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Low-power wide-swing sense amplifier with dynamic output stage biasing

  • US 10,211,782 B1
  • Filed: 10/16/2017
  • Issued: 02/19/2019
  • Est. Priority Date: 10/16/2017
  • Status: Active Grant
First Claim
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1. A sense amplifier, comprising:

  • a p-channel metal-oxide semiconductor (PMOS) differential pair of transistors configured to respond to a differential input voltage;

    an n-channel metal-oxide semiconductor (NMOS) differential pair of transistors configured to respond to the differential input voltage;

    an output stage including a PMOS output transistor and an NMOS output transistor;

    a first current differential amplifier configured to sink a first difference current proportional to a difference between a first current for a first NMOS transistor in the NMOS differential pair of transistors and a second current for a second NMOS transistor in the NMOS differential pair of transistors to discharge a gate voltage for the PMOS output transistor;

    a biasing network configured to discharge the gate voltage for the NMOS output transistor responsive to a sum of the first current and a third current in a first PMOS transistor in the PMOS differential pair of transistors;

    a first NMOS switch transistor anda second NMOS switch transistor wherein the differential input voltage is coupled across a pair of gates for the first NMOS switch transistor and the second NMOS switch transistor, and wherein the first NMOS switch transistor and the second NMOS switch transistor are coupled in parallel between the first current differential amplifier and the gate of the PMOS output transistor.

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