Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2006-05-23
2006-05-23
Choe, Henry (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S251000
Reexamination Certificate
active
07049885
ABSTRACT:
A digital amplifier causes a gate drive circuit to drive output transistors, and switches a power source voltage supplied from a variable voltage power source, thereby amplifying an amplitude of a 1-bit digital signal outputted from a ΔΣ block. A variable voltage power source varies a driving voltage, by which an upper gate drive circuit drives output transistors, as a voltage obtained by adding (i) a constant voltage supplied to a lower gate drive circuit to (ii) a power source voltage, so as to correspond to the power source voltage. Thus, the driving voltage is minimized without influencing a switching operation of the output transistors. As a result, it is possible to reduce power consumption of the upper gate drive circuit in turning down the volume.
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Birch & Stewart Kolasch & Birch, LLP
Choe Henry
Sharp Kabushiki Kaisha
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