IP Library › Granted Patent US 9,641,133
Granted Patent B2
US 9,641,133 · App. 15/218,463 · Granted May 2, 2017

Adaptive rail power amplifier technology

Inventor: James K. Waller, Jr. (Clarkston, MI)
H03F1/0238H03F1/0233H03F3/183H03F3/217H04R3/00H03F2200/375
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Quick Facts
Patent No.
US 9,641,133
App. No.
15/218,463
Granted
May 2, 2017
Kind
B2
Abstract

Adaptive rail power amplifier technology processes an audio signal by feeding the audio signal to the power amplifier to produce an output signal, applying positive and negative power supply voltages centered with respect to the audio signal to the positive and negative power supply rails of the power amplifier, comparing the output signal with the positive and negative power supply rail voltages to produce dynamically varying positive and negative control signals, feeding the positive and negative control signals to positive and negative high current charge pumps and adding supplemental positive and negative voltages from the positive and negative charge pumps to the positive and negative power supply rails to produce a linear adaptive rail voltage which tracks the output signal.

Claims (6)

1. A method for processing an audio signal comprising the steps of:

feeding the audio signal to a power amplifier to produce an output signal;

applying positive and negative power supply voltages centered with respect to the audio signal to positive and negative power supply rails of the power amplifier, respectively;

comparing the output signal with the positive and negative power supply rail voltages to produce dynamically varying positive and negative control signals, respectively;

feeding the positive and negative control signals to positive and negative high current charge pumps, respectively; and

adding supplemental positive and negative voltages from the positive and negative charge pumps to the positive and negative power supply rails, respectively, to produce a linear adaptive rail voltage which tracks the output signal.

Continuity (3)
Continuation 13859889 · Apr 10, 2013
Provisional Application 61622696 · Apr 11, 2012
Related Publication 20160336902A1 · Nov 17, 2016