Fingerprint sensor and electronic terminal

A fingerprint sensor and an electronic terminal are provided. The fingerprint sensor includes: a fingerprint sensor chip and a floating ground control circuit. The fingerprint sensor chip includes a sensor array including a plurality of sensing electrodes and a driver. The sensing electrode in the sensor array is configured to form a fingerprint capacitor with a finger. The driver is configured to output a driving signal to the floating ground control circuit. The fingerprint sensor chip includes a sensor power supply end and a sensor ground. The sensor power supply end and the sensor ground are connected to the floating ground control circuit and are respectively configured to receive a high potential and a low potential output by the floating ground control circuit. The output high potential and low potential substantially synchronously vary to maintain a substantially constant voltage which is supplied to the fingerprint sensor chip.