Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-01-30
2007-01-30
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
C323S316000
Reexamination Certificate
active
10827239
ABSTRACT:
A low voltage wide ratio current mirror circuit comprises an n times current mirror having an input port for receiving an input current and an m times current mirror coupled in series to the n times current mirror for resulting in an output current of (N*M the input current) being provided to a load where at least one of N and M is other than 1. The circuit provides precision in output current for use with a low voltage power amplifier without incurring an overhead of quiescent current. The low voltage wide ratio current mirror circuit in accordance with a second embodiment of the invention includes a voltage swing reduction circuit in order to provide increased stability thereto. In additional embodiments of the invention, the load is a differential amplification stage for providing differential amplification to differential RF input signals received at first and second RF input ports thereof.
REFERENCES:
patent: 5563502 (1996-10-01), Akioka et al.
patent: 5703497 (1997-12-01), Min
patent: 6344769 (2002-02-01), Giuroiu
patent: 6472858 (2002-10-01), Tanase
patent: 6566852 (2003-05-01), Tagami et al.
patent: 6741119 (2004-05-01), Aude et al.
patent: 1 213 636 (2001-11-01), None
Callahan Timothy P.
Englund Terry L.
Kenyon & Kenyon LLP
SiGe Semiconductor (U.S.), Corp.
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