Patent ID: 8797789

Claim:
A sense amplifier, comprising: a first transistor, a second transistor, a third transistor, a fourth transistor, a tail current transistor and an output stage: wherein, gate of the second transistor and gate of the fourth transistor are connected to two inputs of the sense amplifier respectively, gate of the third transistor, drains of the first transistor and the second transistor are connected at a second node, gate of the first transistor, drains of the third transistor and the fourth transistor are connected at a first node, sources of the first transistor and the third transistor are connected to an power supply level, sources of the second transistor and the fourth transistor are connected to drain of the tail current transistor, gate of the tail current transistor is connected to a sense amplifier enabling signal, source of the tail current transistor is connected to a negative level, and the first node and the second node are connected to the output stage respectively, wherein the negative level is supplied from a negative voltage output node of a bootstrap circuit.