Digital to analog converter and bias circuit therefor for provid

Details Digital to analog converter and bias circuit therefor for provid Digital to analog converter and bias circuit therefor for provid

1997-01-31

1998-11-17

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341145, 341118, H03M 166

Patent

active

058382712

ABSTRACT:
A b-bit digital and analog converter of the present invention is relatively simple and non-expensive and monotonic with relatively high differential and integral non-linearities. The converter uses weighed current ratio to achieve decrease the number of current cells to provide a cumulative current which corresponds to the digital value on the input data bus. The converter includes preferably a plurality of upper current cells, at least one unit current cell and at least one lower current cell. The currents produced by the upper, lower and unit current cells have a predetermined weighed current ratio, and the number of the upper, unit and lower current cells are based on the weighed current ratio. Further, the plurality of upper current cells have a prescribed layout, and includes a group of cells where each current cell has reverse layout orientation compared to adjacent cells.

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