Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Reexamination Certificate
2011-05-17
2011-05-17
Nguyen, Hieu P (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
C330S123000
Reexamination Certificate
active
07944302
ABSTRACT:
An apparatus and method for biasing each amplifier of an amplification stage provides that the voltage across each current sensing element of each amplifier of the amplification stage is measured. For each pair of voltage measurements taken, a sum and difference is calculated, where the sum is processed to determine minima peaks and the difference is averaged. A portion of the sum term and the average of the difference term are summed to yield the individual bias current conducted by a first amplifier of the amplification stage. The difference between a portion of the sum term and the average of the difference term is calculated to yield the individual bias current conducted by the second amplifier of the amplification stage. The bias current conducted by the first and second amplifiers may then be individually modified manually, or conversely, may be modified automatically based upon the bias current measurements taken.
REFERENCES:
patent: 4439743 (1984-03-01), Schwarz et al.
patent: 5424683 (1995-06-01), Takahashi
patent: 7205834 (2007-04-01), Goto
patent: 7368992 (2008-05-01), Sandquist
Fender Musical Instruments Corporation
Nguyen Hieu P
Robert D. Atkins Patent Law Group
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