Timothy J Walters

US Patent:

60235772, Feb 8, 2000

Filed:

Sep 26, 1997

Appl. No.:

8/938676

Inventors:

George E. Smith - Wappingers Falls NY
Lawrence F. Wagner - Fishkill NY
Timothy L. Walters - Poughkeepsie NY
Fariborz Assaderaghi - Mahopac NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06G 748

US Classification:

39550035

Abstract:

A method for use in electronic design models encoded into design software for use in SOI based FET logic design includes simulation of an SOI device and setting a floating body voltage to any desired value at any time during the simulation, by adding to the model an ideal voltage source, whose value is a desired body voltage, in series with an ideal current source, whose value is a constant times the voltage across itself. When the constant is zero no current can flow, and any additional components have no effect on the circuit. When the constant is non-zero, said ideal current source appears to be the same as a resistor such that, current can flow in to or out from the body node, setting its voltage. The constant is kept zero at all times, except when it is desired to change the body voltage. The body voltage can be reset at any time to solve the problem of successive delays in one simulation run and resetting the voltage before each delay measurement starts.

US Patent:

61416320, Oct 31, 2000

Filed:

Sep 2, 1999

Appl. No.:

9/388594

Inventors:

George E. Smith - Wappingers Falls NY
Fariborz Assaderaghi - Mahopac NY
Paul D. Muench - Poughkeepsie NY
Lawrence F. Wagner - Fishkill NY
Timothy L. Walters - Poughkeepsie NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06G 748

US Classification:

703 14

Abstract:

A method for use in electronic design models encoded into design software for use in SOI based FET logic design includes simulation of an SOI device by and setting a floating body voltage to any desired value at any time during the simulation, by adding to the model an ideal voltage source, whose value is a desired body voltage, in series with an ideal current source, whose value is a constant times the voltage across itself. When the constant is zero, no current can flow, and any additional components have no effect on the circuit. When the constant is non-zero, said ideal current source appears to be the same as a resistor such that current can flow in to or out from the body node, setting its voltage. The constant is kept zero at all times, except when it is desired to change the body voltage. The body voltage can be reset at any time to solve the problem of successive delays in one simulation run and resetting the voltage before each delay measurement starts.