Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Reexamination Certificate
2009-01-19
2010-11-09
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
C330S279000
Reexamination Certificate
active
07830209
ABSTRACT:
A charge pump power supply for a consumer device audio power stage has an efficiency selected according to signal level. The frequency of operation of the charge pump and/or the effective size of a switching transistor bank is adjusted based upon a volume (gain) setting, or a detected signal level, so that internal power consumption of the charge pump is reduced when high output current is not required from the audio power stage and consequently from the charge pump. Operating modes of the charge pump are selected by the signal level indication and include at least a high power and a high efficiency mode selected by setting the charge pump operating frequency and/or enabling or disabling switching of one or more of multiple parallel transistors used to implement each switching element of the charge pump, thereby setting the level of gate capacitance being charged/discharged by the gate driver circuit(s).
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Quilter, Patrick “Amplifier Anatomy”, QSC Audio Products, published in Sound & Video Contractor Feb. 20, 1993.
Allen Daniel John
Woodford Scott Allan
Choe Henry K
Cirrus Logic Inc.
Harris Andrew M.
Mitch Harris Atty at Law, LLC
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