DEVICE AND METHOD FOR LOADED DRIVING

摘要

PROBLEM TO BE SOLVED: To provide a device and a method for loaded driving that reduces an output offset voltage of the whole system and make respective element sizes small. SOLUTION: The loaded driving device has: an input amplifier which inputs a driving signal and a reference signal and differentially amplifies them; a triangular wave generation section; a pulse-width modulation section which modules the output signal of the input amplifier into a modulated signal; a driving output circuit based upon the pulse-width modulated signal; and a feedback amplifier which amplifies and feeds the driving output circuit signal back to the input amplifier. The device further includes: an offset adjustment signal addition section which adds an offset correction voltage and outputs the result to an input terminal of the input amplifier; an input amplifier input signal setting section for substantially holding the two driving signal and reference signal at substantially the same potential with a specified signal; and an input amplifier offset decision section which decides whether the output signal of the input amplifier is nearly zero with a specified signal. COPYRIGHT: (C)2006,JPO&NCIPI