, and the TX module comprises a first phase inverter; a second inverter; a first AND gate; a second AND gate; a first NAND gate; a second NAND gate; a third NAND gate; a third AND gate; a bias circuit; a level conversion circuit; a buffer; a first pmos tube; a second pmos tube; a first nmos tube; a second nmos tube; a third pmos tube; a fourth pmos tube; the RX module comprises a Schmitt trigger; a first switch; a pull-up resistor; a pull-down resistor; a second switch; the withstand voltage protection circuit comprises a third nmos tube to a seventh nmos tube; a fifth pmos tube to a tenth pmos tube; the electrostatic discharge protection circuit includes a p-type diode and an n-type diode. The range of the output level signal is selectable, and the application scenarios of the circuit can be increased.

The present invention provides a high-efficiency charging integrated micro super capacitor group chip, which includes a power supply circuit, a voltage balancing circuit, a micro super capacitor group and a control circuit. The micro super capacitor group and the circuit are manufactured on a silicon base using a semiconductor manufacturing process, combined together by a silicon-based bonding technology, and then packaged; wherein the control circuit is respectively connected to the power supply circuit, the voltage balancing circuit and the micro super capacitor group; the output end of the power supply circuit is connected to the voltage balancing circuit and the micro super capacitor group to supply power to the voltage balancing circuit and the micro super capacitor group; the voltage balancing circuit is connected to the micro super capacitor group, and the voltage balancing between each capacitor in the micro super capacitor group is achieved through the voltage balancing circuit; the micro super capacitor group is composed of a plurality of micro super capacitors. The present invention combines a micro energy storage device with a circuit, uses a comparator and a resistor to form a Schmitt trigger for voltage detection, a buffer, and an inverter to realize a feedback channel, so as to respond quickly to the circuit to better protect the micro super capacitor.

The invention discloses a half-bridge D-Mode GaN drive dead zone control detection circuit, which comprises a bias generation circuit, a common half-bridge D-Mode GaN circuit and a half-bridge D-Mode GaN drive dead zone time detection circuit, and is characterized in that the bias generation circuit provides bias voltage and bias current for subsequent circuits, the common half-bridge D-Mode GaN circuit adopts an LLC resonant converter circuit topological structure, and the common half-bridge D-Mode GaN drive dead zone time detection circuit adopts an LLC resonant converter circuit topological structure; the input end of the half-bridge D-Mode GaN driving dead-zone time detection circuit is connected with the source end of an L-DMOS at the lower part of D-Mode GaN to detect the change of the voltage of the source end of the L-DMOS, and the input end of the Schmidt trigger circuit is connected with the output end of the half-bridge D-Mode GaN driving dead-zone time detection circuit to adjust the voltage threshold when the dead-zone time comes and have certain voltage margin to resist noise interference; through accurate capture of the dead zone time, excellent detection precision can be maintained even in a complex and changeable working condition environment, and the method has accurate dead zone time detection capability and anti-interference capability.

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 utility model discloses a photoelectric sensor pulse modulation circuit which comprises an RC charging and discharging circuit, a Schmitt trigger U2 and a photoelectric device driving circuit. The Schmitt trigger U2 is connected with the RC charging and discharging circuit, the Schmitt trigger U2 and the RC charging and discharging circuit are connected with the photoelectric device driving circuit, the RC charging and discharging circuit is used for generating oscillation time, and the photoelectric device driving circuit is used for driving a large-current device to operate. According to the utility model, the RC charging and discharging circuit is used for generating oscillation time; the arranged Schmitt trigger U2 is a NOT gate circuit and can realize level inversion; the photoelectric device driving circuit can be used for driving large-current devices such as a photoelectric sensor and the like; by means of the arrangement, the frequency and duty ratio modulation function of the photoelectric sensor is achieved, and frequency modulation is stable.

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.