Transistor voltage threshold mismatch compensated sense amplifiers and methods for precharging sense amplifiers

摘要

Sense amplifiers and methods for precharging are disclosed, including a sense amplifier having a pair of cross-coupled complementary transistor inverters, and a pair of transistors, each one of the pair of transistors coupled to a respective one of the complementary transistor inverters and a voltage. The sense amplifier further includes a capacitance coupled between the pair of transistors. One method for precharging includes coupling input nodes of the sense amplifier to a precharge voltage, coupling the input nodes of the sense amplifier together, and coupling a resistance to each transistor of a cross-coupled pair to set a voltage threshold (VT) mismatch compensation voltage for each transistor. The voltage difference between the VT mismatch compensation voltage of each transistor is stored.

主权项

1. An apparatus, comprising:
first and second field-effect transistors (FETs), the first and second FETs having a respective drain configured to receive a respective input signal; and a capacitance coupled between sources of the first and second FETs, the capacitance configured to store a voltage difference between the sources of the first and second FETs to compensate for threshold voltage differences between the first and second FETs; and third and fourth FETs, the third FET coupled to the drain of the first FET and the fourth FET coupled to the drain of the second FET, wherein an equilibration signal is applied to a gate of the third FET and a gate of the Fourth FET.