Tablet

A tablet that supplies energy to a stylus including a resonant circuit including a coil and a capacitor by using an alternating magnetic field, the tablet comprising:

• a sensor coil group including a plurality of sensor coils;
• a switch connected to the sensor coil group;
• a receiver which, in operation, receives a pen signal that is transmitted by the stylus and provided to the sensor coil group through the switch;
• a transmitter which, in operation, generates the alternating magnetic field by supplying a signal to the sensor coil group through the switch;
• and
• a control circuit which, in operation, supplies a transmission signal to the transmitter and receives input of the pen signal from the receiver, wherein:
• the transmitter includes an amplifying circuit which, in operation, supplies the sensor coil group with a voltage-amplified signal obtained by amplifying the transmission signal supplied from the control circuit in such a manner that a maximum amplitude falls within a rated voltage of the switch, and
• the control circuit, in operation, performs a first control operation that controls the switch to cause one of the plurality of sensor coils to be connected to the receiver and a second control operation that controls the switch to cause at least one predetermined sensor coil of the plurality of sensor coils to be connected to the transmitter.