Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-08-07
2007-08-07
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S267000
Reexamination Certificate
active
11178931
ABSTRACT:
A class AB amplifier capable of easily controlling the amount of quiescent current and the amount of amplifier output current. The amplifier includes an input circuit that transform a voltage difference between input signals into a current; a current mirror including the (the Pull Up and Pull Down transistors of the) output circuit of the amplifier controls the quiescent current through the Pull Up and Pull Down transistors output circuit; and a control circuit in the current mirror (to which a first control voltage and a second control voltage are applied), adjusts the amount of quiescent current flowing through the output circuit in a first operating mode (by controlling a first bias current that is proportionate to the quiescent current in the current mirror), and controls the amount of the output current sourced or sinked (in response to the change in the voltages at the first and second output nodes of the input circuit) in a second operating mode. The first and second control voltages are DC voltages supplied from the outside of the class AB amplifier, and the amount of first bias current is determined by the first control voltage. The amounts of quiescent current and output current can be easily controlled.
REFERENCES:
patent: 4284957 (1981-08-01), Haque
patent: 4335355 (1982-06-01), Haque
patent: 4737732 (1988-04-01), Westwick
patent: 5311145 (1994-05-01), Huijsing et al.
patent: 5325069 (1994-06-01), Sundby
patent: 6384683 (2002-05-01), Lin
patent: 6714076 (2004-03-01), Kalb
patent: 2001-160722 (2001-06-01), None
patent: 1020010030408 (2001-04-01), None
Choe Henry
F. Chau & Assoc. LLC
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