Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-08-16
2005-08-16
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
C327S108000, C327S563000
Reexamination Certificate
active
06930542
ABSTRACT:
A current source circuit with differential gain boosting is provided. The current source circuit differentially provides first and second currents. The first current is produced by a first cascoded current source, and the second current is produced by a second cascoded current source. Each of the cascoded current sources comprises a current source transistor and a cascode transistor. The current source circuit has high output impedance because a voltage associated with a gate of the cascode transistor of the first cascoded current source and another voltage associated with a gate of a cascode transistor of the second cascoded current source are each forced to an approximately constant voltage by a differential amplifier. The drain voltage of the first and second current source transistors are each servoed to the saturation drain to source voltage of the first current source transistor.
REFERENCES:
patent: 4292584 (1981-09-01), Kusakabe
patent: 5337021 (1994-08-01), Zarabadi et al.
patent: 5748040 (1998-05-01), Leung
patent: 6177838 (2001-01-01), Chiu
patent: 6831501 (2004-12-01), Aude
Gray et al, “Analysis and Design of Analog Integrated Circuits,” Fourth Edition, pp. 273-274.
Callahan Timothy P.
Darby & Darby P.C.
Englund Terry L.
Gaffney Matthew M.
National Semiconductor Corporation
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