61 results about "Resistive feedback" patented technology

The invention relates to the technical field of LDO circuits, and discloses a dynamic zero compensation circuit which comprises an error amplifier, a zero compensation module, a power tube module and a dynamic bias voltage generation module. The input end of the error amplifier receives a reference voltage Vref and a resistance feedback voltage FB, and the output end of the error amplifier provides a control voltage for the power tube module; the zero point compensation module is electrically connected with the output end of the error amplifier, the dynamic bias voltage generation module generates dynamic bias voltage through dynamic current of the mirror image power tube module and feeds back the dynamic bias voltage to the zero point compensation module to adjust a compensated zero point in real time, and the dynamic bias voltage generation module tracks the power tube current to compensate the zero point. The zero frequency of the zero compensation module is adjusted in real time, and a compensation zero point is dynamically matched with output pole drift, so that the phase margin of a loop in a wide load range is sufficient, the oscillation risk is effectively suppressed, and stable work of the LDO circuit is guaranteed.

The invention relates to the field of electrochemical signal processing, and particularly discloses a wearable detection circuit for an electrochemical oxygen sensor, comprising: a transimpedance amplification module comprising an analog switch S1 and at least two feedback resistors with different resistance values, the feedback resistors being connected in parallel, the analog switch S1 being connected in series with the feedback resistors, the control circuit is used for controlling a feedback resistor connected to the circuit and outputting a first voltage signal; the active low-pass filtering module is used for filtering the first voltage signal and filtering thermal noise, power frequency interference and motion artifact noise to obtain a second voltage signal; the temperature calibration module is used for collecting temperature information; the microcontroller is used for providing driving voltage for the transimpedance amplification module and the active low-pass filtering module and receiving the temperature information and the second voltage signal; the microcontroller is used for receiving the second voltage signal and comparing the second voltage signal with a preset value. The technical scheme of the invention is high in precision and low in power consumption, and can reduce environmental interference.

The invention discloses an LDO circuit with low static power consumption. The LDO circuit mainly solves the problem that an existing LDO circuit is poor in stability under the condition that static current is reduced. The circuit comprises a bias circuit, an error amplifier, a transconductance linear ring, a CLASS-AB output stage, a resistance feedback network and an output end load which are connected in sequence. And the error amplifier is also connected with the resistance feedback network. According to the LDO structure, the CLASS-AB output stage is adopted, the two adjusting tubes are used, and the LDO can meet the charging and discharging requirements at the same time. According to the LDO structure, the transconductance linear ring bias CLASS-AB output stage is adopted, and it can be guaranteed that the quiescent current is reduced, and meanwhile fast load response is achieved. According to the LDO structure, the output end of the error amplifier is set as a main pole, a parallel negative feedback mechanism is ingeniously introduced to the output end, the output impedance of the LDO is reduced, the pole of the output end of the LDO is pushed to high frequency, and the stability of a loop can be guaranteed while the LDO drives large capacitance and small resistance.

The embodiment of the utility model provides a low-dropout linear voltage regulator and a power supply management circuit, which are used for solving the technical problems of complex circuit structure and high power consumption in the technical scheme that the conventional low-dropout linear voltage regulator improves a power supply rejection ratio by copying input ripples at a grid electrode of a power transistor. The low dropout linear regulator comprises an input voltage end, an output voltage end, a band-gap reference source, a resistance feedback network, an error amplifier, an impedance attenuation buffer and a power transistor. According to the differential pressure linear voltage regulator, the impedance attenuation buffer which is simple in circuit structure and low in power consumption is adopted, high-frequency ripple waves, low-frequency ripple waves and noise in control signals are suppressed in a forward attenuation mode, smooth processing of the control signals is achieved, and low ripple waves and high precision of output voltage are ensured. The low-dropout linear regulator is simple in circuit structure and low in power consumption, the power consumption is reduced, the value of the power supply rejection ratio (PSRR) of the low-dropout linear regulator is remarkably increased within the broadband range, and the suppression capacity of power supply noise is enhanced.

The invention provides a wide-range high-precision capacitance acquisition circuit and a control method, and relates to the technical field of airborne analog quantity acquisition, the circuit comprises a to-be-measured capacitor Cx, a first alternating current proportional amplification circuit and a second alternating current proportional amplification circuit, the to-be-measured capacitor Cx is connected with the first alternating current proportional amplification circuit through a switch S1, and the to-be-measured capacitor Cx is connected with the second alternating current proportional amplification circuit through a switch S2; the capacitor Cx to be tested is connected with the second alternating-current proportional amplification circuit through the switch S2; the first alternating-current proportional amplification circuit and the second alternating-current proportional amplification circuit respectively comprise a feedback resistor, a feedback capacitor and an operational amplifier which are connected in parallel; the switch S1 and the switch S2 are mutually exclusive, and the capacitance value of a feedback capacitor of the second alternating-current proportional amplifying circuit is at least five times of the capacitance value of the feedback capacitor of the first alternating-current proportional amplifying circuit. The requirement for expanding the range of the to-be-measured capacitor is met while the capacitance acquisition precision is guaranteed, the capacitance acquisition range is expanded, the generalization level is improved, and the method is particularly suitable for the field of airborne fuel oil liquid level measurement.

This invention provides a wideband linear regulator circuit with high power supply noise suppression, comprising: a bandgap reference voltage source, a charge pump, an error amplifier, a summing module, a segmented FFRC compensation module, a buffer, an N-type power transistor MN, and a resistor feedback network; the bandgap reference voltage source generates a reference voltage; the charge pump performs voltage conversion and supplies power to the corresponding modules; the error amplifier compares the reference voltage with the sampled voltage output from the resistor feedback network, amplifies the comparison result, and outputs it to the summing module; the segmented FFRC compensation module generates a compensation voltage based on changes in load current and outputs the compensation voltage to the summing module; the summing module combines the compensation voltage with the amplified comparison result; and the buffer drives the N-type power transistor MN to suppress power supply noise entering the linear regulator circuit based on the compensation voltage, thereby achieving adaptive power supply noise suppression according to changes in load current.

The utility model provides a built-in IEPE circuit used for a piezoelectric type shock wave pressure sensor, comprising a high gain amplifier, a feedback capacitor and a constant current source, the high gain amplifier is composed of an N channel enhanced field effect transistor, a P channel enhanced field effect transistor, a resistor R1, a resistor R2, a feedback resistor R3 and a resistor R4, the two ends of the high-gain amplifier are connected with the constant current source, the positive electrode of the constant current source is an output end, and the constant current source is connected to the P-channel enhanced field effect transistor; the piezoelectric sensor sensitive element is connected with the input end and receives a charge signal generated by the piezoelectric sensor sensitive element through the input end; the feedback capacitor is installed between the input end and the output end to form negative feedback to form a charge amplifying circuit, a small number of electronic components are used for constructing a complete IEPE circuit, and the charge amplifying circuit has the advantages of being high in integration level, small in size and high in anti-interference capacity and can be integrated in a sensor to amplify charge signals.

The invention belongs to the technical field of wireless optical communication, and particularly relates to a high-speed high-power laser diode driving circuit and a wireless optical communication assembly.The high-speed high-power laser diode driving circuit comprises an LDMOS device, and a grid electrode of the LDMOS device is connected with a feedback resistor R4, a divider resistor R3 and a divider resistor R7; the feedback resistor R4 is connected with a coupling capacitor C4 for accessing a signal, the divider resistor R3 is connected with a power supply Vcc, and the divider resistor R7 is grounded; the drain electrode of the LDMOS device is connected with the negative electrode of the laser diode, the positive electrode of the laser diode is connected with the current-limiting resistor R1, the current-limiting resistor R1 is connected with the filter capacitor C1 and the filter capacitor C2, the filter capacitor C1 and the filter capacitor C2 are grounded, the other ends of the current-limiting resistor R1, the filter capacitor C1 and the filter capacitor C2 are connected with the filter magnetic bead L1, and the other end of the filter magnetic bead L1 is connected with the power supply Vss; the source electrode of the LDMOS device is connected with a feedback resistor R8, the other end of the feedback resistor R8 is grounded, and the driving circuit is arranged in the assembly through a printed board. According to the invention, high-speed and high-power wireless optical communication can be realized.

The application provides a common-mode feedback circuit with a level conversion function, comprising an amplifier output stage, a resistive common-mode feedback circuit and an amplifier common-mode feedback circuit, the amplifier output stage comprising a first current source I1, a second current source I2, a tail current source I3, input pair tubes M1 and M2 and a common-mode adjusting tube M3, the resistive common-mode feedback circuit comprising a first resistor R1 and a second resistor R2, and the amplifier common-mode feedback circuit comprising a third resistor R3, a fourth resistor R4 and a first operational amplifier AMP1, V OP and V ON The input ports of the resistive common-mode feedback circuit and the amplifier common-mode feedback circuit are commonly connected, for detecting the common-mode voltage and adjusting the common-mode adjusting tube at the same time. The scheme introduces the fast response advantage of the amplifier feedback on the basis of the resistive feedback, realizes the accurate control and dynamic adjustment of the common-mode level, and makes the output common-mode voltage be flexibly set by integrating the level conversion function in the feedback loop, so that the transient response speed of the system is significantly improved.

The application discloses a kind of ultra-low power consumption low dropout linear voltage stabilizing circuit, it is related to integrated circuit design field, including band gap reference circuit, operational amplifier circuit, feedback circuit;The band gap reference circuit is used to generate reference voltage VREF, feedback circuit is used to generate different feedback voltage FB, and operational amplifier circuit is used to generate stable output voltage VOUT according to reference voltage VREF and feedback voltage FB;Feedback circuit includes diode connection structure;Diode connection structure includes several diode connection structure PMOS tubes in series, for changing the voltage value of each PMOS tube by changing the number of series PMOS tubes.This application replaces the resistance feedback used by traditional LDO, and uses MOS tube voltage division feedback connected by diode.The structure has the characteristics of ultra-low power consumption and small area, and the size of output voltage VOUT can be adjusted by adjusting the number of feedback MOS tubes.

The utility model relates to the technical field of switch power supply management systems, in particular to a differential high-precision voltage acquisition circuit and a switch thereof, which comprises an operational amplifier U4.2, a sampling resistor R1, a feedback resistor R13, a filter capacitor C3, a filter capacitor C4 and a filter capacitor C5, the other end of the sampling resistor R1 is connected with the in-phase input end of the operational amplifier U4.2, and the other end of the feedback resistor R13 is connected with the in-phase input end of the operational amplifier U4.2. One end of the feedback resistor R13 is connected with the inverted input end of the operational amplifier U4.2, and the sampling resistor R1 and the feedback resistor R13 are both adjustable resistors. When the circuit works, current passes through the sampling resistor R1, a voltage signal in direct proportion to the current is generated on the sampling resistor R1, the voltage signal is sent to the input end of the operational amplifier U4.2 and is output after being amplified, and the amplified signal is processed by the filter capacitor C5, so that high-frequency interference components are removed, and the signal is smoother and more stable.

The application relates to an LDO circuit for an AC-DC power supply controller module in a power electronic system, comprising a band-gap reference circuit, a dynamic bias error amplifier, a dynamic bias control circuit, a bias circuit, a multiple protection circuit and a power tube, a feedback resistor R1 and a feedback resistor R2. In addition to a fixed bias current I B , the bias current of the dynamic bias error amplifier also has an additional dynamic bias current I AB . The dynamic bias control circuit detects the load current change and generates a bias control signal V ctrl to control the dynamic bias current I AB for changing the bias current of the dynamic bias error amplifier and changing the transient response speed. On the basis of the prior art, the application first adopts the dynamic bias technology to increase the bias current under heavy load and improve the response speed of the LDO circuit; in addition, the multiple protection circuit is adopted to increase the reliability of the LDO circuit.

A delta sigma modulator includes: an integrator that integrates differences between input signals and output signals of the delta sigma modulator; and a clocked comparator that outputs the output signals that are results of comparison between an output of the integrator and a threshold, at a timing synchronized with a clock signal. The integrator includes an operational amplifier, input resistors, feedback capacitors, and compensation inductors.

The invention provides a Q-value-variable bisecond-order filter based on resistance feedback, and belongs to the technical field of radio frequency receivers. Differential source followers are adopted to form a second-order filtering unit, a cross coupling resistance network is introduced between differential signal nodes, and a novel method for adjusting the quality factor of the filter is provided. The quality factor Q of the filter can be independently adjusted through an equivalent feedback path formed by the cross coupling resistor in a differential working state. In addition, a parasitic zero offset method is provided, negative capacitance is achieved by cross-coupling two capacitors between differential input and output nodes, and the stop-band suppression performance is improved. On the premise that the power consumption of the filter is not increased, the variable Q value and high linearity are realized, and the structure is suitable for a radio frequency receiver system and has a good engineering application prospect.

The utility model discloses an isolation amplifier, and belongs to the technical field of amplifiers. The isolation amplifier comprises a four-path amplifier, a single-path amplifier, a first resistor, a feedback resistor, a first photoelectric coupling element and a second photoelectric coupling element, an inverted input end of the four-way amplifier is connected with a bias regulator at a high-voltage side and is connected with a signal input end through a first resistor, an in-phase input end of the four-way amplifier is connected to an inverted input end of the four-way amplifier through a photosensitive element of a second photoelectric coupling element, and an output end of the four-way amplifier is connected with a light-emitting element of the second photoelectric coupling element; the inverting input end of the single-path amplifier is connected with a bias regulator at a low-voltage side, and the non-inverting input end of the single-path amplifier is connected to the inverting input end of the single-path amplifier through a photosensitive element of the first photoelectric coupling element; the inverted input end of the single-path amplifier is connected to the output end of the single-path amplifier through a feedback resistor. According to the utility model, the problems of non-linear distortion, limited common-mode rejection capability and the like generally existing in multiple channels of the traditional isolation amplifier in the prior art are effectively solved.

The invention discloses a continuous voltage signal segmented sampling circuit comprising an analog switch module used for switching different sampling segments; the reference voltage source is electrically connected with the analog switch module, and a resistance feedback network of the reference voltage source is adjusted through switching of an analog switch path, so that different reference voltage values are generated; the reference voltage module is electrically connected with the reference voltage source, and the reference voltage module is used for generating segmented reference voltage; the subtraction module is used for receiving the continuous voltage signal to be sampled, is electrically connected with the reference voltage module and is used for generating a voltage difference value between the continuous voltage signal to be sampled and the segmented reference voltage under different segments; and the proportional amplification module is used for amplifying the voltage difference value and then outputting the amplified voltage difference value and is electrically connected with the subtraction operation module. According to the invention, the problem that sampling of continuous voltage signals in a high-noise environment is easily interfered in the prior art is solved.

The utility model provides an exercise training detection device. The exercise training detection equipment comprises a sweat detection module, the sweat detection module comprises a plurality of working electrodes, signals of the working electrodes are converted into differential signals through multiple signal conversion circuits, one signal conversion circuit comprises an operational amplifier U16A, the inverted input end of the operational amplifier U16A is connected with a first working electrode, and the inverted input end of the operational amplifier U16A is connected with a second working electrode. The in-phase input end of the operational amplifier U16A is connected with a first bias voltage, the output end of the operational amplifier U16A is in feedback connection with the inverted input end of the operational amplifier U16A through a resistor R1, and the output end of the operational amplifier U16A is a first differential signal corresponding to the first working electrode; and the inverted input end of the operational amplifier U16A is a second differential signal corresponding to the first working electrode. According to the invention, the detection precision of the existing exercise training detection equipment can be improved.

To provide a semiconductor integrated circuit device capable of improving the gain accuracy of a resistance feedback type amplifier circuit and suppressing the increase of the layout area of a resistor.SOLUTION: The semiconductor IC device (13) includes a resistance feedback amplifier circuit including first to sixth resistors and an amplifier (A2). A part of the first resistance (R3), a part of the second resistance (R51), a part of the fourth resistance (R4), and a part of the fifth resistance (R61) are arranged in a first W11 (well) configured to have the same potential as a first voltage (AM). The remaining part of the first resistor, the remaining part of the second resistor, the remaining part of the fourth resistor, and the remaining part of the fifth resistor are disposed in a second W12 configured to have the same potential as a second voltage. The third resistors (R52, R53) and the sixth resistors (R62, R63) are arranged in a third well (W13) configured to be at the same potential as the third voltage (VREF).SELECTED DRAWING: Figure 7

The invention relates to a programmable amplifying circuit, a programmable amplifier and electronic equipment. The programmable amplification circuit comprises a plurality of PGA subunits which are cascaded in sequence; the first resistance feedback circuit and the second resistance feedback circuit of the PGA subunit are both used for adjusting the gain of the PGA subunit; under the condition that the PGA subunit is the cascaded highest-level PGA subunit, the first input circuit of the PGA subunit is used for accessing a PGA input signal; under the condition that the PGA subunit is not the highest-level PGA subunit, the first input circuit of the PGA subunit is used for connecting an output signal of the previous-level PGA subunit to the input end of the operational amplifier of the PGA subunit; and under the condition that the PGA subunit is not the highest-level PGA subunit, the second input circuit is used for accessing the PGA input signal to the input end of the operational amplifier of the PGA subunit. According to the programmable amplifying circuit, power consumption and noise in a small gain state can be reduced, and linearity and stability of an amplifier are improved.

The utility model discloses an air conditioner which comprises a temperature detection circuit which is used for detecting the temperature of the position where a temperature sensor is located and comprises a voltage division circuit which comprises a thermistor of the temperature sensor, and the divided voltage output by the voltage division circuit changes along with the change of the resistance value of the thermistor; the in-phase input end of the operational amplifier receives the divided voltage, the anti-phase input end of the operational amplifier is grounded through a resistor, and the output end of the operational amplifier is fed back to the anti-phase input end of the operational amplifier through a change-over switch and a feedback resistor which are connected in parallel; and the controller is used for receiving the voltage signal output by the operational amplifier and outputting a control signal for controlling the switching switch to be switched off when the voltage signal output by the operational amplifier reaches the lower limit value of the threshold voltage. According to the utility model, the divided voltage can be amplified in a single-time or multi-time manner based on the magnitude of the divided voltage, and the temperature detection accuracy of the temperature sensor at low divided voltage is improved.

The invention provides a micro-current detection device and a gas chromatograph, the micro-current detection device comprises a transimpedance amplification circuit, the transimpedance amplification circuit comprises a current amplification circuit and a feedback resistor, the resistance value of the feedback resistor is greater than 100G omega, and the transimpedance amplification circuit is used for receiving a micro-current signal and generating a first voltage signal based on the micro-current signal; the analog-to-digital conversion circuit is connected with the voltage signal output end of the transimpedance amplification circuit and is used for receiving the first voltage signal and converting the first voltage signal into a first digital signal; the main control circuit is connected with the digital signal output end of the analog-to-digital conversion circuit and is used for receiving the first digital signal and filtering the first digital signal to obtain a second digital signal; the low-ripple power supply circuit is connected with the transimpedance amplification circuit, the analog-to-digital conversion circuit and the master control circuit and is used for providing low-ripple power supply voltage; and the upper computer is connected with the serial port output end of the main control circuit and is used for receiving the second digital signal and determining the current magnitude of the micro-current signal according to the second digital signal.

The invention discloses a jitter injection circuit for comparator foreground calibration. The jitter injection circuit comprises a gain amplifier circuit, a resistance feedback network circuit, a current mirror circuit, a current selection switch circuit, a shunt resistor and a resistor string circuit, wherein the gain amplifier circuit is respectively connected with the resistance feedback network circuit and the current mirror circuit; the resistance feedback network circuit, the current mirror circuit and the current selection switch circuit are respectively connected with the shunt resistor; and the resistor string circuit is respectively connected with the shunt resistor and the current selection switch circuit. According to the invention, accurate control of dither (jitter) injection amplitude is realized.

The present invention discloses a CMOS ultra-wideband low-noise amplifier, including an input-stage complementary common-source circuit, an intermediate-stage common-source negative feedback circuit, and an output-stage common-source buffer circuit. The present invention innovatively introduces resistance feedback, inductance peaking technology, source degeneration inductance technology, and pseudo-resistance structure on the basis of the complementary common-source stage, and combines the common-source negative feedback circuit, the common-source buffer circuit, and the current multiplexing technology, so that the overall circuit has a wide bandwidth while achieving good gain, noise figure, power consumption and other indicators. The present invention can operate in the 0.15-11GHz frequency band, covering the 5G low- and medium-frequency bands (450MHz-6GHz) and the IMT service in the 6GHz candidate frequency band (5925-7125MHz), and is also compatible with the UWB standard frequency band (3.1-10.6GHz).

The invention discloses a transimpedance amplifier and a deep sea heavy metal detection device. The transimpedance amplifier comprises a working electrode for generating input current, an integrator, a buffer, a feedback capacitor and a feedback resistor, the feedback capacitor is connected between the output end and the input end of the integrator; the feedback resistor is connected between the output end of the buffer and the input end of the integrator; the input end of the integrator is connected with the working electrode, and the integrator is used for amplifying input current and outputting first amplified voltage to the buffer; the buffer is used for amplifying the received first amplified voltage and outputting a second amplified voltage. The transimpedance amplifier provided by the invention is integrated with the on-chip electrode, so that the distance between the transimpedance amplifier and an electrochemical reaction tank can be shortened to hundreds of microns, the capacitance effect of electrochemical reaction is reduced, the noise level can be reduced, and quantitative detection of the concentration of trace heavy metals in deep sea is realized.

The invention discloses a ring oscillator circuit with low temperature drift and low voltage drift. The circuit comprises a reference current generation module, a current mirror module, an inverter chain module, a waveform shaping module, a voltage stabilizing module and a starting module. The reference current generation module outputs current with a monotonic temperature coefficient, and the current mirror image module copies the current in proportion and provides tail current for the inverter chain module. The voltage stabilizing module ensures that the power supply voltage of the phase inverter chain module is kept stable when the power supply voltage changes, the phase inverter chain module generates a periodic oscillation signal, and the waveform shaping module shapes the oscillation signal into a clock signal with a voltage amplitude. The starting module is used for providing starting current for the reference current generation module. Through a temperature coefficient and resistance feedback network compensation method, the interference of temperature and power supply voltage on clock signal frequency can be reduced, so that the stability of the system is improved.

The invention discloses a high-frequency high-PSRR LDO circuit based on current sampling feedback, and belongs to the technical field of integrated circuits. The circuit comprises a first transconductance operational amplifier, a second transconductance operational amplifier, an I-V conversion circuit, a power tube, a mirror image power tube, a sampling resistor RS, a resistance feedback network and a load end. The first transconductance operational amplifier amplifies the difference value between the standard reference voltage and the feedback voltage and outputs current; the second transconductance operational amplifier detects the voltage difference between the two ends of the sampling resistor RS and amplifies the output current; the I-V conversion circuit converts the two currents into voltage signals to control grid voltages of the power tube and the mirror image power tube; the mirror image power tube samples output current of the power tube in equal proportion, and the output current is converted into voltage through a sampling resistor RS and fed back to the second transconductance operational amplifier; the resistance feedback network divides the output voltage to generate a feedback voltage. A series negative feedback structure is formed through current sampling feedback, and equivalent impedance from a power supply to output is improved, so that the high-frequency band power supply rejection ratio is remarkably enhanced, the problems that a traditional LDO is poor in high-frequency PSRR, a circuit is complex and the area is large are solved, and broadband high PSRR is achieved.

The invention discloses an ultralow-power-consumption low-dropout linear voltage stabilizing circuit, which relates to the field of integrated circuit design and comprises a band-gap reference circuit, an operational amplifier circuit and a feedback circuit. The band-gap reference circuit is used for generating a reference voltage VREF, the feedback circuit is used for generating different feedback voltages FB, and the operational amplifier circuit is used for generating a stable output voltage VOUT according to the reference voltage VREF and the feedback voltages FB; the feedback circuit comprises a diode connection structure; the diode connection structure comprises a plurality of PMOS (P-channel Metal Oxide Semiconductor) tubes which are connected in series and are in diode connection, and is used for changing the partial voltage value of each PMOS tube by changing the number of the PMOS tubes which are connected in series. Resistance feedback used by a traditional LDO is replaced, and voltage division feedback is achieved through an MOS tube connected with a diode. The structure has the characteristics of ultra-low power consumption and small area, and meanwhile, the size of the output voltage VOUT can be adjusted according to the number of the feedback MOS tubes.

The present invention discloses a transimpedance amplifier and a deep-sea heavy metal detection device. The transimpedance amplifier includes: a working electrode for generating an input current, an integrator, a buffer, a feedback capacitor, and a feedback resistor; the feedback capacitor is connected between the output end and the input end of the integrator; the feedback resistor is connected between the output end of the buffer and the input end of the integrator; the input end of the integrator is connected to the working electrode, and the integrator is used to amplify the input current and output a first amplified voltage to the buffer; the buffer is used to amplify the received first amplified voltage and output a second amplified voltage. The transimpedance amplifier provided by the present invention integrates an on-chip electrode, so that the distance between the transimpedance amplifier and the electrochemical reaction cell can be reduced to hundreds of micrometers, reducing the capacitive effect of the electrochemical reaction, reducing the noise level, and realizing the quantitative detection of trace heavy metal concentration in the deep sea.

The utility model provides a high-side switch overcurrent protection circuit, which comprises a switch control circuit, a drive circuit, a sampling resistor, a feedback circuit and a hiccup control circuit, the hiccup control circuit comprises a capacitor C2 and a resistor R8, one end of the capacitor C2 is connected to a node of the feedback circuit, and the other end of the capacitor C2 is connected with the resistor R8 to form a t1 delay circuit and then is grounded. The scheme that the capacitor C2 is added in the overcurrent protection circuit is adopted, the C2 is matched with the resistor R8 and the resistor R4, so that the hiccup period is greatly adjusted, the temperature influence is reduced, meanwhile, the hiccup period is adjusted by using the time constants of the resistor and the capacitor, the dependence on the characteristics of the transistor is reduced, and the reliability of the overcurrent protection circuit is improved. Therefore, the current protection interval can be basically stabilized at about 50ms at different temperatures, and the stability and the reliability of the circuit are remarkably improved.