Method for predicting an output current of a transistor
AssigneeRohm Co., Ltd.
InventorEiichi Sakao
Life of this patent
Estimating the term…
Abstract
An output current of a transistor can be predicted by a method of the present invention. A direct current amplification factor H.sub.FE (I.sub.D) of the transistor is varied depending on the output current. H.sub.FE0 is a direct current amplification factor of the transistor at a predetermined output current. H.sub.FE (I.sub.D)/H.sub.FE0 is drawn on a graph. A value of an output current at a driving voltage is obtained by regarding the factor as a predetermined value. The value is plotted on the graph and a straight line is drawn between the plotted value and an origin of the graph. An output current at an intersection of a curve of H.sub.FE (I.sub.D)/H.sub.FE0 and a straight line.
Claims7
A method for predicting an output current of a transistor, comprising:
- a first step of obtaining a relationship between a direct current amplification factor and an output current of a transistor;
- a second step of drawing on a graph a curve representative of a ratio of said direct current amplification factor to a direct current amplification factor of a predetermined value for said output current from said relationship obtained in the first step;
- a third step of obtaining an output current at a driving voltage to drive said transistor by regarding the direct current amplification factor as a direct current amplification factor of a predetermined value;
- a fourth step of plotting a value of the output current obtained in the third step on the graph on a same scale as the output current of the graph obtained in the second step and connecting the plotted value to an origin where the output current is zero by a straight line;
- and
- a fifth step of reading out an output current at an intersection of the curve in the second step and the straight line in the fourth step.
Dependencies are inferred from the claim text.