Fingerprint sensing chip and terminal device

A fingerprint sensing chip, comprising:

• a first signal,
• a second signal, and
• a driving signal,
• wherein the second signal is generated based on the first signal, and the driving signal is generated by performing a ground raise process on the second signal;
• and
• the driving signal is used to provide a driving voltage for fingerprint sensing;
• wherein:
• the fingerprint chip further comprises a third signal;
• the driving signal is obtained by performing a positive ground raise process on the second signal;
• a voltage of the third signal ranges from 0 to a first positive voltage;
• a voltage of the first signal ranges from 0 to a second positive voltage;
• a voltage of the second signal ranges from 0 to a third positive voltage;
• the third signal, the second signal, the driving signal and the first signal share a P-type substrate;
• and the P-type substrate is connected to ground GND of the fingerprint sensing chip;
• the third signal is a low potential signal generated by a buck circuit in the fingerprint sensing chip;
• and
• the second signal is generated by a booster circuit based on the first signal.