Amplifier circuit

Details Amplifier circuit Amplifier circuit

2006-06-27

2006-06-27

Shingleton, Michael (Department: 2817)

Amplifiers

With periodic switching input-output

C330S010000, C330S20700P, C330S251000

Reexamination Certificate

active

07068095

ABSTRACT:
The invention is directed to an amplifier circuit based on the principle of a class D amplifier. To avoid unwanted convolution effects and to improve the power supply rejection ratio, provision is made for the amplitude of the ramp signal used for pulse width modulation to track proportionally the supply voltage for the amplifier circuit. For this purpose, the ramp signal generator has an amplitude control input suitably connected to supply and reference potentials. This ensures a constant duty ratio which is independent of the supply voltage. The present circuit may be used, for example, as a DC/DC converter or as an audio amplifier.

REFERENCES:
patent: 5262733 (1993-11-01), Nakajima et al.
patent: 5559467 (1996-09-01), Smedley
patent: 5590033 (1996-12-01), Kawano
patent: 6016075 (2000-01-01), Hamo
patent: 6707337 (2004-03-01), Noro
patent: 2002/0060605 (2002-05-01), Kowkutla et al.
patent: 0 503 571 (1992-09-01), None
patent: 00/55966 (2000-09-01), None
Search report for PCT/DE03/02304.
“A Class D Amplifier Using MOSFETs with Reduced Minority Carrier Lifetime”, Jon Hancock, AES Journal of the Audio Engineering Society, No. 9, New York, Sep., 1991, 13 pages.
“Understanding Buck Power Stages in Switchmode Power Supplied”, Application Report, Texas Instruments, Mixed Signal Products, SLVA057, Mar., 1999, 36 pages.

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