High speed common mode logic circuit

Details High speed common mode logic circuit High speed common mode logic circuit

1998-07-16

2000-07-25

Santamauro, Jon

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Field-effect transistor

326119, 326 54, 327307, 327208, H03K 19094

Patent

active

060940743

ABSTRACT:
A common mode logic (CML) circuit having an improved bias circuit and an active MOS load operating exclusively in the triode region to provide improved performance characteristics including a high speed of operation. The bias circuit of the CML circuit comprises a pair of MOS transistors, one of which has an aspect ratio (W.sub.P /L.sub.P) and the other of which has an aspect ratio (W.sub.P /L.sub.P)
, wherein 1<n<4. This configuration causes a third MOS transistor in the bias circuit to operate exclusively in the triode region. The CML circuit also includes a logic portion, which may be a logic gate or flip-flop, having a plurality of pairs of input MOS transistors for receiving differential input signals. In accordance with the invention, the logic portion has load MOS transistors which operate exclusively in the triode region.

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