| 摘要 |
<p>A multiple function type D/A converter utilizing a ladder type resistance circuit, and capable of other mathematical functions in addition to the D/A conversion, having a series resistance circuit consisting of N number of resistors R21 DIFFERENCE R2n each having a resistance value R connected in series between an output terminal Vo and one side of a terminal resistor Ro which has a resistance value 2R and is connected on its other side to ground, such series circuit including a resistor connecting point between each adjacent pair of resistors R0, R21 DIFFERENCE R2N, and branching in parallel therefrom N+1 number of groups of parallel resistors 01 DIFFERENCE 0n, 11 DIFFERENCE 1n, . . . N1 DIFFERENCE Nn, each containing n resistors where n is an integer greater than 1, the n resistors of each such group being all connected on one side to the same resistor connecting point with different groups thereof connected to different connecting points along such series circuit, the n resistors of each such group being individually switchable on the other side thereof alternately between ground and a reference voltage Vs by means of corresponding groups of switching circuits S01 DIFFERENCE S0n . . . SN1 DIFFERENCE SNn under the control of applied digital signals.</p> |
