Patents by Inventor Champaka Ramachandran
Champaka Ramachandran has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8990743Abstract: Methods and apparatuses to automatically modify a circuit design (e.g., a synthesis solution) according to the sensitivity in design parameters with respect to the possible deviation in the subsequent implementation (e.g., placement and routing) of the circuit. In one aspect of the present invention, a method to design a circuit includes: determining likelihood of a design constraint being violated in an implementation of a first circuit design (e.g., a technology specific netlist with or without a placement solution); and, modifying the first circuit design to reduce the likelihood of the design constraint being violated. In one example, the implementation of the first circuit design includes a routing solution for implementing the first circuit design; and, the first circuit is modified through sizing an instance of a logic element, buffering a signal, load shielding for a signal, or other operations.Type: GrantFiled: March 29, 2012Date of Patent: March 24, 2015Assignee: Synopsys, Inc.Inventors: Champaka Ramachandran, Andrew Crews, Kenneth S. McElvain
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Publication number: 20120185811Abstract: Methods and apparatuses to automatically modify a circuit design (e.g., a synthesis solution) according to the sensitivity in design parameters with respect to the possible deviation in the subsequent implementation (e.g., placement and routing) of the circuit. In one aspect of the present invention, a method to design a circuit includes: determining likelihood of a design constraint being violated in an implementation of a first circuit design (e.g., a technology specific netlist with or without a placement solution); and, modifying the first circuit design to reduce the likelihood of the design constraint being violated. In one example, the implementation of the first circuit design includes a routing solution for implementing the first circuit design; and, the first circuit is modified through sizing an instance of a logic element, buffering a signal, load shielding for a signal, or other operations.Type: ApplicationFiled: March 29, 2012Publication date: July 19, 2012Inventors: Champaka Ramachandran, Andrew Crews, Kenneth S. McElvain
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Patent number: 8151228Abstract: Methods and apparatuses to automatically modify a circuit design (e.g., a synthesis solution) according to the sensitivity in design parameters with respect to the possible deviation in the subsequent implementation (e.g., placement and routing) of the circuit. In one aspect of the present invention, a method to design a circuit includes: determining likelihood of a design constraint being violated in an implementation of a first circuit design (e.g., a technology specific netlist with or without a placement solution); and, modifying the first circuit design to reduce the likelihood of the design constraint being violated. In one example, the implementation of the first circuit design includes a routing solution for implementing the first circuit design; and, the first circuit is modified through sizing an instance of a logic element, buffering a signal, load shielding for a signal, or other operations.Type: GrantFiled: December 11, 2006Date of Patent: April 3, 2012Assignee: Synopsys, Inc.Inventors: Champaka Ramachandran, Andrew Crews, Kenneth S. McElvain
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Patent number: 7251800Abstract: Methods and apparatuses to automatically modify a circuit design according to the possible deviation in the subsequent implementation of the circuit. In one aspect, a method to design a circuit includes: determining whether a design constraint is likely to be violated during a subsequent routing implementation of a design of the circuit; and, modifying the design of the circuit to reduce likelihood of the design constraint being violated during a subsequent implementation. For example, a route for a net with a number of fanout larger than two and on a timing critical or near-critical path may be considered sensitive to route topology such that an alternative routing path may lead to a violation in timing constraint; to reduce the possibility of a timing problem in a subsequent routing solution, a transformation can be selectively applied to the circuit design to an extent not worsening a cost function.Type: GrantFiled: May 27, 2004Date of Patent: July 31, 2007Assignee: Synplicity, Inc.Inventors: Kenneth S. McElvain, Andrew Crews, Champaka Ramachandran
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Publication number: 20070089074Abstract: Methods and apparatuses to automatically modify a circuit design (e.g., a synthesis solution) according to the sensitivity in design parameters with respect to the possible deviation in the subsequent implementation (e.g., placement and routing) of the circuit. In one aspect of the present invention, a method to design a circuit includes: determining likelihood of a design constraint being violated in an implementation of a first circuit design (e.g., a technology specific netlist with or without a placement solution); and, modifying the first circuit design to reduce the likelihood of the design constraint being violated. In one example, the implementation of the first circuit design includes a routing solution for implementing the first circuit design; and, the first circuit is modified through sizing an instance of a logic element, buffering a signal, load shielding for a signal, or other operations.Type: ApplicationFiled: December 11, 2006Publication date: April 19, 2007Inventors: Champaka Ramachandran, Andrew Crews, Kenneth McElvain
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Patent number: 7178118Abstract: Methods and apparatuses to automatically modify a circuit design (e.g., a synthesis solution) according to the sensitivity in design parameters with respect to the possible deviation in the subsequent implementation (e.g., placement and routing) of the circuit. In one aspect of the present invention, a method to design a circuit includes: determining likelihood of a design constraint being violated in an implementation of a first circuit design (e.g., a technology specific netlist with or without a placement solution); and, modifying the first circuit design to reduce the likelihood of the design constraint being violated. In one example, the implementation of the first circuit design includes a routing solution for implementing the first circuit design; and, the first circuit is modified through sizing an instance of a logic element, buffering a signal, load shielding for a signal, or other operations.Type: GrantFiled: May 21, 2004Date of Patent: February 13, 2007Assignee: Synplicity, Inc.Inventors: Champaka Ramachandran, Andrew Crews, Kenneth S. McElvain
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Publication number: 20040243953Abstract: Methods and apparatuses to automatically modify a circuit design (e.g., a synthesis solution) according to the sensitivity in design parameters with respect to the possible deviation in the subsequent implementation (e.g., placement and routing) of the circuit. In one aspect of the present invention, a method to design a circuit includes: determining likelihood of a design constraint being violated in an implementation of a first circuit design (e.g., a technology specific netlist with or without a placement solution); and, modifying the first circuit design to reduce the likelihood of the design constraint being violated. In one example, the implementation of the first circuit design includes a routing solution for implementing the first circuit design; and, the first circuit is modified through sizing an instance of a logic element, buffering a signal, load shielding for a signal, or other operations.Type: ApplicationFiled: May 21, 2004Publication date: December 2, 2004Inventors: Champaka Ramachandran, Andrew Crews, Kenneth S. McElvain
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Publication number: 20040243964Abstract: Methods and apparatuses to automatically modify a circuit design according to the possible deviation in the subsequent implementation of the circuit. In one aspect, a method to design a circuit includes: determining whether a design constraint is likely to be violated during a subsequent routing implementation of a design of the circuit; and, modifying the design of the circuit to reduce likelihood of the design constraint being violated during a subsequent implementation. For example, a route for a net with a number of fanout larger than two and on a timing critical or near-critical path may be considered sensitive to route topology such that an alternative routing path may lead to a violation in timing constraint; to reduce the possibility of a timing problem in a subsequent routing solution, a transformation can be selectively applied to the circuit design to an extent not worsening a cost function.Type: ApplicationFiled: May 27, 2004Publication date: December 2, 2004Inventors: Kenneth S. McElvain, Andrew Crews, Champaka Ramachandran