×

Method and apparatus for use in improving linearity of MOSFETs using an accumulated charge sink

  • US 10,622,990 B2
  • Filed: 08/03/2018
  • Issued: 04/14/2020
  • Est. Priority Date: 07/11/2005
  • Status: Active Grant
First Claim
Patent Images

1. An RF switch circuit for switching RF signals, comprising:

  • (A) a first RF port;

    (B) a second RF port; and

    (C) a pass transistor grouping having a first node coupled to the first RF port and a second node coupled to the second RF port, the pass transistor grouping comprising a first two or more accumulated charge control N-type MOSFETs (ACC N-MOSFETs) arranged in a stacked configuration; and

    wherein;

    (a) each ACC N-MOSFET of the first two or more ACC N-MOSFETs comprises;

    (i) a first gate, a first drain, a first source, a first gate oxide layer, and a first body, wherein the first gate oxide layer is positioned between the first gate and the first body; and

    (ii) a first accumulated charge sink (ACS) region connected to the first body;

    (b) the pass transistor grouping configured to couple the first RF port with the second RF port in a pass transistor grouping first state;

    (c) the pass transistor grouping configured to isolate the first RF port from the second RF port in a pass transistor grouping second state, and wherein the pass transistor grouping is configured to have a first bias voltage applied to the first ACS region to remove or otherwise control, via the first ACS region, charge that, without the first bias voltage applied, would accumulate in the first body in the pass transistor grouping second state; and

    (d) the first bias voltage being substantially negative with respect to ground, the first drain and the first source.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×