| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a peak hold circuit which operates stably even if the peak voltage, to be kept, of motor drive current detected voltage is minute. <P>SOLUTION: This peak hold circuit 14 is equipped with a level shift circuit 50 which shifts the motor drive current detected voltage by fixed voltage, a differential amplifying circuit 60 which receives the input of the output voltage of the level shift circuit 50 and the voltage of an output terminal OUT and amplifies the difference between them prior to output, an output transistor 81 which receives the input of the output voltage of the differential amplifying circuit 60 with its base and emits a charge current from its emitter, a capacitor 82 which is charged with a charge current and keeps the voltage of the output terminal OUT, a bias element 84 which generates voltage substantially equal to the fixed voltage of the level shift circuit 50, and a resistive element 83 which is provided between the bias element 84 and the output terminal OUT and controls the charge current of the capacitor 82. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
