System and method for breaking a feedback loop using a voltage controlled voltage source terminated subnetwork model
AssigneeNational Semiconductor Corporation
InventorHoward T. Russell, Jr.
Life of this patent
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Abstract
A system and method is disclosed for breaking a feedback loop by replacing at least one component in the feedback loop with a model containing two physically disconnected subnetworks that have terminals that are connected to ground with voltage controlled, voltage sources (VCVSs). Dependent source parameters of the VCVSs control lateral signal transfer though the model allowing the feedback loop to be opened or closed. The model maybe used in a software simulation in which a replicate circuit is used to set and maintain a closed-loop bias on the open-loop circuit. Small-signal analysis of the equivalent open-loop circuit allows extraction of transfer functions that yield a return ratio RR(s) corresponding to the modeled component.
Claims20
A method for analyzing a multi-terminal network circuit, the method comprising the steps of:
- modeling a physically disconnected topology between a first combination of a plurality of inputs of the multi-terminal network circuit and a second combination of a plurality of outputs of the multi-terminal network circuit;
- and
- controlling lateral signal transfer through the multi-terminal network circuit by setting a dependent source parameter of a voltage controlled voltage source to open or close a feedback loop of a feedback circuit in the multi-terminal network circuit.
A circuit simulator product comprising a tangible machine-readable medium encoded with computer-executable instructions for analyzing a multi-terminal network circuit that comprises a feedback loop, wherein the computer-executable instructions when executed cause a data processing system to perform the steps of:
- modeling a physically disconnected topology between a first combination of a plurality of inputs of the multi-terminal network circuit and a second combination of a plurality of outputs of the multi-terminal network circuit;
- and
- controlling lateral signal transfer through the multi-terminal network circuit by setting a dependent source parameter of a voltage controlled voltage source to open or close the feedback loop of the multi-terminal network circuit.
Dependencies are inferred from the claim text.