System, apparatus, and method for sense amplifiers

摘要

An offset cancelling sense amplifier according to some examples of the disclosure may use a double sensing margin structure and positive feedback to achieve better performance characteristics and read stability without a multistage operation. For example, a sense amplifier may include a second pair of sensing switches cross coupled in parallel with a first pair of sensing switches and a pair of degeneration transistors coupled in line before a pair of load transistors.

主权项

1. A sense amplifier circuit for improving sensing margin and speed, comprising:
a pair of degeneration transistors, a gate of each of the pair of degeneration transistors being selectively coupled to a ground and a supply voltage; a pair of load transistors coupled to the pair of degeneration transistors; a pair of capacitors, each of the pair of capacitors being coupled to a drain of one of the pair of load transistors and a gate of the other of the pair of load transistors; a first pair of sensing switches, each of the first pair of sensing switches being coupled to the gate of one of the pair of load transistors and the drain of a same one of the pair of load transistors; a second pair of sensing switches, each of the second pair of sensing switches being coupled to the drain of one of the pair of load transistors; and a third pair of sensing switches configured in parallel with the second pair of sensing switches, each of the third pair of sensing switches being coupled to the drain of one of the pair of load transistors and cross coupled below an opposite one of the second pair of sensing switches.