Amplifiers – With semiconductor amplifying device – Including class d amplifier
Reexamination Certificate
2006-11-21
2006-11-21
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including class d amplifier
C330S20700P, C330S20700P
Reexamination Certificate
active
07138864
ABSTRACT:
An amplifier having output switch circuitry is described. A sense resistor is operable to transmit an output current associated with the output switch circuitry. Low-voltage circuitry is operable to provide a drive signal to the output switch circuitry. Isolation circuitry is operable to provide DC isolation between the low-voltage circuitry and the output switch circuitry. Current sensing circuitry is directly connected to the sense resistor and is operable to sense the output current in the sense resistor and generate a fault signal in response to an overcurrent condition. The fault signal is characterized by a signal level which is compatible with the low-voltage circuitry without additional DC isolation.
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Supertex, Inc., “High Voltage Pulser Circuits”, VN/VP-13 Series Application Not AN-D8m, May 16, 2001, pp. 1-4.
Acouster, Zetex, “50W Class D Audio Amplifier Evaluation Board”, ZXCD50STEVAL, Issue 1, Jul. 2002, pp. 1-12.
Beyer Weaver & Thomas LLP
Nguyen Patricia
Tripath Technology Inc.
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