Two-dimensional symmetric thermometer matrix decoder of digital/

Details Two-dimensional symmetric thermometer matrix decoder of digital/ Two-dimensional symmetric thermometer matrix decoder of digital/

1992-12-29

1995-09-26

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

H03M 166

Patent

active

054537436

ABSTRACT:
A two-dimensional symmetric thermometer matrix decoder of digital/analog converter reduces an integral non-linearity error due to the current gradient of the current sources by making the current sources two-dimensional and symmetrical when selecting the current sources. Up until now, the number of current sources had to be smaller than a half the amount of the current that flows when one current source is activated, and the number of digital bits of a digital/analog converter that can be increased used to be limited because an integral non-linearity error value becomes larger as the number of the current sources increases. To solve such problems, the present invention activates a current source located in the center of the current source array, and then two current sources located on the right and the left side of the centrally located current source are activated. Also, for the rows which are a group of current sources, a centrally located row is activated first and then the rows located above and below are symmetrically activated so that the next current sources mutually offset the error with each other, thereby reducing an integral non-linearity error. By doing so, a converter with a higher-resolution can be manufactured.

REFERENCES:
patent: 4393370 (1983-07-01), Hareyama
patent: 4490634 (1984-12-01), Hareyama
patent: 4665381 (1987-05-01), Masuda et al.
patent: 4910514 (1990-03-01), Irmer et al.
patent: 5057838 (1991-10-01), Tsuji et al.
patent: 5105193 (1992-04-01), Vogt et al.

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