| 摘要 |
PURPOSE:To lessen multipliers and thereby to remove the effect of a frequency of a power source and to prevent lowering of a voltage level by a method wherein a time-division multiplication signal of a load voltage and a consumption current is taken in with a pulse proportional to the frequency and integrated. CONSTITUTION:A sampling circuit 13 is constructed of an analog switch 13s and of a resistance 13r and a capacitor 13c constituting an integration circuit. While an output signal from a multiplier 9 is inputted to the circuit 13, the switch 13s is driven by a pulse signal having a prescribed pulse width being proportional to a frequency from a one-shot circuit 11, so as to form a pulse signal, and this signal is taken in through the switch 13s. Next, the pulse signal is integrated by the integration circuit constituted of the resistance 13r and the capacitor 13c, so as to obtain an output signal. The output signal in this case is not affected by an input frequency and thus lowering of a voltage level is prevented. Therefore characteristics are improved and also it is possible to lessen the number of components and to improve economics and reliability. |
