Amplifiers – Variable impedance for signal channel controlled by separate...
Reexamination Certificate
2009-10-02
2011-10-04
Mottola, Steven J (Department: 2817)
Amplifiers
Variable impedance for signal channel controlled by separate...
C330S284000
Reexamination Certificate
active
08030996
ABSTRACT:
A circuit and method for automatic level control is provided. The circuit includes an amplifier including a variable resistance circuit that is connected between a first node and a second node. The circuit also includes a first resistance circuit that is connected between a first input node and the first node, and a second resistance circuit that is connected between the first input node and a first op amp node. The first and second resistance circuits are at least approximately linear elements. The circuit also includes an op amp having at least a first input that is connected to the first op amp input node.
REFERENCES:
patent: 7719339 (2010-05-01), Romani
Product Brief “Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers, Speaker Protection and No Clip with Clip Control”, Apr. 16, 2009, 4 pages.
Frommer & Lawrence & Haug LLP
Gaffney Matthew M.
Mottola Steven J
National Semiconductor Corporation
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