| 摘要 |
PURPOSE: A circuit for blocking leakage current in a current sense amplifier is provided in which an NMOS transistor is serially connected to a transistor generating leakage current to prevent leakage current from flowing in standby state. CONSTITUTION: Input/output ports(I/O,I/O') are connected to the gates of pull-up NMOS transistors(N1,N2) whose sources are coupled to a power supply and to the sources of sense amplifier transistors(SA,SA'). A current control transistor(N3) is coupled between the drains of the sense amplifier transistors. The drains of the pull-up NMOS transistors are respectively connected to the sources and gates of diode transistors(D1,D2). The drains of the diode transistors are connected to the sources of current blocking transistors(Mn3,Mn4) whose drains are coupled to the ground. The drains of the sense amplifiers are connected to the sources of differential amplification transistors(Mn1,Mn2), and the gates of the diode transistors are coupled to the gates of the differential amplification transistors in common. The drains of the differential amplification transistors are coupled to the source of an enable transistor(N4). The gates of the current control transistor, enable transistor and current blocking transistor are commonly connected to an enable signal input port(Pact).
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