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Cost Performance Logic Circuits

IP.com Disclosure Number: IPCOM000048984D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Robbins, GJ: AUTHOR

Abstract

Disclosed is a communicable SCS + CCS (Schottky Current Switch and Cascode Current Switch) circuit family. The implementation uses ground up power supplies of 1.7 and 3.4 volts.

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Cost Performance Logic Circuits

Disclosed is a communicable SCS + CCS (Schottky Current Switch and Cascode Current Switch) circuit family. The implementation uses ground up power supplies of 1.7 and 3.4 volts.

The approach allows both single-level and double-level current switch circuits on the same circuit chip. This affords complex functions of a double-level current switch to best advantage, e.g., latches, shift register latches, multiplexers and complex combinatorial functions. Single-level current switch functions are used for clock powering, gating and simple functions.

If a simple function can be performed by an SCS circuit, the function will take less than 1/2 the power of doing the function in CCS. Similarly, complex functions implemented in CCS have a definite power, area and delay advantage over their SCS counterparts. This chip organization and circuit approach will support both types of circuits intermixed in any ratio.

As depicted in the drawing, a common most positive power supply allows an SCS to communicate directly with an upper-level CCS circuit, and vice versa (no voltage transitions required in most communications).

The SCS or CCS circuit can talk to a lower level CCS through transistor/SBD (Schottky barrier diode) voltage converter circuit (note optional current source resistor). SCS VREF equals CCS VREF upper equals +3.07 V single Reference

Supply.

SCS lower power supply equals CCS.

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