Source-coupled logic with reference controlled inputs

Details Source-coupled logic with reference controlled inputs Source-coupled logic with reference controlled inputs

Filed on

1996-10-16

Date issued

1998-08-25

Examiner

Santamauro, Jon

Patent Class

Electronic digital logic circuitry

SubClass

Accelerating switching

Other Related Categories

326 34, 326115, 327 77, H03K 190944

Type

Patent

Status

active

Patent number

057986584

Description

ABSTRACT:
This invention relates to source-coupled logic (SCL) which is a functional derivative of emitter-coupled logic (ECL). ECL is widely recognized as having the characteristics of high speed (low propagation delay) and low power supply noise generation. The SCL of the prior art succeeds at maintaining and improving the low noise characteristics of this architecture but does not fulfill the promise of high speed that one would expect from a current-mode logic. In addition, it uses a differential form of logic that is not as flexible and easy-to-use as a reference controlled or "single-ended" logic. The SCL disclosed here has the desired high speed properties and maintains the ease of use that is a property of reference controlled ECL. In addition, the reference controlled SCL of this invention provides new capabilities that make it even more flexible than ECL in generating logical switching functions.

REFERENCES:
patent: 4686392 (1987-08-01), Lo
patent: 4808851 (1989-02-01), Chantepie
patent: 4833347 (1989-05-01), Rabe
patent: 5149992 (1992-09-01), Allstot
patent: 5177378 (1993-01-01), Nagasawa

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