35 results about "Resistive feedback" patented technology

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.

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 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.

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.

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 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 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.

Seismocardiographic reading device (120) comprising: - two charge amplifiers (210, 220) configured to receive an input from an accelerometer (110) and each to generate a first output signal, wherein the accelerometer (110) comprises two mechanical capacitors connected in series, the mechanical capacitors changing their capacitance according to acceleration pulses, wherein two feedback loops via respective switches (330, 340) in the reading device are connected via a differential amplifier, and - the differential amplifier (230) configured to receive the first output signals and amplify a difference between the first output signals to generate two second output signals, wherein, when the switches (330, 340) are open, a resistance of the switches (330,340) in the locked state, a resistance feedback is suppressed and an active high-pass filter functionality is generated, wherein the active high-pass filter functionality suppresses a constant acceleration component in the input from the accelerometer (110).

The utility model belongs to the technical field of vehicle driving circuit protection, and particularly relates to a power tube overcurrent protection circuit based on a voltage monitoring reset chip, which comprises a power tube driving circuit, an overcurrent protection circuit and a protection delay recovery circuit. The power tube drive circuit is composed of a resistor R3, a drive circuit, a power tube Q1, a fly-wheel diode D1 and a load inductor L1. The overcurrent protection circuit is composed of a voltage comparator U1, a resistor R1, a resistor R2, a feedback resistor R4 and a sampling resistor R5. The protection delay recovery circuit is composed of a voltage monitoring reset chip U2 and a resistor R6, and has a period of delay recovery time after overcurrent protection, so that a power tube in the drive circuit has enough heat dissipation time, and the probability of device damage is reduced, thereby ensuring the reliability of the drive circuit. In addition, the circuit is simple, and the cost is low.

Random sequence generators utilizing one or more noise generators that include an inverter chain with at least one input stage inverter configured with resistive feedback and additional inverters configured in series with the at least one input stage inverter, wherein an output of the inverter chain is coupled to a bit sequence generator.

This invention discloses a high-gain transimpedance amplifier based on low-resistance feedback, belonging to the field of transimpedance amplifier technology for photoelectric sensors. It includes: a first resistor voltage divider bias circuit, a second resistor voltage divider bias circuit, a photodiode, a first feedback resistor, a second feedback resistor, and an operational amplifier. The operational amplifier is connected to the first resistor voltage divider bias circuit, the second resistor voltage divider bias circuit is connected to both the first and second feedback resistors, and the operational amplifier is connected to the photodiode. The first feedback resistor is connected to the operational amplifier, and the second feedback resistor is also connected to the operational amplifier. This invention provides the same voltage as the non-inverting input of the operational amplifier through the first feedback resistor. A voltage difference exists between the two input terminals of the operational amplifier, and the current is output through the transconductance effect of the operational amplifier. This enables the high-gain transimpedance amplifier to achieve high gain, reduces the total resistance of the feedback resistors, shrinks the overall layout area of ​​the transimpedance amplifier, and improves the circuit integration.

The application discloses a voltage stabilizer, a chip and an electronic device. The voltage stabilizer comprises an error amplifier circuit, a pole compensation circuit, a power tube, a resistance feedback network and a compensation capacitor. The resistance feedback network is used for sampling an output voltage of a voltage stabilizing output end, adjusting the sampled voltage, and outputting a feedback voltage to a negative input end of the error amplifier circuit. The error amplifier circuit is used for amplifying a difference between a reference voltage and the feedback voltage, so that the reference voltage and the feedback voltage are equal, and the error amplifier circuit output becomes a main pole in cooperation with the compensation capacitor. The pole compensation circuit is used for weakening an output impedance corresponding to the voltage stabilizing output end, so that an output pole becomes a secondary pole. A drain of the power tube is used as the voltage stabilizing output end for voltage stabilizing output. The application can improve the robustness of the voltage stabilizer.

The application relates to a low-dropout (LDO) circuit without external capacitor, which comprises a band-gap reference circuit, an error amplifier (EA), a buffer stage composed of a PMOS tube M1 and a PMOS tube M2, a power output stage composed of a power PMOS tube M0, a feedback resistor R1, a feedback resistor R2 and a compensation device, a substrate modulation amplifier and a protection circuit. The low-dropout (LDO) circuit without external capacitor provided by the application, on the basis of the prior art, on one hand, adopts a power adjustment tube substrate modulation technology to reduce the opening voltage of the power adjustment tube, thereby achieving the target of reducing the LDO voltage difference; on the other hand, adopts multiple protection circuits to increase the reliability of the LDO circuit.

The application belongs to the technical field of integrated circuits, and particularly relates to a low-dropout linear voltage regulator with switchable output modes, which comprises a SET network, an EA network and a feedback network, the EA network comprises a first error amplifier circuit, a second error amplifier circuit and a third error amplifier circuit, the feedback network comprises a fixed feedback resistor network and an adjustable resistor feedback network, and when the SET network selects the first error amplifier circuit or the second error amplifier circuit and the third error amplifier circuit, a loop of the low-dropout linear voltage regulator is formed with the feedback circuit. The dual-mode switchable output device provided by the application can realize the free switching of the fixed and adjustable output working modes, and the switching between the fixed output and the adjustable output can be realized by operating a switching switch, that is, the one-to-many working mode is realized, which brings great convenience to use and saves the cost of the separate design of the fixed and adjustable output power supplies.

The application provides a charge pump power supply system with controllable high-voltage output, and belongs to the technical field of power management.The charge pump power supply system introduces a resistance feedback modulation module and a digital control circuit matched with the resistance feedback modulation module on the basis of a conventional charge circuit, utilizes the switching characteristics of a transmission gate to accurately control the size of output feedback, and then controls the pulse width variation of oscillation of an oscillator to achieve the purpose of controlling output voltage, simplifies the modulation circuit, improves the integration of the charge pump modulation circuit, greatly reduces the overall power consumption on the basis of maintaining the performance and functions of the charge pump.The application improves the controllability of the charge pump power supply circuit and enriches the application mode of the charge pump circuit.

The application discloses a low quiescent current LDO circuit, which mainly solves the problem of poor stability of the existing LDO circuit in the case of reducing the quiescent current. The circuit comprises a bias circuit, an error amplifier, a transconductance linear loop, a CLASS-AB output stage, a resistance feedback network and an output load which are connected in sequence; the error amplifier is further connected with the resistance feedback network. The LDO structure of the application adopts the CLASS-AB output stage, uses two adjusting tubes, and can make the LDO simultaneously realize the charging and discharging requirements. The LDO structure of the application adopts the transconductance linear loop to bias the CLASS-AB output stage, which can ensure that the quiescent current is reduced while the load response is fast. The output end of the error amplifier is set as the main pole in the LDO structure, a parallel negative feedback mechanism is ingeniously introduced at the output end, the LDO output impedance is reduced, the pole of the LDO output end is pushed to high frequency, and the LDO can drive the large capacitance and small resistance while ensuring the loop stability.

This invention belongs to the field of integrated circuit technology, specifically relating to a high power supply rejection ratio (PSRR) linear regulator without external capacitors. It includes: a resistive feedback network, an error amplifier, a Miller capacitor C1, NMOS transistors MN1 and MN2, and PMOS transistors MP1, MP2, and MP3. This invention improves the PSRR of the LDO by using the output voltage to power the error amplifier. It enhances circuit stability through two feedback loops and Miller compensation technology, making it suitable for current on-chip integrated circuits. Compared to traditional architectures, it can improve the PSRR by 20dB, demonstrating promising application prospects.

The utility model provides a signal acquisition interface circuit for a nanometer material gas sensor, and belongs to the technical field of signal acquisition. The problem that a signal acquisition circuit of an existing nano material gas sensor is low in precision and reliability is solved. Comprising at least one signal acquisition circuit, the signal acquisition circuit is connected with a microcontroller through an ADC circuit, the microcontroller is further connected with a display module and a communication interface through wires, the signal acquisition circuit adopts a high-resistance negative feedback I / V amplification circuit, and the high-resistance negative feedback I / V amplification circuit comprises a COMS operational amplifier and a feedback resistor. The feedback resistor is connected between the inverting input end and the output end of the COMS operational amplifier, and the in-phase input end of the COMS operational amplifier is grounded; the high-precision output resistance acquisition device is applied to high-precision output resistance acquisition of the nano-material gas sensor.

The invention relates to the technical field of LDO circuits, in particular to a novel super source following LDO architecture with a current limiting function. Comprising a voltage reference, an error amplifier, a super source follower with a current limiting function, a power regulation tube MP and a resistance feedback network, the error amplifier amplifies the error between the output reference voltage from the voltage reference and the feedback voltage from the resistance feedback network, then the error is transmitted to the grid electrode of the power adjusting tube MP through the super source follower, and then the LDO output voltage is adjusted through the change of the output current of the power adjusting tube MP. A super source follower LDO framework with a current limiting function is adopted, the source end of an NMOS tube in a super source follower is connected with a current mirror, the super source follower is used for pushing a grid electrode pole of a power tube farther, the current limiting function is completed only through a current sampling tube and a mirror image tube, the chip area and power consumption are greatly reduced, and reliability is improved.

The invention discloses an automatic test method for a multi-channel high-precision bias current operational amplifier chip, and the method comprises the steps: connecting the in-phase input ends and reverse input ends of two to-be-tested operational amplifiers CHA and CHB in a to-be-tested chip with the in-phase input end of an auxiliary operational amplifier and a feedback resistor through four relays respectively; the other end of the feedback resistor is connected with the output end of the auxiliary operational amplifier; the reverse input end of the auxiliary operational amplifier is grounded; collecting an output value VM3 of the auxiliary operational amplifier and an output value VM4 of the auxiliary operational amplifier after the auxiliary operational amplifier is connected to the two operational amplifiers CHA and CHB to be tested; and the bias current IB is solved through the following formula, and automatic testing of the to-be-tested chip is achieved. 50 samples to be tested are tested and verified, all chips pass the test, and the test time is shortened by about 600ms and is optimized by about 33%.

An amplifier apparatus is provided that includes a first amplifier connected to receive an input voltage. The first amplifier outputs an internal voltage. The structure further includes a second amplifier having an input node connected to receive the internal voltage and an output node that outputs an output voltage. A resistive feedback loop is connected to the input node and the output node of the second amplifier. A first cross-coupled bandwidth boosting stage is connected to the input node of the second amplifier and a second cross-coupled bandwidth boosting stage is connected to the output node of the second amplifier. The cross-coupled bandwidth boosting stages form a distributed differential positive feedback structure.