5 results about "Negative impedance converter" patented technology

An exemplary embodiment of the invention relates to an electrical amplifier (10) comprising a differential preamplifier (PA) having a first output port and a second output port, and a downstream amplifier stage (DAS) having a first output unit and a second output unit; wherein the first output unit is connected to the first output port of the differential preamplifier (PA) and the second output unit is connected to the second output port of the differential preamplifier (PA); and wherein a negative impedance converter is electrically located in at least one of said differential preamplifier (PA) and said downstream amplifier stage (DAS).

Disclosed embodiments provide a self-contained topology that enables a significant noise reduction of capacitive sensor readout interfaces. For example, various embodiments can provide low noise capacitive sensor readout interfaces or analog front ends having a main buffer amplifier in a bootstrap configuration, wherein a bootstrap loop configuration comprises a negative capacitance coupled to an input of the main buffer amplifier with a negative impedance converter.

The application provides a PT symmetric system based on a negative impedance transformer and an energy efficiency and distance improvement method thereof, and is characterized in that: at least one negative impedance transformer is connected in series on a wireless power transmission loop, the negative impedance transformer is constructed based on a transformer and an operational amplifier, wherein: the transformer considers leakage inductance and magnetizing inductance, a primary winding of the transformer is connected in series in the transmission loop, one end of a secondary winding of the transformer is grounded, and the other end is connected to an inverting input terminal of the operational amplifier, and the operational amplifier is equivalent to a negative resistance module or a negative inductance module by configuring a resistance element or / and an inductance element on a corresponding branch. The effect is that: the flexible adjustment of the inductance ratio is realized by constructing a negative inductance on the primary side, the power extreme point is accurately approached, and the output current is optimized in combination with the primary side compensation negative resistance, so that the problem of small power is solved from the core parameter level.

The present application relates to the field of intelligent operation and maintenance of hydroelectric power generation and active acoustic control, and discloses a method and system for intelligent acoustic impedance matching of a hydraulic turbine based on deep learning. The method comprises: collecting full-flow multi-source heterogeneous data to construct a sensor topology graph; using a spatiotemporal graph neural network for feedforward prediction of flow field excitation characteristics; using a multi-agent deep reinforcement learning algorithm with integrated physical constraint learning to make decisions on optimal configuration instructions; actively canceling intrinsic capacitance through a negative impedance converter, reconstructing the equivalent mechanical stiffness of the superstructure, and realizing real-time matching and noise reduction of acoustic impedance; and performing online fine-tuning based on residual noise feedback. The system comprises perception, reasoning, decision-making, execution and feedback optimization modules. The present application breaks through the physical limitations such as the Pashen limit through a non-Foster circuit, significantly enhances the suppression effect of ultra-low frequency below 100 Hz, effectively solves the control lag problem through feedforward logic, improves the stability of complex working conditions, and ensures the adaptability and robustness throughout the life cycle by combining physical constraints and incremental learning.

The invention relates to the technical field of circuits, in particular to a unidirectional signal amplification topological circuit heterojunction based on a non-Hermite skin effect, which is formed by connecting a topological non-trivial region and a topological trivial region at an interface, every two adjacent nodes are connected through a first coupling element, every two secondary adjacent nodes are connected through a negative impedance converter, and each node is connected with a grounding capacitor or a grounding inductor; the topological trivial area is a rectangular circuit lattice, and every two adjacent nodes are connected through a second coupling element; and the boundary nodes of the topological non-trivial region are connected with the boundary nodes of the topological trivial region through third coupling elements, so that the problems of complex circuit structure, poor stability and easy noise interference caused by introduction of additional gain or loss terms for realizing the non-Hermi topology phenomenon are solved; the device has the advantages of simple structure, high stability and low noise.