Dan Mei Feng

US Patent:

8195440, Jun 5, 2012

Filed:

Feb 17, 2009

Appl. No.:

12/372608

Inventors:

Dan Feng - Los Altos CA, US
Joel R. Phillips - Sunnyvale CA, US
Kenneth Kundert - Los Altos CA, US

Assignee:

Cadence Design Systems, Inc. - San Jose CA

International Classification:

G06F 17/50

US Classification:

703 14

Abstract:

Described is a process for performing an improved mixed frequency-time algorithm to simulate responses of a circuit that receives a periodic sample signal and at least one information signal. The process selects a set of evenly spaced distinct time points and a set of reference time points. Each of the reference points is associated with a distinct time point, and a reference time point is a signal period away from its respective distinct time point. The process finds a first set of relationships between the values at the distinct time points and the values the reference time points. The process also finds a second set of relationships between the values at the distinct time points and the values at the reference time points. The process then combines the first and second sets of relationships to establish a system of nonlinear equations in terms of the values at the distinct time points only. By solving the system of nonlinear equations, the process finds simulated responses of the circuit in time domain.

US Patent:

7493240, Feb 17, 2009

Filed:

May 15, 2000

Appl. No.:

09/570709

Inventors:

Dan Feng - Los Altos CA, US
Joel R. Phillips - Sunnyvale CA, US
Kenneth Kundert - Los Altos CA, US

Assignee:

Cadence Design Systems, Inc. - San Jose CA

International Classification:

G06F 17/10

US Classification:

703 2, 703 14, 703 41, 716 1, 716 6, 716 4

Abstract:

Described is a process for performing an improved mixed frequency-time algorithm to simulate responses of a circuit that receives a periodic sample signal and at least one information signal. The process selects a set of evenly spaced distinct time points and a set of reference time points. Each of the reference points is associated with a distinct time point, and a reference time point is a signal period away from its respective distinct time point. The process finds a first set of relationships between the values at the distinct time points and the values at the reference time points. The process also finds a second set of relationships between the values at the distinct time points and the values at the reference time points. The process then combines the first and second sets of relationships to establish a system of nonlinear equations in terms of the values at the distinct time points only. By solving the system of nonlinear equations, the process finds simulated responses of the circuit in time domain.