Patent ID: 9685203
Date: 2017-06-20
CPC Classifications: G11C,H01L,H03K

Claim:
1. A power supply voltage switching circuit comprising: a power selecting module configured to receive a first supply signal and a second supply signal, and output an intermediate supply signal according to the first supply signal and the second supply signal; a level shifting module coupled to the power selecting module for receiving the intermediate supply signal as a power supply of the level shifting module, and configured to receive a first control signal and a second control signal, and generate a first shifted signal and a second shifted signal by shifting voltage levels of the first control signal and the second control signal respectively; and a supply switching module comprising: wherein: the first supply signal has a voltage between a first voltage and a second voltage; the second supply signal has a voltage between the first voltage and a third voltage; the third supply signal has a voltage between the first voltage and a fourth voltage; the second voltage is greater than the third voltage; the third voltage is greater than the fourth voltage; and the fourth voltage is greater than the first voltage.