Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-04-19
2008-10-14
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C323S316000
Reexamination Certificate
active
07436248
ABSTRACT:
A current driving circuit includes a bias voltage generator that generates a bias voltage and multiple constant current drivers that output driving currents. Each constant current driver includes first and second transistors coupled in series between two power supply potentials, and a third transistor that forms a current mirror with the second transistor. The control terminal of the first transistor receives the bias voltage. The control terminals of the second and third transistors are both connected to the node at which the first and second transistors are interconnected. This circuit configuration makes the output current, which is obtained from the third transistor, comparatively immune to fabrication process variations and variations in power-supply potentials.
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Hiltunen Thomas J
Oki Electric Industry Co. Ltd.
Studebaker Donald R.
Studebaker & Brackett PC
Wells Kenneth B.
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