Patent ID: 6456549
Filing Date: 2002-09-24
Classification: G11C

Abstract:
A sense amplifier circuit, comprising:a first input that receives a voltage generated in response to a current flowing on a digit line; a second input that receives a reference voltage; a latching circuit that latches a voltage difference at first and second amplifier nodes when enabled by an active control signal; a first transfer switch that couples the first input to the first amplifier node when the control signal is inactive and isolates the first input from the first amplifier node when the control signal is active, the first transfer switch comprising a first transistor having a controllable impedance path between the first input and first amplifier node and a first control terminal that receives the control signal and a second transistor having a second control terminal that receives a complementary control signal; and a second transfer switch that couples the second input to the second amplifier node when the control signal is inactive and isolates the second input from the second amplifier node when the control signal is active, the first transfer switch comprising a third transistor having a controllable impedance path between the second input and second amplifier node and a third control terminal that receives the control signal.