Patent ID: 7327621

Claim:
A program cell current sensing circuit for a sensing amplifier, comprising: a first transistor having a first source/drain grounded, and a gate electrically coupled to a first control signal; a program memory cell providing a program current to a second source/drain of the first transistor based on a second control signal; a second transistor having a first source/drain grounded, and a gate electrically coupled to the inverse first control signal; a third transistor having a gate and a first source/drain electrically coupled to the second source/drain of the first transistor and the second transistor, respectively; and a fourth transistor having a gate electrically coupled to the inverse first control signal, a first source/drain electrically coupled to a second source/drain of the third transistor, and a second source/drain of the fourth transistor electrically coupled to a DC bias, wherein, the electrical characteristic of the fourth transistor is opposite to the electrical characteristic of the first transistor, the second transistor and the third transistor.