Ultrasonic fingerprint detection device and electronic device

An electronic device, comprising:

• a cover plate, and
• an ultrasonic fingerprint detection device, comprising:
• a signal generation circuit and an ultrasonic fingerprint sensor chip,
• wherein the signal generation circuit is composed of discrete devices and the signal generation circuit comprises:
• a control circuit and a resonant circuit, the control circuit is configured to receive a control signal provided by the ultrasonic fingerprint sensor chip and generate an excitation signal under the action of the control signal, and the resonant circuit is configured to receive the excitation signal and form a drive signal under the action of the excitation signal;
• wherein the ultrasonic fingerprint sensor chip is configured to receive the drive signal, and generate an ultrasonic signal for fingerprint detection under the action of the drive signal;
• wherein the signal generation circuit further comprises:
• a brake circuit, one end of the brake circuit is connected between the control circuit and the resonant circuit, and the other end of the brake circuit is grounded, the brake circuit is used to absorb redundant signal energy generated by the resonant circuit when the resonant circuit stops outputting the drive signal;
• and
• wherein the cover plate is configured to receive pressing of a user finger, and the ultrasonic fingerprint detection device is disposed under the cover plate to detect a fingerprint of the user finger pressed against the cover plate.