This paper presents an efficient method for optimizing power/ground (P/G) networks by widening wires and adding decoupling capacitors (decaps). It proposes a structured skeleton that is intermediate to the conventional method that uses full meshes (which are hard to analyze efficiently), and tree- structured networks (which provide poor performance). As an example, we consider a P/G network structure modeled as an overlying mesh with underlying trees originating from the mesh, which eases the task of analysis with acceptable performance sacrifices. A fast and efficient event-driven P/G network simulator is proposed, which hierarchically simulates the P/G network with an adaptation of PRIMA to handle non-zero initial conditions. An adjoint network that incorporates the variable topology of the original P/G network, as elements switch in and out of the network, is constructed to calculate the transient adjoint sensitivity over multiple intervals. The gradients of the most critical node with respect to each wire width and decap are used by a sensitivity-based heuristic optimizer that minimizes a weighted sum of the wire and the decap area. Experimental results show that this procedure can be used to efficiently optimize large networks.
|Original language||English (US)|
|Title of host publication||IEEE/ACM International Conference on Computer Aided Design|
|Subtitle of host publication||A Conference for the EE CAD Professional, ICCAD 2000|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|State||Published - 2000|
|Event||IEEE/ACM International Conference on Computer Aided Design, ICCAD 2000 - San Jose, United States|
Duration: Nov 5 2000 → Nov 9 2000
|Name||IEEE/ACM International Conference on Computer-Aided Design, Digest of Technical Papers, ICCAD|
|Other||IEEE/ACM International Conference on Computer Aided Design, ICCAD 2000|
|Period||11/5/00 → 11/9/00|
Bibliographical notePublisher Copyright:
© 2000 IEEE.