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Interdigitated I/sup 2/L structures

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2 Author(s)

The isolation of I/SUP 2/L structures in a conventional bipolar LSI technology is provided by a shallow or a deep n/SUP +/ collar. If part of this collar is replaced with an injector, an interdigitated I/SUP 2/L structure results. The structure has less delay at intermediate current levels compared to the conventional I/SUP 2/L layout. The reduction in delay is significant if the replaced collar is a shallow n/SUP +/. This improved performance is obtained at the expense of packing density. This correspondence presents the structure and analyzes its performance.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:13 ,  Issue: 6 )