Title:
IMPROVED POWER SUPPLY REJECTION FOR PULSE WIDTH MODULATED AMPLIFIERS AND AUTOMATIC GAIN CONTROL
Document Type and Number:
WIPO Patent Application WO2005067609
Kind Code:
A3
Abstract:
A circuit according to the present invention improves the power supply rejection ratio for a pulse width modulated digital amplifier and can be used as a compressor and/or limiter. The circuit preferably operates by using voltage level translation to vary the amplitude of a triangle wave in response to changes in power supply voltage prior to input of the wave into a comparator of the PWM device. Because the circuit operates to improve power supply rejection, little or no distortion is introduced into the signal when used as a compressor and/or limiter. Additionally, the circuit is optionally implemented in a Class D amplifier, and provides a lower cost of implementation than conventional designs in such implementations.
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Inventors:
ZEPP DAVID (US)
Application Number:
PCT/US2005/000333
Publication Date:
July 06, 2006
Filing Date:
January 07, 2005
Export Citation:
Assignee:
ALTEC LANSING TECHNOLOGIES INC (US)
International Classes:
H03F3/217; H03F1/30; H03F1/32; H03G7/00
Foreign References:
| US20050083115A1 | 2005-04-21 | |||
| US6384678B2 | 2002-05-07 |
Other References:
See also references of EP 1709733A4
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