Low pass filter for output of D-class amplifier

Details Low pass filter for output of D-class amplifier Low pass filter for output of D-class amplifier

2005-04-19

2005-04-19

Pascal, Robert (Department: 2817)

Amplifiers

Miscellaneous

Amplifier protection means

C330S251000, C330S306000

Reexamination Certificate

active

06882222

ABSTRACT:
Low pass filters at the output stage of a D-class amplifier, in which a high channel separation between adjacent signal amplifying channels, a small size, implementation at a high density can be attained. Induced electromotive forces by a leakage magnetic flux from the adjacent channels are set off by a plurality of pairs of inductors in one low pass filter. The low pass filter of each channel is formed by the same construction and the same circuit. The inductors are arranged in a manner that center axes of coils of the two corresponding pairs of inductors in the adjacent channels are located at vertexes of a rectangular parallelogram, and combinations of the winding directions of the coils of the corresponding inductors of the adjacent channels are set to the same direction and the opposite directions every other inductor.

REFERENCES:
patent: 5113145 (1992-05-01), Ideler et al.
patent: 6229388 (2001-05-01), Nalbant
patent: 6392476 (2002-05-01), Rodriguez
European Search Report dated Nov. 21, 2003.
“IPA032D02 Class-D Stereo Audio Amplifier Evaluation Module, SL0U066”, Apr. 2000, Texas Instruments, pp. 1.1-3.30.

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