Digital to analog converter and bias circuit therefor

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

1997-01-31

1998-12-01

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341118, H03M 166

Patent

active

058445153

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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