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US 4,792,913 AGranted
Simulator for systems having analog and digital portions
AssigneeGrumman Aerospace Corporation
InventorsDennis J. Buckland, Robert B. DeRobertis
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AssigneeGrumman Aerospace Corporation
InventorsDennis J. Buckland, Robert B. DeRobertis
Estimating the term…
An apparatus for simulating, in an engineering workstation (EW) environment, the operation of circuits or systems having analog and digital portions. Information concerning the system or circuit is acquired with input devices such as a keyboard or mouse with the aid of a display and schematic capture programs. An analog simulator and a digital simulator are present in the EW. A first data extraction program extracts selected analog data from the analog simulator. A first conversion program converts the selected analog data into digital values. A first data insertion program provides the digital values as input (forcing functions) to the digital simulator. A second data extraction program extracts selected digital analysis data from the digital simulator. A second conversion program converts the selected digital data to analog data. A second data insertion program supplies the analog data as input to the analog simulator. Selected portions of the analysis produced by either of the simulators may be presented on the display or a hard copy made by a printer.
In an apparatus for simulating both analog and digital circuits, said apparatus having digital computer input means for inputting data concerning a circuit having at least one analog portion and at least one digital portion, said input means controlling said apparatus, analog analysis means for providing analog data of the analog portion of the circuit, digital analysis means for providing digital analysis data of the digital portion of the circuit, and output means for outputting at least one of said analog and digital analysis data, the improvement comprising:
A method of simulating both analog and digital ciruits, said method comprising the steps of
A method as claimed in claim -6, said converting the selected digital analysis data into analog data includes modelling digital output impedance effect of devices modelled in said converting said selected digital analysis data into analog data to produce said digital analysis data.
Dependencies are inferred from the claim text.