Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2011-03-15
2011-03-15
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S288000
Reexamination Certificate
active
07907012
ABSTRACT:
A current mirror circuit provided in an emitter follower configuration achieves linear output currents over a range of input currents by operating in response to a bias current that is a replica of the input current. The current mirror may include a pair of transistors and a pair of resistors, in which: a first resistor and a base of a first transistor are coupled to a first input terminal for a first input current, an emitter of the first transistor and a base of the second transistor are coupled to a second input terminal for a second input current, the first and second input currents being replicas of each other, an emitter of the second transistor being coupled to the second resistor, a collector of the second transistor being coupled to an output terminal of the current mirror, and a collector of the first transistor and the two resistors are coupled to a common node.
REFERENCES:
patent: 6515546 (2003-02-01), Liwinski
patent: 6753734 (2004-06-01), Arell et al.
patent: 6842075 (2005-01-01), Johnson et al.
David Johns et al., Analog Integrated Circuit Design, (1997), pp. 125-180, 256-303, published by J. Wiley & Sons, Inc., U.S. and Canada.
Analog Devices Inc.
Choe Henry K
Kenyon & Kenyon LLP
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