Digital Discrete-Time Non-Foster Circuits for Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Non-Foster circuits, which offer enhanced bandwidth and unique functionalities, are currently limited by their instability and require analog implementations, lacking digital discrete-time solutions for adaptive control and scalability.
Innovation Solution
The implementation of digital discrete-time methods and circuits for non-Foster elements and circuits, utilizing analog-to-digital and digital-to-analog converters, along with digital signal processing, to create stable and adaptable non-Foster circuits with options for adaptive control, enabling the creation of negative capacitors and inductors and multi-port configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog circuits are used to implement non-Foster circuits, then non-Foster functionality is achieved, but stability is poor
Solution Approach 1:
The patent replaces analog continuous-time circuits with digital discrete-time signal processing systems. ADCs convert continuous-time voltage signals to discrete-time digital signals, which are then processed by digital signal processors to generate control signals for DACs that drive the output ports. This substitution of mechanical/analog systems with digital systems provides both stability and adaptability through programmable control.
Solution Approach 2:
The patent changes the fundamental operating parameters from continuous-time analog domain to discrete-time digital domain. By sampling signals at discrete time intervals and processing them digitally, the system achieves stable operation while allowing dynamic parameter adjustment through software control, enabling adaptive stabilization and control capabilities.
2Reliability
If digital discrete-time methods are used, then stability and adaptive control are improved, but device complexity increases
Solution Approach 1:
The patent employs universal digital signal processing blocks (ADCs, DSPs, DACs) that can implement multiple functions through software programming. The same hardware architecture can realize different non-Foster circuit configurations and adaptive control strategies by changing the digital processing algorithms, thereby reducing overall system complexity despite the digital approach.
Solution Approach 2:
The patent introduces digital signal processors as intermediary components between the analog input ports and output ports. These intermediaries perform the complex signal processing tasks digitally, isolating the analog front-end from the complex control logic and enabling stable operation with adaptive capabilities without directly complicating the analog circuitry.
3Adaptability or versatility
If analog circuits are used, then implementation is simpler, but adaptability and scalability are limited
Solution Approach 1:
The patent transforms static analog circuit implementations into dynamic digital systems. The digital signal processors can dynamically adjust circuit parameters, impedance values, and control strategies in real-time based on operating conditions, providing adaptability and scalability while maintaining implementation feasibility through standardized digital processing architectures.
Data Source
AI summary
A method to implement circuits and circuit elements having one or more ports may include digitizing, using analog-to-digital converters, continuous-time input signals received from one or more ports of a circuit to form discrete-time input signals. At a digital signal processor, the discrete-time input signals are received and the discrete-time input signals are processed to calculate a desired discrete-time output signals. Using digital-to-analog converters, the calculated desired discrete-time output signal are calculated to form outputs of continuous-time output signals at the one or more ports of the circuit. The continuous-time output signals are output to the same one or more ports that receive the continuous-time input signals; and producing, thereby, a desired relationship between the continuous-time output signals and the continuous-time input signals at the one or more ports.