POWER SOURCE SELECTION CIRCUIT, SIGNAL PROCESSING CIRCUIT EMPLOYING THE SAME, AND ELECTRONIC APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a power source selection circuit capable of selecting a power supply voltage of an appropriate channel.SOLUTION: Each of a plurality of clamp circuits 10 clamps a respectively corresponding power supply voltage Vequal to or lower than a predetermined clamp voltage V. Each of a plurality of first switches SW1 is provided in parallel with the corresponding clamp circuit 10. Each of a plurality of second switches SW2 is provided between an output terminal of the corresponding clamp circuit 10 and an internal bus 20. Each of a plurality of voltage determination devices 30 determines a voltage level of the corresponding power supply voltage V. A controller 40 priorities a plurality of channels CH and controls the plurality of first switches SW1 and the plurality of second switches SW2 on the basis of the priorities and output from the plurality of voltage determination devices 30.