Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2007-06-05
2007-06-05
Nguyen, Patricia (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S20700P, C330S151000, C375S238000
Reexamination Certificate
active
11138896
ABSTRACT:
An electronic class-D amplifier including a pulse width modulator and a servo-loop amplifier characterized in that there is provided a sample and hold element which samples a signal at the sample input when a sample command signal is applied to a control input, and holds the value of the last sampled value of the signal at the sample input when a hold command signal is applied to the control input, and the output of the sample and hold element is connected to a modulation input of the pulse width modulator wherein a negative feedback path connects an output of the output switching stage to an input of the servo-loop amplifier.
REFERENCES:
patent: 4042890 (1977-08-01), Eckerle
patent: 5617058 (1997-04-01), Adrian et al.
patent: 6064259 (2000-05-01), Takita
patent: 6127885 (2000-10-01), Colangelo
patent: 6552606 (2003-04-01), Veltman et al.
patent: 6987851 (2006-01-01), Toumani et al.
BHC Consulting Pty., Ltd.
Nguyen Patricia
Osha & Liang LLP
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