508 results about "Transconductance" patented technology

A calibration circuit includes a replica transconductance stage that is a replica of a transconductance amplifier in a serializer / deserializer (SerDes) interface and a replica transimpedance stage that is a replica of a transimpedance amplifier in the SerDes interface. The replica transimpedance stage has an input coupled to its output. A comparison circuit is configured to generate a difference signal representative of a difference between voltage levels of an input signal received at an input of the replica transconductance stage and an output signal representative of voltage level at the output of the replica transimpedance stage. Replica feedback resistors are configured to couple an output of the replica transimpedance stage to the input of the replica transconductance stage. The difference signal can be used to select resistance values provided by the replica feedback resistors and by corresponding gain control resistors in the transimpedance amplifier in the SerDes interface.

An even harmonic multiplier employing complementary current reuse is disclosed. The even harmonic multiplier employs supply voltage and current density scaling to reduce power consumption. Further, by using complimentary NMOS and PMOS transistors, the even harmonic multiplier achieves high areal efficiency. Current reuse causes a reduction in noise at the first harmonic, as the corresponding first harmonic currents from the NMOS and PMOS transistors are in opposite, i.e., canceling, directions. Complementary current reuse is now feasible, as the performance of PMOS transistors at current process nodes is similar to those of NMOS transistors, with appropriate sizing leading to approximately equivalent transconductances. Multiple even harmonic multiplier configurations are possible, with many using transformer circuits at the input and / or the output. The resultant even harmonic multipliers find ready application in millimeter wave radio frequency receivers. The most common even harmonic multiplier is a frequency doubler, which produces a strong second harmonic signal.

A monitoring device is provided. The monitoring device comprises one or more circuitry operable to obtain measurements of one or more pins of a battery system, the one or more circuitry comprising at least one circuit for monitoring current, which comprise: at least one other circuit for amplifying variance comprising at least one differential amplifier, one voltage reference in electrical connection with a first input of the differential amplifier; at least one transconductance means comprising at least one output in electrical connection with a second input of the differential amplifier and at least one input in electrical connection with an output of the differential amplifier; at least one current source in electrical connection with at least one output of the at least one transconductance means; and an output in electrical connection with at least one output of the at least one transconductance means.

The invention provides a low-noise amplification circuit, a radio frequency front-end module and an electronic terminal.The low-noise amplification circuit comprises an input matching adjustment circuit, a common-source amplification circuit, a first inductor, an inter-stage feedback circuit, a common-gate amplification circuit, an input and output feedback circuit, an output matching adjustment circuit and an output attenuation circuit; the common-source amplification circuit comprises at least two first signal amplification units; each first signal amplification unit comprises a first field effect transistor; the common-gate amplification circuit comprises at least two second signal amplification units; and each second signal amplification unit comprises a second field effect transistor. According to the low-noise amplification circuit, transconductance nonlinearity of devices under different bias signals can be mutually counteracted, so that the linearity fluctuation of the low-noise amplification circuit at different temperatures is optimized, and the linearity of the low-noise amplification circuit is kept basically not to change along with the temperature change.

The invention provides a continuous time linear equalizer based on a low-pass and band-pass mixed structure. The continuous time linear equalizer comprises a frequency selection coupler, a low-pass transconductance unit, a band-pass transconductance unit and a load unit. The frequency selection coupler is used for separating the differential analog signal into a first voltage component in a first band-pass frequency range and a second voltage component in a low-pass frequency range, the first band-pass frequency range comprises a target frequency expected to be compensated, and the frequency in the first band-pass frequency range is greater than the frequency in the low-pass frequency range; the band-pass transconductance unit is used for converting the first voltage component into current and synchronously realizing gain amplification to obtain a first current signal; the low-pass transconductance unit is used for converting the second voltage component into current and synchronously realizing gain amplification to obtain a second current signal; the load unit is used for summing the first current signal and the second current signal and converting the sum to a differential output voltage signal. According to the invention, the frequency corresponding to the gain peak point and the gain amplitude can be improved.

An error amplifier includes a first transistor having a first error amplifier input and having first and second current terminals, a second transistor having a second error amplifier input and having third and fourth current terminals, a first resistor coupled between a supply voltage terminal and the first current terminal, and a second resistor coupled between the supply voltage terminal and the third current terminal. The error amplifier has a second stage circuit coupled to the first and second resistors. The second stage circuit has an error amplifier output. The second stage circuit is configured to cause less current to flow through the second stage circuit than a current that flows through either of the first or second resistors or the first or second transistors.

A cascade amplification circuit module based on complementary parameter amplifiers belongs to the technical field of integrated circuit amplifiers and comprises a first-stage complementary parameter amplifier (CPA) and a second-stage amplifier (floating inverting type or transconductance resistance type). The first-stage CPA adopts an NMOS and PMOS complementary structure, passive amplification is achieved through grid multiplexing, a grid capacitor is used for storing signals in the sampling stage, a depletion layer capacitor is switched to improve gain in the amplification stage, common-mode voltage is stabilized through complementary design, and an extra feedback circuit is not needed. And the second-stage amplifier provides driving capability and is combined with passive gain to suppress noise. The cascade structure does not need frequency compensation, the design is simplified, the problem of balancing gain, noise and power consumption of a traditional amplifier is solved, and the cascade amplifier has the advantages of being high in energy efficiency and low in complexity.

The invention discloses a ClassAB output stage bias structure based on a negative feedback loop, which belongs to the technical field of integrated circuit design and comprises a ClassAB output stage structure and a negative feedback loop floating current source structure. The ClassAB output stage structure is used for realizing the rail-to-rail output performance of the operational amplifier, and the negative feedback loop floating current source structure is used for determining the static bias current of the ClassAB output stage structure; the negative feedback loop floating current source structure comprises a floating current source structure, a static bias structure, a loop bias structure, a current reference structure and a state conversion structure. According to the invention, static bias is carried out on the ClassAB output stage through a negative feedback loop, the bias precision and good temperature drift resistance are ensured, and the problems of static bias point error, drift and the like caused by the fact that the output stage of the rail-to-rail, low-power-consumption and zero-drift operational amplifier applies traditional linear transconductance ring bias are solved.

A filter stage system comprising a continuous-time baseband filter comprising a feedback loop employing at least one first impedance node and at least one second impedance node, wherein the at least one first impedance node has a higher impedance than the at least one second impedance node, and wherein the at least one first impedance node provides a dominant pole and the at least one second impedance node provides a non-dominant pole, and wherein the continuous-time baseband filter generates a filtered current, and a mirror component mirrors the filtered current to an output.

The invention relates to the technical field of kits, in particular to a MoS2 back gate field effect transistor based on a wet transfer process and a preparation method of the MoS2 back gate field effect transistor. The MoS2 back gate field effect transistor is formed by sequentially arranging a silicon-based substrate, a SiO2 insulating layer, a MoS2 conducting channel layer and an Ag source drain electrode from bottom to top; a high-quality single-layer MoS2 thin film is prepared through a chemical vapor deposition (CVD) method, PMMA is adopted as a supporting layer, clean Van der Waals contact of the MoS2 thin film and a SiO2 / Si substrate is achieved through a wet transfer process of NaOH solution etching, deionized water cleaning and acetone stripping of the supporting layer, and finally a source electrode and a drain electrode are prepared by combining photoetching and thermal evaporation processes. According to the method, the problems of pollutant residues and traps of an interface between MoS2 and the substrate in the traditional process are effectively solved, the carrier mobility, transconductance and on-state current of the device are remarkably improved, the sub-threshold swing is reduced, and the method is suitable for manufacturing a two-dimensional material integrated circuit device with low power consumption and high performance.

An integrated circuit device includes: one or more switches of a Buck converter; and a control circuit for the Buck converter including: a comparator configured to generate a comparator output signal by comparing a feedback voltage of the Buck converter with a compensation ramp voltage; a pulse generator configured to generate, in response to a rising edge in the comparator output signal, a pulse signal for controlling the Buck converter; a transconductance amplifier configured to generate, at an output terminal of the transconductance amplifier, a current proportional to a difference between a reference voltage and the feedback voltage; a capacitor coupled between the output terminal of the transconductance amplifier and a reference voltage node; and a ramp signal generator configured to generate the compensation ramp voltage by adding a voltage at the output terminal of the transconductance amplifier and a ramp voltage generated by the ramp signal generator.

AED pulse generation circuits that provide floating, adjustable, bias voltages for driving a solid-state defibrillation waveform therapy generator circuit are provided. The provided bias voltages allow to reverse polarity of provided electric shock to increase chances of successful defibrillation and survival. In one of the provided configurations, energy stored in the pulse capacitor can be discharged by activating the waveform therapy generator in the high-resistance transconductance region. The circuits can be positioned on a self-contained module potted with an insulating material to reduce unintended interactions with other AED components. Through the use of the disclosed circuits, AED size can be reduced to promote pocketability while simultaneously increasing AED reliability.

Disclosed is a two-stage successive approximation register analog to digital converter based on a difference and differential amplifier, including a first-stage sub-ADC, a difference and differential amplifier, and a second-stage sub-ADC connected in sequence. The first-stage sub-ADC and the second-stage sub-ADC each include capacitor arrays and comparators. The difference and differential amplifier includes a transconductance amplifier GM1, a transconductance amplifier GM2, a resistance load R, and proportional resistors R1 and R2. The transconductance amplifier GM1, the resistance load R, and the transconductance amplifier GM2 form a negative feedback loop. The disclosure adjusts the gain of the amplifiers through the proportional resistors R1 and R2, so that higher conversion accuracy can be achieved.

The invention provides an error amplifier for peak current mode control and a converter system. The error amplifier comprises a transconductance amplifier, a voltage clamping module, a voltage-current converter, a slope compensation module, a current clamping module and a mirror image tube, the negative end of the transconductance amplifier is used for loading feedback voltage, and the positive end is used for loading reference voltage; the output end of the transconductance amplifier, the output end of the voltage clamping module and the input end of the voltage-current converter are electrically connected; the voltage-current converter generates error current; the slope compensation module is used for performing slope compensation on the error current to generate a compensated current; the output end of the slope compensation module, the output end of the current clamping module and the positive end of the high-side comparator are electrically connected with a second reference node; and the mirror image tube is used for loading the comparison voltage to the positive end of the high-side comparator. The error amplifier provided by the invention can realize more stable mode switching and more accurate current limiting control.

The invention discloses a single-power-supply ultra-wideband temperature compensation low-noise amplifier circuit, and belongs to the technical field of radio frequency microwaves. The circuit is mainly composed of a pre-stage low-noise amplifier module, an inter-stage temperature compensation equalization module and a post-stage driving amplifier module. The temperature compensation equalizer module generates differential voltage related to temperature through a three-stage gallium arsenide diode temperature sensing unit, outputs a control signal through an enhanced FET differential amplification circuit, drives a voltage-controlled attenuation equalizer to dynamically adjust the attenuation amount of a radio frequency signal, and achieves gain stability in a frequency band. Through the collaborative design of a blocking capacitor and a divider resistor, the grid bias of an FET switch is strictly limited in a transconductance linear adjustment interval, and the interval covers 80% of the effective range of the threshold voltage of a gallium arsenide FET tube. The circuit is powered by a single power supply + 5V, stable work of each module is ensured through active bias and a power supply filter network, and the circuit is suitable for extreme temperature environments such as high-frequency communication and radar.

According to the synchronous programmable two-way current source relative deviation calibration device and method, the influence of the thermal effect of the sampling resistor on relative deviation data is avoided through specific connection among the two-way synchronous current source, the programmable resistor module and the sampling resistor. The programmable resistor module is used, and the influence of voltage noise output by the current source on relative deviation data is reduced. According to the invention, the upper computer controls the double-throw switch to act and sends the corresponding response code value to the corresponding synchronous current source for output, so that the relative deviation signal data of the two-way synchronous current source under all output current gears is obtained. Relative deviation signal compensation is carried out on the reference current source, the problem that the deviation of current responding to the same code value is too large under the combined action of the difference value of reference voltage values of two synchronous current sources, the error of a transconductance amplifier and the nonlinear difference of a DAC chip is solved, and then the problem that a superconducting quantum interference device loses lock in a CCC system is solved.

The invention discloses a defect coupling low-noise amplifier. The low-noise amplifier solves the problem that the performance of a low-noise amplifier in the prior art is influenced by a grid source inductance coupling coefficient. Forward coupling of an input inductor and a grid inductor and reverse coupling of the input inductor and a source inductor are achieved through a unique defect coupling transformer matching network, meanwhile, reverse coupling of a grid inductor and the source inductor is achieved, and the coupling coefficient of the grid-source inductor is reduced through coupling counteracting inductance; by combining a differential common-source transconductance amplification stage, a four-order magnetic coupling resonance unit, a differential transconductance amplification stage with a neutralizing capacitor and an output transformer matching network, the characteristics of high gain bandwidth and low noise are realized; simulation and actual tests verify that the low-noise amplifier can effectively reduce the noise coefficient and broaden the input matching range, has good compatibility and wide application prospects based on a conventional integrated circuit production process, can be applied to a phased array system, and can also form a receiver system with other circuits.

A switched-mode power supply includes: a Buck converter; and a control circuit for the Buck converter, which includes: a switching unit configured to generate a switching control signal based on a feedback voltage of the Buck converter and a compensation ramp voltage; a transconductance amplifier, where a first input terminal and a second input terminal of the transconductance amplifier are configured to receive a reference voltage and the feedback voltage, respectively; a switch coupled between an output terminal of the transconductance amplifier and a first node, where the switching unit is coupled between the first node and the Buck converter; a compensation control circuit coupled to a control terminal of the switch and configured to open or close the switch based on a first signal representative of a current flowing through an inductor of the Buck converter; and a ramp signal generator configured to generate the compensation ramp voltage.

The invention provides a compact common-mode stable transconductance boosting power amplifier, which relates to the technical field of power amplifiers, and comprises an input balun, an offset inductance module, a power amplification module, an output balun and a plurality of power supply modules, the input balun is used for converting an input signal into a pair of differential signals, and a secondary coil of the input balun is provided with a common-mode stability improving module used for improving common-mode stability; the offset inductance module is used for improving transconductance, and the offset inductance module is arranged in the primary coil and the secondary coil of the input balun; the power amplification module is used for amplifying the differential signal; different input nodes of the power amplification module are respectively connected with the offset inductance module and a secondary coil of the balun; the output balun is used for performing power synthesis on the amplified differential signals and outputting the signals through the first end of the secondary coil of the output balun. The power amplifier has the advantages that the compactness, the gain efficiency and the common-mode stability of the power amplifier are considered.

The invention discloses a low dropout linear regulator with bidirectional current conduction capability, which is characterized in that two input ends of an error amplifier are respectively connected with signals VB and FB, and a power level of a linear transconductance ring is used as a light load power level; the first output end of the error amplifier is connected with the first input end of the linear transconductance ring, the first input end of the light load power level and the input end of the first source follower, and the output end of the first source follower is connected with the first input end of the heavy load power level. The second output end of the error amplifier is connected with the second input end of the linear transconductance ring, the second input end of the light load power level and the input end of the second source follower, and the output end of the second source follower is connected with the second input end of the heavy load power level. The problem that the quiescent current of a traditional bidirectional current conduction LDO is too large under the conditions of light load and no load is solved, and it is guaranteed that the output power tube can be completely conducted when the LDO works in an open loop mode.

The invention discloses an anti-radiation low-phase noise voltage-controlled oscillator based on an SOI (Silicon On Insulator) process, relates to the technical field of oscillators, and is used for solving the technical problem that the existing voltage-controlled oscillator based on the SOI process cannot realize low phase noise and high anti-radiation capability at the same time. The anti-radiation low-phase noise voltage-controlled oscillator based on the SOI technology comprises an energy storage unit and a negative transconductance unit. The energy storage unit forms a resonant cavity through an inductor and a capacitor; the negative transconductance unit is connected with the energy storage unit; the negative transconductance unit at least comprises a first cross-coupled pair and a second cross-coupled pair which are formed by a plurality of transistors; the first cross coupling pair is used for generating negative resistance to compensate the loss of the energy storage unit, and the second cross coupling pair serves as a current switching network; the first cross coupling pair and the second cross coupling pair form a negative resistance characteristic, direct-current energy is converted into alternating-current oscillation energy, loss of the resonant cavity is compensated, and a generated oscillation signal is output from the output node.

The invention discloses a phase-locked loop system based on high-speed low-jitter double-edge sampling phase discrimination. The phase-locked loop system comprises a sampling phase discriminator which comprises a first sampling path, a second sampling path and a non-overlapping sampling clock generation circuit used for generating a first sampling clock signal and a second sampling clock signal; alternately sampling and updating the phase error voltage signal through the first sampling path and the second sampling path; the transconductance amplifier is used for receiving the phase error voltage signal and a reference voltage and inputting an output current signal into the filter so as to output an integral voltage signal; the filter is also used for receiving the phase error voltage signal and outputting a proportional voltage signal; the voltage-controlled oscillator is used for receiving the integral voltage signal and the proportional voltage signal and outputting a feedback clock signal. According to the phase-locked loop system provided by the invention, the rising edge and the falling edge of the clock signal are fully utilized to update the control voltage at double reference frequency.

An exemplary setup includes: a transconductance circuit arrangement with one input and one output; a first capacitor with one terminal; an amplifier with one input and one output, wherein the input of the amplifier is coupled to the output of the transconductance circuit arrangement and the terminal of the first capacitor; a resistor with a first terminal and a second terminal; and a second capacitor with a first terminal and a second terminal, wherein the first terminal of the second capacitor is coupled to the output of the amplifier and the first terminal of the resistor, and wherein the second terminal of the second capacitor is coupled to the input of the transconductance circuit arrangement and the second terminal of the resistor.

The invention discloses a conversion control circuit and method for changing the output voltage of a power factor correction circuit. The conversion control circuit is used for controlling the resonant power converter and is used for changing the first output voltage generated by the power factor correction circuit. The resonant power converter generates a second output voltage according to the first output voltage. The conversion control circuit includes: a first transconductance circuit generating a first signal according to a proportional output voltage related to a second output voltage; the second transconductance circuit generates a second signal according to an input related signal, and the input related signal is related to the peak value of the input voltage of the power factor correction circuit; the current control circuit generates a third signal according to the first signal and the second signal. The third signal is used for changing the first output voltage, so that when the second output voltage drops, the first output voltage drops, and when the input voltage drops, the first output voltage drops.

The present invention discloses a low-mismatch dynamic transconductance subsampling charge pump, comprising a floating capacitor bias unit, a switch unit, and a transconductance unit. The floating capacitor bias unit is connected to the transconductance unit, configured to store charge and generate a voltage signal to provide a potential for the transconductance unit. The switch unit is connected to the transconductance unit, configured to control the charging and discharging of the transconductance unit according to an input switching voltage. The transconductance unit is configured to convert the differential voltage into a charge and discharge current. The low-mismatch dynamic transconductance subsampling charge pump provided by the present invention reduces the mismatch caused by current mirror copying. Furthermore, the dynamic bias provided by the capacitor reduces the transconductance of the input transistor, thereby reducing noise in the subsampling charge pump and improving circuit performance.

The invention discloses a low-mismatch ultra-wideband active balun, which belongs to the technical field of analog integrated circuits and comprises a first-stage amplifier and a second-stage amplifier which are sequentially arranged. The first-stage amplifier adopts a differential structure, and finally conversion from a single-end signal to a constant-amplitude and anti-phase differential signal is achieved. The second-stage amplifier isolates the influence of a rear-stage load on a front stage, and the symmetry of differential signals is ensured. In the second-stage amplifier, a seventh NMOS transistor and a tenth NMOS transistor form positive feedback; by introducing the cross coupling capacitor, the gate-source voltage difference between the eighth NMOS transistor and the ninth NMOS transistor is increased, voltage recovery is formed, compared with a traditional active balun, the second-stage amplifier reduces phase and amplitude mismatch of an output signal through positive feedback, meanwhile, the bandwidth is expanded, and therefore the bandwidth is increased. And the grid source signal amplitude is increased by utilizing source electrode voltage recovery, the equivalent transconductance is enhanced, and the phase and amplitude of the output signal are further stabilized.

The application discloses a kind of LDO without slice outside capacitance, belongs to linear power supply technical field, including transconductance constant circuit Gmc, constant transconductance error amplifier AE1, first output circuit, error amplifier AE2, second output circuit, band gap reference circuit BGR, power tube Pn1 and power tube Pn2;The transconductance constant circuit Gmc is used to generate bias voltage signal;The constant transconductance error amplifier AE1 is used to generate first output signal;The error amplifier AE2 is used to generate second output signal;Band gap reference circuit BGR generates multiple independent stable outputs, provides stable reference voltage for constant transconductance error amplifier AE1 and error amplifier AE2, and then generates bias voltage through transconductance constant circuit Gmc, and constant transconductance error amplifier AE1 drives power tube Pn1 through first output circuit to output signal for analog load, and error amplifier AE2 drives power tube PN2 through second output circuit to output signal for digital load.

The embodiments of the present invention disclose a bandgap reference circuit, a reference voltage source, and a reference voltage generation method. The circuit includes a current module, a differential input module, a limit module, a feedback module, and a voltage divider module. The differential input module generates a first conduction current and a second conduction current in response to a first voltage signal and a second voltage signal of the voltage divider module, respectively, and further outputs a first output current and a second output current, respectively. The limit module outputs a drive signal in response to the first output current and the second output current to control the feedback module to adjust the first voltage signal and the second voltage signal so that the first output current and the second output current are equal, so that the differential input module outputs a reference voltage with a zero temperature coefficient. The limit module includes a matching resistor or a low transconductance switch tube to reduce the offset voltage. The present invention reduces the offset voltage of the limit module and improves the accuracy of the reference voltage by setting a matching resistor or a low transconductance switch tube in the limit module.

The described technology provides a device including a phase locked loop (PLL) circuit, the PLL circuit including a voltage controlled oscillator (VCO) and a phase detector, and a voltage supply and transconductance cell (Gm) configured to drain a current Iout from the VCO based on a sensed voltage (Vsup_sense) input into the Gm, wherein the Gm cell is configured to generate an open_loop signal based on the Iout drain from the VCO.

The embodiment of the present disclosure provides a variable gain amplifier with high temperature stability, which is applied to the technical field of electronic circuit. The amplifier comprises a constant transconductance bias circuit, a first variable gain amplifier and a second variable gain amplifier; wherein the output end of the constant transconductance bias circuit is connected with the input common source transistor of the first variable gain amplifier and the second variable gain amplifier, and is used for providing a constant transconductance bias signal which is compensated according to temperature change; the input end of the first variable gain amplifier is used for receiving an externally input differential signal, and the output end is connected with the input end of the second variable gain amplifier, and is used for transmitting the differential signal after coarse adjustment attenuation to the second variable gain amplifier; and the output end of the second variable gain amplifier is used for outputting an attenuation differential signal with temperature stability. In this way, by restraining the influence of temperature change on the transconductance characteristic of the input common source transistor of the variable gain amplifier, the stable attenuation characteristic of the variable gain amplifier in a wide temperature range is ensured.