Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Reexamination Certificate
2005-11-09
2010-10-05
Lam, Tuan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
C327S538000, C345S076000, C345S098000
Reexamination Certificate
active
07808284
ABSTRACT:
An object of the present invention is to eliminate fluctuation in the value of the constant current I even if there is characteristic fluctuation in field effect transistors and at the same time, to improve the power consumption. There are provided with a plurality of current mirror circuits consisting of those on the reference side and on the mirror side; current holding capacitors21a, 21band21cprovided on the respective mirror sides of the plurality of current mirror circuits; sequential selection means23, 24a, 24band24cfor selecting the plurality of current mirror circuits sequentially by a constant period; first switching means22a, 22band22cfor connecting respective reference sides and mirror sides of the plurality of current mirror circuits; reference voltage change-over means23, 25and26for changing over reference voltages of constant current generation units5, 7and8such that currents on the mirror sides become constant in conformity with the selection period of the plurality of current mirror circuits; and second switching means20a, 20band20cfor connecting the constant current generation units5, 7and8to the reference sides of the plurality of current mirror circuits in conformity with the selection period.
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Lam Tuan
Rader & Fishman & Grauer, PLLC
Sony Corporation
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