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Switch-level timing simulation based on two-connected components

  • US 5,305,229 A
  • Filed: 09/06/1991
  • Issued: 04/19/1994
  • Est. Priority Date: 09/06/1991
  • Status: Expired due to Term
First Claim
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1. A method of simulating a circuit of transistors and reference terminals and determining driving-point resistances in linear time and space, said method comprising the steps, executed by a data processor having memory means, ofgenerating a model of the transistor circuit as an RC-network representation of the transistor circuit, said representation being other than an RC-tree network and comprising a plurality of switches each corresponding to a different one of the transistors and each of the switches containing a gate and two nodes connected by a corresponding channel having a resistance value such that each channel is considered conducting or nonconducting according to the state of the corresponding gate;

  • storing in said circuit memory means said representation of the transistor circuit including said resistance value for each of said channels;

    defining a state configuration for a given state of the RC-network representation, the defined state configuration containing channels which would be considered conducting in that given state and nodes connected to the conducting ones of the channels;

    determining, from the resistance values for the channels in the defined state configuration, the driving point resistances between each of the nodes in the defined state configuration and the reference terminals; and

    each of said nodes having a corresponding capacitance value, determining the delay for the transition from the given state tot he next state from the driving point resistances in the defined state configuration and from the capacitance values of the nodes contained in the defined state configuration;

    whereby the time required for said method is essentially proportional to the number of nodes and the circuit memory means required for said method is also essentially proportional to the number of nodes.

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