Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-06-06
2006-06-06
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S558000, C323S315000
Reexamination Certificate
active
07057443
ABSTRACT:
A current circuit includes a first group and a second group of transistors whose emitters are connected via respective resistors to a voltage source. The collectors of the first-group of transistors (50, 51) are connected together to an output terminal (43) and those of the second group of transistors (70, 71) are connected together to a current source (74) that produces a constant current (I). The bases of the first and second groups of transistors are connected together to form a current mirror, so that the same constant current is drawn by the first group of transistors to the output terminal. From the output terminal, a current inversely variable with uniform resistance variations is drawn, so that a current supplied from the output terminal is a difference between the constant current and the inversely variable current. The current from the output terminal drives an active filter (10) which includes switching circuits and resistor-capacitor circuitry.
REFERENCES:
patent: 6414516 (2002-07-01), Labram et al.
patent: 6417656 (2002-07-01), Shirai
patent: 6600304 (2003-07-01), Kim
patent: 07-321602 (1995-12-01), None
patent: 10-284989 (1998-10-01), None
Callahan Timothy P.
Englund Terry L.
Hayes & Soloway P.C.
NEC Electronics Corporation
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