Sense amplifier and method thereof

A sense amplifier, comprising:

• a first stacked circuit of first, second, and third transistors coupled between first and second power supply terminals, wherein:
• the first transistor includes a source terminal coupled to the first power supply terminal and a gate terminal coupled to a first input terminal for receiving a first input signal;
• the second transistor is coupled between the first transistor and the third transistor;
• and
• the third transistor is coupled between the second transistor and the second power supply terminal;
• a second stacked circuit of fourth, fifth, and sixth transistors coupled between the first and second power supply terminals, wherein:
• the fourth transistor includes a source terminal coupled to the first power terminal and a gate terminal coupled to a second input terminal for receiving a second input signal;
• the fifth transistor is coupled between the fourth transistor and the sixth transistor;
• and
• the sixth transistor is coupled between the fifth transistor and the second power supply terminal;
• and
• an output circuit, coupled to the first and second stacked circuits, having an output terminal, and comprising third, fourth, fifth, and sixth stacked circuits each having three transistors, the third and fourth stacked circuits sharing a seventh stacked circuit of two transistors, the fifth and sixth stacked circuits sharing an eighth stacked circuit of two transistors.

A method for sensing a signal voltage, comprising:

• receiving a power supply voltage at source terminals of a first pair of transistors;
• receiving first and second input signals respectively at gate terminals of the first pair of transistors;
• turning off a second pair of transistors based on a first clock signal to isolate the first pair of transistors from an output circuit;
• generating first and second differential signals based on the first and second input signals and the first clock signal;
• generating an output signal based on the first and second differential signals and a second clock signal, the second clock signal having a phase shift from the first clock signal.