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Signal Delay in RC Trees with Charge Sharing or Leakage

Raghunathan, Arvind
Thompson, Clark D.
Technical Report Identifier: CSD-85-243
June 7, 1985

Abstract: A single value for delay, based upon the delay of Elmore, is derived for two types of RC tree networks. In one type of network, there is no driving source: this undriven situation causes static charge sharing among nodes. An expression for delay is obtained by straightforward analysis of this network.

In our second case, an RC tree which is driven by at least one source has leaky capacitors. We show how to calculate delays for such trees by a linear time algorithm.

Simple MOS circuits undergoing charge sharing and with leakage paths to ground are analyzed using the methods presented in this paper. The results are compared with those of SPICE.