42 results about "Input resistance" patented technology

The invention discloses a single-port detection resonator resonant frequency on-line real-time measurement system for an MEMS gyroscope, and the system comprises a closed-loop drive circuit which is used for driving a resonator to resonate and outputting a drive detection signal; the first C / V conversion circuit converts the current into a detection voltage signal, and the on-off of the first C / V conversion circuit and the negative resistance circuit is controlled by a voltage control switch; the negative resistance circuit enables the equivalent input resistance of the first C / V conversion circuit to be a negative value so as to generate positive damping feedback force on the detection resonator; the multiplier is used for carrying out multiplication demodulation on the detection voltage signal and the driving detection signal, and the angular velocity of the MEMS gyroscope is output after the signals are filtered by the low-pass filter; the upper computer controls the on-off of the voltage control switch, the frequency fd and the frequency fs are calculated through fast Fourier transform by driving the detection signal and the detection voltage signal respectively, the frequency difference is obtained by solving the difference, and the resonant frequency of the single-port detection resonator is measured on the premise that the work of the MEMS gyroscope is not affected.

The invention discloses a non-contact real-time current monitoring device, which comprises a magnetic field induction sub-device and an analog signal processing sub-device, and is characterized in that the signal output end of the magnetic field induction sub-device is electrically connected with the signal input end of the analog signal processing sub-device; the analog signal processing sub-device comprises an impedance matching sub-module, a passive RC pre-compensation sub-module and an active integration sub-module which are cascaded in sequence; the impedance matching sub-module comprises an input matching resistor and an output matching resistor; the passive RC pre-compensation sub-module comprises a resistor and a capacitor, the resistor and the capacitor form an RC loop, and the passive RC pre-compensation sub-module is cascaded between the impedance matching sub-module and the active integration sub-module; the active integration sub-module comprises an operational amplifier, an input resistor, an integration capacitor and a feedback resistor. The device provided by the invention can directly output an analog voltage signal which is homologous with a measured current waveform through an exquisite collaborative design.

This application relates to the field of operational amplifier circuit technology, and more particularly to an inverting operational amplifier circuit for eliminating input offset voltage. It includes an input resistor for receiving an input voltage; an operational amplifier for inverting and amplifying the input voltage; an output resistor section connected in series between the output terminal of the operational amplifier and the input resistor, the output resistor section being composed of multiple output resistors connected in series; multiple current sources connected to nodes between the various output resistors of the output resistor section, the current sources being used to compensate for the output offset voltage caused by the input offset voltage of the operational amplifier; and a digital code input section for adjusting the current values ​​of the current sources; wherein the voltage value of the output offset voltage is determined based on the current values ​​of the multiple current sources and the corresponding resistance values ​​of the output resistor section. Using this application is advantageous for canceling the output offset voltage caused by the input offset voltage of the operational amplifier and appearing at the output terminal.

The application discloses a kind of complete non-volatile Boolean logic circuit based on 1T1R array and control method thereof, belong to microelectronic device technical field, for the logic value P and / or logic value Q of input is carried out logic operation;Wherein, the input resistance state of memristor M1 is determined by logic input Q, input voltage is fixed as-V0, the input voltage of memristor M2 is fixed as V1, the input voltage C on word line WL is determined by logic operation type and logic value Q, P;The input voltage D on source control end is determined by logic operation type, logic value P and voltage C, the resistance state of memristor M2 is as the output of calculation result;The application fully utilizes the switching characteristic of transistor in 1T1R structure on logic algorithm, by dynamically configuring the input voltage on word line WL and source control end, i.e., complete Boolean logic function can be realized in two steps, and non-volatile Boolean logic operation efficiency can be improved with less operation steps and fixed circuit topology.

The application provides a high-balance active balun circuit, which comprises an RF signal input port, a signal input matching stage, a single-end to differential circuit and an output load stage, wherein the signal input matching stage comprises a first transistor, a second transistor, an input resistor and an input inductor, and the single-end to differential circuit comprises a third transistor, a fourth transistor, a fifth transistor and a capacitor. The application does not need to waste chip area to make a complex matching circuit. When the circuit is connected in the front stage, the circuit will not cause the problem that power cannot be transmitted due to high-frequency reflection. The phase adjusting inductor is introduced into the circuit, and the frequency phase characteristics of the inductor are used to compensate the phase imbalance of the differential output. The bandwidth extension technology is used in the load, so that the phase shifter maintains the flatness of the gain in a wide frequency. Meanwhile, the two-stage cascade transistor is used to realize the single-end input to differential output gain stage architecture, which is more suitable for low-voltage application.

The utility model discloses a kind of multi-path protection signal control circuit, belong to the technical field of automation equipment protection circuit.The circuit is input by several protection sensor signals, and each signal is connected to N channel MOS field effect transistor through input resistance and load resistance, and MOS tube is connected to triode after cascading, and triode output end connects motor driver I O port, and 24V is simultaneously stabilized as 5V for sensor power supply using 78L05.The utility model solves the problem of insufficient motor controller I O port resources, high cost and low reliability in prior art, can be flexibly configured according to sensor type, reduces cost and assembly difficulty, and improves system reliability.

The invention discloses a rectification circuit and a displacement measurement method and a displacement measurement system based on the rectification circuit. Wherein the rectifying circuit comprises a first operational amplifier circuit and a second operational amplifier circuit, a first input resistor in the first operational amplifier circuit is connected with an inverted input end of a first operational amplifier, a first feedback resistor is connected with the first operational amplifier in parallel, a first diode is connected with the first operational amplifier in parallel, and a second diode is connected with the first operational amplifier in series; the second operational amplifier circuit is connected with the first operational amplifier circuit in series through a second input resistor, the input end of the second input resistor in the second operational amplifier circuit is connected with the positive electrode of a second diode, the output end of the second input resistor is connected with the inverted input end of a second operational amplifier, and a third input resistor is connected with the inverted input end of the second operational amplifier. The second feedback resistor is connected in parallel with the second operational amplifier. According to the invention, the problem of test precision caused by phase difference in a displacement measurement system based on the differential transformer is successfully solved.

A delta-sigma analog-to-digital converter is provided that includes a continuous-time integration stage having an input terminal coupled through a switch to an input resistor that in turn couples to an input signal node. A feedback digital-to-analog converter converts a digital output signal to form a feedback current that also couples to the input terminal. A controller switches the first switch responsive to a duty cycle of the feedback current.

The utility model provides an analog-to-digital converter which is used for transmitting collected analog signals to a master controller, and the master controller is provided with a first IO port and a second IO port. The analog-to-digital converter comprises a discharge assembly, an integral assembly and a comparison assembly, and the discharge assembly is connected with the first IO port and is used for being switched on or switched off under the control of an output signal of the first IO port. The integrating component comprises an integrator and an integrating capacitor connected in parallel between the output end and the inverted input end of the integrator; the in-phase input end of the integrator is connected with a collected analog signal, and the inverted input end of the integrator is grounded through an input resistor; two electrodes of the discharging assembly are connected in parallel with two ends of the integrating capacitor. The output end of the integrator is connected with the input end of the comparison assembly, the other input end of the comparison assembly is connected with reference voltage, and the output end of the comparison assembly inputs signals related to the collected analog signals to the master controller. Simple signal control and data transmission with the analog-to-digital converter are completed through two IO ports of the master controller.

A bias circuit configured to provide a differential voltage and a common-mode voltage. The bias circuit includes a differential circuit and a common-mode circuit. The differential circuit includes a first differential input resistor, a first differential output resistor, a second differential output resistor, and a second differential input resistor connected together in series, in that order, between first and second differential input terminals. A first differential output terminal is connected to a node between the first differential input resistor and the first differential output resistor; and a second differential output terminal is connected to a node between the second differential output resistor and the second differential input resistor. The common-mode circuit includes: a common-mode transistor has a conduction channel connected in series between: i) the node between the first differential output resistor and the second differential output resistor; and ii) a reference terminal; a common-mode resistor connected between: i) the node between the first differential output resistor and the second differential output resistor; and ii) a control terminal of the common-mode transistor; and a common-mode current source connected between the control terminal of the common-mode transistor and the reference terminal.

According to the enhanced high-electron-mobility transistor and the preparation method thereof provided by the invention, the P-type delta doping layer with higher doping concentration is arranged in the P-type gate structure, so that an electron barrier is formed in the P-type gate energy band structure, and in the working process of a device, the electron barrier can prevent electrons from flowing in the gate structure, so that electric leakage is reduced, and the reliability of the device is improved. Meanwhile, bombardment of electrons to gate metal is avoided, and gate reliability is improved; meanwhile, the delta doping layer can form hole potential wells in the P-type gate energy band structure one by one, and free flow of holes cannot be greatly influenced, so that the holes are freely injected into the device, and relatively low working on-resistance of the device is ensured; the inserted P-type delta doping layer can reduce the overall resistivity of the P-type gate structure to a certain extent, reduce the input resistance, and facilitate the improvement of the crystal quality of the overall P-type gate structure; and the P-type delta doping process can be compatible with the existing traditional epitaxial process equipment, and the process is simple and easy to implement.

The utility model discloses a current measuring device based on a Hall effect. The current measuring device comprises a Hall device, a power supply module, a signal processing module, a multi-gear sampling circuit module, a processing chip and a display module, the signal processing module transmits an amplified signal obtained after the voltage measurement value of the Hall device is processed by an operational amplifier to the multi-gear sampling circuit module and the processing chip; the multi-gear sampling circuit module comprises a plurality of groups of sampling circuits, each sampling circuit comprises an operational amplifier, each group of sampling circuit is provided with input resistors with different resistance values at the input end of the operational amplifier of the respective circuit, and amplified signals output by the sampling circuits are input to the processing chip for current calculation; the display module is connected with the processing chip and used for displaying current calculation results of the multiple sets of signals. Amplified signals input to the multi-gear sampling circuit module by the signal processing module are connected to one or more sets of sampling circuits. The power supply module comprises multiple groups of power voltage reduction modules and is used for outputting power supplies of different specifications.

A termination circuit of a receiver is provided. The termination circuit includes an input resistor, a capacitor, a first resistor, a second resistor, a third resistor and a bias signal generator. The input resistor is coupled between an input terminal of the termination circuit and a first reference voltage. The capacitor is coupled between a first node of the termination circuit and an output terminal of the termination circuit. The first resistor is coupled between the first node and a second node of the termination circuit. The second resistor is coupled between the second node and the output terminal. The third resistor is coupled between the second node and a control terminal of the termination circuit. In addition, the bias signal generator is coupled to the control terminal, and generates a control signal positively correlated with a second reference voltage to the control terminal.

Easily set the offset voltage of the post-amplifier. [Solution] The system includes a preamplifier 10 that obtains a preamplifier positive output vc and a preamplifier negative output vb according to the difference between the upper and lower voltages of a current sensing resistor R0, and a postamplifier 12 that has a positive input terminal to which the preamplifier positive output is input and a negative input terminal to which the preamplifier negative output is input, and obtains a postamplifier output vout. The postamplifier 12 is an input path to the positive input terminal. to The positive input resistor to be placed R4b And the negative input resistor where the input path to the negative input terminal is located. R4a And, post-amp output end The system includes a feedback resistor R5 positioned in the return path from the negative input terminal to the negative input terminal, and a resistor network connecting the positive input terminal to a reference power supply and ground, which supplies an offset voltage obtained by resistance division of the voltage of the reference power supply to the positive input terminal, and whose combined resistance value corresponds to the resistance value of the feedback resistor.

The invention provides an intelligent cathode protection data collector based on an analog switch, and belongs to the technical field of data collectors. The data acquisition unit comprises a voltage signal acquisition circuit, a current signal acquisition circuit, an ADC conversion chip, a dual-channel multiplexing analog switch and an MCU controller. Wherein the voltage signal acquisition circuit comprises four voltage detection circuits, and each voltage detection circuit comprises a first range change-over switch, a common input resistor, three voltage division branches, a common output resistor and a differential amplification circuit; the current signal acquisition circuit comprises a current sampling resistor network, a second range change-over switch and a differential amplification circuit; the dual-path multiplexing analog switch selectively accesses the acquired voltage and current detection signals to the ADC conversion chip; and the controller performs data calibration on the analog-to-digital conversion voltage and current detection values according to a preset precision calibration logic. According to the invention, the data acquisition precision under a wide current range is improved, and the cooperation and unification of wide-range acquisition and high-precision detection are realized.

The invention discloses a universal programmable piecewise linear function analog circuit, which relates to the technical field of electronic information engineering and comprises a judgment module, a selection module and an addition module. The judgment module comprises a plurality of judgment branches, each judgment branch comprises a comparator and a threshold voltage, the in-phase input end of the comparator is externally connected to an original input signal, and the inverted input end of the comparator is grounded through the threshold voltage; the selection module comprises controllable bias voltage and analog switches, the number of the analog switches is equal to that of the judgment branches, the control ends of the analog switches are connected to the output ends of the comparators in a one-to-one correspondence mode, and the input ends of all the analog switches are grounded through the controllable bias voltage; the addition module comprises an anti-phase summator and an input resistor, the input end of the anti-phase summator is connected to the output ends of all the analog switches, and meanwhile, the anti-phase summator is externally connected to an original input signal through the input resistor; and the output end of the anti-phase adder is used as circuit output. The method simulates a piecewise linear function, and has the characteristics of universality, online programming and easy expansion.

A differential amplifier circuit includes a basic differential amplifier circuit including an operational amplifier configured to amplify a potential difference between output ends of a first input resistor and a second input resistor, a feedback resistor connected to the output end of the first input resistor, and a first resistance element connected to the output end of the second input resistor. Furthermore, the differential amplifier circuit includes a high-precision operational amplifier having an offset voltage or a drift voltage lower than that of the operational amplifier. The high-precision operational amplifier includes an inverting input terminal connected to the output end of the first input resistor and an output terminal connected to the output end of the second input resistor.

The invention relates to an alternating current and direct current mixed noise source device. An alternating current signal source VIN1 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with the common end of a resistor R1 and a resistor R2; one end of the input resistor R3 is connected with the common end of the resistor R1 and the resistor R2, the other end of the input resistor R3 is connected to the base electrode of the first-stage amplifier V1, the emitter electrode of the first-stage amplifier V1 is connected to the base electrode end of the second-stage amplifier V2, the emitter electrode of the second-stage amplifier V2 is connected with one end of the resistor R4, the other end of the resistor R4 is grounded, and the collector electrodes of the two stages of triodes are connected together and connected with VCC; the emitter of the secondary amplifier V2 is connected with one end of a coupling capacitor C2, and the other end of the coupling capacitor C2 is a mixed signal output end VIN2; an inductor L1 is connected between the VCC and the mixed signal output end VIN2, and a capacitor C3 is connected between the VCC and the GND. The circuit has the advantages that two-stage triode current amplification, capacitance coupling, inductance isolation and the like are designed, and the circuit is simple in structure, low in cost and convenient to use.

The utility model discloses a short-wave impedance matcher. The short-wave impedance matcher is used for carrying out impedance conversion between an input resistor and an output resistor which are different in impedance and comprises at least two coaxial lines arranged between the input resistor and the output resistor. A magnetic ring is nested outside at least one of the at least two coaxial lines; the coaxial line comprises an inner conductor, an insulating layer and an outer conductor which are nested and connected from inside to outside. According to the electromagnetic coupling principle, the coaxial lines and the magnetic rings are introduced to serve as matching elements to replace inductors and capacitors, and broadband impedance matching of short-wave frequency is successfully achieved only through series connection, parallel connection and the like of the coaxial lines. The ultra-wideband filter has the advantages of simplicity in implementation, small size, wide frequency band, high bearing power and the like, and has a wide application prospect in various radio frequency circuit devices such as amplifiers, antennas and the like.

The present invention relates to RF energy harvester technology, and more particularly, to an RF-DC rectifier that can be configured with a larger number of rectifier cells while maintaining the input resistance of the RF-DC rectifier at a certain level. According to one embodiment of the present invention, the RF energy harvester can have higher input sensitivity and can thus be used more efficiently in terms of wireless reception power in various wireless sensor networks such as remote monitoring, industrial and home IoT, wearable devices, etc.

The present invention addresses the problem of easily setting the input voltage of a preamplifier. The present invention includes a preamplifier (10) that obtains a preamplifier positive output (vc) and a preamplifier negative output (vb) corresponding to a difference between an upper-side voltage and a lower-side voltage of a current detection resistor (R0). The preamplifier (10) has a first operational amplifier (opa1), the upper voltage is input to the negative input end of the first operational amplifier, the lower voltage is input to the positive input end of the first operational amplifier, and the first operational amplifier (opa1) obtains a first operational amplifier positive output and a first operational amplifier negative output on the basis of the difference between the upper voltage and the lower voltage. The connection point of the negative input resistor of the first operational amplifier and the negative input end of the first operational amplifier is connected to a constant voltage source through a first input adjusting resistor, and the connection point of the positive input resistor of the first operational amplifier and the positive input end of the first operational amplifier is connected to the constant voltage source through a second input adjusting resistor.

The application relates to a range-adaptive inductance measurement circuit, method and multimeter, the circuit comprising: a signal generation circuit connected at two ends of an inductance to be measured and a range switching circuit, and a processor connected with the signal generation circuit and the range switching circuit; wherein the signal generation circuit is used for outputting an alternating current signal or a direct current signal; the range switching circuit is used for range switching; and the processor is used for obtaining an inductance value of the inductance to be measured according to an alternating current input resistance corresponding to the inductance to be measured when the signal generation circuit outputs the alternating current signal and a direct current input resistance corresponding to the inductance to be measured when the signal generation circuit outputs the direct current signal, and controlling the range switching circuit to perform range switching according to the inductance value. The circuit can realize range-adaptive inductance measurement, solves the problem of low inductance detection efficiency caused by manual range adjustment in the prior art, and has the advantages of simple structure, improved production test efficiency and reduced industrial cost.

A preamplifier obtains a preamplifier positive output and a preamplifier negative output; and a post-amplifier has a positive input end to which the preamplifier positive output is input and a negative input end to which the preamplifier negative output is input, and obtains a post-amplifier output. The post-amplifier includes: a positive side input resistor disposed in an input path to the positive input end; a negative side input resistor disposed in an input path to the negative input end; a feedback resistor disposed in a feedback path from a post-amplifier output end to the negative input end; and a resistor network in which an offset voltage obtained by performing resistance division to the voltage of the reference power supply is supplied to the positive input end, and a combined resistance value corresponds to the resistance value of the feedback resistor.

This invention relates to the field of analog integrated circuits, specifically to a multimode programmable gain amplifier suitable for high-precision analog front-ends. The invention adds a switching array and a pseudo-resistor VPR to the input capacitor of a traditional CCIA structure. A DAC-adjusted control voltage is simultaneously applied to the substrate and gate of the VPR, making the bandwidth adjustable from tens of Hz to 20kHz. Two sets of oppositely connected PMOS pseudo-resistors are used, improving the dynamic range and adapting to various PVT conditions. The input resistor uses a combination of R-2R resistor arrays and parallel resistor arrays, reducing the area while maintaining high gain linearity. Furthermore, drawing inspiration from high-precision DAC structures, a thermometer code is used in the high bits of the APGA control bit to reduce gain error. This invention is compatible with both capacitive and voltage signals, enabling multimode applications. While achieving digitally adjustable bandwidth, it also possesses high dynamic range and adjustment linearity, better adapting to signals of different frequencies.

The present invention addresses the problem of easily setting an offset voltage of a post-amplifier. The present invention is provided with: a preamplifier (10) that obtains a preamplifier positive output (vc) and a preamplifier negative output (vb) corresponding to the difference between the upper voltage and the lower voltage of a current detection resistor (R0); and a post-amplifier (12) which has a positive input terminal to which the positive output of the pre-amplifier is input and a negative input terminal to which the negative output of the pre-amplifier is input, and which obtains a post-amplifier output (vout). A post-amplifier (12) includes: a positive-side input resistor (R4b) disposed on an input path leading to a positive input terminal; a negative-side input resistor (R4a) disposed on an input path leading to the negative input terminal; the feedback resistor (R5) is configured on a feedback path from the output end of the post amplifier to the negative input end; and a resistance network that connects the positive input terminal to the reference power supply and the ground, supplies an offset voltage to the positive input terminal, said offset voltage being obtained by dividing the voltage of the reference power supply by resistance, and has a combined resistance value corresponding to the resistance value of the feedback resistor.

One aspect can provide a direct current (DC) feedback circuit. The DC feedback circuit can include a gain path, a first feedback capacitor coupled, in parallel, to the gain path, and an input resistor coupled to an input of the gain path and the first feedback capacitor. The gain path can include an input stage with a pair of transconductance amplifiers, a gain stage with one or more amplifiers, and an output stage with at least one negative feedback amplifier.

A digital-to-analog converter (DAC) may include an integrator, an input network, and control circuitry. The input network may include a plurality of parallel taps, each having a signal delay such that at least two of the signal delays of the members of the plurality of parallel taps are different, and wherein each member is coupled between an input of the digital-to-analog converter and an input of the integrator. The control circuitry may be configured to selectively enable and disable particular members of the plurality of parallel taps in order to program an effective input resistance of the input network to control an analog gain of the DAC, such that the control circuitry enables, substantially contemporaneously, an even number of members at a time in order to increase the analog gain, with half of such enabled members in a first group and half of such enabled members in a second group.

A preamplifier obtains a preamplifier positive output and a preamplifier negative output corresponding to a difference between an upper voltage and a lower voltage of a current detection resistor. The preamplifier includes an operational amplifier, in which the upper voltage is input to an operational amplifier negative input end and the lower voltage is input to an operational amplifier positive input end, and which obtains an operational amplifier positive output and an operational amplifier negative output based on a difference between them. The connection point between an operational amplifier negative input resistor and the negative input end of the operational amplifier is connected to a constant voltage source via a first input adjustment resistor; and the connection point between an operational amplifier positive input resistor and the positive input end of the operational amplifier is connected to the constant voltage source via a second input adjustment resistor.

This invention provides an audio signal gain circuit, an audio system, and a recorder. The audio signal gain circuit includes a switching module, an input resistor module, and a differential amplifier module, each with a high-gain channel and a low-gain channel. The input terminal of the input resistor module is used to receive the original audio signal to be gained, and the output terminal of the input resistor module is electrically connected to the input terminal of the differential amplifier module. The output terminal of the differential amplifier module is used to output the gained target audio signal. The switching module is connected in series with the input resistor module and the differential amplifier module and is used to adjust the actual input resistance of the input resistor module connected to the differential amplifier module. This invention achieves adjustable input resistance, thereby enabling the use of corresponding gain channels in the differential amplifier module to achieve gain processing of audio signals of different formats in different gain channels. While achieving high dynamic range gain processing, it saves hardware consumption, has low cost, and good consistency.

Apparatuses using on-pad input resistance for compact packaging of semiconductor dies are described herein, as well as methods for constructing such apparatuses and systems and devices that use them. An example apparatus includes a substrate, a first semiconductor die disposed on the substrate and implementing a first field-effect transistor with a gate terminal accessible by a first gate pad, and a second semiconductor die disposed on the substrate and implementing a second field-effect transistor with a gate terminal accessible by a second gate pad. A conductive element is configured to electrically couple the first gate pad and the second gate pad to a shared gate node with a first resistor coupled to the first gate pad (between the conductive element and the first gate pad) and with a second resistor coupled to the second gate pad (between the conductive element and the second gate pad).