| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital amplifier which reduces variation in the output level caused by variation in a power supply voltage using a simple configuration. SOLUTION: The amplifier is configured so as to amplify an input signal by switching a constant voltage based on a pulse signal obtained by pulse width modulation orΔ-Σmodulation of the input signal. The amplifier comprises an analog/digital converter 6 for converting the constant voltage to digital pulse, a means 5 of obtaining a difference between the voltage value converted to digital pulse by the analog/digital converter and a predetermined voltage value, and adding means 5 and 7 for adding a voltage corresponding to the obtained difference to an input signal. The configuration is to correct an error of the voltage value obtained by amplifying the input signal caused by the difference. COPYRIGHT: (C)2006,JPO&NCIPI
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