Amplifiers – Modulator-demodulator-type amplifier
Reissue Patent
2002-07-10
2008-10-28
Mottola, Steven J. (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S251000
Reissue Patent
active
RE040550
ABSTRACT:
An improved Class BD amplifier provides an amplified output signal by pulse width modulation techniques by sampling a carrier wave, usually a triangular or saw tooth waveform, according to an input signal to be amplified, as in a conventional class D amplifier. The resulting sampling waveform controls the connectivity of the potential supplies34, 36to the power rails14, 18via the first switch12so that a first potential and a second potential are alternately supplied to the first power rail14and so that a third potential and fourth potential are alternately supplied to the second power rail18.As shown in FIG.8,the first potential is positive, the second and third potentials are at ground, and the fourth potential is negative. In addition, a constant potential difference is maintained between the first and second power rails14, 18.The power rails are alternately connected to a Class AD output stage26by another switch30,the connectivity of which is controlled by a second sampling waveform, PWM2. This second sampling waveform PWM2may also be derived by sampling a triangular or saw tooth carrier wave by the input signal.
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Castrejon Carlos A.
Strickland James C.
Mottola Steven J.
Rockford Corporation
Steptoe & Johnson LLP
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