Circuits and methods for amplifying signals

Details Circuits and methods for amplifying signals Circuits and methods for amplifying signals

2006-06-09

2008-08-05

Choe, Henry K (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S297000

Reexamination Certificate

active

07408403

ABSTRACT:
The present invention discloses a bus pumping compensation for a pulse modulation circuit such as class D modulators. The compensation according to the present invention provides a compensation current controlled by the output voltage, with the compensation characteristics matching the reverse current for improving circuit efficiency. Embodiments of the present invention also disclose a designable compensation circuit, comprising a linear compensation current, offering a good trade-off between circuit efficiency and ease of design. The present invention compensation circuit is preferably employed in a class D amplifier with substantial reverse current, and most preferably added into a LDO power supply in a class D amplifier circuit to prevent reverse current problem. The disclosed class D amplifier circuit is preferably used in an audio media player.

REFERENCES:
patent: 6091292 (2000-07-01), Higashiyama et al.
patent: 6166596 (2000-12-01), Higashiyama et al.

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