Ultrasonic transceiver system and electronic device

An electronic device, comprising:

• a cover plate, and
• an ultrasonic transceiver system;
• wherein the cover plate is configured to receive a press by a user's finger, and the ultrasonic transceiver system is arranged under the cover plate, to detect a fingerprint pressed on the cover plate by the user's finger;
• wherein the ultrasonic transceiver system comprises:
• a signal generating circuit and an ultrasonic sensor chip;
• the signal generating circuit is composed of discrete devices and comprises:
• a pulse generating circuit and a resonant circuit;
• the pulse generating circuit is configured to receive a control signal output by the ultrasonic sensor chip, and generate, according to the control signal, a first pulse voltage signal and a second pulse voltage signal which are in opposite phase to each other;
• and the resonant circuit is configured to receive the first pulse voltage signal and the second pulse voltage signal which are in opposite phase to each other, and generate a drive signal according to the first pulse voltage signal and the second pulse voltage signal which are in opposite phase to each other;
• and
• the ultrasonic sensor chip is configured to receive the drive signal and generate an ultrasonic signal according to the drive signal;
• wherein the resonant circuit comprises a resonant inductor and a resonant capacitor;
• one end of the resonant inductance is connected to a first pulse output end of the pulse generating circuit;
• the other end of the resonant inductance, one end of the resonant capacitor and an input end of the ultrasonic sensor chip are connected;
• and the first pulse output end is configured to output the first pulse voltage signal;
• and
• the other end of the resonant capacitor is connected to a second pulse output end of the pulse generating circuit, and the second pulse output end is configured to output the second pulse voltage signal;
• wherein the resonant inductor and the resonant capacitor resonate under action of the first pulse voltage signal and the second pulse voltage signal, to generate a sine wave drive signal;
• wherein the pulse generating circuit comprises a first half-bridge circuit, a second half-bridge circuit, a first inverter and a second inverter;
• an input end of the first half-bridge circuit is connected to a first output end and a second output end of the ultrasonic sensor chip, and an output end of the first half-bridge circuit is the first pulse output end of the pulse generating circuit;
• an input end of the second half-bridge circuit is connected to an output end of the first inverter and an output end of the second inverter, and an output end of the second half-bridge circuit is the second pulse output end of the pulse generating circuit;
• and
• an input end of the first inverter is connected to the first output end of the ultrasonic sensor chip, and an input end of the second inverter is connected to the second output end of the ultrasonic sensor chip.