Semiconductor device

A semiconductor device comprising:

• a secondary battery configured to be charged by wireless communication through a first circuit, the first circuit configured to rectify a signal input by the wireless communication;
• a second circuit electrically connected to the secondary battery, the second circuit comprising a transistor, the transistor comprising a channel formation region comprising an oxide semiconductor;
• a third circuit comprising a plurality of n-channel transistors;
• a fourth circuit electrically connected to the second circuit;
• wherein a first signal is input to the fourth circuit from the second circuit,
• wherein a second signal is input to the transistor from the fourth circuit, and
• wherein the transistor is provided between the first and the third circuits.

A semiconductor device comprising:

• a secondary battery configured to be charged by wireless communication through a first circuit, the first circuit configured to rectify a signal input by the wireless communication;
• a second circuit electrically connected to the secondary battery, the second circuit comprising a transistor, the transistor comprising a channel formation region comprising an oxide semiconductor;
• a third circuit comprising a logic gate;
• a fourth circuit electrically connected to the second circuit;
• wherein a first signal is input to the fourth circuit from the second circuit,
• wherein a second signal is input to the transistor from the fourth circuit, and
• wherein the transistor is provided between the first and the third circuits.