Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-09-04
1999-07-13
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327545, 323312, G05F 110
Patent
active
059232099
ABSTRACT:
A trimmable current cell and method for providing an output current at a desired level which may be used to provide a particular current level for a digital-to-analog converter. The cell includes a first circuit with two fixed resistors connected in series which initially establish the output current, and a second circuit for trimming the output current from the first circuit to the desired level. The second circuit has a series-connected pair of trimmable resistors whose common node is connected to the first circuit at a common node between the fixed resistors. Trimming one of the trimmable resistors increases the output current to the desired level and trimming the other of the trimmable resistors decreases the output current to the desired level.
REFERENCES:
patent: 4055773 (1977-10-01), Schoeff
patent: 4766366 (1988-08-01), Davis
patent: 4931665 (1990-06-01), Yee
patent: 5049834 (1991-09-01), Kasai
patent: 5281866 (1994-01-01), Rundel
patent: 5300877 (1994-04-01), Tesch
Price Burt L.
Tesch Bruce J.
Callahan Timothy P.
Harris Corporation
Luu An T.
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