Current source cell arrangement and digital-to-analog converter

Details Current source cell arrangement and digital-to-analog converter Current source cell arrangement and digital-to-analog converter

2006-12-06

2008-09-02

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

Reexamination Certificate

active

07420495

ABSTRACT:
An object of the present invention is to form a highly accurate current source for D/A converters. Letters from a1to anwhere n is at least 4 represent current source cells that output constant currents, each of which is composed of MOS transistors etc. These current source cells are arranged in two dimensional matrix and a plurality of these current source cells are connected to form a current source that has a predetermined current value. Current source cells in any one row of the two dimensional matrix are labeled with letters from a1to an. A first kind of row is in the same order as this row. A second kind of row is obtained from the first kind of row by exchanging a series of elements being letters from aito ai+jwhere both i and j are integers at least 1 and i+j is an integer not more than n/2 with a series of elements being letters from akto ak+jwhere k is an integer larger than n/2 and k+j is an integer not more than n. The two dimensional matrix comprises a same number of these two kinds of row.

REFERENCES:
patent: 6100833 (2000-08-01), Park
patent: 6433721 (2002-08-01), Katada
patent: 6452527 (2002-09-01), Takeya et al.
patent: 6703956 (2004-03-01), Mueller et al.
patent: 7026967 (2006-04-01), Eloranta
patent: 2002-9247 (2002-01-01), None

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