Variable current source with deviation compensation

Details Variable current source with deviation compensation Variable current source with deviation compensation

1998-08-19

2000-02-29

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323313, 341153, G05F 316, H03M 180

Patent

active

060313668

ABSTRACT:
A variable current source using weighted current sources for preventing degradation of an accuracy of an output current due to deviations in manufacturing. The variable current source is formed by a series of binary weighted current sources having a first current source of the lowest order on a lower side with a current value equal to or lower than a tolerance current value which is a resolution for an output current. Assuming that e is a deviation rate of the variations due to manufacturing, a current value Ia.sub.k of a k.sup.th current source in current value increasing order is derived by adding a deviation to a designed current value of the current source. The current value is set to be equal to or lower than a sum of a higher deviation current value, derived by adding a deviation to a designed current value of a current source below the k.sup.th current source immediately and a lower deviation current value, derived by subtracting the deviation from the designed value of the k-1.sup.th current source, expressed by the following:

REFERENCES:
patent: 4859930 (1989-08-01), Schouwenaars et al.
patent: 5608348 (1997-03-01), Kearney et al.
patent: 5619122 (1997-04-01), Kearney et al.
patent: 5668550 (1997-09-01), Coleman, Jr..
patent: 5854563 (1998-12-01), Oh et al.

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