Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2007-04-17
2007-04-17
Lee, Benny T. (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S298000, C330S20700P
Reexamination Certificate
active
10521725
ABSTRACT:
In a power amplifier driven by a pulse width modulation (PWM) signal, a first pair of drive pulses opposite in level to each other is formed from a first pulse width modulation signal whose quantization level corresponds to its pulse width and supplied to a first push-pull circuit (15). A second pair of drive pulses opposite in level to each other is formed from a second pulse width modulation signal whose two's complement of quantization level corresponds to its pulse width, and supplied to a second push-pull circuit (16). A speaker (19) is connected between the first and second push-pull circuits (15and16). A deviation between potentials at the output terminals of the first and second push-pull circuits (15and16), respectively, is detected. When a deviation is detected, the push-pull circuits are substantially stopped from operating.
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Flanagan Krista
Lee Benny T.
Sony Corporation
Wolf Greenfield & Sacks P.C.
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