| 摘要 |
PURPOSE:To suppress the increase of power consumption, by providing a gate circuit which controls the output of a comparator between the comparator having the cancel function of an offset voltage, and a MOS logic circuit. CONSTITUTION:A comparator 6 is constituted of switched capacitors 1-4, and an operational amplifier, and has the cancel function of an offset voltage VOFF. A NOR gate 23 is provided between the output 9 of the circuit 6, and a CMOS logic circuit 13. The terminal 26 of the gate 23 is controlled at a level '0' at the time of performing no offset cancel function by the circuit 6. Thereby, the inversion level of the output 9 of the circuit 6 is outputted to the output terminal 25 of the gate 23, and it is inputted as it is to the circuit 13. Since a transistor Tr15 is turned off by controlling the terminal 26 at a level '1' while executing the offset cancel function, no through current is permitted to flow through the circuit 23 itself, and a Tr18 is energized, then the terminal 25 is set at the level '0l compulsorily. Therefore, no through current is permitted to flow from the circuit 6 to the circuit 13 by the action of the circuit 23, thereby, it is possible to reduce the power consumption.
|
