Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2006-02-09
2008-05-13
Mottola, Steven J. (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S251000
Reexamination Certificate
active
07372324
ABSTRACT:
Switching circuits constituted by FETs are inserted between power supplies +VB and −VB and a speaker serving as a load respectively, and switched on/off by a pulse train so as to drive the speaker. A pulse generation circuit is a circuit by which a pulse train subjected to pulse width modulation in accordance with an input signal is supplied to the switching circuits. The pulse generation circuit can control the amplitude of the pulse train in accordance with a control signal. Filters limit specific frequency band components in a power supply voltage waveform between the power supplies, and supply the power supply voltage waveform to a gain control circuit in the pulse generation circuit as the control signal.
REFERENCES:
patent: 5898340 (1999-04-01), Chatterjee et al.
patent: 2004007324 (2004-01-01), None
Mottola Steven J.
Pillsbury Winthrop Shaw & Pittman LLP
Yamaha Corporation
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