Digital-to-analog-converter
AssigneeMotorola, Inc.
InventorsMasami Aiura, Satoshi Takahashi, Yuichi Nakatani
Life of this patent
Estimating the term…
Abstract
It is an objective to provide a digital-to-analog converter circuit that allows the value of the current output from each current source cell to be identical, regardless of the position of that current source cell relative to the power supply line. To ensure that the voltages supplied to the respective current source cells are identical, the power supply lines La and Lb are disposed in the form of a right triangle modified such that their line widths W1 and W2 become constantly narrower on one side depending on the position at which the power supply lines La and Lb are formed. The power supply lines La and Lb are also disposed such that their hypotenuses are opposite to each other.
Claims6
A digital-to-analog converter circuit, wherein a plurality of current source cells having a first constant current source and a second constant current source are arranged in one direction;
- a first power supply line corresponding to the first constant current source of the respective current source cell and a second power supply line corresponding to the second constant current source of the respective current source cell are arranged in such a direction that the current source cells are arranged;
- a changeover switch disposed respectively for a respective current source cell selectively operated in accordance with digital input data so that an output current from the current source cell is output to either of a first analog output line or a second analog output line, said digital-to-analog converter circuit characterized by:
- line widths of said first and second power supply lines being modified depending upon the position at which they are formed, respectively, so that an average value of the voltages supplied to said respective current source cells becomes uniform.
Dependencies are inferred from the claim text.