POWER SWITCHING CIRCUIT, SEMICONDUCTOR INTEGRATED CIRCUIT, RADIO APPARATUS, RADIO SYSTEM, AND POWER SWITCHING METHOD

摘要

A power switching circuit includes a current mirror circuit to generate mirror currents, by transferring, at different mirror ratios, monitored currents that are obtained by monitoring power supply voltages, a selector to select the mirror currents with a combination having the different mirror ratios for the monitored currents, according to a switching state of the power supply voltages, a comparator to compare the mirror currents selected by the selector and output a comparison result, and a switching circuit to switch a supply voltage to be supplied to a load to one of the power supply voltages, based on the comparison result.

主权项

1. A power switching circuit comprising:
a current mirror circuit configured to generate a plurality of mirror currents, by transferring, at different mirror ratios, a plurality of monitored currents that are obtained by monitoring a plurality of power supply voltages; a selector configured to select the plurality of mirror currents with a combination having the different mirror ratios for the plurality of monitored currents, according to a switching state of the plurality of power supply voltages; a comparator configured to compare the plurality of mirror currents selected by the selector, and output a comparison result; and a switching circuit configured to switch a supply voltage to be supplied to a load to one of the plurality of power supply voltages, based on the comparison result.