6 results about "Pole frequency" patented technology

A voltage regulator includes a first circuit to generate a difference signal based on an input reference voltage, a regulated output voltage, and a signal on a feedback node. The voltage regulator includes a second circuit to provide the regulated output voltage on the output node based on the difference signal. The second circuit includes a first transistor coupled to receive the difference signal, a first feedback circuit to provide a first feedback signal to the feedback node, and a second feedback circuit to provide a second feedback signal to the feedback node. An open loop frequency response of the voltage regulator has a first pole and a second pole and the first feedback signal may adjust the frequency of the second pole based on a load current. The second feedback signal may adjust loop gain based on the load current.

The application discloses a non-inductive FOC ripple feature rotor positioning method and system, and the method comprises the following steps: in the motor zero-speed starting stage, a multi-directional detection voltage vector with gradually increasing amplitude is injected into the stator winding, and the multi-directional detection voltage vector contains at least three non-collinear spatial directions; the three-phase current transient response under the action of each voltage vector is synchronously collected, and the current ripple characteristic component matched with the rotor salient pole frequency is extracted through band-pass filtering; based on the spatial distribution anisotropy of the current ripple characteristic component, a position sensitive factor set corresponding to the voltage direction is constructed, and each position sensitive factor in the position sensitive factor set represents the distribution weight of the ripple energy under the excitation of the voltage direction. Through the multi-dimensional collaborative detection mechanism and the dynamic feature compensation architecture, the application realizes robust control in all working conditions.

The invention particularly relates to an asymmetric response superconducting resonator loaded with vertical through holes and interdigital capacitors and a superconducting filter based on the resonator, and belongs to the technical field of high-temperature superconducting circuits and microwave communication. The filter comprises a dielectric substrate, a high-temperature superconducting thin film layer and a circuit constructed on the high-temperature superconducting thin film layer, the circuit comprises four single-ended grounding folded microstrip structures, an interdigital capacitor, a rectangular microstrip block grounding structure, a feeder auxiliary line, an input / output microstrip feeder and a grounding through hole, and four grounding multimode resonators are formed to provide eight pole frequencies. By adjusting the width of the rectangular microstrip block grounding structure and the length and position of the interdigital capacitor, independent regulation and control of odd-even mode frequency and flexible control of a transmission zero point are realized. An additional topological structure is not needed, selectivity and out-of-band rejection performance of the filter are remarkably improved while the size of a device is reduced and low insertion loss is kept, the filter is compatible with an existing thin film process, the miniaturization and batch requirements are met, and the industrialization potential is outstanding.

Disclosed in the present invention are a transformer-type differential series resonant cavity, a differential series resonant oscillator, a chip and a device. The resonant cavity comprises: a two-port transformer and a variable capacitor module, wherein the two-port transformer contains an inductor LP1, an inductor LP2, an inductor LS1 and an inductor LS2 which are coupled to each other; the variable capacitor module comprises a variable capacitor CP and a variable capacitor CS; one end of the inductor LP1 is connected to a first port, and the other end thereof is connected to the variable capacitor CP; one end of the inductor LP2 is connected to a second port, and the other end thereof is connected to the variable capacitor CP; one end of the inductor LS1 and one end of the inductor LS2 are respectively connected to a third port and a fourth port, and the other end of the inductor LS1 and the other end of the inductor LS2 are connected to each other; two ends of the variable capacitor CS are respectively connected to the third port and the fourth port; and the frequencies of a plurality of poles of a voltage gain function AV are set to be equal, such that AV at a zero phase is increased. The present invention solves the problem of it being impossible for a series resonant oscillator to realize a pure differential output in a current pure CMOS process.

The invention relates to the field of integrated circuits, in particular to a low-phase-noise differential oscillator, a self-adaptive biasing circuit and application of the low-phase-noise differential oscillator and the self-adaptive biasing circuit. The oscillator adopts a Class-C architecture, and a self-adaptive bias circuit composed of two bias copy transistors, an integrating capacitor and a bias resistor is introduced. The self-adaptive biasing circuit and the Class-C oscillator can form a feedback loop, so that the differential crystal oscillator can reliably start oscillation in a C-type working mode; and the conduction angle of the cross coupling pair is limited in a relatively small range, so that extra noise is prevented from being introduced by an overlarge conduction angle. The adaptive biasing circuit can further reduce the pole frequency corresponding to a low-frequency additional resonance point introduced by the Class-C structure. Therefore, the problem that the differential crystal oscillator is difficult to give consideration to reliable oscillation starting and parasitic oscillation suppression is solved.

The application provides a constant current module and application thereof. The constant current module comprises a high electron mobility field effect transistor based on a III-V compound and a source feedback resistor; the source feedback resistor comprises a built-in source resistor of the transistor or the built-in source resistor of the transistor and an external source resistor connected to the source. In the application, the source feedback resistor is arranged in the constant current module, so that the gain of the constant current module is reduced, the stability is improved, the high-frequency performance is improved, the ringing phenomenon is avoided, the transient response is not too slow, the pole frequency is more controllable, the probability of self-oscillation is reduced, the power density is controlled, the working temperature is reduced, the service life is prolonged, the knee voltage is obviously reduced, the influence caused by the production process error of the transistor is reduced or eliminated, and the yield is improved.