PRITI: Estimation of maximal currents and current derivatives incomplex CMOS circuits using activities waveforms

摘要

Information about the maximal currents and maximal currentnderivatives is required to be able to estimate and limit resistive andninductive voltage drops in the on-chip power/ground wires and thenbonding wires. After rigorously defining the required information in annoriginal way, a linear-complexity pattern-independent method for itsncomputation is proposed. The concept of an activity waveform wasnintroduced, which allowed the translation of the overall problem intonproblems for the subnetworks. The landing of a subnetwork was thenndiscussed. A comparison with the simulation of random input-patterns hasnshown the applicability of the proposed method for real-life VLSInbuilding blocks of up to 15 K transistors. In addition, it has beennshown that the Imax(t) and I'max(t) estimates are for these examples anfactor of two to five better than the estimates used in industrialnpractice