Patent ID: 7605614

Claim:
A current switch logic circuit, comprising: a current sense amplifier, comprising: a first transistor, having a gate, a first source/drain and a second source/drain, wherein the first source/drain is coupled to a first voltage, the gate is coupled to a first output terminal, and the second source/drain is coupled to a second output terminal; a second transistor, having a gate, a first source/drain and a second source/drain, wherein the first source/drain is coupled to the first voltage, the gate is coupled to the second output terminal, and the second source/drain is coupled to the first output terminal; a third transistor, having a gate, a first source/drain and a second source/drain, wherein the first source/drain is coupled to the second output terminal, the gate is coupled to one of a pre-charge enable terminal and the first output terminal; and a fourth transistor, having a gate, a first source/drain and a second source/drain, wherein the first source/drain is coupled to the first output terminal, the gate is coupled to one of a pre-charge enable terminal and the second output terminal; and a logic tree, coupled between the second source/drain of the third transistor and the second source/drain of the fourth transistor, and having a first control terminal and a second control terminal, wherein the second control terminal is coupled to one of the pre-charge enable terminal and the first output terminal, and the first control terminal is coupled to one of the pre-charge enable terminal and the second output terminal.