Browse Prior Art Database

Sense Amplifier Set Control

IP.com Disclosure Number: IPCOM000101885D
Original Publication Date: 1990-Sep-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Dreibelbis, JH: AUTHOR [+4]

Abstract

A method is described by which high-density, high-performance static random-access memories (SRAMs) with latched sense amplifiers adjust to or "track" process parameters guaranteeing adequate signal differential at sense time.

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This is the abbreviated version, containing approximately 52% of the total text.

Sense Amplifier Set Control

       A method is described by which high-density,
high-performance static random-access memories (SRAMs) with latched
sense amplifiers adjust to or "track" process parameters guaranteeing
adequate signal differential at sense time.

      The general approach to sense amplifier set control is to
construct a dummy system that mimics the operation of the primary
word decoding and signal generation paths, i.e., a dummy word decode
system, dummy wordline, dummy bitline, dummy cells, and a set
circuit. To im- prove this technique and assure that the worst-case
conditions are allowed for, each of these components is integrated
into the layout of each quadrant. The entire word decode and signal
generation path has a corresponding dummy element that is identical
to the primary. This technique results in a set sense amplifier
function that is independent by quadrant.

      Referring to the figure, a dummy wordline is placed at the end
of the word decode column, and the dummy bit line is placed at the
end of the dummy word line. The number of dummy cells is adjusted to
give the desired signal at set time for the worst-case (first) sense
amplifier in the sense column. This sense amplifier is worst-case
since its bitlines receive the wordline signal last and the set
signal first.

      The dummy word decode path is designed to duplicate the primary
word decode path, generating a dummy word block signal that is
identical to the primary word block signal. To gu...