Amplifiers – With semiconductor amplifying device – Including class d amplifier
Patent
1993-06-28
1994-07-12
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including class d amplifier
330146, H03F 3217
Patent
active
053292456
ABSTRACT:
The invention provides a high power, low distortion, high efficiency ampler design incorporating a high efficiency switching amplifier used in conjunction with a linear difference amplifier. The high efficiency switching amplifier, typically of full or half bridge design, is designed to generate a high efficiency, arbitrarily formed, wave portion such as a square wave. The high efficiency waveform is scaled down and is compared to a desired reference, such as a sinusoid. The output of the comparison is the analog difference (mathematical subtraction) between the reference waveform and the scaled-down switch amplifier output wave. This "difference" signal is then used to drive the linear difference amplifier which simply scales the signal linearly. The two power signals, one from the switching amplifier and the other from the linear difference amplifier, are then summed magnetically. To permit a low harmonic output, the input signals to the switching amplifier and the reference are locked together in frequency.
REFERENCES:
patent: 3325742 (1963-08-01), Moriyasu
patent: 3908170 (1975-09-01), Buhler
patent: 3995226 (1976-11-01), Berning
patent: 4152661 (1979-05-01), Zeis
patent: 4163198 (1979-07-01), Berning
patent: 4324950 (1982-04-01), Strickland
patent: 4523152 (1985-06-01), Garde
patent: 5148116 (1992-09-01), Robinson
Hammond Russell E.
Johnson Leopold J.
Fendelman Harvey
Keough Thomas Glenn
Lipovsky Peter A.
Mottola Steven
Nguyen Tiep
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