Title:
HIGH-EFFICIENCY AUDIO POWER AMPLIFIER
Document Type and Number:
WIPO Patent Application WO2002015386
Kind Code:
A3
Abstract:
A high-efficiency audio power amplifier featuring a tracking power-supply and an active noise shaping unit for reducing non-linearity and audible noise. Several variations of a non-inductive switched-capacitor tracking power-supply are presented, which are well-suited to integrated-circuit implementation and battery operation, and which provide an efficient power supply for the output stage over a wide range of voltages that can exceed the voltage limits of the main power source. The output of the tracking power-supply can be fed into an analog power stage, or can be used as a Multi-Level Quantizer for generating the output directly. A feedback and noise shaping allows the use of low-cost components while relaxing design constraints. Some simple switching strategies are disclosed which offer power efficiencies in excess of 80 %.
Inventors:
SHASHOUA MEIR (IL)
Application Number:
PCT/IL2001/000748
Publication Date:
January 09, 2003
Filing Date:
August 13, 2001
Export Citation:
Assignee:
K S WAVES LTD (IL)
SHASHOUA MEIR (IL)
SHASHOUA MEIR (IL)
International Classes:
H03F1/02; H03F3/217; (IPC1-7): H03F1/56; H03F1/02; H02M3/07
Foreign References:
| US6011440A | 2000-01-04 | |||
| US5423078A | 1995-06-06 | |||
| US5892403A | 1999-04-06 | |||
| EP0721137A1 | 1996-07-10 | |||
| EP0862260A2 | 1998-09-02 | |||
| EP1120901A1 | 2001-08-01 |
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